EP0195384A1 - Supply circuit for a light emitter which changes colour - Google Patents

Supply circuit for a light emitter which changes colour Download PDF

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Publication number
EP0195384A1
EP0195384A1 EP86103471A EP86103471A EP0195384A1 EP 0195384 A1 EP0195384 A1 EP 0195384A1 EP 86103471 A EP86103471 A EP 86103471A EP 86103471 A EP86103471 A EP 86103471A EP 0195384 A1 EP0195384 A1 EP 0195384A1
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EP
European Patent Office
Prior art keywords
signal
counter
light sources
outputs
output
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Granted
Application number
EP86103471A
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German (de)
French (fr)
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EP0195384B1 (en
Inventor
Werner Schneiter
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Omega Electronics SA
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Omega Electronics SA
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/09Circuit arrangements or apparatus for operating incandescent light sources in which the lamp is fed by pulses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00Lighting devices or systems producing a varying lighting effect
    • F21S10/02Lighting devices or systems producing a varying lighting effect changing colors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0004Personal or domestic articles
    • F21V33/0052Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
    • F21V33/0056Audio equipment, e.g. music instruments, radios or speakers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00Illumination
    • Y10S362/806Ornamental or decorative
    • Y10S362/811Psychedelic lighting

Definitions

  • the present invention relates to a device for supplying a light emitting element equipped with at least two light sources each radiating a different fundamental color, the tint emitted by said element changing color as a function of variations in a analog electrical signal supplied by a physical phenomenon sensor, in particular a microphone.
  • Document FR-A-2 186 624 proposes a set of three light sources of different colors combined with a reflector ensuring the mixing of these colors.
  • a strip of paper with three tracks is used, the transparency of which varies according to the illumination to be provided at each instant by each light source. The transparency is measured by photoelectric cells so that when the strip passes, the resulting shade emitted by the reflector varies.
  • Document US Pat. No. 3,564,332 describes a system very similar to that which has just been mentioned, where the color change control element is in the form of a continuously rotating disc.
  • the present invention is characterized in that the device for supplying light sources comprises a converter capable of converting the analog signal supplied by a sensor, in particular a microphone, into a series of electrical pulses whose rising or falling edges follow one another at a rate which is dependent on the variations of said analog signal and a counter using the rising or falling edges of each of said pulses to provide at its output a coded signal whose state changes each time one of said rising or falling edges is applied to said counter, each of said states of said coded signal determining a predetermined state of excitation of said light sources.
  • an important aim which the present invention proposes to achieve is to make the ignition of light sources depend not on the frequency or on the level of an analog signal, such as that coming from a microphone for example, but on a coded signal which changes according to the variations of this signal. Each change of state of the coded signal corresponds to a different excitation of the light sources and this according to a determined sequence which is repeated.
  • Another object which the invention proposes to achieve is to implement a code converter whose role consists, for a determined sequence, in increasing the number of possible states that the coded signal can take in this sequence.
  • Figure 1 shows a light emitting element equipped with three light sources referenced B (blue), G (green) and R (red).
  • the color emitted by this element will change color to function of variations in an analog electrical signal supplied by a physical phenomenon sensor, here a microphone 1.
  • a microphone 1 As the voltage collected across the microphone is low, it is amplified by amplifier 2 at the output of which there is a signal 8 of sufficient amplitude to attack the device according to the invention.
  • This device firstly comprises a converter 3 which transforms the analog signal 8 into a series of pulses 9 whose rising sides 6 and falling 7 follow one another at a rate which is dependent on variations in the analog signal 8.
  • the power supply device also comprises a counter 4 which uses the rising or falling edges (here preferably the rising edges 6) of each of said pulses 9 to provide at its output a coded signal 10 whose state changes each time it is applied at the counter 4 one of the rising or falling sides of the pulses 9.
  • a coded signal 10 whose state changes each time it is applied at the counter 4 one of the rising or falling sides of the pulses 9.
  • Each of the successive states occurring at the output of the counter 4 determines a determined state of excitation of the light sources.
  • the state 1 0 1 of the signal 10 excites the lamps B and R while the lamp G remains off. If B and R radiate a blue and red color respectively, the tint of the light emitting element 5 will be purple.
  • FIG. 2 is a detailed diagram of the supply device, the principle diagram of which has been explained above and according to a first embodiment. Here we find the different elements 1, 2, 3, 4 and 5 exposed in Figure 1 and which will now be explained in detail.
  • the physical phenomenon sensor 1 makes it possible to correspond to the amplitude of a physical quantity a determined shade.
  • the quantity in question is an acoustic or musical signal picked up by a microphone. It could however be another quantity, for example the angle of rotation of an axis, the displacement of a control handle, a temperature, etc.
  • the microphone used is preferably of the electret type with its own preamplifier.
  • the electrical signals from the microphone 1 are then applied to an amplifier 2 which comprises two operational amplifiers 12 and 13 connected in cascade.
  • a potentiometer 14 makes it possible to adjust the gain of amplifier 2.
  • Block 2 is supplied with DC voltage, like blocks 1, 3 and 4 moreover, by a source not shown and by means of the lines marked +.
  • An analog signal having the appearance of that referenced 8 in FIG. 1 is collected at the output 15 of the amplifier 2.
  • the signal present on line 15 is then applied to converter 3 whose purpose is to convert said signal into a series of electrical pulses appearing on the output line 24 of said converter.
  • this conversion is done as follows:
  • the analog signal is rid of its negative half-wave.
  • the remaining positive half-cycle is shown under reference 17 in FIG. 3a.
  • the signal thus rectified is then applied to an integrator formed by the capacitor 18 and the resistor 19, which results in the formation, at point 20, of a new signal which is the envelope of the rectified analog signal as can be see at 21 in Figure 3a.
  • the envelope signal 21 is applied to an operational amplifier 22 operating as a comparator.
  • the signal 21 is compared in this comparator to a voltage threshold which is referenced 23 in FIG.
  • the pulses of FIG. 3b are then applied to the counter 4 on its input Cl (clock) after having passed through the inverter 25.
  • the counter 4 changes state each time a rising edge is applied to its input Cl while it is insensitive to the falling edge of the control pulses.
  • On the outputs Q 1 , Q 2 and Q 3 of the counter there are the successive situations given by the following table which also gives the sequence of lighting of the light sources R, G, B as and when the flanks appear amounts at the Cl input of the counter:
  • FIG. 3a shows that the choice value of the voltage threshold 23 is critical. If the musical level is very high, it will remain above this threshold and there will be little or no change in color. Conversely, in the case of a low musical level, the envelope signal could be confined below the threshold 23.
  • an amplifier 2 could be used which would be equipped with automatic gain control (AGC). instead of the manual control provided by element 14.
  • AGC automatic gain control
  • FIG. 4 represents a modified converter 3, all the other blocks being similar to those discussed in connection of Figure 2.
  • the converter 3 of Figure 4 includes a differentiator disposed between the integrator 18, 19 and the comparator 22.
  • This differentiator includes the capacitor 33 and the two resistors 34 and 35.
  • the envelope signal present at point 20 is applied to capacitor 33 of the differentiator.
  • the aim of this system is first of all to bring the envelope signal to center around a zero level and then, if the value of the capacitor 33 is chosen to be low enough with respect to the resistors 34 and 35, to cause the comparator on the slope of the envelope signal.
  • FIG. 5a shows the appearance of the differentiated signal such that it appears after the capacitor 33 and as it is applied to the comparator 22.
  • the differentiated signal is compared to the threshold voltage 36, which produces at the output of the comparator the series of pulses which appears in FIG. 5c.
  • the rising edges 6 of the signal change the state of the counter 4, which produces a sequence of tones consecutive to the various successive states taken by the outputs Q 1 Q 2 Q 3 of the counter 4.
  • Figure 6 is a partial diagram of the supply device according to a third embodiment.
  • the outputs Q 1 , Q 2 and Q 3 of the counter 4 are connected to a NAND gate 38 and, on the other hand, the same three outputs are connected to the switches 28, 27 and 26 by through doors 39, 40 and 41 respectively.
  • the output of gate 38 is connected to the LOAD input of the counter, that the input P 1 is connected to the most of the power supply while the inputs P 2 and P 3 are connected to ground.
  • the purpose of this combination is to prevent the state 0 0 0 at the output of the counter.
  • a signal 0 arises at the output of the said door, which has the consequence of preselecting the counter according to the state imposed on the inputs P 1 , P 2 and P 3 when the next rising edge Cl arrives.
  • the preselection will be made on the value 100.
  • the state 0 0 0 which is between state 1 1 1 and 1 0 0 (as we can see on the table given above) is deleted.
  • the purpose of this programming is to avoid a black state in the sequence which is then reduced to 7 different states.
  • door means are arranged between the outputs Q 1 , Q 2 and Q 3 of the meter and the light sources.
  • the purpose of this arrangement is to prevent for a predetermined period of time the application of the coded signal to the light sources during each change of state of this signal. It has indeed been noticed that a very short pause (black pause) between the change from one color to another gives a more marked impression of this change than if the change was made without a break.
  • the gates 39, 40 and 41 receive on their first inputs the signals Q 1 , Q 2 and Q 3 respectively and on their second inputs put in parallel a signal 42 which is the differentiation of the falling edge of the control pulse arriving by the line 24.
  • the differentiation is carried out by the RC constituted by the capacitor 43 and the resistor 44.
  • the elements 43 and 44 will be dimensioned so as to preferably obtain a pause before ignition on the order of 50 to 100 ms.
  • FIG. 7 is a partial diagram of the supply device according to a fourth embodiment according to the invention.
  • the code converter 45 used is of the programmable memory type generally called PROM.
  • the code converter can be programmed at will and an example has just been given in the table above. We note in particular that the state 0 0 0 0 no longer needs to be deleted since it corresponds in the example given to a color, in particular white (W) result of the simultaneous excitation of the three RGB colors .
  • the arrangement taken in FIG. 6 to prevent for a short period of time the application of the coded signal to the RGB light sources is also implemented in the embodiment of FIG. 7.
  • the way of performing this function is however simplified by the fact that the PROM 45 converter has a single CE input. After having been differentiated by the capacitor 47 and the resistor 48, then reversed by the gate 49, the falling edge of the pulses present on the line 24 controls the input CE of the memory 45.
  • the RGB light sources shown in the various figures may be of the incandescent type, each having a different colored bulb.
  • the supply of these lamps is made by a DC voltage source of value + U if the switches 26, 27 and 28 are simple transistors. If this voltage were to be an alternative source, a diac-triac system which is also well known in the state of the art will be used as the semiconductor switch.
  • These light sources could also be fluorescent tubes, the internal wall of each of them being covered with a different phosphor.
  • the strike voltage of the tubes is repeated at the frequency of the supply network, said strike voltage being followed by a continuous arc holding voltage.

