WO1991001167A2

WO1991001167A2 - Game controller

Info

Publication number: WO1991001167A2
Application number: PCT/AT1990/000074
Authority: WO
Inventors: Gert BLÜHBERGER
Original assignee: Bluehberger Gert
Priority date: 1989-07-25
Filing date: 1990-07-24
Publication date: 1991-02-07
Also published as: AU5959890A; AT392179B; WO1991001167A3; ATA179389A

Abstract

A device for controlling games, in particular video games, that can be controlled by telephone, has a decoder linked to the game to be controlled which decodes the telephone signals. In order to simplify the design of such a device, the telephone is equipped in a known per se manner to emit compound signals and the decoder, which is if necessary linked to the game by a 4-bit binary decoder and by a switch, decodes the compound signals.

Description

Device for playing games

The invention relates to a device for carrying out games, in particular television games, which can be controlled via a telephone, a decode being provided which decodes the telephone signals and which is connected to the game to be controlled.

In known games of this type, these are controlled by voice signals. The decoder is formed by a speech computer that responds to a certain word spoken by the participant and emits a signal that affects the game.

The disadvantage of this solution is that the error rate of the speech computer is relatively high and only one control command can be triggered. The latter limits the design options of the game considerably. In addition, it is always necessary to check the response of the voice computer to the voice of the participant before starting the game and, if necessary, to adjust it after 1s.

In principle, it is also possible to use speech computers that respond to several words and trigger different signals accordingly. However, such Sprachcoiiiputer have a relatively long response time, which makes controlling the game considerably more difficult.

The aim of the invention is to avoid these disadvantages and to propose a device of the type mentioned at the outset, which is characterized by a simple structure and which enables the triggering of several commands for controlling the game and which is characterized by a very small size Delay time distinguishes.

According to the invention, this is achieved in that the telephone set is set up in a manner known per se for emitting multi-frequency signals and the decoder decodes multi-frequency signals, which is optionally connected to the game via a 4-bit binary decoder and a switching device.

With such a device, it is possible that game possibly using a conventional key phone. to control after switching to multi-frequency signal, the control simply by pressing the appropriate keys on the keypad.

Another possibility of controlling a game is also provided by plugging a universal code transmitter, which is commercially available, onto a rotary dial telephone or its mouthpiece, which can also be used to trigger multi-frequency signals as well as with the keys of a key telephone.

If a conventional decoder processing the multi-frequency signals is used, recognition times for these multi-frequency signals (hereinafter referred to as DTMF signals) are in the range from 10 to 50 ms. Since the decoder only responds to DTMF signals, the moderator has the opportunity to talk to the participant during game breaks without switching off the decoder, which is not possible with the known solutions using a speech computer, since the control tion takes place in the known solution with voice signals.

Furthermore, in the solution according to the invention it is possible in a simple manner to trigger several commands for the game, it being also possible to trigger a very large number of different commands. For example, 12 or even 16 different commands can be triggered by actuating one of the different keys of a key telephone with little circuitry complexity. If two-digit codes are used for triggering commands, even more commands can be triggered accordingly.

Furthermore, when two-digit key combinations are used, there is also the possibility that functions can be activated with some keys and deactivated with another key.

In the case of the button telephones currently approved in Austria, the speech connection is interrupted by actuating a number or star or route button and after 80 +/- 10 ms the corresponding DTMF signal is issued, which has a length of 80 +/- 10 ms. Then there is a pause of at least 80 +/- 10ms, regardless of whether another key is pressed or not. After a delay of 300 +/- 100ms after the last DTMF signal has been sent, the speech circuit is switched on again. However, arises when switching on, as well as when switching off the speech circuit usually a noise in the form of a crack lasting approx. 5ms.

According to a further feature of the invention can be seen that the phone is connected to the decoration via a mixer.

If you would go from the phone directly into the decoder, the circuit would have to be approved by the post and telegraph administration. On the other hand, if you take the signal from the mixer, all circuits connected to the telephone line have already been approved.

Furthermore, it can be provided that a 4-bit binary decoder and a computer are connected to the output of the decoder, which components are each followed by a switching unit, which are connected to the game.

The computer offers the possibility to play number games such as Playing the lottery, such a game being suitable for radio and visual radio. Participants can enter their tips into the computer using the DTMF signal generated over the phone and then their callback number. So that the computer can also know four-digit numbers, for example, the callers can press the »key between the numbers, for example, to separate the numbers entered. In this way, up to 300 listeners or seers can play along per hour and telephone connection without any personnel.

