CN106162410A - A kind of noise cancelling headphone - Google Patents
A kind of noise cancelling headphone Download PDFInfo
- Publication number
- CN106162410A CN106162410A CN201610680632.6A CN201610680632A CN106162410A CN 106162410 A CN106162410 A CN 106162410A CN 201610680632 A CN201610680632 A CN 201610680632A CN 106162410 A CN106162410 A CN 106162410A
- Authority
- CN
- China
- Prior art keywords
- signal
- noise
- unit
- cancelling headphone
- noise cancelling
- 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.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/05—Noise reduction with a separate noise microphone
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Headphones And Earphones (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of noise cancelling headphone, including signal limiter unit (U1), amplifying unit (U2) and noise reduction microphone (MIC1), noise reduction microphone (MIC1) is arranged to acquisition noise signal, and by noise signal transmission to being used for providing the clamped end (P1) of input signal to amplifying unit (U2)；Amplifying unit (U2) is arranged to that the input signal received is amplified process and is amplified noise signal (signal)；Signal limiter unit (U1) is connected between clamped end (P1) and earth terminal (GND), and signal limiter unit (U1) is arranged to be fixed in set point the voltage of input signal.So so that the voltage of the input signal of amplifying unit is fixed in set point, and then output is limited in set point, the saturated uncomfortable sense of hearing causing power down to produce of rear class amplifier will not be made, promote Consumer's Experience.
Description
Technical field
The present invention relates to noise cancelling headphone field, more particularly it relates to an be provided with the fall of signal limiter unit
Make an uproar earphone.
Background technology
The normal noise cancelling headphone used under scene is to pass through the noise signal in a certain signal amplitude or frequency range
Anti-phase amplification, it is achieved noise suppressed, Fig. 1 is the existing anti-phase amplification method of conventional noise signal.In Fig. 1 the gain of Dolby circuit by
The ratio of R2 Yu R1 determines,In actually used scene, very big for noise sudden change, or confined air
The chien shih used time, noise can paranormal noise signal amplitude, can cause amplifier because input signal excessive, make amplifier saturated,
Cause amplifier overcurrent protection power-off, simultaneously as user is caused the most uncomfortable plosive in sense of hearing by the sudden change of this noise.
Summary of the invention
It is an object of the present invention to provide and a kind of avoid the new of the saturated uncomfortable sense of hearing causing power down to produce of rear class amplifier
Technical scheme.
According to the first aspect of the invention, it is provided that a kind of noise cancelling headphone, including signal limiter unit, amplifying unit and fall
Making an uproar mike, described noise reduction microphone is arranged to acquisition noise signal, and by described noise signal transmission to being used for described
Amplifying unit provides the clamped end of input signal；Described amplifying unit is arranged to the input signal received is amplified place
Reason is amplified noise signal；Described signal limiter unit is connected between described clamped end and earth terminal, described signal limiter
Unit is arranged to be fixed in set point the voltage of described input signal.
Optionally, described signal limiter unit is clamp circuit.
Optionally, described signal limiter unit is diode.
Optionally, described noise cancelling headphone also includes that rp unit, described rp unit are arranged to anti-phase described amplification
It is sent to described amplifying unit after being sent to the receiver of described noise cancelling headphone, or anti-phase described input signal after noise signal.
Optionally, described amplifying unit and described rp unit are provided by an inverting amplifier.
Optionally, described noise cancelling headphone also includes the call mike for gathering talker's acoustical signal.
Optionally, described noise cancelling headphone also includes that high pass filter unit, described high pass filter unit are arranged to filter
Described clamped end it is sent to after high-frequency signal in described noise signal.
It was found by the inventors of the present invention that in the prior art, there is noise sudden change and user is caused in sense of hearing the most not
Comfortable plosive problem.And in the present invention, by increasing letter between noise reduction microphone and the input of amplifying unit
Number clipping unit, makes the voltage of the input signal of amplifying unit be fixed in set point, and then makes output be limited to set
In the range of, the saturated uncomfortable sense of hearing causing power down to produce of rear class amplifier will not be made, promote Consumer's Experience.Therefore, the present invention is wanted
Realize technical assignment or the those skilled in the art of technical problem is that to be solved never expect or it is not expected that
, therefore the present invention is a kind of new technical scheme.
By detailed description to the exemplary embodiment of the present invention referring to the drawings, the further feature of the present invention and
Advantage will be made apparent from.
