CN204993814U - Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit - Google Patents
Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit Download PDFInfo
- Publication number
- CN204993814U CN204993814U CN201520782884.0U CN201520782884U CN204993814U CN 204993814 U CN204993814 U CN 204993814U CN 201520782884 U CN201520782884 U CN 201520782884U CN 204993814 U CN204993814 U CN 204993814U
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- China
- Prior art keywords
- power amplifier
- noise reduction
- loudspeaker
- signal
- active noise
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- Expired - Fee Related
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Headphones And Earphones (AREA)
Abstract
The utility model discloses an initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit, this circuit include microphone, wave filter, a power amplifier, the 2nd power amplifier and loudspeaker, the microphone passes through the wave filter to be connected with a power amplifier's input electricity, just a power amplifier's output is connected to the one end of loudspeaker, the audio signal of normal broadcast inserts the 2nd power amplifier's input, and just the 2nd power amplifier's output is connected to the other end of loudspeaker. The utility model discloses the noise is independent detached with the music of normal broadcast, and all has corresponding power amplifier to handle, consequently can freely adjust music signal's frequency response, the magnification respectively and fall frequency response, the the magnification of the signal of making an uproar, need not the circuit of mutual equilibrium matching to easier design and production.
Description
Technical field
The utility model relates to a kind of active noise reduction earphone, particularly relates to a kind of active noise reduction circuit of active noise reduction earphone.
Background technology
Active noise reduction earphone, refers to collection environmental noise, and produces the device playback such as the signal earphone anti-phase with noise, in order to the technology of offset noise.The noise reduction system of typical case's active noise reduction (ANC) earphone is made up of following part: 1) in order to gather the microphone system of noise; 2) Electronic Control part, in order to processing audio signal, and generates de-noising signal; 3) horn system, in order to produce noise reducing tone signal.
Major part ANC system adopts the one in two kinds of primary structures: feed forward type or reaction type.If Fig. 2 is in feed forward type system, comprise microphone 20, filter 21, power amplifier 22 and loudspeaker 23, sampling microphone 20 is positioned at earphone outside, enters the noise of earphone in order to gather, loudspeaker in order to play inversion signal, in order to offset noise.Feedforward system is generally used for In-Ear Headphones design.If Fig. 3 is in reaction type system, comprise microphone 30, filter 31, power amplifier 32 and loudspeaker 33, Mike, 30 are positioned at earphone inside, gather so-called " error signal ", in other words, the signal that the music signal that microphone acquires normal play mixes with residual noise, after the music signal of normal play is deducted, just obtain the noise remained.By appropriate feedback circuit, the difference of error signal and normal music can be made little as much as possible, that is, reduce noise.
See from Fig. 2 and Fig. 3, no matter with feed forward type or reaction type, de-noising signal and the superposition of normal play music signal are delivered to amplifier rear drive loudspeaker and are reached noise reduction.It is different for producing the frequency response needed for normal play music signal, multiplication factor and the frequency response needed for de-noising signal, multiplication factor like this, and requirement in same amplifier will match two, debugging aspect is more difficult.
Utility model content
For the weak point existed in above-mentioned technology, the utility model provides a kind of active noise reduction circuit debugging convenient, excellent noise reduction effect and the high active noise reduction earphone of production efficiency.
For achieving the above object, the utility model provides a kind of active noise reduction circuit of active noise reduction earphone, comprise the microphone for collecting noise, for noise is carried out filtering noise reduction filter, for noise reducing tone signal is amplified the first power amplifier, for the second power amplifier of amplifying the audio signal of normal play and the loudspeaker for playing signal; Described microphone is electrically connected by the input of filter with the first power amplifier, and the output of described first power amplifier is connected to one end of loudspeaker; The audio signal of normal play accesses the input of the second power amplifier, and the output of the second power amplifier is connected to the other end of loudspeaker.
Wherein, described microphone is positioned at the outside of earphone.
Wherein, described microphone is positioned at the inside of earphone.
Wherein, described first power amplifier is by one end of data wire access loudspeaker; Described second power amplifier is by the other end of data wire access loudspeaker.
The beneficial effects of the utility model are: compared with prior art, the active noise reduction circuit of the active noise reduction earphone that the utility model provides, set up the second power amplifier that the audio signal of normal play is amplified, loudspeaker are divided into two links, one end connects the first power amplifier and carries out broadcasting reverse signal, and the other end carries out normal play music; This improvement, the music of noise and normal play is independently separated, and all have corresponding power amplifier to process, therefore the frequency response of free adjustment music signal, the frequency response of multiplication factor and de-noising signal, multiplication factor can be distinguished, without the need to mutually balancing the circuit of coupling, thus more easily design and produce.
Accompanying drawing explanation
Fig. 1 is the active noise reduction circuit diagram of active noise reduction earphone of the present utility model;
Fig. 2 is feed forward type circuit diagram of the prior art;
Fig. 3 is reaction type circuit diagram of the prior art.
Main element symbol description is as follows:
10, microphone 11, filter
12, the first power amplifier 13, loudspeaker
14, the second power amplifier
20, microphone 21, filter
22, power amplifier 23, loudspeaker
30, microphone 31, filter
32, power amplifier 33, loudspeaker.
