CN206533513U - Head circuit with adjustable feedback formula active noise reduction level - Google Patents
Head circuit with adjustable feedback formula active noise reduction level Download PDFInfo
- Publication number
- CN206533513U CN206533513U CN201720202820.8U CN201720202820U CN206533513U CN 206533513 U CN206533513 U CN 206533513U CN 201720202820 U CN201720202820 U CN 201720202820U CN 206533513 U CN206533513 U CN 206533513U
- Authority
- CN
- China
- Prior art keywords
- adjustable
- signal
- noise reduction
- active noise
- noise
- 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 - Fee Related
Links
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model is related to a kind of head circuit with adjustable feedback formula active noise reduction level, including：Noise inputs part, voice input portion, amplification output par, c；After the noise inputs part is mixed with the voice input portion by adder, signal is amplified by amplifying output par, c, then by signal output；The audio signal of output is back to noise output par, c by amplification output par, c, forms adjustable feedback formula active noise reduction.The utility model is by setting an adjustable amplifier, the problem of making adjustable feedback formula active noise reduction level present in prior art, active noise reduction level and the regulation of music balanced device all be controlled using a gain is resolved, and audio signal gain is not influenceed by reaction type active noise reduction level, the utility model is simple in construction, easy to use, lifting earphone acoustical quality is obvious.
Description
Technical field
The utility model is related to head circuit technical field, more particularly to a kind of with adjustable feedback formula active noise reduction level
Head circuit.
Background technology
In the prior art, the reaction type active noise reduction level of earphone, active noise reduction level and music balanced device are adjusted all
Using same earphone gain, prior art has the drawback that shadow of the music frequency gain by reaction type active noise reduction level
Ring, the tonequality influence on earphone is very big.
Therefore, prior art needs to improve.
Utility model content
The utility model discloses a kind of head circuit with adjustable feedback formula active noise reduction level, to make earphone real
Existing adjustable feedback formula active noise reduction level, active noise reduction level and the regulation of music balanced device are all controlled using a gain, and sound
Frequency signal gain is not influenceed by reaction type active noise reduction level.
A kind of head circuit with adjustable feedback formula active noise reduction level that the utility model embodiment is provided, including：
Noise inputs part, voice input portion, amplification output par, c；
After the noise inputs part is mixed with the voice input portion by adder, by amplifying output par, c pair
Signal amplifies, then by signal output；
The noise inputs part includes microphone, the first filter, and the microphone receives the noise of nature with raising
Sound device returns the mixed signal of sound, and mixed signal is amplified, and forms the noise signal of reaction type active noise reduction, noise signal warp
First filter carries out noise filtering；
The voice input portion includes audio-source, the second filter, after the audio signal of the audio-source is amplified,
Output is to the second filter, and the second filter is filtered to audio signal, the audio signal after output filtering；
The amplification output par, c includes：Adjustable amplifier, second adder, amplifier, loudspeaker, it is described that noise is defeated
Enter the noise signal of part and the audio signal mixing of voice input portion, export to adjustable amplifier, adjustable amplifier is to mixed
Close signal and carry out adjustable amplification, then mixed with the audio signal of audio-source by second adder, output to amplifier is carried out
Amplification, is then exported to loudspeaker.
In another implementation based on the above-mentioned head circuit with adjustable feedback formula active noise reduction level of the utility model
In example, the voice input portion also includes the second adjustable amplifier；
The audio signal of the audio-source is exported to the second adjustable amplifier and carried out after adjustable amplification, by the audio after amplification
Signal is inputted to the second filter.
Compared with prior art, the utility model includes advantages below：
Head circuit of the present utility model with adjustable feedback formula active noise reduction level, by setting an adjustable amplification
Device, makes adjustable feedback formula active noise reduction level present in prior art, active noise reduction level and the regulation of music balanced device all make
The problem of being controlled with a gain is resolved, and audio signal gain is not influenceed by reaction type active noise reduction level, this practicality
New structure is simple, easy to use, and lifting earphone acoustical quality is obvious.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used in description of the prior art does one and simply introduced.
Fig. 1 is the electricity of one embodiment of the head circuit of the present utility model with adjustable feedback formula active noise reduction level
Lu Tu.
Fig. 2 is that the head circuit of the present utility model with adjustable feedback formula active noise reduction level becomes with adjustable amplifier
Noise reduction gain oscillogram during change.
Fig. 3 is that the head circuit of the present utility model with adjustable feedback formula active noise reduction level becomes with adjustable amplifier
Audio gain oscillogram during change.
Fig. 4 is that the head circuit of the present utility model with adjustable feedback formula active noise reduction level becomes with adjustable amplifier
Circuit overall gain oscillogram during change.
Fig. 5 is another embodiment of the head circuit of the present utility model with adjustable feedback formula active noise reduction level
Circuit diagram.
In figure：1 noise inputs part, 2 voice input portions, 3 amplification output par, cs
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is only a part of embodiment of the utility model, rather than whole embodiments.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
Fig. 1 is the circuit of one embodiment of the head circuit with adjustable feedback formula active noise reduction level of the present invention
Figure, as shown in figure 1, the head circuit with adjustable feedback formula active noise reduction level includes：
Noise inputs part 1, voice input portion 2, amplification output par, c 3；
After the noise inputs part 1 is mixed with the voice input portion 2 by adder, by amplifying output par, c
3 pairs of signal amplifications, then by signal output；
The noise inputs part 1 includes microphone, the first filter, and the microphone receives the noise of nature with raising
Sound device returns the mixed signal of sound, and mixed signal is amplified, and forms the noise signal of reaction type active noise reduction, noise signal warp
First filter carries out noise filtering；
The voice input portion 2 includes audio-source, the second filter, and the audio signal of the audio-source is amplified
Afterwards, output is to the second filter, and the second filter is filtered to audio signal, the audio signal after output filtering；
The amplification output par, c 3 includes：Adjustable amplifier, second adder, amplifier, loudspeaker, it is described by noise
The noise signal of importation 1 and the audio signal mixing of voice input portion 2, output to adjustable amplifier, adjustable amplifier
Adjustable amplification is carried out to mixed signal, then mixed with the audio signal of audio-source by second adder, output to amplifier
It is amplified, then exports to loudspeaker.
In the particular embodiment, the microphone of earphone is placed in before loudspeaker, and microphone receives the noise of nature and raised
The sound of sound device feedback, the amplifier carried by microphone amplifies the sound of mixing, because microphone have received loudspeaker
Feedback sound, therefore, the noise section in mixed noise is suppressed, and forms reaction type active noise reduction, due to amplification
Output par, c sets adjustable amplifier, therefore, and what is formed in noise inputs part is adjustable feedback formula active noise reduction.
Loudspeaker, the first filter, amplifier, the open-loop gain A that the product of the gain of microphone is reponse system are set, the
The gain of tow filtrator is B, and the gain of adjustable amplifier is g, has adjustable feedback formula active noise reduction electricity due to prior art
Flat head circuit is not provided with adjustable amplifier, and it is formed by placing the microphone in earphone cup beside loudspeaker
Reponse system, while reaction type active noise reduction system gain, changes the noise and audio in earphone cup, therefore, existing
The noise gain of the head circuit with adjustable feedback formula active noise reduction level of technology is：
A value is bigger, and the decay of head circuit is bigger, in order that the original head circuit overall gain of loudspeaker holding, sound
Frequency equalization device gain, input offset EQ is designed as：
EQ≈1+A (2)
Therefore, head circuit overall gain is：
But, because the open-loop gain A for changing reponse system needs to redesign input offset gain EQ, and show
The open-loop gain A and input offset gain EQ for having the reponse system of technology are fixed, in an embodiment of the present invention, due to setting
Adjustable amplifier has been put, therefore,
The noise gain of system is：
The audio gain of system is：1+B×g (5)
The overall gain of head circuit is：
Set loudspeaker, the first filter, amplifier, the gain of microphone product as reponse system open-loop gain A,
The gain of tow filtrator is that B meets A ≈ B, then：
Thus, only it is applicable loudspeaker available close to former audio gain and less by adjustable amplifier gain g or active
The influence of noise reduction level change.