Accompanying drawing explanation
Combined in the description and the accompanying drawing of the part that constitutes description shows embodiments of the invention, and even
With its explanation together for explaining the principle of the present invention.
Fig. 1 is a kind of circuit theory diagrams implementing structure of existing noise cancelling headphone；
Fig. 2 is a kind of frame principle figure implementing structure according to noise cancelling headphone of the present invention；
Fig. 3 is a kind of circuit theory diagrams implementing structure according to noise cancelling headphone of the present invention.
Description of reference numerals:
U1-signal limiter unit；U2-amplifying unit；
MIC1, MIC2-mike；The clamped end of P1-；
Earth terminal-GND；Signal-amplifies noise signal；
U3-rp unit；R1, R2-resistance；
The input signal of Vin-inverting amplifier；The output signal of Vout-inverting amplifier.
Detailed description of the invention
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should also be noted that unless additionally have
Body illustrates, the parts illustrated the most in these embodiments and positioned opposite, the numerical expression of step and numerical value are not intended to this
The scope of invention.
Description only actually at least one exemplary embodiment is illustrative below, never as to the present invention
And any restriction applied or use.
May be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of when, described technology, method and apparatus should be considered a part for description.
It is shown here that any occurrence should be construed as merely exemplary with in all examples discussed, and not
It is as restriction.Therefore, other example of exemplary embodiment can have different values.
It should also be noted that similar label and letter represent similar terms, therefore, the most a certain Xiang Yi in following accompanying drawing
Individual accompanying drawing is defined, then need not it is further discussed in accompanying drawing subsequently.
In order to solve present in prior art noise sudden change, user is caused the most uncomfortable plosive in sense of hearing
Problem, it is provided that a kind of noise cancelling headphone, as in figure 2 it is shown, noise cancelling headphone of the present invention includes signal limiter unit U1, amplifying unit
U2 and noise reduction microphone MIC1, noise reduction microphone MIC1 are arranged to acquisition noise signal, and by this noise signal transmission to using
It is arranged to the input signal received is carried out in providing the clamped end P1, amplifying unit U2 of input signal to amplifying unit U2
Processing and amplifying is amplified noise signal signal；Signal limiter unit U1 is connected between clamped end P1 and earth terminal GND, letter
Number clipping unit U1 is arranged to be fixed in set point the voltage of input signal.
If noise sudden change is very big, or when confined space uses, noise can paranormal noise signal amplitude, can lead
The voltage causing noise signal is excessive, by connecting signal limiter unit U1 between clamped end P1 and earth terminal GND so that amplify
The voltage of the input signal of unit U2 is fixed in set point, is not result in the amplification noise signal that amplifying unit U2 exports
The voltage of signal is excessive, therefore, will not make rear class amplifier saturated generation plosive.
So, by increasing signal limiter unit U1 before the input of amplifying unit U2 so that amplifying unit U2's
The voltage of input signal is fixed in set point, and then makes the electricity of amplification noise signal signal that amplifying unit U2 exports
Pressure is also secured in another set point, efficiently solves noise cancelling headphone and uses hearing user under improper noisy environment
The damage caused and sense of hearing are uncomfortable, would not make the saturated plosive causing power down to produce of rear class amplifier, promote Consumer's Experience.
Wherein, clamped end P1 can be arranged on noise reduction microphone MIC1 transmission microphone signal to the path of amplifying unit U2
On optional position, i.e. it is any that signal limiter unit U1 can also be connected between noise reduction microphone MIC1 and amplifying unit U2
On position.
In one particular embodiment of the present invention, signal limiter unit U1 can be clamp circuit, wherein clamp circuit
It is that certain part of pulse signal is fixed in given voltage value, and keeps the circuit of original waveform shape invariance, clamp circuit
Effect be that top or the bottom of periodically variable waveform are maintained in a certain DC level determined.So, just realize
By the limiting voltage of the input signal of amplifying unit U2 in fixed value, it is achieved the clamped effect to applied signal voltage.
In another specific embodiment of the present invention, signal limiter unit U1 can be diode, wherein, diode
Clamping action refers to utilize diode forward conduction voltage drop the most stable, and the feature of numerical value less (sometimes can be approximately zero),
Carry out the current potential of certain point in limiting circuit.Signal limiter unit U1 can also use other voltage limiting electronic elements such as TVS.
