CN205195955U - Wave filter of active noise reduction ear muff - Google Patents
Wave filter of active noise reduction ear muff Download PDFInfo
- Publication number
- CN205195955U CN205195955U CN201520977079.3U CN201520977079U CN205195955U CN 205195955 U CN205195955 U CN 205195955U CN 201520977079 U CN201520977079 U CN 201520977079U CN 205195955 U CN205195955 U CN 205195955U
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- Prior art keywords
- circuit
- microphone
- filter
- active noise
- noise reduction
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- Expired - Fee Related
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The utility model relates to a wave filter of active noise reduction ear muff, including embedded in the ear muff the microphone, make an uproar circuit and speaker fall, the microphone, fall make an uproar circuit and speaker and connect gradually, fall and make an uproar the circuit including the preprocessing circuit, filter circuit and the drive amplifier circuit that connect gradually, preprocessing circuit be connected with the microphone, drive amplifier circuit be connected with the speaker. Compared with the prior art, the utility model has the advantages of the noise reduction effect is good, the function is many, the practicality is strong.
Description
Technical field
The utility model relates to a kind of noise reduction earflap, especially relates to a kind of filter of Active Noise-reduction Earmuff.
Background technology
Noise reduction earflap can effective restraint speckle, the scope that the noise reduction in strong noise environment allows to people's ear, is widely used in civilian or military domain.Noise reduction earflap is mainly divided into two classes according to operation principle: passive noise reduction (PassiveNoise-Canceling) and active noise reduction (ActiveNoise-Canceling, be abbreviated as ANC) earmuff, the former is by the acoustic material in earmuff or special construction, as far as possible noise insulation; Latter is embedded with special Dolby circuit in earmuff, realizes noise reduction function.In ANC realizes, the principle realized by Dolby circuit can be divided into again FEEDBACK CONTROL type and feedfoward control type, the feature that the structure that feedfoward control type has is simple and reliable and stable and being widely used.But the defects such as existing earmuff ubiquity noise reduction.
Utility model content
The purpose of this utility model is exactly the filter in order to overcome defect that above-mentioned prior art exists and the Active Noise-reduction Earmuff that provides a kind of excellent noise reduction effect, function many, practical.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of filter of Active Noise-reduction Earmuff, it is characterized in that, comprise the microphone be embedded in earmuff, Dolby circuit and loud speaker, described microphone, Dolby circuit are connected successively with loud speaker, described Dolby circuit comprises the pre-process circuit, filter circuit and the drive amplification circuit that connect successively, described pre-process circuit is connected with microphone, and described drive amplification circuit is connected with loud speaker.
Described microphone is mini microphone.
Described pre-process circuit comprises clipping unit and automatic gain control unit.
Described filter circuit is active noise reduction AS3501 chip.
Also comprise external audio frequency signal input interface, this interface is connected between drive amplification circuit and loud speaker.
Compared with prior art, the utility model has the following advantages:
1) excellent noise reduction effect, the mini microphone be placed in earmuff gathers ambient noise, noise signal is after the Dolby circuit in earmuff processes in real time, contrary with noise phase, that amplitude is identical sound wave is there is and offsets noise in the signal produced by loud speaker, thus people's ear can feel that acoustic noise reducing even disappears, thus substantially increase noise reduction.
2) function is many, except decrease of noise functions, having external audio frequency signal input part, may be used for the functions such as voice messaging input by increasing;
3) practical, reasonable in design, muff-style designs is practical.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
As shown in Figure 1, a kind of filter of Active Noise-reduction Earmuff, comprise the microphone 2 be embedded in earmuff 1, Dolby circuit 4, loud speaker 3 and external audio frequency signal input interface 5, described microphone 2, Dolby circuit 4 are connected successively with loud speaker 3, described Dolby circuit 4 comprises the pre-process circuit 41, filter circuit 42 and the drive amplification circuit 43 that connect successively, described pre-process circuit 41 is connected with microphone 2, described drive amplification circuit 43 is connected with loud speaker 3, and described external audio frequency signal input connects 5 mouthfuls and is connected between drive amplification circuit and loud speaker.
Described microphone is mini microphone.Described pre-process circuit comprises clipping unit and automatic gain control unit.Described filter circuit is active noise reduction AS3501 chip.
The mini microphone be placed in earmuff gathers ambient noise, noise signal is after the Dolby circuit in earmuff processes in real time, there is contrary with noise phase, that amplitude is identical sound wave by loud speaker and offset noise in the signal produced, thus people's ear can feel that acoustic noise reducing even disappears.
According to feed forward control techniques principle, the present invention adopts the signal processing flow figure shown in Fig. 1, microphone signal is first through amplitude limit and automatic growth control pre-process circuit, again through the noise reducing treatment circuit (being filter circuit in essence) of core, finally by loudspeaker driving circuit, export the voice signal close with noise phase opposite magnitude by loud speaker, reach the object reducing noise.Increase in figure and have external audio frequency signal input interface, may be used for the functions such as voice messaging input.
Claims (5)
1. the filter of an Active Noise-reduction Earmuff, it is characterized in that, comprise the microphone be embedded in earmuff, Dolby circuit and loud speaker, described microphone, Dolby circuit are connected successively with loud speaker, described Dolby circuit comprises the pre-process circuit, filter circuit and the drive amplification circuit that connect successively, described pre-process circuit is connected with microphone, and described drive amplification circuit is connected with loud speaker.
2. the filter of a kind of Active Noise-reduction Earmuff according to claim 1, is characterized in that, described microphone is mini microphone.
3. the filter of a kind of Active Noise-reduction Earmuff according to claim 1, is characterized in that, described pre-process circuit comprises clipping unit and automatic gain control unit.
4. the filter of a kind of Active Noise-reduction Earmuff according to claim 1, is characterized in that, described filter circuit is active noise reduction AS3501 chip.
5. the filter of a kind of Active Noise-reduction Earmuff according to claim 1, is characterized in that, also comprises external audio frequency signal input interface, and this interface is connected between drive amplification circuit and loud speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520977079.3U CN205195955U (en) | 2015-11-30 | 2015-11-30 | Wave filter of active noise reduction ear muff |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520977079.3U CN205195955U (en) | 2015-11-30 | 2015-11-30 | Wave filter of active noise reduction ear muff |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205195955U true CN205195955U (en) | 2016-04-27 |
Family
ID=55788889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520977079.3U Expired - Fee Related CN205195955U (en) | 2015-11-30 | 2015-11-30 | Wave filter of active noise reduction ear muff |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205195955U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792316A (en) * | 2017-01-10 | 2017-05-31 | 南京航空航天大学 | A kind of industrial active noise reduction earmuff |
-
2015
- 2015-11-30 CN CN201520977079.3U patent/CN205195955U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792316A (en) * | 2017-01-10 | 2017-05-31 | 南京航空航天大学 | A kind of industrial active noise reduction earmuff |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160427 Termination date: 20191130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |