RU22037U1 - DEVICE OF ACTIVE SUPPRESSION OF EXTERNAL NOISE - Google Patents

Abstract

1. A device for actively suppressing external noise reaching the eardrum, comprising a headphone plug covering the operator’s ear, in which a sound-emitting telephone capsule and a feedback microphone with an acoustic input are installed, installed near the diaphragm of said telephone capsule, characterized in that in said headphone plug The telephone has a microphone input extension tube, one end of which is mounted on the acoustic input of the feedback microphone and the other c, located near the eardrum, is mounted on a support rest installed in the ear canal of the operator’s ear. 2. A device for actively suppressing external noise reaching the eardrum according to claim 1, characterized in that the backrest has through-holes-passages of the acoustic signal. The device for actively suppressing external noise reaching the eardrum according to claims 1 and 2, characterized in that the lunette is made as a unit with the extension tube of the microphone input. 4. A device for actively suppressing external noise reaching the eardrum according to claim 1, characterized in that the extension tube is flexible and elastic.

Description

IPC A61F 11/00; H04R 1 / 00.10; GIOK 11/16 DEVICE FOR ACTIVE SUPPRESSION OF EXTERNAL NOISE.

The proposed technical solution relates to active noise canceling devices for external noise reaching the eardrum, in particular, in audio audio transmission devices, for example, in plugs of headphones and telephone / microphone headsets, as well as in hearing protection devices in the form of plugs placed around the ear when working in conditions of strong noise, creating a risk of hearing damage and interference with work. Suppression of external noise increases intelligibility in communication systems, the quality and comfort of listening to audio information for any purpose. (A63 F11 / .; H04R 1 / 00.10; G10K 11/16).

An analogue of the proposed technical solution is the device described in US patent N.C. 381 72, IPC A61F11 / 02 No. 483719. (Patent equivalent to PCT FR / 87/00056) “Method and apparatus for suppressing external noise reaching the eardrum, with improved intelligibility of electro-acoustic communication. This patent proposes a headphone in which a telephone capsule emitting sound information is installed inside a plug covering the ear. A feedback microphone is installed in the ear canal, covered by the above-mentioned plug with a telephone capsule, near the eardrum. This microphone picks up the noise that has reached the eardrum, converts it to the corresponding electrical signal, which is further amplified, filtered by the filter from the desired signal, phase-shifted so that the phase of the signal is shifted by IBO with respect to the noise signal arriving at the eardrum to a telephone capsule that converts said electrical signal into an acoustic one. This acoustic signal

develops with external noise affecting the eardrum. Since the noise and the acoustic signal from the telephone capsule are in antiphase, when they are added, there is a significant suppression of external noise reaching the eardrum.

The disadvantage of this analogue is that the feedback microphone, along with the installation tools, occupies a significant part of the ear canal, preventing the passage of a useful acoustic signal from the telephone capsule and introducing distortions into it. Another disadvantage of the analogue is the complexity of the ergonomically acceptable installation of a feedback microphone in the ear canal: when the plug is displaced with a telephone capsule on the operator’s head, the microphone mixes inside the ear canal, which causes the operator unpleasant sensations.

The next disadvantage of the analogue is the difficulty of providing a feedback microphone wired from dead sulfur with its subsequent cleaning from the mentioned ear wax.

Another analogue, the prototype of the claimed technical solution, is the device described in Europatent EP 0208389 IPC HO4 R 1/10 of 03/07/86, the initial application in the United States No. 749 575 of 06/27/83 (claimed in Germany, France and England). This patent describes a device in which a feedback microphone is mounted close to the diaphragm (membrane) of a telephone radiating capsule of a headphone or a telephone-microphone headset. This phone capsule and microphone are located inside the plug covering the ear of the operator. The action of the active noise canceling system is the same as described for the previous analogue.

The disadvantage of this prototype is that active noise reduction is performed near the diaphragm (membrane) of the telephone capsule, as a result of which noise reduction is reduced in areas remote from the diaphragm of the telephone capsule, including near the ear drum of the operator, since the phase shift between noise and suppress; they have an antiphase acoustic signal not equal to 180.

The purpose of the proposed technical solution is to eliminate the specified disadvantage of the prototype and to provide a phase shift between external noise reaching the eardrum and the noise-canceling acoustic signal of the phase shift 1SO.

This goal is achieved by the fact that in the plug of the headphone, covering the operator’s ear and containing a sound-emitting telephone capsule and feedback microphone, installed near the diaphragm of the said telephone capsule, a flexible elastic extension tube is installed for the microphone input, one end of which is mounted on the acoustic input of the feedback microphone and the second end is located near the eardrum of the ear of the operator. Said second end of the microphone input extension tube is mounted in the ear canal of the operator on a supporting rest, having through holes to ensure the passage of a useful acoustic signal from the sound-emitting telephone capsule to the eardrum.,

Thus, the claimed device allows you to suppress external acoustic noise by an out-of-phase acoustic signal directly near the eardrum, which increases the activity of noise reduction (relative to the prototype).

In addition, the ability to protect the microphone input from clogging with earwax and cleaning the microphone extension tube from the sulfur is simplified, including the simple replacement of one extension tube with another.

In the absence of the supply of a useful signal (connected or otherwise) to the telephone capsule, such a system more effectively suppresses external noise in relation to a conventional passive noise canceling plug.

The list of drawings, explaining the essence of the technical solution.

FIG. 1. Device for the active suppression of external noise.

Figure 2. Support rest.

Fig.Z. The reference lunette, made as a unit with the tube extension microphone input.

Figure 4. The claimed device for actively suppressing external noise reaching the eardrum (1) contains a plug (2) of the headphone, covering the ear of the operator. The cap can be mounted on the headband, in a helmet or on a helmet (not shown).

A sound-emitting telephone capsule (3) is installed inside the plug (2), to which an electric cable (4) is connected for supplying to the telephone capsule (3) the corresponding electric communication or other audio signal. Inside the plug (2) near the telephone capsule (3), a feedback microphone (5) is installed with an acoustic input (6), to which an electric cable (7) is connected to remove the feedback electric signal from the microphone.

The extension tube (8) of the acoustic input (6) is installed at one end (9) on the acoustic input (6) of the feedback microphone (5). The other end (10) of the extension tube (8) is located near the eardrum (1) of the operator’s ear.

A support rest (12) is installed inside the ear canal (I), which has through holes (13) that ensure the passage of a useful acoustic signal from the telephone capsule to the eardrum. The tube (8) rests on a supporting rest (12), on its supporting protrusions (14). The lunette (12) with protrusions (14) and through holes (13) can be made as a unit with the extension tube (8) of the acoustic input (6) of the microphone (5). The extension tube (8) is flexible and resilient.

The proposed device actively suppresses external noise that has reached the eardrum, as follows.

External noise, reaching the eardrum (1) through the plug (2), its body, through leaks arising between the operator’s head and the aforementioned plug or otherwise, pass into the microphone (5) through the end (10) of the extension tube (8) and microphone input (6). Since the end (10) of the tube (8) is located directly near the eardrum (1), the microphone (5) converts external noise acting directly on the eardrum (1) into the corresponding electrical signal, and transfers it to the input of the electronic unit (not shown), amplifying this signal, filtering out a useful acoustic (connected or other audio signal). The amplified and filtered electrical signal by means of the said electronic unit (not shown) changes its phi1zu by 180 ° and is supplied to the electrical input of the said telephone capsule (3), which converts it into a corresponding acoustic signal whose phase is shifted by 180 ° relative to the phase of external noise affecting the eardrum.

The support rest (12) with displacements of the plug (2) relative to the operator’s ear (uneven installation; movements with head movements, etc.) fixes the position of the extension tube (2) relative to the ear canal and the eardrum (1).

If the extension tube (8) of the microphone input (6) is clogged with earwax, this tube is easily cleaned of sulfur without risk of damage to the microphone (5): it is easily removed from the microphone input (6). If necessary, it can be replaced with a new pipe1 $ y-extension cord.

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Other features of the claimed technical solution have not been investigated.

Claims (4)

1. A device for actively suppressing external noise reaching the eardrum, comprising a headphone plug covering the operator’s ear, in which a sound-emitting telephone capsule and a feedback microphone with an acoustic input are installed, installed near the diaphragm of said telephone capsule, characterized in that in said headphone plug The telephone has a microphone input extension tube, one end of which is mounted on the acoustic input of the feedback microphone and the other C, located near the tympanic membrane, is installed on the backrest installed in the ear canal of the operator’s ear.  2. The device for actively suppressing external noise reaching the eardrum, according to claim 1, characterized in that the backrest has through holes-passages of the acoustic signal.  3. The device for actively suppressing external noise reaching the eardrum, according to claims 1 and 2, characterized in that the lunette is made as a unit with the extension tube of the microphone input. 4. The device for actively suppressing external noise reaching the eardrum according to claim 1, characterized in that the extension tube is flexible and elastic.