Further, it is Mike's wind that noise reduction microphone is collected due to the active noise reduction cardinal principle of noise cancelling headphone
Number carry out reversely, after amplification etc. processes, launch sound wave contrary with noise phase, that amplitude is identical by headset earpiece and keep out and make an uproar
Sound so that noise disappears, and therefore, noise cancelling headphone of the present invention also includes rp unit U3, and this rp unit U3 is arranged to anti-phase
It is sent to the receiver of noise cancelling headphone after amplifying noise signal signal, or after rp input signal, is sent to amplifying unit, tool
Body, anti-phase can be before processing and amplifying, it is also possible to be after processing and amplifying.
On this basis, amplifying unit U2 and rp unit U3 can be provided by an inverting amplifier, this anti-phase amplification
The circuit structure of device such as can as it is shown on figure 3, Dolby circuit gain by R2 Yu R1 ratio determine,
Wherein, Vout is the output signal of inverting amplifier, and Vin is inverting amplifier input signal, and R2 is resistance R2
Resistance, R1 is the resistance of resistance R1.
So, just realize anti-phase and amplify on the basis of, save noise cancelling headphone circuit space of the present invention so that this
Bright noise cancelling headphone is more prone to realize.
Concrete, noise cancelling headphone of the present invention also includes the call mike for gathering talker's acoustical signal, so, originally
The noise cancelling headphone of invention just can also realize noise reduction of conversing, concrete, and the cardinal principle of call noise reduction is to be adopted by noise reduction microphone
Collect to microphone signal carry out reversely, after amplification etc. processes, sound wave contrary with noise phase, that amplitude is identical sent to leading to
The other end of words so that the noise in communication process disappears.
If the mike that noise cancelling headphone of the present invention uses is that (the art is commonly referred to for electret condenser microphone
ECM mike), when noise cancelling headphone of the present invention uses this mike in the presence of wind or air blast, or when talker's
During expiration directly impact ECM mike, ECM mike produces due to the fluctuation of blast a kind of obvious low frequency impact
Puff puff whiff.This whiff can seriously reduce the quality of acoustical signal, here it is wind is made an uproar.The generation that wind is made an uproar is due to wind
Blow to Headphone structure, with Headphone structure, fricative turbulent flow sound occurs, especially blow to the wind of the sound hole of earphone outer covering
Making an uproar, such wind is made an uproar and is not only difficult to eliminate by above-mentioned active noise reduction function, may be lifted on the contrary, affect noise reduction.
Therefore, in one particular embodiment of the present invention, the noise cancelling headphone of the present invention can also include high-pass filtering list
Unit, high pass filter unit is sent to clamped end, so can filter and make an uproar after being arranged to the high-frequency signal filtering in noise signal
In acoustical signal, most low frequency wind is made an uproar, and effectively promotes the effect that the mike Radix Saposhnikoviae of noise cancelling headphone of the present invention is made an uproar.
The various embodiments described above primary focus describes the difference with other embodiments, but those skilled in the art should be clear
Chu, the various embodiments described above can be used alone as required or be combined with each other.Embodiments described above is only
Being only illustrative, wherein, any unit described in the various embodiments described above or circuit can be by one or more physics
Parts realize, it is also possible to be that a physical unit realizes multiple unit or circuit.Those of ordinary skill in the art are not paying
In the case of creative work, i.e. it is appreciated that and implements.
Although by example, some specific embodiments of the present invention have been described in detail, but the skill of this area
Art personnel are it should be understood that example above is merely to illustrate rather than in order to limit the scope of the present invention.The skill of this area
Art personnel are it should be understood that can modify to above example without departing from the scope and spirit of the present invention.This
Bright scope is defined by the following claims.
Claims (7)
1. a noise cancelling headphone, it is characterised in that include signal limiter unit (U1), amplifying unit (U2) and noise reduction microphone
(MIC1), described noise reduction microphone (MIC1) is arranged to acquisition noise signal, and by described noise signal transmission to be used for
Described amplifying unit (U2) provides the clamped end (P1) of input signal；Described amplifying unit (U2) is arranged to defeated to receive
Enter signal to be amplified process and be amplified noise signal (signal)；Described signal limiter unit (U1) is connected to described clamped
Between end (P1) and earth terminal (GND), described signal limiter unit (U1) is arranged to fix the voltage of described input signal
In set point.