Furthermore, it can be provided that a delay circuit and a circuit having this switch connected to the mixer is connected. which circuit a noise detection circuit, e.g. such according to the magazine "Llrad" Issue 7/79 page 1 "Kl ickel iminator" is connected in parallel, which is connected to the control input of the switch, which short-circuits the sound signal of the telephone when a noise occurs or suppresses it in some other way.

This makes it possible to blank out the incoming noise, in particular the on and off noise (clicks), which, as already described, occurs when the speech circuit is switched on and off in the subscriber set, and is to be avoided by transmitting this noise during a radio or television game. The delay circuit ensures that the sound signal is delayed for as long as the noise detection circuit needs to detect noise. This ensures that the sound signal is short-circuited or interrupted in the presence of an interfering noise exactly during the occurrence of the interfering noise.

According to a further feature of the invention, it can be provided that a circuit formed from the monoflop circuit connected to the decoder and a switch connected to this and the mixer is connected in parallel to the mixer and the decoder connected to it.

In this way, too, it is possible to blank out noise, especially the switch-off crack. The monoflop circuit controls, for example, 200 ms after the DTMF signal has arrived, i.e. 200ms after the last DTMF signal coming from the subscriber, the switch for a duration of e.g. 200ms, which means that any incoming noise, e.g. a switch-off crack, is blanked out.

It can also be provided that a delay circuit is interposed between the mixer and the switch, the monoflop circuit being formed by a monoflop.

In this way it is possible to blank out noise, especially the switch-on crack.

The times result from the data of the comfort telephones approved by Austrian Post, which switch off the speech circuit 80 +/- 10ms before the first DTMF signal and only switch on again 300 +/- 100ms after the last DTMF signal.

It can also be provided that the fade-out period of the sound signal and the delay period of the delay circuit can be set manually or automatically. In the case of a precise adaptation to the subscriber's telephone, the blanking time can be set to e.g. Can be lowered by 10ms. These time constants can then be set before the telephone candidate goes on the air.

According to a further feature of the invention, it can be provided that the decoder is connected directly to an amplifier, which in turn is connected to the mixer via a delay circuit, the amplifier ker output side is connected to the mixer.

In this way it is ensured that the DTMF signals have the same Pe gel for all telephone candidates of the game.

According to a further feature of the invention, it can be seen that a tone generator is connected to the output of the decoder or a 4-bit binary decoder connected to it, a switch being provided which is connected to the decoder, the tone generator and the mixer , where at the switch either the tone generator or the delay circuit connected to the mixer connects to an input of the mixer, the control terminal of the switch being connected to the decoder.

This measure also ensures that the DTMF signals have the same level for all telephone candidates in the game.

It can also be provided that the decoder is connected to a monoflop which normalizes the duration of the signals emitted by the decode.

In this way it is ensured that the switching unit has a constant switching duration, regardless of how long the DTMF signal sent by the candidate for the telephone lasts.

These measures ensure the same conditions for all participants in the game.

The invention will be explained in more detail with reference to the drawing. Show:

Fig. 1 to 9 different embodiments of inventions and devices according to the invention

10 and 11 details of these circuits. Fig. 1 shows a simple design of a device according to the invention. In this case, the telephone 1 is connected to a mixer 2 to which a sound transmitter 3 is connected, since it is set up for the delivery of DTMF signals. Furthermore, a DTMF receiver 4 is connected to the mixer, which decodes the DTMF signal, which can be formed, for example, by an integrated circuit of the MT8870-B type. This DTMF receiver is referred to below as decoder 4. In the embodiment shown in FIG. 4, a 4-bit binary decoder 5 is connected to the decoration of FIG encoder 4 received signal into a decimal output signal, converts and issues control commands for the game via 12 output lines.

This 4-bit binary decoder 5 controls a switching unit 6 which is essentially formed by a number of switches which are controlled by the output signals of the 4-bit binary decoder 5 and which control the game 7.

On the one hand, the DTMF signals sent by the telephone candidate and the audio signals (voice) come via the telephone signal of the telephone 1, which means that the moderator of the game can talk to the candidate. The level of the signals is adjusted in the mixer to the required values in order to be able to be transmitted.

In principle, however, it should be noted that the telephone signals can also be fed directly to the DTMF receiver.