Abstract

L'élément émetteur de lumière (5) comprend trois sources lumineuses (RGB) de couleurs différentes dont l'excitation varie en fonction d'un signal émis par un capteur de phénomène physique, notamment un microphone (1). Le signal analogique (8) issu du capteur est tout d'abord converti en une série d'impulsions électriques (9) dans un convertisseur (3). Les flancs montants (6) desdites impulsions sont ensuite appliqués à un compteur (4) qui fournit à sa sortie (10) un signal codé qui change à l'arrivée de chaque flanc et qui détermine ainsi un état d'excitation différent des sources lumineuses. Le dispositif décrit permet le changement de couleur de l'élément (5) au rythme d'un signal musical.The light emitting element (5) comprises three light sources (RGB) of different colors whose excitation varies as a function of a signal emitted by a sensor of physical phenomenon, in particular a microphone (1). The analog signal (8) from the sensor is first converted into a series of electrical pulses (9) in a converter (3). The rising edges (6) of said pulses are then applied to a counter (4) which provides at its output (10) a coded signal which changes on the arrival of each edge and which thus determines an excitation state different from the light sources. . The device described allows the change of color of the element (5) at the rate of a musical signal.

Description

La présente invention est relative.à un dispositif d'alimentation d'un élément émetteur de lumière équipé d'au moins deux sources lumineuses rayonnant chacune une couleur fondamentale différente, la teinte émise par ledit élément changeant de couleur en fonction des variations d'un signal électrique analogique fourni par un capteur de phénomène physique, notamment un microphone.The present invention relates to a device for supplying a light emitting element equipped with at least two light sources each radiating a different fundamental color, the tint emitted by said element changing color as a function of variations in a analog electrical signal supplied by a physical phenomenon sensor, in particular a microphone.

Des éléments émetteurs de lumière englobant plusieurs sources lumineuses de couleurs différentes sont connus. Le document FR-A-2 186 624 propose un ensemble de trois sources lumineuses de couleurs différentes combinées avec un réflecteur assurant le mélange de ces couleurs. Pour varier individuellement l'intensité lumineuse de chacune de ces sources, on utilise une bande de papier dotée de trois pistes dont la transparence varie en fonction de l'éclairement à fournir à chaque instant par chaque source lumineuse. La transparence est mesurée par des cellules photo- électriques de sorte que lorsque la bande défile, la teinte résultante émise par le réflecteur varie. Le document US-A-3 564 332 décrit un système très semblable à celui qui vient d'être cité où l'élément de commande de changement de teinte se présente sous la forme d'un disque tournant de façon continue.Light emitting elements encompassing several light sources of different colors are known. Document FR-A-2 186 624 proposes a set of three light sources of different colors combined with a reflector ensuring the mixing of these colors. To individually vary the light intensity of each of these sources, a strip of paper with three tracks is used, the transparency of which varies according to the illumination to be provided at each instant by each light source. The transparency is measured by photoelectric cells so that when the strip passes, the resulting shade emitted by the reflector varies. Document US Pat. No. 3,564,332 describes a system very similar to that which has just been mentioned, where the color change control element is in the form of a continuously rotating disc.

