CN85103511B - Active antinoise earmuff and receiver - Google Patents
Active antinoise earmuff and receiverInfo
- Publication number
- CN85103511B CN85103511B CN 85103511 CN85103511A CN85103511B CN 85103511 B CN85103511 B CN 85103511B CN 85103511 CN85103511 CN 85103511 CN 85103511 A CN85103511 A CN 85103511A CN 85103511 B CN85103511 B CN 85103511B
- Authority
- CN
- China
- Prior art keywords
- noise
- earmuff
- earphone
- microphone
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Headphones And Earphones (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention relates to the prevention of human ear noise and the communication and communication in a high noise environment. The gist of the present invention is to introduce a noise signal into a small cavity, and simultaneously pick up a noise signal in the noise field by a microphone, and the signal is compensated by amplitude compensation, phase shifting, and amplification through the earphone to reproduce and cancel the noise entering the small cavity. Anti-noise effect. The invention has the advantages of strong anti-noise ability, anti-noise frequency bandwidth, and can communicate and communicate in a high-noise environment, and is comfortable to wear. It can be used for noise defense, call and communication in workshops, cabins, airports, tanks and ships with particularly noisy noise.
Description
This invention relates to call, the communication under human ear noise defense's equipment and high-noise environment.
Cardinal principle of the present invention utilizes noise to eliminate noise exactly.At nineteen fifty-three U.S. olson, electronics acoustic filter (its principle is also to utilize noise to offset noise, J.A.S.A 1953, P1130-1136) was once proposed, its objective is near the noise that the cancellation number of people is, but can only obtain effect to the very narrow frequency band of low frequency, but can not converse and structure is very complicated, never obtain practicality.At the initial stage eighties, some countries of Europe once adopted the method for Active Noise Control in earmuff, and representative works is the research work (periodical is at Inter-Noise83, P375-378) that Essex university carries out.They have adopted a waveform synthesizer to simulate former noise to eliminate noise, also can converse, but this equipment complexity, cost are high, and can only be effective to the noise of some single-frequency composition, regulate and be easy to produce utter long and high-pitched sounds (their microphone is placed on before earphone) by this covering device.
The object of this invention is to provide in a broad frequency range, can be steady operation, miniature portable, the telephone receiver system of working under the eliminated noise earmuff that can converse and high-noise environment.
Technical scheme of the present invention is that noise signal is incorporated in a loculus, simultaneously with being exposed in noise field, and be close to the noise signal in the microphone pick-up noise field of interior earmuff, this signal goes out and the noise of the anti-phase constant amplitude of noise that enters intracavity by Headphone reproducing after amplitude compensation, phase shift, amplification, thereby cause counteracting, play antimierophonic effect.So just can directly in noise field, converse, can reach 10dB-18dB according to the signal to noise ratio of different noise spectrums, call.
If need to carry out communication, can communication signal be directly added on earphone simultaneously, at this moment can under high-noise environment, hear communication signal clearly.Also can be simultaneously with one, two earphones as noise maker, another does communication.
If also need to, in the lower work of extra high noise sound level (as exceeding 120dB), add an earmuff in the outside of this covering device.
The present invention is in 100c/s-1000c/s wide frequency ranges, and it is effective especially to have the peak noise of 2 octave bandwidths.Can be applicable to do noise defence in the workshop, cabin, airport, cabin, tank module of noise especially severe, also can be used for call under high-noise environment and the use of communication.
Brief description of the drawings and invention are implemented
Fig. 1 is device and the structure chart (construction and device that only draws people's ear one side in figure, opposite side is identical) of " active antinoise earmuff and receiver ".Microphone (1) adopts the electret microphone of non-directive, even frequency response, it is fixed on outside earmuff (5) with support (7), and make it as far as possible near the flat film earphone (6) with even frequency response, whole microphone is all exposed in noise field, and it can receive noise and call sound in noise field simultaneously.After reception, sound signal is converted to electric signal, can be in harmonious proportion continuously and there is the amplitude compensation device (2) of certain weight filtering through incoming level, again through thering is the phase shifter (3) of 0-360 ° of adjustable phase, and after amplifier (comprising power amplifier) (4), be defeated by flat film earphone (6), the back side of earphone can adopt half acoustic window material sealing, this material can make most noise directly enter in the loculus causing between earphone and people's ear, noise and the noise that enters intracavity that adjusting amplitude and phase shift simultaneously goes out Headphone reproducing offset, thereby improve the signal to noise ratio of call, obtain the object of conversing under antinoise and strong noise.As also carried out communication, only communication signal (8) directly need be added on earphone.
Fig. 2 is greater than in the situation of 120dB and uses noise level, at this moment can add in the outside of former active anti-noise system an outer earmuff (9) again, and this earmuff is to be supported on interior earmuff by elastic damping.
Claims (4)
1. an active antinoise earmuff and receiver, by microphone (1), flat film earphone (6), the compositions such as phase shifter (3), it is characterized in that earmuff makes to have loculus between earphone (6) and people's ear, microphone (1) is fixed on outside earmuff (5), and noise signal is transported to by microphone (1), amplitude compensation device (2), phase shifter (3) and amplifier (4) noise and the environment noise that earphone (6) sends phase shift and amplitude compensation and offset at intracavity.
2. according to the device of right 1, it is characterized in that the flat film earphone back side sealed by half acoustic window material.
3. according to the device of right 1 or 2, it is characterized in that the phase shift range of phase shifter is continuous adjustable at 0 °～360 °.
4. according to the device of right 1 or 2, while it is characterized in that using, can on earmuff (5), add again an outer earmuff (9) under higher than 120 decibels of environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103511 CN85103511B (en) | 1985-04-30 | 1985-04-30 | Active antinoise earmuff and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103511 CN85103511B (en) | 1985-04-30 | 1985-04-30 | Active antinoise earmuff and receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103511A CN85103511A (en) | 1986-11-05 |
| CN85103511B true CN85103511B (en) | 1987-09-16 |
Family
ID=4793243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85103511 Expired CN85103511B (en) | 1985-04-30 | 1985-04-30 | Active antinoise earmuff and receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85103511B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118667B (en) * | 2009-12-31 | 2016-05-25 | 歌尔声学股份有限公司 | Non-enclosed ear inserting type earphone and callee speech sound enhancement device thereof |
-
1985
- 1985-04-30 CN CN 85103511 patent/CN85103511B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85103511A (en) | 1986-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| PB01 | Publication | ||
| C06 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |