CN202310065U - Audio output device - Google Patents
Audio output device Download PDFInfo
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- CN202310065U CN202310065U CN2011204104139U CN201120410413U CN202310065U CN 202310065 U CN202310065 U CN 202310065U CN 2011204104139 U CN2011204104139 U CN 2011204104139U CN 201120410413 U CN201120410413 U CN 201120410413U CN 202310065 U CN202310065 U CN 202310065U
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Abstract
The utility model discloses an audio output device, which belongs to the field of an electronic circuit. The audio output device comprises a standard audio output module, a negative pressure simulation module, a noise simulation module and a phase-inverter circuit module, wherein the negative pressure simulation module, the noise simulation module and the phase-inverter circuit module are connected in series, a series circuit of the negative pressure simulation module, the noise simulation module and the phase-inverter circuit module is connected with the standard audio output module in parallel, and the standard audio output module and the phase-inverter circuit module are connected with the same ground wire. According to the audio output device disclosed by the utility model, by simulating the noise generated by a junction field effect transistor in a standard MIC (Microphone) circuit, carrying out a phase-inverter operation for the noise and overlaying audio signals generated by the standard MIC circuit, the noise in the standard MIC circuit can be removed; and according to the technical scheme, a dynamic power supply noise can be removed, the removing of the noise can be realized by adopting a hardware, the increasing of power consumption due to a complex software operation is avoided, the real-time performance is good, and normal audio signals cannot be influenced while the noise is removed.
Description
Technical field
The utility model relates to electronic circuit field, particularly a kind of audio output device.
Background technology
TDD (Time Division Duplexing, time division duplex) is a kind of of mechanics of communication.Because on voice-frequency channel, be easy to generate noise under this standard, this noise is called as the TDD noise.The TDD noise produces reason and mainly contains two: the interference of radiofrequency signal, the interference of power supply signal.Interference on the radio frequency often can solve through filter circuit.Power supply signal, can't solve through filter circuit in the frequency range of audio frequency owing to be low frequency signal.
Wireless telecommunications system, especially mobile phone products often produce up TDD noise, the noise of promptly introducing on MIC (Microphone, the microphone) circuit under GSM (Global System of Mobile communication, global system for mobile communications) pattern.This situation is placed at MIC and is easy under the situation of antenna area take place; Especially on mobile phone products; The layout that radio circuit and antenna are placed on the mobile phone Lower Half has become main flow gradually, and MIC must be placed on the below of mobile phone, is very easy to introduce TDD noise in this case.
In the inner typical structure of MIC; Core component is electret and a technotron (JFET; Junction Field Effect Transistor), the G utmost point of electret control technotron is when the voltage constant of the D utmost point that is added in technotron and the S utmost point; Electret the changing of Hair Fixer that power on causes the impedance of technotron to change output audio signal.
The output characteristic curve of technotron is as shown in Figure 1, and theoretical curve is as the D utmost point of technotron and the voltage u between the S utmost point
DSWhen constant, the current i of the D utmost point in the saturation region
DBe to keep constant, but in actual curve, work as u
DSDuring variation, i
DMinor variations is arranged, when visible power supply V+ and the voltage between the earth connection GND as MIC changes, can cause being added in the u on the technotron
DSChange; Therefore can on the output signal, change; That is to say that the noise on V+ and the GND can be transmitted on the output signal of MIC, because the multiplication factor of the amplifying circuit of MIC circuit rear end is all than higher, generally more than 20dB; Even, cause bad subjective feeling so very little noise also can be heard.
In the prior art, generally on software, eliminate noise through algorithm.
In the process that realizes the utility model, invent everybody and find that there is following problem at least in prior art:
On software, through the mode of algorithm elimination noise, can't eliminate dynamic noise, real-time is poor, can exert an influence to normal voice, and it is poor to eliminate anti noise.