Par ailleurs, il a déjà été proposé de commander l'intensité de lumière d'une source lumineuse au moyen d'un signal musical tiré d'un microphone ou d'un enregistrement couché sur un support, par exemple une bande magnétique ou un disque. Le brevet US-A-3 222 574 décrit un tel système ou le signal musical est d'abord divisé en trois bandes de fréquence et où les signaux ainsi filtrés attaquent chacun une lampe distincte dont la première réagit aux fréquences élevées, la seconde aux fréquences moyennes et la troisième aux fréquences basses. Ces systèmes sont utilisés couramment en électronique de divertissement et mis en oeuvre chez soi, ou dans des discothèques.Furthermore, it has already been proposed to control the light intensity of a light source by means of a musical signal drawn from a microphone or from a recording lying on a support, for example a magnetic tape or a disc. . US-A-3,222,574 describes such a system where the musical signal is first divided into three frequency bands and where the signals thus filtered each attack a separate lamp, the first of which reacts at high frequencies, the second at frequencies medium and the third at low frequencies. These systems are commonly used in entertainment electronics and implemented at home, or in discotheques.

Les dispositifs basés sur une discrimination des fréquences font aussi dépendre généralement l'intensité lumineuse du volume sonore. Ils présentent cependant plusieurs inconvénients. D'abord, si l'on a affaire à une source sonore présentant une bande passante limitée (par exemple radio en modulation d'amplitude) la teinte lumineuse correspondante présentera une dominante colorée imposée par les systèmes de filtre. Si le rouge est choisi pour les basses fréquences, le vert pour les moyennes fréquences et le bleu pour les fréquences aiguës, la teinte restituée par le son de la radio en AM se situera presque exclusivement dans le rouge et le vert ainsi que le mélange de ces deux couleurs. De même, un enregistrement rythmé dont la cadence est marquée par des cordes (contrebasse) produira à peu près le même effet. Dans ces cas, le bleu sera presque totalement absent de la palette de lumière. On pourrait citer aussi des exemples où le registre sonore se trouve déporté vers les fréquences aiguës ou extrêmes aiguës, auquel cas ce serait le rouge qui n'apparaîtrait pas ou peu. Ensuite, il faut signaler que tous les systèmes qui sont proposés aujourd'hui présentent une intensité lumineuse qui varie en fonction du volume sonore. Ceci a pour inconvénient de falloir procéder à un ajustement de sensibilité lorsqu'on passe d'une source sonore (faiblement enregistrée) à une autre (fortement enregistrée). Enfin, les systèmes proposés présentent pendant les silences musicaux ou pendant les passages doux de la musique des états "noirs" indésirables.Devices based on frequency discrimination also generally make the light intensity depend on the sound volume. However, they have several drawbacks. First, if we are dealing with a sound source having a limited bandwidth (for example radio in amplitude modulation) the corresponding light shade will have a dominant color imposed by the filter systems. If red is chosen for the low frequencies, green for the medium frequencies and blue for the high frequencies, the shade restored by the sound of the radio in AM will be located almost exclusively in red and green as well as the mixture of these two colors. Similarly, a rhythmic recording whose cadence is marked by strings (double bass) will produce roughly the same effect. In these cases, blue will be almost completely absent from the light palette. We could also cite examples where the sound register is deported to the acute or extreme extreme frequencies, in which case it would be red which would appear little or not at all. Then, it should be noted that all the systems that are proposed today have a light intensity which varies according to the sound volume. This has the disadvantage of having to adjust the sensitivity when switching from one sound source (weakly recorded) to another (strongly recorded). Finally, the proposed systems present undesirable "black" states during musical silences or during soft passages of music.

Aussi, dans le but de remédier aux inconvénients cités ci-dessus, la présente invention est caractérisée par le fait que le dispositif d'alimentation des sources lumineuses comporte un convertisseur apte à convertir le signal analogique fourni par un capteur, notamment un microphone, en une série d'impulsions électriques dont les flancs montants ou descendants se succèdent à un rythme qui est dépendant des variations dudit signal analogique et un compteur utilisant les flancs montants ou descendants de chacune desdits impulsions pour fournir à sa sortie un signal codé dont l'état change chaque fois qu'est appliqué audit compteur un desdits flancs montants ou descendants, chacun desdits états dudit signal codé déterminant un état d'excitation prédéterminé desdites sources lumineuses.Also, in order to remedy the drawbacks mentioned above, the present invention is characterized in that the device for supplying light sources comprises a converter capable of converting the analog signal supplied by a sensor, in particular a microphone, into a series of electrical pulses whose rising or falling edges follow one another at a rate which is dependent on the variations of said analog signal and a counter using the rising or falling edges of each of said pulses to provide at its output a coded signal whose state changes each time one of said rising or falling edges is applied to said counter, each of said states of said coded signal determining a predetermined state of excitation of said light sources.

Ainsi, un but important que se propose d'atteindre la présente invention est de faire dépendre l'allumage des sources lumineuses non de la fréquence ou du niveau d'un signal analogique, tel celui issu d'un microphone par exemple, mais d'un signal codé qui change en fonction des variations de ce signal. A chaque changement d'état du signal codé correspond une excitation différente des sources lumineuses et ceci selon une séquence déterminée qui se répète.Thus, an important aim which the present invention proposes to achieve is to make the ignition of light sources depend not on the frequency or on the level of an analog signal, such as that coming from a microphone for example, but on a coded signal which changes according to the variations of this signal. Each change of state of the coded signal corresponds to a different excitation of the light sources and this according to a determined sequence which is repeated.

Un autre but que l'invention se propose d'atteindre est de mettre en oeuvre un convertisseur de code dont le rôle consiste, pour une séquence déterminée, à augmenter le nombre d'états possibles que peut prendre le signal codé dans cette séquence.Another object which the invention proposes to achieve is to implement a code converter whose role consists, for a determined sequence, in increasing the number of possible states that the coded signal can take in this sequence.

L'invention sera comprise maintenant à l'aide de la description qui suit et du dessin qui l'illustre qui représente à titre d'exemple plusieurs formes d'exécution du dispositif d'alimentation selon l'invention.