Embodiment
In order to more clearly state the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Refer to Fig. 1, the active noise reduction circuit of active noise reduction earphone of the present utility model, comprise the microphone 10 for collecting noise, for noise is carried out filtering noise reduction filter 11, for noise reducing tone signal is amplified the first power amplifier 12, for the second power amplifier 14 of amplifying the audio signal of normal play and the loudspeaker 13 for playing signal; Microphone 10 is electrically connected with the input of the first power amplifier 12 by filter 11, and the output of the first power amplifier 12 is connected to one end of loudspeaker 13; The audio signal of normal play accesses the input of the second power amplifier 14, and the output of the second power amplifier 14 is connected to the other end of loudspeaker 13; The audio signal of normal play, the input audio signal namely in this circuit; Microphone 10 collection enters the noise of earphone, this noise signal produces noise reducing tone signal after filtering 11 ripple noise reductions by filter, noise reducing tone signal delivers to 13 one end of loudspeaker after being amplified by the first power amplifier 12, broadcasting reverse signal is carried out in one end of loudspeaker 13; The audio signal of normal play is by delivering to the other end of loudspeaker 13 after the second power amplifier 14 amplification, normal play music is carried out in one end of loudspeaker 13.
Compared to the situation of prior art, the active noise reduction circuit of the active noise reduction earphone that the utility model provides, set up the second power amplifier 14 that the audio signal of normal play is amplified, loudspeaker 13 are divided into two links, one end connects the first power amplifier 12 and carries out broadcasting reverse signal, and the other end carries out normal play music; This improvement, the music of noise and normal play is independently separated, and all have corresponding power amplifier to process, therefore the frequency response of free adjustment music signal, the frequency response of multiplication factor and de-noising signal, multiplication factor can be distinguished, without the need to mutually balancing the circuit of coupling, thus more easily design and produce.
In the present embodiment, microphone 10 is positioned at the outside of earphone, and certainly, microphone 10 also can be positioned at the inside of earphone.Owing to adding the second power amplifier in this case, therefore the position of microphone 10 is not very important, and therefore microphone 10 also can be placed in earphone inside, and certainly, microphone 10 can also be distributed on other positions of earphone.If the change to microphone 10 position, all belong to the simple deformation to this case or conversion, fall in the protection range of this case.
In the present embodiment, the first power amplifier 12 is by one end of data wire access loudspeaker 13; Second power amplifier 14 is by the other end of data wire access loudspeaker 13.First power amplifier 12 and the second power amplifier 14 are mutually independently.The audio signal of noise reducing tone signal and normal play is be added on loudspeaker 13 after corresponding end respectively through amplifying signal, loudspeaker 13 produces noise reducing tone signal and plays and normal music.Generate de-noising signal in this structure and be added to loudspeaker (earphone transducers) two ends through the first power amplifier amplifying signal and normal play music respectively through the second power amplifier amplifying signal, in order to produce noise reducing tone signal and to play music composition.Therefore the first power amplifier and the second power amplifier are connected loudspeaker two ends respectively and just form a complete noise reduction and play music circuit.
Be only several specific embodiment of the present utility model above, but the utility model is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection range of the present utility model.
Claims (4)
1. the active noise reduction circuit of an active noise reduction earphone, it is characterized in that, comprise the microphone for collecting noise, for noise is carried out filtering noise reduction filter, for noise reducing tone signal is amplified the first power amplifier, for the second power amplifier of amplifying the audio signal of normal play and the loudspeaker for playing signal; Described microphone is electrically connected by the input of filter with the first power amplifier, and the output of described first power amplifier is connected to one end of loudspeaker; The audio signal of normal play accesses the input of the second power amplifier, and the output of the second power amplifier is connected to the other end of loudspeaker.
2. the active noise reduction circuit of active noise reduction earphone according to claim 1, is characterized in that, described microphone is positioned at the outside of earphone.
3. the active noise reduction circuit of active noise reduction earphone according to claim 1, is characterized in that, described microphone is positioned at the inside of earphone.
4. the active noise reduction circuit of active noise reduction earphone according to claim 1, is characterized in that, described first power amplifier is by one end of data wire access loudspeaker; Described second power amplifier is by the other end of data wire access loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520782884.0U CN204993814U (en) | 2015-10-10 | 2015-10-10 | Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520782884.0U CN204993814U (en) | 2015-10-10 | 2015-10-10 | Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204993814U true CN204993814U (en) | 2016-01-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520782884.0U Expired - Fee Related CN204993814U (en) | 2015-10-10 | 2015-10-10 | Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204993814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535022A (en) * | 2016-12-07 | 2017-03-22 | 北京工业大学 | Earphone noise reduction circuit with balancer and power amplification function |
-
2015
- 2015-10-10 CN CN201520782884.0U patent/CN204993814U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535022A (en) * | 2016-12-07 | 2017-03-22 | 北京工业大学 | Earphone noise reduction circuit with balancer and power amplification function |
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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: 20160120 Termination date: 20161010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |