RU22039U1 - HEADPHONE WITH ACTIVE NOISE REDUCTION SYSTEM - Google Patents

Abstract

1. A headphone with an active noise canceling system, containing plugs that isolate the operator’s ears from the external environment, each of which has a sound-emitting telephone capsule of a connected acoustic signal, a feedback microphone for perceiving a noise acoustic signal penetrating the cavity of the plug, a sound-emitting noise-canceling telephone capsule emitting into the cavity of the plug antiphase noise-canceling acoustic feedback signal, characterized in that the said sound-emitting telephone capsule l of the connected acoustic signal, the sound-emitting noise canceling telephone capsule and feedback microphone are mounted on separate supports. 2. A headphone with an active noise reduction system according to claim 1, characterized in that the said supports are mounted on the plug case. 3. A headphone with an active noise reduction system according to claim 1, characterized in that the said supports are acoustically isolated from the housing of the plug. A headphone with an active noise reduction system according to claim 1, characterized in that the sound-emitting telephone noise canceling capsule is mounted on its hinge support.

Description

HEADPHONE WITH SYSTEM

ACTIVE NOISE REDUCTION.

The claimed technical solution relates to the technique of headphones and telephone-microphone headsets for listening to audio information, including voice communication information, in conditions of external noise affecting the hearing organs through the eardrum, in particular, to headphones and telephone-microphone headsets equipped with an active .. noise reduction system (IPC: A61F 11 /, G 10K 11/16, H04R 1 / 10.3 / 00).

Several analogues of the claimed technical solution are known. This is, firstly, the technical solution described in the patent of England No. 2172 769, IPC H04R3 / 00 dated 03.17.86, made by The Plessey Overseas Ltd (England). This patent describes a device where a feedback microphone is installed in the plugs of the headphone (each one) together with a sound-emitting telephone capsule, which senses a noise acoustic signal passing into the inside of the stub and affecting the hearing organ, converts it into an electrical signal with a corresponding amplitude -frequency response. This electrical signal is amplified by an amplifier and processed by an electronic filter. The phase of the mentioned electrical signal is shifted by 18 about. In this used form, the electric signal is fed to the sound-emitting telephone capsule, which converts it into an acoustic signal that matches the noise acoustic signal in frequency and amplitude, but is phase shifted relative to it by phase 180. Adding to the mentioned noise signal, it significantly suppresses the acoustic noise signal.

IPC A61F11 /; G10K11 / 16, H04R3 /, 1/10.

The disadvantage of this analogue is that at a high level of a noise signal (namely, such signals should be suppressed), a signal arrives at the telephone sound-emitting capsule whose voltage amplitude and power exceed the allowable level of the telephone capsule, which leads to distortions of the useful (connected) signal and deterioration in intelligibility, as well as insufficiently effective noise reduction.

The closest analogue (prototype) to the claimed technical solution is the industrial-manufactured telephone and microphone headset "RA315" I1 tank helmet system (IHS) of the company "RAKAL ACOUSTICS Ltd (England), described in the brochure of the company" RA 315 Integrated (http: www racalacoustics co.uk / Ra 315 htm). In this model, two sound-emitting telephone capsules and a feedback microphone of the active noise reduction system are installed in each plug of the headphone. One sound-emitting telephone capsule is connected directly to the communication system and emits a connected acoustic signal.

The noise-canceling antiphase acoustic signal is supplied to an active noise-canceling system consisting of a feedback microphone connected through an amplifier, a filter, and a phase-shifting device to said second sound-emitting telephone capsule.

The disadvantage of the prototype is that both telephone sound-emitting capsule and feedback microphone are installed on a single base board; the resonance frequency range of this board is wide enough and sufficiently covers the frequency range of the noise. The resonance excited by the anti-noise signal in this board mixes the phase shift of the anti-noise signal, which reduces the noise reduction effect. In addition, this board transmits a mechanical signal to a sound-emitting telephone capsule, which emits a connected acoustic signal, which begins to emit a noise-canceling acoustic signal that is phase shifted relative to the main noise-canceling signal, which also reduces, ultimately, noise reduction. When trying to fit (reinstall) the noise canceling telephone capsule

noise reduction performance may be further reduced.

The purpose of the proposed technical solution is to eliminate the disadvantages of the prototype, i.e. Improving noise reduction performance.

This goal is achieved by the fact that in the headset with an active noise cancellation system containing plugs isolating the operator’s pogs from the external environment, each of which has a sound-emitting telephone capsule emitting a connected acoustic signal into the cavity of the plug: a noise canceling telephone capsule emitting an antiphase noise canceling into the plug an acoustic feedback signal and a feedback microphone, characterized in that the capsule is mounted on installation supports that are separated from each other. These mounting legs are mounted on the plug housing and are acoustically isolated from the plug housing. At the same time, the noise canceling telephone capsule is pivotally mounted on its support with the possibility of adjusting the direction of its acoustic axis.

The list of figures of the explanatory drawings.

FIG. 1. A headphone plug with a sound-emitting telephone capsule of a connected acoustic signal, a sound-emitting noise canceling telephone capsule and a feedback microphone (section) installed in it.

Figure 2. Installation of a sound-emitting telephone noise canceling capsule in the plug of the head-phone (section).

The inventive head phone with an active noise reduction system contains two plugs, each of which is installed on the headband (1). Each plug contains a housing (2), along the edge (3) of which a shock absorber roller (4) is installed. A support (5) is made inside the housing (2), to which an acoustic insulator (6) is attached, for example, of felt or other material that absorbs acoustic vibrations. A sound emitting telephone capsule (7) of a connected acoustic signal is installed on this acoustic insulator (6). An acoustic insulator (9) is mounted on the support (8) made inside the housing (2), on which a hinge (10) is mounted, on which, in turn, a sound-emitting telephone noise canceling capsule (11) is installed. The support (12) is mounted on the housing (2) and an acoustic insulator (13) is attached to it, on which a feedback microphone (14) is mounted.

The cap is mounted on the head (1) with the help of the tail support (15) mounted on the body (2). Supports (5), (12), and (1: 5) are made as a unit with the body (2) of the plug. A rod (16) is attached to the sound-emitting telephone capsule (11) for noise reduction, at the end of which (17) the handwheel (18) is permanently installed. The rod (16) extends outside the housing (2) of the plug into the cavity of the plug through the hole (19) in the housing (2); in this hole, a sealing and guide sleeve (20) is installed, covering the rod (16).

The claimed headphone with an active noise reduction system works as follows. The electrical communication signal enters the sound-emitting telephone capsule (7) of the connected acoustic signal and is converted by this capsule into the corresponding acoustic signal. Penetrating

inside the cavity, acoustic noise is perceived by the feedback microphone (14) and converted into an electric signal corresponding in frequency and amplitude, which is fed to the input of an electronic amplifier (not shown), amplified by it, and then fed to a filter (not shown), which in turn processes this signal also shifts it in phase by 180 relative to the original acoustic noise. In this form, i.e. The filtered and phase-shifted signal enters the sound-emitting telephone capsule (11), which emits an acoustic signal into the cavity of the stub matching in frequency and amplitude with acoustic noise, but phase shifted relative to it. When adding acoustic noise and said acoustic signal in antiphase, a significant suppression of acoustic noise occurs. Installation of a sound-emitting telephone capsule (11) for noise reduction, a sound-emitting telephone capsule (7) for a connected acoustic signal, and also a feedback microphone (14) on separate supports (8), (12) and (5), with separation of the said telephone capsules (11) and (7). as well as microphone (II) feedback from their supports (8), (12) and (5) using acoustic insulators (9), (6) and (13) we significantly reduce the resonance of the housing (2) from the effect of noise-canceling acoustic signal directly from a telephone capsule (11) through a support (9); resonance of the sound-emitting telephone capsule (7) through the support (8), the housing (2) and the support (5); as well as the influence of mechanical vibrations of the support (8), the housing (2) on the feedback microphone (14). As a result, the influence of the indicated resonant phenomena and mechanical influence on the phase shift deviation of the noise-canceling acoustic signal from 180 ° decreases, all of the above leads, ultimately, to the installation on the sound-emitting telephone capsule (11) of the noise canceling rod (16) with the handwheel (18), as well as setting

the capsule (11) itself on the hinge device (10) allows the operator to rotate the sound-emitting telephone capsule (11) around the axis of the stem (16), adjusting the phase shift of the noise-canceling acoustic signal.

The claimed technical solution was tested in the enterprise, the applicant of OKB OKTA, and showed the possibility of improving noise reduction.

Claims (4)

1. A headphone with an active noise canceling system, containing plugs that isolate the operator’s ears from the external environment, each of which has a sound-emitting telephone capsule of a connected acoustic signal, a feedback microphone for perceiving a noise acoustic signal penetrating the cavity of the plug, a sound-emitting noise-canceling telephone capsule emitting into the cavity of the plug antiphase noise-canceling acoustic feedback signal, characterized in that the said sound-emitting telephone capsule l connected acoustic signal, a sound-emitting noise canceling telephone capsule and feedback microphone are mounted on separate supports.  2. The head phone with an active noise reduction system according to claim 1, characterized in that the said supports are installed on the housing of the plug.  3. The headphone with an active noise reduction system according to claim 1, characterized in that the said supports are acoustically isolated from the plug housing. 4. The headphone with an active noise reduction system according to claim 1, characterized in that the sound-emitting telephone noise canceling capsule is mounted on its support on a hinge.