CN2174012Y

CN2174012Y - All-band noise-proof wireless communicator

Info

Publication number: CN2174012Y
Application number: CN 93231445
Authority: CN
Inventors: 林俊轩; 李江吉; 卫孝泉; 崔国霖
Original assignee: Ocean University of Oingdao
Current assignee: Ocean University of Oingdao
Priority date: 1993-07-21
Filing date: 1993-07-21
Publication date: 1994-08-10
Anticipated expiration: 2003-07-21

Abstract

The utility model relates to an all-band wireless communicator under the strong noise environment. The all-band wireless communicator is composed of a noise-proof piezoelectric sensor especially made of PZT piezoceramic material, a received transmitting device with high frequency compensation and automatic gain amplifiers, earphones arranged in sound insulation ear hoods, etc. The all-band wireless communicator can effectively suppress noise, acquire clear speech intelligibility in the strong noise environment, and realize all-band high fidelity. The utility model has the advantages of simple structure, small size, and convenient operation. The all-band wireless communicator is an ideal and novel talking speakerphone in the strong noise environment.

Description

All-band noise-proof wireless communicator

A kind of full frequency band wireless communication device that relates under the strong noise environment situation.

Among strong noise environment, good wireless communication device must possess two primary conditions at least: the promptly good noise robustness and the intelligibility of speech clearly.The former solves substantially, and still there are a lot of difficulties in the latter.Therefore; in noise (particularly more than the about 100dBA of very noisy) environment; can protect hearing can carry out the talkback unit of language talk again freely; be still people and expect one of difficult problem that solves for a long time; although since the seventies; the U.S.; Sweden; Japan and North Atlantic Treaty Organization(NATO) etc. develop various protection against noise conversation ear shield devices in succession; but the communication ear shield device that the research of this respect of carrying out both at home and abroad still is limited to wired mode or do to converse under the noise circumstance of certain frequency range; so far fail to reach and suppress the full frequency band noise and send language, and have the requirement of the intelligibility of speech clearly.The deadly defect that is existing noise control communicator is to eliminate the noise of language full frequency band and wired mode of employing cable connection receiver etc., makes the wearer handicapped, thereby limits its scope of application greatly.

The purpose of this utility model is to overcome above shortcoming, and a kind of high-performance device that makes things convenient for that carries out wireless communication in strong noise environment is provided.

The utility model is to implement like this: with the special antinoise pick-up transducer of PZT piezoceramic material, be close to neck larynx mastoid process one side by elastic fulcrum bar, utilize the transaudient principle of bone conduction, the phonetic sound that the detects signal that shakes is amplified, send into transmitter then and launch, as shown in Figure 1 through antenna.Equally, by common antenna with received signal through receiver, have the amplifier of high frequency compensation and automatic gain control, send into the insert earphone of sound insulation in the earmuff of wearing that place and can hear.Whole apparatus structure is simple, miniaturization, cost are low, and combines on the conversation earmuff.

In order effectively in high-noise environment, to obtain the intelligibility of speech clearly, at least signal to noise ratio (S/N) should be higher than 30dB, antinoise transducer of the present utility model replaces microphone, with the pick-up method my the transaudient signal of bone conduction of speech is sent into transmitter as microphone, owing to do not match at the air middle impedance, sensitivity is extremely low, enters radiating circuit so suppressed noise greatly; Consider that simultaneously the transaudient meeting of bone conduction makes the loss of signal radio-frequency component serious, for realizing the full frequency band high fidelity, has increased high frequency compensation in automatic gain amplifier.In addition, when I talked, crossing dare not speak up by force for the sound of avoiding oneself influenced the operate as normal of transmitter, presented one by preamplifier this moment and suppressed signal amplifier gain is reduced, and had so far satisfactorily solved speech articulation effectively.