The DTMF receiver 4 recognizes an applied DTMF signal and decodes it. Sends e.g. If the candidate for the telephone receives the DTMF signal "1", the decoder sets the output line 1 to the logic state HIGH, whereas the other output lines have the logic state LOW or vice versa. In contrast, when the MVF signal "2" is present, the output line 2 of the decoder is set to HIGH.

The 4-bit decoder 5 connected to the decoder 4 can be used to derive a decimal output signal to the d-m 4-Bit binary decoder from the output signals of the decoder 4, with which the switching unit 6 is controlled. This makes it possible to influence the game with up to 12 different commands via the switching unit 6, only one key of the key unit of the telephone having to be actuated for each command. The switching unit 6 has e.g. 12 control outputs on.

If the game only requires a digital control signal which corresponds to the output signals of the 4-bit binary decoder or decoder 4, the switching unit can be dispensed with.

The embodiment according to FIG. 2 differs from that according to FIG. 1 in that a computer 8 is additionally connected to the DTMF receiver or decoder 4, which is connected to the output side via a switching unit 6 ' Game 7 is connected.

In this embodiment, a binary output signal of the DTMF receiver 4 can be passed directly into the computer 8, provided that it has a parallel interface and which evaluates and / or stores the output signal of the decoder 4 or performs the function of a programmable switching unit.

If the DTMF receiver 4 delivers a signal that cannot be evaluated by the computer, it must be correspondingly e.g. i a 4-bit signal or a serial signal can be converted.

The computer 8 controls the switching unit 6 ', it generates the signals required for the games 7 to be controlled. If the computer also evaluates multi-digit signals, the switching unit can accordingly have more than 12 switching outputs.

The switching unit 6 can also be omitted in the embodiment according to FIG. 2 and the game can only be controlled via the switching unit 6 '. The function of a video game can also be built into the computer 8. In this case, the switching unit 6 can also be dispensed with.

In the embodiment according to FIG. 3, which essentially corresponds to the embodiment according to FIG. 1, an interference noise detection circuit 9 and a switch 10 which blank the sound signals also correspond from ^ r, above all a delay circuit 11 with the mixer 2 connected is. This switch is driven by the noise detection circuit 9 and short-circuits the delayed Tonsi signal or suppresses it in a different way when egg noise is detected. This causes the noise to be blanked out.

The delay circuit 11 is required because the noise detection circuit 9 requires a certain amount of time to detect noise.

The embodiment according to FIG. 4 also enables the blanking of a disturbing noise (switch-off crack). For this purpose, the decoder 4 is connected to a monoflop circuit 1 which controls a switch 10 which, as already explained with reference to FIG. 3, with its switching path with de Mixer 2 is connected. The monoflop circuit 12 is provided that the control signal of the DTMF receiver 4 assumes the logic state HIGH when a DTMF signal is detected, preferably realized by two series-connected monoflops, the first monoflop, which should be retriggerable, so that it can be ensured that the monoflop circuit sets the output of the monoflop circuit 12 to HIGH only when the last DTMF signal detected by the decoder 4, as described below, drives the second monoflop after, for example, 200 ms after the last DTMF signal and the second monoflop the output of the Monoflop circuit for example sets to HIGH for 200ms and thus switches switch 10.

This monoflop circuit 12 receives a control signal from the decoder 4, which assumes the logic state HIGH during the time in which the DTMF signal is present. The monoflop circuit 12 controls e.g. 200ms the switch after which the signal coming from the DTMF receiver 4 has assumed the LOW state for the duration of e.g. 200ms. This means that 200ms after the last DTMF signal sent by the telephone candidate, the sound signal is short-circuited or suppressed for 200ms by closing switch 10 and thus blanked out. The specified delay time and the fade-out time of the tone signal ps result from the fact that the comfort telephones approved by Austrian Post only switch the speech control on again 300 +/- 100 ms after the last DTMF signal.

The delay time and the fade-out duration of the tone signal should also be adjustable manually or automatically, since the turn-off time of the tone signal could be reduced to, for example, 10 ms (duration of the changeover crack) if the phone candidate's phone was precisely adapted. These time constants would then have to be set before the telephone candidate goes on the air.

The monoflop circuit 12 can expediently be deactivated since it is only required if the subscriber's telephone emits interference noises when switching over to speech mode.

In the circuit according to FIG. 4 there is also the advantage over the circuit according to FIG. 3 that Noises coming from the telephone line are not genetically blanked out, but only those that are triggered by the MF signals, thereby preventing interruption of noise during a voice connection.