  • La figure 1 est une représentation schématique du dispositif d'alimentation selon l'invention.
  • La figure 2 est un schéma détaillé du dispositif d'alimentation selon un premier mode d'exécution.
  • La figure 3 est un diagramme se rapportant à la figure 2.
  • La figure 4 est un schéma partiel du dispositif d'alimentation selon un deuxième mode 'd'exécution et qui concerne une variante apportée au convertisseur 3 montré en figure 2.
  • La figure 5 est un diagramme se rapportant au deuxième mode d'exécution.
  • La figure 6 est un schéma partiel du dispositif d'alimentation selon un troisième mode d'exécution et qui concerne, d'une part, une variante apportée au compteur 4 et, d'autre part, l'adjonction d'un circuit supplémentaire intercalé entre le compteur 4 et les sources lumineuses BGR.
  • La figure 7 est un schéma partiel du dispositif d'alimentation selon un quatrième mode d'exécution et qui concerne l'adjonction d'un circuit convertisseur de code intercalé entre le compteur 4 et les sources lumineuses BGR.
The invention will now be understood with the aid of the description which follows and of the drawing which illustrates it which shows by way of example several embodiments of the supply device according to the invention.
  • Figure 1 is a schematic representation of the supply device according to the invention.
  • Figure 2 is a detailed diagram of the supply device according to a first embodiment.
  • Figure 3 is a diagram relating to Figure 2.
  • FIG. 4 is a partial diagram of the supply device according to a second embodiment and which relates to a variant made to the converter 3 shown in FIG. 2.
  • Figure 5 is a diagram relating to the second embodiment.
  • Figure 6 is a partial diagram of the supply device according to a third embodiment and which relates, on the one hand, to a variant made to the counter 4 and, on the other hand, the addition of an additional circuit inserted between counter 4 and BGR light sources.
  • FIG. 7 is a partial diagram of the supply device according to a fourth embodiment and which relates to the addition of a code converter circuit interposed between the counter 4 and the BGR light sources.

La figure 1 montre un élément émetteur de lumière équipé de trois sources lumineuses référencées B (bleu), G (vert) et R (rouge). La teinte émise par cet élément va changer de couleur en fonction des variations d'un signal électrique analogique fourni par un capteur de phénomène physique, ici un microphone 1. Comme la tension recueillie aux bornes du microphone est faible, on l'amplifie par l'amplificateur 2 à la sortie duquel on trouve un signal 8 d'amplitude suffisante pour attaquer le dispositif selon l'invention. Ce dispositif comprend d'abord un convertisseur 3 qui transforme le signal analogique 8 en une série d'impulsions 9 dont les flancs montants 6 et descendants 7 se suivent à un rythme qui est dépendant des variations du signal analogique 8. Le dispositif d'alimentation selon l'invention comporte encore un compteur 4 qui utilise les flancs montants ou descendants (ici de préférence les flancs montants 6) de chacune desdites impulsions 9 pour fournir à sa sortie un signal codé 10 dont l'état change chaque fois qu'est appliqué au compteur 4 un des flancs montants ou descendants des impulsions 9. Chacun des états successifs se présentant à la sortie du compteur 4 détermine un état d'excitation déterminé des sources lumineuses. Ainsi selon l'exemple présenté en figure 1, l'état 1 0 1 du signal 10 excite les lampes B et R pendant que la lampe G reste éteinte. Si B et R rayonnent respectivement une couleur bleue et rouge, la teinte de l'élément émetteur de lumière 5 sera le violet.Figure 1 shows a light emitting element equipped with three light sources referenced B (blue), G (green) and R (red). The color emitted by this element will change color to function of variations in an analog electrical signal supplied by a physical phenomenon sensor, here a microphone 1. As the voltage collected across the microphone is low, it is amplified by amplifier 2 at the output of which there is a signal 8 of sufficient amplitude to attack the device according to the invention. This device firstly comprises a converter 3 which transforms the analog signal 8 into a series of pulses 9 whose rising sides 6 and falling 7 follow one another at a rate which is dependent on variations in the analog signal 8. The power supply device according to the invention also comprises a counter 4 which uses the rising or falling edges (here preferably the rising edges 6) of each of said pulses 9 to provide at its output a coded signal 10 whose state changes each time it is applied at the counter 4 one of the rising or falling sides of the pulses 9. Each of the successive states occurring at the output of the counter 4 determines a determined state of excitation of the light sources. Thus according to the example presented in FIG. 1, the state 1 0 1 of the signal 10 excites the lamps B and R while the lamp G remains off. If B and R radiate a blue and red color respectively, the tint of the light emitting element 5 will be purple.

Dans l'exemple de la figure 1, on utilise trois sources lumineuses, ce qui est le cas le plus fréquent pour aboutir à une large palette de teintes différentes. On notera cependant que deux sources suffiraient pour réaliser déjà des changements de teinte selon que l'une ou l'autre desdites sources est allumée ou qu'elles sont allumées ensemble. Le mélange des couleurs est réalisé naturellement si l'observateur prend du recul pour considérer l'élément émetteur de lumière. Si cet élément doit être observé de près, on disposera entre l'observateur et les sources lumineuses un écran translucide 11 qui réalisera ce mélange par addition.In the example of FIG. 1, three light sources are used, which is the most frequent case for arriving at a large palette of different shades. It will be noted however that two sources would suffice to already carry out color changes depending on whether one or the other of said sources is on or whether they are on together. The colors are mixed naturally if the observer takes a step back to consider the light emitting element. If this element has to be observed closely, there will be between the observer and the light sources a translucent screen 11 which will effect this mixing by addition.

La figure 2 est un schéma détaillé du dispositif d'alimentation dont le schéma de principe a été expliqué plus haut et selon un premier mode d'exécution. On retrouve ici les différents éléments 1, 2, 3, 4 et 5 exposés à la figure 1 et qui vont être expliqués maintenant dans le détail.FIG. 2 is a detailed diagram of the supply device, the principle diagram of which has been explained above and according to a first embodiment. Here we find the different elements 1, 2, 3, 4 and 5 exposed in Figure 1 and which will now be explained in detail.

Le capteur de phénomène physique 1 permet de faire correspondre à l'amplitude d'une grandeur physique une teinte déterminée. Ici la grandeur en question est un signal acoustique ou musical capté par un microphone. Ce pourrait être cependant une autre grandeur, par exemple l'angle de rotation d'un axe, le déplacement d'une manette de commande, une température, etc. Le microphone utilisé est de préférence du type electret'avec son propre préamplificateur.The physical phenomenon sensor 1 makes it possible to correspond to the amplitude of a physical quantity a determined shade. Here the quantity in question is an acoustic or musical signal picked up by a microphone. It could however be another quantity, for example the angle of rotation of an axis, the displacement of a control handle, a temperature, etc. The microphone used is preferably of the electret type with its own preamplifier.

Les signaux électriques issus du microphone 1 sont appliqués ensuite à un amplificateur 2 qui comporte deux amplis opérationnels 12 et 13 connectés en cascade. Un potentiomètre 14 permet de régler le gain de l'amplificateur 2. Le bloc 2 est alimenté en tension continue, comme les blocs 1, 3 et 4 d'ailleurs, par une source non représentée et par l'intermédiaire des lignes marquées +. On recueille à la sortie 15 de l'amplificateur 2 un signal analogique ayant l'allure de celui référencé 8 à la figure 1.The electrical signals from the microphone 1 are then applied to an amplifier 2 which comprises two operational amplifiers 12 and 13 connected in cascade. A potentiometer 14 makes it possible to adjust the gain of amplifier 2. Block 2 is supplied with DC voltage, like blocks 1, 3 and 4 moreover, by a source not shown and by means of the lines marked +. An analog signal having the appearance of that referenced 8 in FIG. 1 is collected at the output 15 of the amplifier 2.

