US1715831A - Arrangement for eliminating disturbances in receiving sound waves - Google Patents

Description

June 4, 1929, Y w, HAHNEMANN 1,715,831

ARRANGEMENT FOR ELIHINATING DISTURBANCES IN RECEIVING' SOUND WAVES Filed July 21. 1921 I n im Patented June 4;', 1929.

UNITED STATES AVVAL'IIIEIB. HAHNEMANN, 0F KITZBERG, NEAR KIEL, GERMANY, ASSIGNOR TO SIGNAL' I GESELLSCHAFT M. B. H., F KIEL'GERMANY.

.ABRANGEMENT FQR ELUIINATING DISTURBANCES RCEIVIN G SOUND WAVES.

Application led Julyn '21,' 1921, Serial No. 486,568, and in Germany Aprily 3, 1920.4

This invention relates in general'to an arrangement for eliminating disturbances in receiving sound waves, or noises which posv Sess the characteristics of a tone of any kind.

The invention relates more articularl to an arran ement for eliminatmg distur ing sounds w en receivingsound signals with the aid of submarine sound receivers in which the sound that is received by a radiating. member (such as a diaphragm) abutting on the water is transmitted through an air chamber to the sound conductor leading to the operators position. The said eliminating arrangement consists in interposing, in the '15 path along which the sound travels from the radiating member to the ear of the operator,`

achamber adapted to cooperate with a member tuned to the sound tobe received and equi ped with a' sound damping means. To

zo ren er a chamber of thiskind more eiective it is tuned in accordance with the'invention to the frefpiency of vibration of the signals to be received. An. advantageous manner' of tuning the said chamber consists in propz5 erly dimensioning its length.

The invention 1s illustrated in the drawing in which Fig. 1 is a diagrammatic longitudinal seeton of a receiving device with a disturbl ance-eliminating-chamber arranged to cooperate with a diaphragm attached to a microphone,

Fig. 2, is a similar representation except that the disturbance-eliminating chamber cooperates with a spherical resonator, and

Fig. 3 shows a receiving device with an eliminating chamber provided with adjust'- able lateral perforations for tuning purposes.

The arrangements shown in the three ligu res each comprise a radiating member or sound receiving diaphragm 1 that abuts on the external sound propagating medium through which the sound waves arrive. Adjoining the diaphragm 1 is a chamber 2 filled .15 with air and preferably of extremely small size. This chamber 2 acts as an acoustic link or sound transferring means.y In Figs. 1 and 2 the disturbance-eliminating chamber 4 connected to the chamber 2 is the next acoustic link in the chain of soundv transferring members. In the devices illustrated the sound waves that pass through thechamber" 4 are damped by a linin 5` in this chamber -composed of sound absor in material (for example, felt). Adjoining e chamber 4 in Fig. 1 is a vibratory diaphragm 6 which is tuned to the sound to be received and carries a microphone 7. The latter is connected by wires 8 and 9 to the telephone receiver 14.

In the modification illustrated in Fig. 2 the 60 chamber 4 at the rear terminates. in' a rigid A plate. Through an opening 10 in this plate the chamber. 4 is connected to a spherical resonator 11 to which is joined the sound conductor or pipe 12 that conducts the sound to the `operators position 15. v

` In Fig. 3 the sound pipe 12 is located between the external receiver 1, 2, 3 and the damping chamber 4. In this latter the disturbing vibrations are eliminated not'only by a-damping lining 5 but also by holes 13 which, particularly in cases of low tones, are very effective. The perforations 13 may be divided into groupsof various sizes and a slide valve may be provided by which the perforations may be changed according to the frequency of vibrations of the disturbing sounds.

The field of application for such means for ltering or sifting out disturbing vibrations is, of course, exceedingly large. They are specially important in cases where tones, or noises resembling tones, are received from water; because 1n such cases, particularly on account of the ear not being accustomed to distinguish between different sounds propagated through water, the elimination of disturbances'is especially important. Itwill be obvious that a plurality of such devices may be used in one and the same sound-conductor '90 or chain of -acoustic links. By dimensioning thesound eliminating chamber in a s ecial way the elimination of certain requencies of vibration or certain groups of such frequencies can be made to be more pronounced.

The term vibratory body, as used in the claims, is intended to cover not only a body such as a diaphragm but also a body of gas; while the term tuned is intended tomean that the tuned body operates in its natural frequency.

I claim 1. A sound receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an operators observing device, and sound ltering means .interposed in the sound path between the chamber having auxiliary means for dissipating undesired vibrations and a tuned vibratory body cooperating with said chamber.

2. A sound receivlng arrangement, comprising a sound receiving member abutting on the sound propagatin medium, an operators observing device, an sound filtering means interposed in the sound path between said sound receiving member and the observing device, the sound filtering means comprising a chamber having auxiliary means for dissipating undesired vibrations and a tuned diaphragm cooperating with said chamber.

3. A sound receiving arrangement, comp rising a sound receiving member abutting on the sound propagating medium, an operatois observing device, and sound filtering means interposed in the sound path between the sound receiving member 'and the observing device, the sound filtering means comprising a chamber .having auxiliary means for dissipating' undesired vibrations and a tuned diaphragm cooperating with said chamber, and a microphone cooperating with said tuned diaphragm.

LA sound receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an operators'observing device, and sound filtering means interposed in the sound path between the sound receiving member and the observing device, the sound filtering means comprising a chamber having a sound absorbing wall for dissipating undesired vibrations and a tuned vibratory body cooperating with said chamber.

5. A sound receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an operators observing device, and sound filtering means interposed in the sound path between the sound receiving member and the observing device, the sound filtering means comprising a tuned chamber having auxiliary means for dissipating undesired vibrations.

6. A sound receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an operators observing device, and sound filtering means interposed in the sound path between the sound receiving member and the observing device, the sound filtering means comprising a 4tuned chamber having a sound absorbing wall and provided with perforations.

7. A sound "receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an operators observing device, and sound filtering means interposed in the sound path between the sound receiving member and the observing device, the sound filtering means comprising a tuned chamber having a sound absorbing wall and provided with perforations and means for varying the extent of said perforations.

8. A sound receiving arrangement, com'- prising a sound receiving member abutting on the sound propagating medium, an operators observing device, and sound filtering means interposed in the sound path between said sound receiving member and said observing device, the sound filtering means comprising a tuned chamber having auxiliary means for dissipating undesired vibrations and a' tuned vibratory body cooperating with said cham- 9. A sound receiving arrangement, comprising a sound receiving member abutting on the sound propagating medium, an extremely small and flat gas Vchamber adjoining the' said receiving member, an operators 'observing device, and sound filtering means interposed in the sound path between said gas chamber and said observing device and comprising a tuned body including means for dissipating undesired vibrations.

10. A sound filtering device, comprising a tuned body including means fior dissipating undesired vibrations. 'Y A 11. A sound filtering device, comprising a tuned resonating chamber yprovided with apertures for dissipating undesired vibrations.

12. A sound filtering device, comprising a tuned resonating chamber provided with a sound absorbing Wall and with apertures for dissipating undesired vibrations.

13. A sound filtering device, comprising a chamber having means for dissipating undesired vibrations, and a tuned diaphragm in sound transferring relation with said chamber.

14. A sound filtering device,.comprising a tuned resonating chamber having auxiliary means for dissipating undesired vibrations, and a tuned diaphragm in sound transferring relation with said chamber.

, In testimony whereof I affix my signature.

WALTER HAHNMANN.

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