The monoflop circuit 12 'according to FIG. 5, in contrast to that according to FIG. 4, consists of a simple monoflop which, when an input-side HIGH signal is applied from the control line of the receiving circuit (decoder 4), is connected to the switch output line for a predeterminable one Duration, e.g. 95ms set to HIGH.

In this embodiment, the monoflop circuit 12 'controls the switch 10 at the beginning of a DTMF signal, except in the e.g. A DTMF signal has already been received 200 ms earlier. This means that the switch 10 is only activated if more than 200ms pause has elapsed between the DTMF signals, since the code transmitter in the telephone cannot have switched to voice transmission at a pause smaller than 200ms and therefore also no start-up crack can stand. This monoflop circuit 12 'is also deactivated.

The delay circuit 13 delays the audio signal by, for example, 95 ms longer than the DTMF receiver 4 requires to recognize the DTMF signal. Switch 10 is therefore activated for 95ms before the DTMF signal is present at switch 10 and the switch-on click is therefore hidden. The delay time of the delay and the duration of the fading out of the sound signal can be set manually or automatically, since if the time constant is precisely adjusted (to the telephone or telephone candidate), the delay time can usually be shortened and the duration of the fading out of the sound signal is limited to the duration of the switch-on can.

It is also possible to combine the circuits according to FIGS. 5 and 5 with one another. In this case, the first time constant of the monoflop circuit 12 must e.g. 135 can be lengthened, since the sound signal is present at the switch input at this time later in the circuit shown in FIG. 5 than in the circuit shown in FIG. 4.

In the circuit of FIG. 5, a delay circuit is necessary, the delay time of which is considerably longer than that provided in the circuit of FIG. 3 i st.

The circuit according to FIG. 6 is expanded by a monoflop 14 compared to the embodiment according to FIG. 1.

This monoflop circuit 14 causes a constant switching duration of the switching unit. This means that regardless of how long the DTMF pulse sent by the telephone candidate is, the pulse duration at the switching part is, for example, 140 ms. (80 ms +/- 10 ms signal + 80 ms +/- 10 ms pause).

This circuit expansion is necessary if all phone candidates should operate a game under the same conditions. (With a commercially available comfort telephone you can only send pulses of 80 +/- 10 ms, no matter how long the key is pressed. With a code transmitter or with a telephone that is not commercially available in Austria, you have the option of both shorter and longer pulses to send.) So that the circuit its

A retriggerable monoflop should be used not only for longer but also for shorter DTMF signals.

Without this circuit, a telephone candidate with a code transmitter would have the option e.g. to hold the pinball arms in the activated position indefinitely during a pinball game and thus the opportunity to stop the ball, which a telephone candidate with a comfort telephone could not.

If you set up this circuit so that the time constant can be changed, you can change it accordingly for games where, for example, the player is only allowed to operate one function per second.

The circuit according to FIG. 7 is expanded compared to that according to FIG. 1 by a delay circuit 13 and an amplifier 15.

The amplifier 15 is activated by the DTMF receiver 4 for the duration of a DTMF signal and amplifies or dampens the DTMF signal to a predetermined level.

In this way, the DTMF signals have the same level for all telephone candidates, regardless of whether they are calling from a comfort telephone or using a code transmitter. If the telephone candidate speaks softly, the audio signal can be amplified more without thinking, since the DTMF signal still maintains its preset volume. The delay circuit 13 is required in order to delay the audio signal for as long as the DTMF receiver needs for signal detection, since the amplifier 15 would otherwise regulate too late.

The circuit according to FIG. 8 is expanded compared to that according to FIG. 1 by a tone generator 16, the switch 10 and a delay circuit 13.

The circuit according to FIG. 8 has the same function as the circuit of FIG. 7, but here the DTMF signals sent by the candidate are not sent via the transmitter 3, but rather tones newly generated by the tone generator 16, which, of course, always the have the same level. Tone generator 16 could produce tones of any kind, preferably a tone generator which will of course use a tone generator which transmits the same DTMF signals as the candidate telephone. The tone generator 16 is controlled by the output signal of the 4-bit binary decoder 5. If necessary, the tone generator could also be controlled directly by the DTMF receiver 4. If the game requires only a simple audio signal while the candidate is sending DTMF signals, regardless of which of the 12 keys are pressed by the candidate, or a type of computer music is required, the tone generator 16 does not require any control, since the switch 10, which is controlled by the DTMF receiver 4, automatically switches to the tone generator during the transmission of DTMF signals and at the same time suppresses the tone signal of the telephone line. Suspends the transmission of DTMF signals, the switch 10 switches back to the audio signal from the telephone line and the signal from the tone generator is suppressed.

The delay circuit 13 is required again in order to ensure an equally large delay of audio and DTMF signals.

FIG. 9 shows a circuit which corresponds essentially to that of FIG. 2, but which is expanded with additional circuits according to FIGS. 4 to 6 and 8. However, some of the monoflop circuits are constructed differently and are dimensioned.

4, the monoflop circuit 12 has been adopted, which is provided for blanking out the switch-off crack. If the monoflop circuit 12 were used as in FIG. 4, the switch 10 would only be switched over during the switch-off crack (200 to 400 ms after the last DTMF signal). However, since a tone generator 16 is provided, it is necessary to additionally switch the switch 10 during the transmission of DTMF signals from a telephone candidate, since the DTMF signals which are transmitted via the transmitter no longer come from the caller, but from the tone generator be generated. The monoflop circuit 12 must therefore be dimensioned or constructed such that it switches the switch 10 both as described in connection with FIG. 4 during the switch-off crack, and also during the time in which the DTMF receiver 4 is receiving a DTMF Detects signal, ie during the time in which the control line of the DTMF receiver 4 is HIGH. Provided that the control signal of the DTMF receiver 4 assumes the logic state HIGH when a DTMF signal is detected, the monoflop circuit 12 is preferably as shown in FIG. 10. realized by two series-connected monoflops and one with the control signal of the DTMF receiver 4 and the output signal of the second monoflop on the input side connected OR gate (inputs of the OR gate), the first monoflop, which should be retriggerable, so that it can be ensured that the first monoflop only controls the second monoflop at the last DTMF signal detected by decoder 4, the second monoflop drives 200ms after the last DTMF signal, and the second monoflop drives the OR gate for 200ms from this point on. Since the second input of the OR gate is driven by it during the time in which the decoder 4 detects a DTMF signal, the OR gate controls the switch in both cases described above.

This means that the switch 10 fades out the sound signal on the telephone line and switches the sound generator through to the mixer, either when the DTMF receiver 4 passes on a signal to the switching unit or, for example, 300 ms after the last DTMF signal, in order to switch off the crackle, for example for a period of 10 ms to suppress. Of course, during the suppression of the switch-off crack, no input signal is sent to the mixer, since the tone generator is not an input signal received because the candidate does not send a DTMF signal at this time. However, as described in connection with the Fig., Is an independent tone generator, the. transmits tones without control, a blanking of the tone generator must be provided, which turns the tone generator off or fades out during blanking of the switch-off crack. This blanking of the tone generator could, however, also be installed in the former case in order to mask out any interfering noises from the inactive tone generator.

In the circuit described so far, the switch 10 between the transmission of the last DTMF signal and the switch-off crack would be the tone of the telephone line for e.g. Switch through for 200ms. Since this does not make sense, the monoflop circuit 12 should be designed so that it from the time of the DTMF signal detection by the DTMF receiver to e.g. 400 ms after the last DTMF signal, switches 10.

In this case, the monoflop circuit 12, provided that the control signal of the decoder 4 assumes the logic state HIGH when a DTMF signal is detected, is preferably, as shown in FIG. 11, by a monoflop and an realized OR gate connected on the input side with the control signal of the decoder 4 and the output signal of the monoflop, the monoflop (retriggerable> activating the OR gate for, for example, 400 ms after which the control signal of the decoder 4 changes to the LOW state) follows within this 400 ms new signal from decoder 4, the monoflop drives the OR gate again for 400ms after the control signal of decoder 4 has dropped, since the second input of the OR gate during the time in which DTMF receiver 4 receives a DTMF signal recognizes that this is being driven, the OR gate drives the switch in both of the cases described above, which means that switch 10 dazzles the tone signal of the telephone it and switches the tone generator through to the mixer when the decoder 4 transmits a signal towards the switching unit, and up to e.g. 400 ms after the last signal recognized by decoder 4.

In this case, of course, an independently operating tone generator would have to be blanked out or faded out again for this period of time, which is also the case with a DTMF tone generator would be advantageous for the reasons described above.