Provide embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Description of drawings

The structural representation of this device of Fig. 1

The electric functional-block diagram of this device of Fig. 2

Fig. 3 antinoise pick-up transducer cross-sectional view

Wherein, 1. transducer; 2. preamplifier; 3. transmitter; 4. receiver; 5. high frequency compensation amplifier;

6. insert earphone; 7. antenna; 8. earmuff shelf; 9. adjusting knob; 10. sound insulation earmuff; 11. sound-absorbing material;

12. elastic washer; 13. locking button; 14. universal joint; 15. curved bar; 16. lead-in wire; 17. piezoelectric device;

18. vibrating diaphragm; 19. aluminium shell

As shown in Figure 1, the sound insulation earmuff 10 that this device is mainly connect by earmuff shelf 8, and be fixed in 6, one antinoise transducers 1 of insert earphone of its central part and launch wireless communication apparatus via the reception of community antenna 7.

The main body of the sensor 1 is a piezoceramic material system; piezoelectric device 17 to the transaudient sensitivity of bone conduction; this piezoelectric device 17 is close to vibrating diaphragm 18; and realize being electrically connected; and a duralumin shell 19 that shields is arranged; vibrating diaphragm 18 is the conducting metal diaphragm; choose copper alloy and piezoelectric coupling; lead-in wire 16 is electrically connected on respectively on this sheet and the piezoelectric device other end; and introduce the input of preamplifiers 2 via the curved bar 15 of hollow; save 14 link joints by direction between curved bar 15 and the transducer 1, so that transducer 1 conveniently is close to larynx mastoid process position.

Above-mentioned sound insulation earmuff 10 considers that sound insulation and absorbent properties are good, and the sound-absorbing material 11 of all sidelinings is a polyurethane foam material.Consider the seal of earmuff 10 and auricle again and comfortablely when wearing to alleviate greatly pressure around the external ear is caused pain, its elastic washer 12 is the synthetic leather cavity volume structures of filling drier oil in as the outer of earmuff 10.

Above-mentioned receiving and transmitting unit is made up of transmitter 3 and the high frequency compensation amplifier 5 that includes automatic gain control and receiver 4 and reception emission common antenna 7, received signal is amplified via receiver 4 by rod-pulling type antenna 7, consider that transducer is the transaudient signal of pick-up bone conduction, its high-frequency audio composition loss is serious, fidelity is descended, so after receiver 4, set up the high frequency compensation amplifier 5 of high frequency compensation function, in addition in order to reduce the hyperphonia of hearing oneself when talking, thereby do not dare to say aloud words and influence the operate as normal of transmitter 3, also present one and suppress signal by preamplifier 2, see Fig. 2, the gain of high frequency compensation amplifier 5 is reduced, and introduce automatic gain amplifier wherein.Above-mentioned receiving and transmitting unit integrated microization makes that this apparatus structure is light, volume is little, has improved signal to noise ratio greatly, has guaranteed the intelligibility of speech clearly.

In sum, the utility model is simple in structure, volume is little, cost is low, easy to use, is novel communicating talkback device desirable in the strong noise environment.

Claims

1, a kind of full frequency band anti-noise wireless communicator, it is by transducer 1, receiving and transmitting unit that preamplifier 2 and transmitter 3 and receiver 4 are formed and insert earphone 6 formations that place in the sound insulation earmuff 10 is characterized in that:

A. transducer 1 is by the piezoelectric device 17 to the transaudient sensitivity of bone conduction, and is close to and vibrating diaphragm of realizing being electrically connected 18 and the duralumin shell composition that shields with it;

B. the earmuff 10 all sidelining sound-absorbing materials 11 that insulate against sound, the earmuff outer that contacts with auricle is an elastic washer 12.

2, wireless communication device according to claim 1 is characterized in that antinoise piezoelectric device 17 is to be made by piezoceramic material.

3, wireless communication device according to claim 1 is characterized in that elastic washer 12 is the synthetic leather cavity volumes that fill drier oil in.