Le signal présent sur la ligne 15 est ensuite appliqué au convertisseur 3 dont le but est de convertir ledit signal en une série d'impulsions électriques apparaissant sur la ligne de sortie 24 dudit convertisseur. Dans le mode étudié ici, cette conversion se fait de la façon suivante : En traversant la diode 16, le signal analogique est débarrassé de son alternance négative. L'alternance positive restante est représentée sous référence 17 à la figure 3a. Le signal ainsi redressé est appliqué ensuite à un intégrateur formé par le condensateur 18 et la résistance 19, ce qui a pour résultat la formation, au point 20, d'un nouveau signal qui est l'enveloppe du signal analogique redressé comme on peut le voir en 21 sur la figure 3a. Enfin, le signal enveloppe 21 est appliqué à un amplificateur opérationnel 22 fonctionnant en comparateur. Le signal 21 est comparé dans ce comparateur à un seuil de tension qui est référencé 23 sur la figure 3a et qui est déterminé par le diviseur formé par les résistances 30 et 31 représentées sur la figure 2. Sur la ligne 24 de sortie du comparateur, on trouve alors la série d'impulsions qui apparaît sur la figure 3b, le flanc de montée 6 des impulsions intervenant chaque fois que le signal enveloppe 21 dépasse la tension de seuil 23 et le flanc de descente chaque fois que ledit signal enveloppe tombe au-dessous de ladite tension de seuil.The signal present on line 15 is then applied to converter 3 whose purpose is to convert said signal into a series of electrical pulses appearing on the output line 24 of said converter. In the mode studied here, this conversion is done as follows: By crossing the diode 16, the analog signal is rid of its negative half-wave. The remaining positive half-cycle is shown under reference 17 in FIG. 3a. The signal thus rectified is then applied to an integrator formed by the capacitor 18 and the resistor 19, which results in the formation, at point 20, of a new signal which is the envelope of the rectified analog signal as can be see at 21 in Figure 3a. Finally, the envelope signal 21 is applied to an operational amplifier 22 operating as a comparator. The signal 21 is compared in this comparator to a voltage threshold which is referenced 23 in FIG. 3a and which is determined by the divider formed by the resistors 30 and 31 shown in FIG. 2. On the comparator output line 24, we then find the series of pulses which appears in FIG. 3b, the rising edge 6 of the pulses occurring each time the envelope signal 21 exceeds the threshold voltage 23 and the falling edge each time said envelope signal falls above below said threshold voltage.

Les impulsions de la figure 3b sont ensuite appliquées au compteur 4 sur son entrée Cl (clock) après avoir traversé l'inverseur 25. Le compteur 4 est du type à trois bits et présente sur ses sorties Q1, Q2 et Q3 23 = 8 états successifs différents. Chacune de ces sorties commande un interrupteur 26, 27, 28 à semi-conducteur qui commande à son tour l'allumage de la source lumineuse correspondante R, G, B. Le compteur 4 change d'état chaque fois qu'un flanc montant est appliqué à son entrée Cl alors qu'il est insensible au flanc descendant des impulsions de commande. Sur les sorties Q1, Q2 et Q3 du compteur on trouve les situations successives données par le tableau suivant qui donne aussi la séquence d'allumage des sources lumineuses R, G, B au fur et à mesure de l'apparition des flancs montants à l'entrée Cl du compteur :

Figure imgb0001
The pulses of FIG. 3b are then applied to the counter 4 on its input Cl (clock) after having passed through the inverter 25. The counter 4 is of the three-bit type and present on its outputs Q 1 , Q 2 and Q 3 2 3 = 8 different successive states. Each of these outputs controls a semiconductor switch 26, 27, 28 which in turn controls the ignition of the corresponding light source R, G, B. The counter 4 changes state each time a rising edge is applied to its input Cl while it is insensitive to the falling edge of the control pulses. On the outputs Q 1 , Q 2 and Q 3 of the counter there are the successive situations given by the following table which also gives the sequence of lighting of the light sources R, G, B as and when the flanks appear amounts at the Cl input of the counter:
Figure imgb0001

Puis la séquence recommence. On trouvera en figure 3 l'état des sorties Qj, Q2 et Q3 pour les trois flancs montants successifs présentés en figure 3b et, tout au bas de la figure 3, les combinaisons de couleurs qui en résultent.Then the sequence begins again. We will find in Figure 3 the state of outputs Q j , Q 2 and Q 3 for the three successive rising sides presented in Figure 3b and, at the bottom of Figure 3, the color combinations that result.

L'examen de la figure 3a montre que la valeur de choix du seuil de tension 23 est critique. Si le niveau musical est très élevé, il se maintiendra en-dessus de ce seuil et il n'y aura pas ou peu de changement de couleur. Inversément dans le cas d'un niveau musical faible, le signal enveloppe pourra être confiné en-dessous du seuil 23. Pour éviter en partie cet inconvénient, on pourrait utiliser un amplificateur 2 qui serait équipé d'un contrôle automatique de gain (AGC) à la place de la commande manuelle assurée par l'élément 14. Cette façon de faire ne résoudrait cependant pas entièrement le problème car on pourrait encore trouver des variations brusques de volume qui ne seraient pas prises en compte alors qu'on s'attendrait à les voir faire changer de couleur l'élément émetteur de lumière. C'est le cas par exemple du changement de volume présenté par la pente 32 du signal de la figure 3a qui ne provoque aucun changement de couleur.The examination of FIG. 3a shows that the choice value of the voltage threshold 23 is critical. If the musical level is very high, it will remain above this threshold and there will be little or no change in color. Conversely, in the case of a low musical level, the envelope signal could be confined below the threshold 23. To partially avoid this drawback, an amplifier 2 could be used which would be equipped with automatic gain control (AGC). instead of the manual control provided by element 14. However, this would not entirely solve the problem since we could still find sudden variations in volume which would not be taken into account when we would expect to see them change the color of the light emitting element. This is the case for example of the change in volume presented by the slope 32 of the signal of FIG. 3a which does not cause any change in color.

Pour remédier à cet inconvénient, on aura recours à un deuxième mode d'exécution de l'invention et qui sera expliqué à l'aide de la figure 4 qui représente un convertisseur 3 modifié, tous les autres blocs étant semblables à ceux discutés à propos de la figure 2. Le convertisseur 3 de la figure 4 comporte un différentiateur disposé entre l'intégrateur 18, 19 et le comparateur 22. Ce différentiateur comprend le condensateur 33 et les deux résistances 34 et 35. Le signal enveloppe présent au point 20 est appliqué au condensateur 33 du différentiateur. Ce système a pour but d'abord de ramener le signal enveloppe à se centrer autour d'un niveau zéro et ensuite, si la valeur du condensateur 33 est choisie assez faible vis-à-vis des résistances 34 et 35, de faire agir le comparateur sur la pente du signal enveloppe. Dans ces conditions, chaque changement brusque du signal amènera le comparateur à produire un signal à sa sortie alors qu'un changement lent ne changera pas son état. Ceci est visible sur la figure 5. On a représenté en figure 5a le même signal enveloppe 21 que celui dessiné en figure 3a et qui est présent au point 20 de la figure 4. La figure 5b montre l'allure du signal différentié tel qu'il apparaît après le condensateur 33 et tel qu'il est appliqué au comparateur 22. Le signal différentié est comparé à la tension de seuil 36, ce qui produit à la sortie du comparateur la série d'impulsions qui apparaît à la figure 5c. A leur tour, les flancs montants 6 du signal changent l'état du compteur 4, ce qui produit une séquence de teintes consécutives aux divers états successifs pris par les sorties Q1 Q2 Q3 du compteur 4. La figure 5 montre clairement que, dans ce mode d'exécution, la pente 32 du signal de la figure 5a donne naissance à un flanc montant référencé 37 en figure 5c et qui provoque un changement de couleur alors que cela n'était pas le cas quand le convertisseur 3 n'était pas muni de différentiateur. On trouve donc pour le même signal enveloppe que celui pris en exemple dans le premier mode d'exécution une séquence de couleur qui présente un état supplémentaire tel que cela apparaît en figure 5 sur les sorties Q1, Q2 et Q3 des sorties du compteur.To remedy this drawback, a second embodiment of the invention will be used, which will be explained using FIG. 4 which represents a modified converter 3, all the other blocks being similar to those discussed in connection of Figure 2. The converter 3 of Figure 4 includes a differentiator disposed between the integrator 18, 19 and the comparator 22. This differentiator includes the capacitor 33 and the two resistors 34 and 35. The envelope signal present at point 20 is applied to capacitor 33 of the differentiator. The aim of this system is first of all to bring the envelope signal to center around a zero level and then, if the value of the capacitor 33 is chosen to be low enough with respect to the resistors 34 and 35, to cause the comparator on the slope of the envelope signal. Under these conditions, each sudden change of the signal will cause the comparator to produce a signal at its output whereas a slow change will not change its state. This can be seen in FIG. 5. The same envelope signal 21 is shown in FIG. 5a as that drawn in FIG. 3a and which is present at point 20 of FIG. 4. FIG. 5b shows the appearance of the differentiated signal such that it appears after the capacitor 33 and as it is applied to the comparator 22. The differentiated signal is compared to the threshold voltage 36, which produces at the output of the comparator the series of pulses which appears in FIG. 5c. In turn, the rising edges 6 of the signal change the state of the counter 4, which produces a sequence of tones consecutive to the various successive states taken by the outputs Q 1 Q 2 Q 3 of the counter 4. FIG. 5 clearly shows that , in this embodiment, the slope 32 of the signal in FIG. 5a gives rise to a rising edge referenced 37 in FIG. 5c and which causes a change in color when this was not the case when the converter 3 does not was not equipped with a differentiator. There is therefore for the same envelope signal as that taken as an example in the first embodiment a color sequence which has an additional state as it appears in FIG. 5 on the outputs Q 1 , Q 2 and Q 3 of the outputs of the counter.

La figure 6 est un schéma partiel du dispositif d'alimentation selon un troisième mode d'exécution. Dans cette exécution, d'une part, les sorties Q1, Q2 et Q3 du compteur 4 sont connectées à une porte NAND 38 et, d'autre part, les mêmes trois sorties sont connectées aux interrupteurs 28, 27 et 26 par l'intermédiaire des portes 39, 40 et 41 respectivement.Figure 6 is a partial diagram of the supply device according to a third embodiment. In this embodiment, on the one hand, the outputs Q 1 , Q 2 and Q 3 of the counter 4 are connected to a NAND gate 38 and, on the other hand, the same three outputs are connected to the switches 28, 27 and 26 by through doors 39, 40 and 41 respectively.

On remarque que la sortie de la porte 38 est connectée à l'entrée LOAD du compteur, que l'entrée P1 est connectée au plus de l'alimentation alors que les entrées P2 et P3 sont connectées à la masse. Cette combinaison a pour but d'empêcher l'état 0 0 0 à la sortie du compteur. En effet, quand le signal 111 se présente sur les entrées de la porte 38, il prend naissance un signal 0 à la sortie de ladite porte, ce qui a pour conséquence de présélectionner le compteur selon l'état imposé aux entrées P1, P2 et P3 quand arrivera le prochain flanc montant Cl. Ici la présélection se fera sur la valeur 100. Ainsi l'état 0 0 0 qui se trouve entre l'état 1 1 1 et 1 0 0 (comme on peut le voir sur le tableau donné plus haut) se trouve supprimé. Cette programmation a pour but d'éviter un état noir dans la séquence qui se trouve alors réduite à 7 états différents.It is noted that the output of gate 38 is connected to the LOAD input of the counter, that the input P 1 is connected to the most of the power supply while the inputs P 2 and P 3 are connected to ground. The purpose of this combination is to prevent the state 0 0 0 at the output of the counter. In fact, when the signal 111 is present on the inputs of the door 38, a signal 0 arises at the output of the said door, which has the consequence of preselecting the counter according to the state imposed on the inputs P 1 , P 2 and P 3 when the next rising edge Cl arrives. Here the preselection will be made on the value 100. Thus the state 0 0 0 which is between state 1 1 1 and 1 0 0 (as we can see on the table given above) is deleted. The purpose of this programming is to avoid a black state in the sequence which is then reduced to 7 different states.

Comme le montre encore la figure 6, des moyens de portes sont disposées entre les sorties Q1, Q2 et Q3 du compteur et les sources lumineuses. Cette disposition a pour but d'empêcher pendant un laps de temps prédéterminé l'application du signal codé aux sources lumineuses lors de chaque changement d'état de ce signal. Il a en effet été remarqué qu'une pause très courte (pause noire) entre le passage d'une couleur à l'autre donne une impression plus marquée de ce passage que si le changement était réalisé sans pause. Les portes 39, 40 et 41 reçoivent sur leurs premières entrées les signaux Q1, Q2 et Q3 respectivement et sur leurs secondes entrées mises en parallèles un signal 42 qui est la différentiation du flanc descendant de l'impulsion de commande arrivant par la ligne 24. La différentiation est réalisée par le RC constitué par le condensateur 43 et la résistance 44. On dimensionnera les éléments 43 et 44 de façon à obtenir de préférence une pause avant l'allumage de l'ordre de 50 à 100 ms.As again shown in Figure 6, door means are arranged between the outputs Q 1 , Q 2 and Q 3 of the meter and the light sources. The purpose of this arrangement is to prevent for a predetermined period of time the application of the coded signal to the light sources during each change of state of this signal. It has indeed been noticed that a very short pause (black pause) between the change from one color to another gives a more marked impression of this change than if the change was made without a break. The gates 39, 40 and 41 receive on their first inputs the signals Q 1 , Q 2 and Q 3 respectively and on their second inputs put in parallel a signal 42 which is the differentiation of the falling edge of the control pulse arriving by the line 24. The differentiation is carried out by the RC constituted by the capacitor 43 and the resistor 44. The elements 43 and 44 will be dimensioned so as to preferably obtain a pause before ignition on the order of 50 to 100 ms.