The delay circuit 13 has been adopted from FIG. This delays the audio signal of the telephone line by 95ms longer than the decoder ^ι needs to recognize DTMF signals (eg 40ms + 95ms = 135ms). If the decoder needs, for example, 40 ms to recognize a DTMF signal, the monoflop circuit 12 switches the switch 10 40 ms after the DTMF signal has been applied to the mixer or the telephone line. However, since the delay circuit 13 delays the audio signal by 135 ms, the switch 10 fades out the audio signal 95 ms before the DTMF signal comes from the delay circuit 13 and the switch-on crack is therefore suppressed. Since not all telephones deliver a switch-on crack, the delay circuit 13 should be switchable (from 40 ms to 135 ms) or controllable for the reasons described in connection with FIG. 5.

In order to achieve a uniform delay between the DTMF signal and the audio signal (DTMF signal is delayed 40 ms, the audio signal is delayed, for example, 135 ms), a second delay circuit could be used before or after the tone generator 16 in order to receive the signal generated by the tone generator to delay another 95ms, which would cancel the difference of 95ms. Regardless of the delay circuits, the switching unit 6 is already activated when a DTMF signal is detected.

From Fig. 6, the one-shot circuit 14 has been incorporated which produces at the output of the decoder 4, a pulse of constant duration of zB140ms when a DTMF signal ^"is sent via the telephone line, regardless of what length ausfweist this signal.

In connection with this monoflop circuit 14 with the tone generator 16 according to FIG. 8, the tone generator provides a further advantage:

If, for example, a telephone candidate with a code transmitter sends a signal that is longer or shorter than the time period set in the monoflop circuit 14, the tone generator 16 nevertheless sends a signal (tone) that has a length of a predetermined duration. This is advantageous inasmuch as the games are only controlled with a predetermined time constant and the viewers and the telephone candidates are confused would be if the sound signal had a different length or duration than the duration with which the corresponding functions are controlled in the game.

Instead of the monoflop circuit 1 (suppression of switch-off cracking) and the extended delay time (suppression of switch-on crackling), the interference noise detection circuit shown in FIG. 3 could also be used.

Claims

PATENT CLAIMS

1. Device for carrying out games, in particular television games, which can be controlled via a telephone, a decoder being provided which decodes the telephone signals and which is connected to the game to be controlled, characterized in that the telephone (1) in is set up in a manner known per se for the transmission of multi-frequency signals and the decoder (4) decodes the multi-frequency signals, which may be connected to the game (7) via a 4-bit binary decoder (5) and possibly a switching device (6) is.

2. Device according to claim 1, characterized in that the telephone (1) is connected via a mixer (2) to the decoder (4).

3. Device according to claim 1 or 2, characterized gekenn¬ characterized in that a 4-bit binary decoder (5) and or or a computer (8) are connected to the output of the decoder (4), which components are preferably each a switching unit (6,6 ') is connected downstream, which are connected to the game (7).

4. Device according to one of claims 1 to 3, characterized in that a delay circuit (11) and a switch (10) connected downstream of the latter is connected to the mixer (2), which circuit (10, 11) a noise detection circuit (9) is connected in parallel and is connected to the control input of the switch (10), which short-circuits or suppresses the sound signal of the telephone (1) when a noise occurs.

5. Device according to one of claims 1 to 3, characterized in that parallel to the mixer (2) and the decoder (4) connected thereto, one of the one with the decoder (4) connected monoflop circuit (12; 12 ') and a switch (10) connected to this switch and the mixer (2) is connected.

6. Device according to claim 5, characterized in that between the mixer (2) and the switch (10) a Ver Delay circuit (13) is interposed, the monoflop circuit (12 ') being formed by a monoflop.

7. Device according to one of claims 1 to 6, characterized in that the control line of the decoder (4) is connected directly to an amplifier (15) which in turn is connected to the mixer (2) via a delay circuit (13), wherein the amplifier (15) is connected on the output side to the mixer (2) and ensures an even level, in particular of the DTMF signals.

8. Device according to one of claims 1 to 7, characterized in that a Tongenera¬ gate (16) is connected to the output of the decoder (4) or a downstream 4-Bi t binary decoder (5), a switch ( 10) is provided, which is connected to the decoder (4), the tone generator (16) and the mixer (2), the switch (10) optionally being the tone generator (16) or connected to the mixer (2) Delay circuit (13) connects to an input of the mixer (2), the control connection of the switch (10ι) being connected to the decoder (4).

9. Device according to claim 8, characterized in that the tone generator (16) sends the signal generated by it with a delay.

10. Device according to one of claims 1 to 9, characterized in that the decoder (4) is connected to a monoflop (14) which normalizes the duration of the signals emitted by the decoder (4).