Noise cancelling headphone the most according to claim 1, it is characterised in that described signal limiter unit (U1) is clamp circuit.
Noise cancelling headphone the most according to claim 1, it is characterised in that described signal limiter unit (U1) is diode.
Noise cancelling headphone the most according to claim 1, it is characterised in that described noise cancelling headphone also includes rp unit (U3),
Described rp unit (U3) is sent to listening of described noise cancelling headphone after being arranged to anti-phase described amplification noise signal (signal)
Cylinder, or after anti-phase described input signal, it is sent to described amplifying unit (U2).
Noise cancelling headphone the most according to claim 4, it is characterised in that described amplifying unit (U2) and described rp unit
(U3) provided by an inverting amplifier.
Noise cancelling headphone the most according to claim 1, it is characterised in that described noise cancelling headphone also includes for gathering talker
The call mike (MIC2) of acoustical signal.
Noise cancelling headphone the most according to claim 1, it is characterised in that described noise cancelling headphone also includes high pass filter unit,
Described high pass filter unit is sent to described clamped end (P1) after being arranged to filter the high-frequency signal in described noise signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610680632.6A CN106162410A (en) | 2016-08-16 | 2016-08-16 | A kind of noise cancelling headphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610680632.6A CN106162410A (en) | 2016-08-16 | 2016-08-16 | A kind of noise cancelling headphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106162410A true CN106162410A (en) | 2016-11-23 |
Family
ID=57331392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610680632.6A Pending CN106162410A (en) | 2016-08-16 | 2016-08-16 | A kind of noise cancelling headphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106162410A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393551A (en) * | 2017-08-04 | 2017-11-24 | 歌尔科技有限公司 | Audio defeat method and device |
| CN113242490A (en) * | 2021-06-22 | 2021-08-10 | 安克创新科技股份有限公司 | Signal processing method and device, headset and storage medium |
| WO2024119396A1 (en) * | 2022-12-07 | 2024-06-13 | 深圳市韶音科技有限公司 | Open-ear wearable acoustic device and active noise cancellation method thereof |
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| CN202422725U (en) * | 2012-01-06 | 2012-09-05 | 重庆三弓科技发展有限公司 | Audio signal processing circuit |
| US20140056422A1 (en) * | 2012-08-21 | 2014-02-27 | Hon Hai Precision Industry Co., Ltd. | Noise suppression system |
| CN203872324U (en) * | 2014-03-31 | 2014-10-08 | 深圳市冠旭电子有限公司 | Active noise reduction earphone and noise reduction microphone signal passive amplitude limiting circuit thereof |
| CN205123979U (en) * | 2015-10-23 | 2016-03-30 | 钰太芯微电子科技（上海）有限公司 | Protection circuit based on speaker |
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2016
- 2016-08-16 CN CN201610680632.6A patent/CN106162410A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202422725U (en) * | 2012-01-06 | 2012-09-05 | 重庆三弓科技发展有限公司 | Audio signal processing circuit |
| US20140056422A1 (en) * | 2012-08-21 | 2014-02-27 | Hon Hai Precision Industry Co., Ltd. | Noise suppression system |
| CN203872324U (en) * | 2014-03-31 | 2014-10-08 | 深圳市冠旭电子有限公司 | Active noise reduction earphone and noise reduction microphone signal passive amplitude limiting circuit thereof |
| CN205123979U (en) * | 2015-10-23 | 2016-03-30 | 钰太芯微电子科技（上海）有限公司 | Protection circuit based on speaker |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393551A (en) * | 2017-08-04 | 2017-11-24 | 歌尔科技有限公司 | Audio defeat method and device |
| CN107393551B (en) * | 2017-08-04 | 2021-07-30 | 歌尔科技有限公司 | Audio noise reduction method and device |
| CN113242490A (en) * | 2021-06-22 | 2021-08-10 | 安克创新科技股份有限公司 | Signal processing method and device, headset and storage medium |
| CN113242490B (en) * | 2021-06-22 | 2023-02-28 | 安克创新科技股份有限公司 | Signal processing method and device, headset and storage medium |
| WO2024119396A1 (en) * | 2022-12-07 | 2024-06-13 | 深圳市韶音科技有限公司 | Open-ear wearable acoustic device and active noise cancellation method thereof |
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Application publication date: 20161123 |
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