La figure 7 est un schéma partiel du dispositif d'alimentation selon un quatrième mode d'exécution selon l'invention. Ici on dispose entre le compteur 4 et les sources lumineuses RGB un convertisseur de code 45. Si le compteur 4 est du type à n bits, il présentera à sa sortie 2n états successifs différents. En interposant entre les n sorties Q du compteur et les trois sources lumineuses un convertisseur de code 45 présentant n entrées et trois sorties, on disposera à la sortie dudit convertisseur également de 2n états successifs différents, alors que les solutions données jusqu'ici ne permettaient que 23 = 8 états successifs différents, comme on l'a déjà dit. Dans ce cas où n = 4 (exemple de la figure 7), on aura 2 = 16 états successifs différents ainsi que le montre le tableau suivant qui est un exemple de choix parmi beaucoup d'autres et où R = rouge, B = bleu, G = vert et W = blanc.

Figure imgb0002
FIG. 7 is a partial diagram of the supply device according to a fourth embodiment according to the invention. Here we has a code converter 45 between the counter 4 and the RGB light sources. If the counter 4 is of the n-bit type, it will present at its output 2 n different successive states. By interposing between the n outputs Q of the counter and the three light sources a code converter 45 having n inputs and three outputs, there will be available at the output of said converter also 2 n different successive states, whereas the solutions given so far do not allowed that 23 = 8 different successive states, as we have already said. In this case where n = 4 (example of figure 7), we will have 2 = 16 different successive states as shown in the following table which is an example of choice among many others and where R = red, B = blue , G = green and W = white.
Figure imgb0002

Le début de cette séquence à 16 états différents montre qu'on a choisi des couleurs opposées lors des transitions en passant d'une couleur fondamentale à son complément. Cette manière de faire augmente l'impression de contraste, ce qui amène à une représentation visuelle plus contrastée du registre musical.The beginning of this sequence with 16 different states shows that we chose opposite colors during transitions from a fundamental color to its complement. This way of doing things increases the impression of contrast, which leads to a more contrasted visual representation of the musical register.

Le convertisseur de code 45 utilisé est du type à mémoire programmable appelée généralement PROM. Le convertisseur de code peut être programmé à volonté et un exemple vient d'être donné dans le tableau ci-dessus. On remarque en particulier que l'état 0 0 0 0 n'a plus besoin d'être supprimé puisqu'il correspond dans l'exemple donné à une couleur, notamment le blanc (W) résultat de l'excitation simultanée des trois couleurs RGB.The code converter 45 used is of the programmable memory type generally called PROM. The code converter can be programmed at will and an example has just been given in the table above. We note in particular that the state 0 0 0 0 no longer needs to be deleted since it corresponds in the example given to a color, in particular white (W) result of the simultaneous excitation of the three RGB colors .

Dans la figure 7, on notera que l'inverseur à transistor 25 représenté en figure 2 a été remplacé ici par une porte NAND 46 interposée entre la ligne 24 et l'entrée Cl du compteur 4.In FIG. 7, it will be noted that the transistor inverter 25 represented in FIG. 2 has been replaced here by a NAND gate 46 interposed between line 24 and the input Cl of counter 4.

De même, la disposition prise en figure 6 pour empêcher pendant un court laps de temps l'application du signal codé aux sources lumineuses RGB est mise en oeuvre aussi dans le mode d'exécution de la figure 7. La façon de réaliser cette fonction est cependant simplifiée par le fait que le convertisseur PROM 45 possède une entrée unique CE. Après avoir été différentié par le condensateur 47 et la résistance 48, puis inversé par la porte 49, le flanc descendant des impulsions présentes sur la ligne 24 commande l'entrée CE de la mémoire 45.Likewise, the arrangement taken in FIG. 6 to prevent for a short period of time the application of the coded signal to the RGB light sources is also implemented in the embodiment of FIG. 7. The way of performing this function is however simplified by the fact that the PROM 45 converter has a single CE input. After having been differentiated by the capacitor 47 and the resistor 48, then reversed by the gate 49, the falling edge of the pulses present on the line 24 controls the input CE of the memory 45.

Les sources lumineuses RGB représentées dans les diverses figures peuvent être du type à incandescence, chacune présentant un bulbe coloré différent. L'alimentation de ces lampes est faite par une source de tension continue de valeur + U si les interrupteurs 26, 27 et 28 sont de simples transistors. Si cette tension devait être une source alternative, on utilisera comme interrupteur à semi-conducteur un système à diac-triac par ailleurs bien connu de l'état de la technique.The RGB light sources shown in the various figures may be of the incandescent type, each having a different colored bulb. The supply of these lamps is made by a DC voltage source of value + U if the switches 26, 27 and 28 are simple transistors. If this voltage were to be an alternative source, a diac-triac system which is also well known in the state of the art will be used as the semiconductor switch.

Ces sources lumineuses pourraient aussi être des tubes fluorescents, la paroi interne de chacun d'entre eux étant recouverte d'un phosphor différent. Dans ce cas, la tension d'amorçage des tubes se répète à la fréquence du réseau d'alimentation, ladite tension d'amorçage étant suivie par une tension continue de maintien de l'arc.These light sources could also be fluorescent tubes, the internal wall of each of them being covered with a different phosphor. In this case, the strike voltage of the tubes is repeated at the frequency of the supply network, said strike voltage being followed by a continuous arc holding voltage.

On notera encore que l'absence d'état noir présenté par les troisième et quatrième modes d'exécution (figures 6 et 7) a pour conséquence que l'élément émetteur de lumière rayonne toujours au moins une teinte, que ce soit à la mise en service du dispositif d'alimentation, pendant des pauses musicales ou encore pendant les piano du signal musical.It will also be noted that the absence of a black state presented by the third and fourth embodiments (FIGS. 6 and 7) has the consequence that the light-emitting element always radiates at least one shade, whether when put in use of the power supply device, during musical breaks or even during the piano of the musical signal.

Enfin, il faut remarquer que les troisième et quatrième modes d'exécution sont utilisés conjointement avec les blocs 1, 2 et 3 présentés en figure 1. En particulier, te bloc 3 peut être celui décrit en figure 2 ou en figure 4.Finally, it should be noted that the third and fourth embodiments are used in conjunction with blocks 1, 2 and 3 presented in FIG. 1. In particular, block 3 can be that described in FIG. 2 or in FIG. 4.