Fig. 2 is the head circuit with adjustable feedback formula active noise reduction level of the present invention when changing with adjustable amplifier
Noise reduction gain oscillogram, as shown in Fig. 2 the variable resistor by adjusting adjustable amplifier, when variable resistor is respectively set to
When high, medium and low three class, with the change of noise signal frequencies, active noise reduction gain changes therewith, noise gain with
The increase of the adjustable resistance of adjustable amplifier and reduce.
Fig. 3 is the head circuit with adjustable feedback formula active noise reduction level of the present invention when changing with adjustable amplifier
Audio gain oscillogram, as shown in figure 3, the variable resistor by adjusting adjustable amplifier, when variable resistor is respectively set to
When high, medium and low three class, with the change of audio signal frequency, audio signal gain changes therewith.Can with reference to Fig. 2
Know, when audio signal gain change is big, the gain of noise signal then reduces, in 0-1KHz, and the amplitude of variation of gain is larger, sound
The gain of frequency signal reduces with the reduction of the adjustable resistance of adjustable amplifier, and the gain of noise signal is with adjustable amplifier
Adjustable resistance reduction and increase.
Fig. 4 is the head circuit with adjustable feedback formula active noise reduction level of the present invention when changing with adjustable amplifier
Circuit overall gain oscillogram, as shown in figure 4, the variable resistor by adjusting adjustable amplifier, when variable resistor is set respectively
When for high, medium and low three class, with the change of mixing frequency signal, system overall gain changes therewith, still, same
Under the mixing frequency signal of sample, the different changes to gain of resistance are not obvious, and yield value is than more consistent.
Fig. 5 is the circuit of another embodiment of the head circuit with adjustable feedback formula active noise reduction level of the present invention
Figure, as shown in figure 5, the voice input portion 2 also includes the second adjustable amplifier；
The audio signal of the audio-source is exported to the second adjustable amplifier and carried out after adjustable amplification, by the audio after amplification
Signal is inputted to the second filter；
The gain for setting the first adjustable amplifier is g1, and the gain of the second adjustable amplifier is g2, loudspeaker, the first filtering
Device, amplifier, the product of the gain of microphone are A, and the gain of the second filter is B, then：
The noise gain of system is：
The audio gain of system is：1+B×g2×g1 (9)
The overall gain of head circuit is：
B × g2 × g1 ≈ A × g1 is made, then：
A kind of head circuit with adjustable feedback formula active noise reduction level provided by the utility model is carried out above
It is discussed in detail, specific case used herein is set forth to principle of the present utility model and embodiment, and the above is real
The explanation for applying example is only intended to help and understands method of the present utility model and its core concept；Simultaneously for the general of this area
Technical staff, according to thought of the present utility model, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as to limitation of the present utility model.
Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, this is not limited to
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic
Equivalent substitution is carried out, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvements made etc.,
It should be included within protection domain of the present utility model.
Claims (2)
1. a kind of head circuit with adjustable feedback formula active noise reduction level, it is characterised in that including：
Noise inputs part, voice input portion, amplification output par, c；
After the noise inputs part is mixed with the voice input portion by adder, by amplifying output par, c to signal
Amplification, then by signal output；
The noise inputs part includes microphone, the first filter, and the microphone receives the noise and loudspeaker of nature
The mixed signal of sound is returned, mixed signal is amplified, the noise signal of reaction type active noise reduction is formed, noise signal is through first
Filter carries out noise filtering；
The voice input portion includes audio-source, the second filter, after the audio signal of the audio-source is amplified, output
To the second filter, the second filter is filtered to audio signal, the audio signal after output filtering；
The amplification output par, c includes：Adjustable amplifier, second adder, amplifier, loudspeaker, it is described by noise inputs portion
The noise signal divided and the audio signal mixing of voice input portion, output to adjustable amplifier, adjustable amplifier are believed mixing
Number adjustable amplification is carried out, is then mixed with the audio signal of audio-source by second adder, export to amplifier and be amplified,
Then export to loudspeaker.
2. head circuit according to claim 1, it is characterised in that the voice input portion also includes second and adjustable put
Big device；
The audio signal of the audio-source is exported to the second adjustable amplifier and carried out after adjustable amplification, by the audio signal after amplification
Input to the second filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720202820.8U CN206533513U (en) | 2017-03-03 | 2017-03-03 | Head circuit with adjustable feedback formula active noise reduction level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720202820.8U CN206533513U (en) | 2017-03-03 | 2017-03-03 | Head circuit with adjustable feedback formula active noise reduction level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206533513U true CN206533513U (en) | 2017-09-29 |
Family
ID=59915683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720202820.8U Expired - Fee Related CN206533513U (en) | 2017-03-03 | 2017-03-03 | Head circuit with adjustable feedback formula active noise reduction level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206533513U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911980A (en) * | 2017-03-03 | 2017-06-30 | 富士高实业有限公司 | Head circuit with adjustable feedback formula active noise reduction level |
-
2017
- 2017-03-03 CN CN201720202820.8U patent/CN206533513U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911980A (en) * | 2017-03-03 | 2017-06-30 | 富士高实业有限公司 | Head circuit with adjustable feedback formula active noise reduction level |
| WO2018157266A1 (en) * | 2017-03-03 | 2018-09-07 | 富士高实业有限公司 | Headphone circuit with adjustable feedback-type active noise-reduction level |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106911980A (en) | Head circuit with adjustable feedback formula active noise reduction level | |
| WO2020134466A1 (en) | Sound quality adjustment method and device | |
| CN107071654A (en) | A kind of digital noise reduction method, device and a kind of audio-frequence player device | |
| CN105978498B (en) | A kind of low-noise amplifier of the adjustable gain of single ended input both-end output | |
| JP6785907B2 (en) | How to arrange wireless speakers, wireless speakers and terminal devices | |
| CN103297894A (en) | Earphone power amplifier, working method and mobile terminal equipment | |
| JP2013187861A (en) | Audio output circuit, electronic device using the same, and integrated circuit for audio | |
| US20200343871A1 (en) | Tracking and correcting gain of open-loop driver in a multi-path processing system | |
| US10181845B1 (en) | Calibration of a dual-path pulse width modulation system | |
| CN103516314B (en) | Low-noise amplifier and not there is the receptor of SAW (Surface Acoustic Wave) filter | |
| CN206533513U (en) | Head circuit with adjustable feedback formula active noise reduction level | |
| US10701486B1 (en) | Low-latency audio output with variable group delay | |
| US2740850A (en) | Audio frequency output amplifier | |
| CN205051656U (en) | Microphone amplification circuit | |
| CN204425620U (en) | A kind of audio signal processing circuit | |
| CN202310065U (en) | Audio output device | |
| US20200058326A1 (en) | Polymorphic playback system with signal detection filters of different latencies | |
| CN114928335A (en) | Low-noise audio amplifier and equipment | |
| CN101764579A (en) | Gain-adjustable audio power amplifier circuit | |
| CN106792359B (en) | Electronic equipment and audio power amplifier system thereof | |
| US10594310B2 (en) | Full-scale range enhancement in a dual-path pulse width modulation playback system | |
| US10263584B1 (en) | Calibration of a dual-path pulse width modulation system | |
| CN210403192U (en) | Four-channel audio small signal conditioner | |
| CN205566629U (en) | Rectify interconnected circuit of audio amplifier tweeter unit and bass unit phase difference | |
| CN204993809U (en) | Dual track audio power amplifier circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 |