Claims (8)

1. Dispositif d'alimentation d'un élément émetteur de lumière (5) équipé d'au moins deux sources (B, R) lumineuses rayonnant chacune une couleur fondamentale différente, la teinte émise par ledit élément changeant de couleur en fonction des variations d'un signal électrique analogique (8) fourni par un capteur de phénomène physique (1), notamment un microphone, caractérisé par le fait qu'il comporte un convertisseur (3) apte à convertir ledit signal analogique en une série d'impulsions électriques (9) dont les flancs montants (6) et descendants (7) se succèdent à un rythme qui est dépendant des variations dudit signal analogique et un compteur (4) utilisant les flancs montants ou descendants de chacune desdits impulsions pour fournir à sa sortie un signal codé (10) dont l'état change chaque fois qu'est appliqué audit compteur un desdits flancs montants ou descendants, chacun desdits états dudit signal codé déterminant un état d'excitation prédéterminé desdites sources lumineuses.1. Device for supplying a light emitting element (5) equipped with at least two light sources (B, R) each radiating a different fundamental color, the tint emitted by said element changing color as a function of variations d an analog electrical signal (8) supplied by a physical phenomenon sensor (1), in particular a microphone, characterized in that it comprises a converter (3) capable of converting said analog signal into a series of electrical pulses ( 9) whose rising (6) and falling (7) flanks follow one another at a rate which is dependent on variations of said analog signal and a counter (4) using the rising or falling flanks of each of said pulses to provide a signal at its output coded (10) whose state changes each time one of said rising or falling edges is applied to said counter, each of said states of said coded signal determining a predetermined state of excitation of said light sources. 2. Dispositif selon la revendication 1, caractérisé par le fait que le convertisseur (4) comporte un intégrateur (18, 19) apte à fournir un signal qui est l'enveloppe dudit signal analogique et un comparateur (22) pour comparer ledit signal enveloppe à un seuil de tension prédéterminé (23, 36) et fournir à sa sortie un flanc d'impulsion (6, 7) dès que l'amplitude dudit signal enveloppe dépasse ou tombe au-dessous dudit seuil de tension prédéterminé.2. Device according to claim 1, characterized in that the converter (4) comprises an integrator (18, 19) capable of supplying a signal which is the envelope of said analog signal and a comparator (22) for comparing said envelope signal at a predetermined voltage threshold (23, 36) and providing at its output a pulse edge (6, 7) as soon as the amplitude of said envelope signal exceeds or falls below said predetermined voltage threshold. 3. Dispositif selon la revendication 2, caractérisé par le fait qu'il comporte en outre un différentiateur (33, 34, 35) disposé entre l'intégrateur et le comparateur pour différentier le signal enveloppe, ledit comparateur générant un flanc d'impulsion dès que le signal enveloppe différentié dépasse ou tombe au-dessous dudit seuil de tension prédéterminé (36).3. Device according to claim 2, characterized in that it further comprises a differentiator (33, 34, 35) disposed between the integrator and the comparator to differentiate the envelope signal, said comparator generating a pulse edge from that the differentiated envelope signal exceeds or falls below said predetermined voltage threshold (36). 4. Dispositif selon la revendication 1, caractérisé par le fait que l'élément émetteur de lumière est équipé de trois sources lumineuses (R, G, B) rayonnant chacune une couleur fondamentale et que le compteur (4) est du type à trois bits présentant à sa sortie 23 états successifs différents et dont chacune des trois sorties est reliée respectivement à une source lumineuse.4. Device according to claim 1, characterized in that the light emitting element is equipped with three light sources (R, G, B) each radiating a fundamental color and that the counter (4) is of the three-bit type having at its output 2 3 different successive states and each of the three outputs of which is connected respectively to a light source. 5. Dispositif selon la revendication 4, caractérisé par le fait que le compteur est programmé pour supprimer l'état 0 0 0 se présentant sur ses sorties.5. Device according to claim 4, characterized in that the counter is programmed to delete the state 0 0 0 occurring on its outputs. 6. Dispositif selon la revendication 4, caractérisé par le fait qu'il comprend des moyens de portes (39, 40, 41) situés entre chacune des sorties du compteur et les sources lumineuses correspondantes pour empêcher pendant un laps de temps prédéterminé l'application du signal codé aux sources lumineuses à chaque changement d'état dudit signal.6. Device according to claim 4, characterized in that it comprises door means (39, 40, 41) located between each of the outputs of the counter and the corresponding light sources to prevent during a predetermined period of time the application of the coded signal to the light sources each time the state of said signal changes. 7. Dispositif selon la revendication 1, caractérisé par le fait que l'élément émetteur de lumière (5) est équipé de trois sources lumineuses (R, G, B) rayonnant chacune une couleur fondamentale, que le compteur (4) est du type à n bits présentant à sa sortie 2n états successifs différents et qu'il comporte, disposé entre les n sorties dudit compteur et les trois sources lumineuses un convertisseur de code (45) présentant n entrées et trois sorties.7. Device according to claim 1, characterized in that the light emitting element (5) is equipped with three light sources (R, G, B) each radiating a fundamental color, that the counter (4) is of the type with n bits having at its output 2 n different successive states and that it comprises, arranged between the n outputs of said counter and the three light sources, a code converter (45) having n inputs and three outputs. 8. Dispositif selon la revendication 7, caractérisé par le fait que le convertisseur de code (45) est une mémoire programmable.8. Device according to claim 7, characterized in that the code converter (45) is a programmable memory.
EP86103471A 1985-03-18 1986-03-14 Supply circuit for a light emitter which changes colour Expired EP0195384B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8504085 1985-03-18
FR8504085A FR2579056B1 (en) 1985-03-18 1985-03-18 DEVICE FOR SUPPLYING A LIGHT-EMITTING ELEMENT WITH CHANGING COLORS

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EP0195384A1 true EP0195384A1 (en) 1986-09-24
EP0195384B1 EP0195384B1 (en) 1988-11-09

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EP86103471A Expired EP0195384B1 (en) 1985-03-18 1986-03-14 Supply circuit for a light emitter which changes colour

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US (1) US4668895A (en)
EP (1) EP0195384B1 (en)
JP (1) JPS61218093A (en)
AU (1) AU581587B2 (en)
CA (1) CA1248460A (en)
DE (1) DE3661155D1 (en)
FR (1) FR2579056B1 (en)
SG (1) SG90391G (en)

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CA1248460A (en) 1989-01-10
US4668895A (en) 1987-05-26
AU5485686A (en) 1986-09-25
JPH0546678B2 (en) 1993-07-14
FR2579056B1 (en) 1987-04-10
DE3661155D1 (en) 1988-12-15
AU581587B2 (en) 1989-02-23
SG90391G (en) 1991-11-22
EP0195384B1 (en) 1988-11-09
JPS61218093A (en) 1986-09-27
FR2579056A1 (en) 1986-09-19

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