The utility model content
For the noise problem of the output signal that solves existing MIC circuit, the utility model embodiment provides a kind of audio output device.Said technical scheme is following:
A kind of audio output device; Said device comprises: standard audio output module, negative pressure analog module, noise simulation module and negative circuit module; Said negative pressure analog module, noise simulation module and the series connection of negative circuit module; The series circuit of said negative pressure analog module, noise simulation module and negative circuit module is parallelly connected with said standard audio output module, and said standard audio output module is connected same ground wire with said noise simulation module;
Wherein, said standard audio output module is used for output audio signal;
Said negative pressure analog module is used for to said noise simulation module negative voltage being provided, and the negative voltage that the electret in said negative voltage and the said standard audio output module produces is identical;
Said noise simulation module is used for generating the noise identical with the technotron of said standard audio output module;
Said negative circuit module; Be used for the noise that said noise simulation module produces is carried out the magnitude of voltage of anti-phase scale operation with the noise that changes said noise simulation module and produce so that with the audio signal of said standard audio output module output the audio signal behind the noise of being eliminated that superposes.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: through the noise of the generation of the technotron among the noise simulation module simulation standard MIC; And this noise carried out the audio signal stack that produces with standard MIC circuit after the anti-phase computing; To eliminate the noise in the standard MIC circuit in the standard audio output module; This scheme can be eliminated the dynamic power supplies noise, uses hardware to realize, the increase of avoiding complicated software algorithm to bring power consumption; And real-time is good, in de-noising, does not influence normal voice signal.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the output characteristic curve sketch map of the technotron that provides in the utility model background technology;
Fig. 2 is the structural representation of a kind of audio output device of providing among the utility model embodiment 1;
Fig. 3 is that the circuit of a kind of audio output device of providing among the utility model embodiment 2 is formed structural representation.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model execution mode is done to describe in detail further below.
Embodiment 1
As shown in Figure 2, present embodiment provides a kind of structural representation of audio output device;
This device comprises: standard audio output module 1, negative pressure analog module 2, noise simulation module 3 and negative circuit module 4; Negative pressure analog module 2, noise simulation module and the series connection of negative circuit module; Negative pressure analog module 2, noise simulation module and negative circuit module tandem compound are parallelly connected with standard audio output module 1, and standard audio output module 1 is connected same ground wire with noise simulation module 3;
Wherein, standard audio output module 1 is used for according to the existing standard output audio signal;
Negative pressure analog module 2 is used for to noise simulation module 3 negative voltage being provided, and the negative voltage that the electret in said negative voltage and the standard audio output module 1 produces is identical;
Negative circuit module 4; Be used for the noise that noise simulation module 3 produces is carried out the magnitude of voltage of anti-phase scale operation with the noise that changes noise simulation module 3 and produce so that with the audio signal of standard audio output module 1 output superpose be eliminated behind the noise audio signal and through signal output part output.
Wherein, as shown in Figure 3, standard audio output module 1 comprises second resistance R 2, MIC, the 3rd power supply V3 and second capacitor C 2;
In the present embodiment, for the ease of explanation, second resistance R 2 is specially 2K Ω, and MIC is prior standard MIC, and second capacitor C 2 is specially capacitance, and the 3rd power supply V3 is 1.8V, can be MIC operating voltage is provided.
Wherein, an end of second resistance R 2 links to each other with the positive pole of the 3rd power supply V3, and the other end of second resistance R 2 links to each other with MIC;
The end of MIC links to each other with second resistance R 2, second capacitor C 2, and the other end of MIC is connected with ground wire;
The positive pole of the 3rd power supply V3 links to each other with second resistance R 2, and the negative pole of the 3rd power supply V3 is connected with ground wire;
One end of second capacitor C 2 is connected with second resistance R 2, MIC, and the other end of second capacitor C 2 is connected with signal output part.
Further, negative pressure analog module 2 comprises second source V2, the 3rd resistance R 3 and the 4th resistance R 4;
In the present embodiment; Second source V2 is specially-1.8V; Be used for being used for a negative voltage to the G utmost point of second technotron being provided through negative voltage of output after the 3rd resistance R 3 and the 4th resistance R 4 dividing potential drops, this negative voltage is identical with the negative pressure that the inner electret of MIC produces; And can adjust the partial pressure value of output through the resistance value of regulating the 3rd resistance R 3 and the 4th resistance R 4, current resistance value with the 3rd resistance R 3 and the 4th resistance R 4 is set at 10K Ω and 1K Ω respectively.
Wherein, the positive pole of second source V2 is connected with the 3rd resistance R 3, and the negative pole of second source V2 is connected with ground wire;
One end of the 3rd resistance R 3 is connected with the positive pole of second source V2, and the other end of the 3rd resistance R 3 is connected with the 4th resistance R 4, first capacitor C 1;
One end of the 4th resistance R 4 is connected with the 3rd resistance R 3, first capacitor C 1, and the other end of the 4th resistance R 4 is connected with ground wire.
Further, noise simulation module 3 comprises first capacitor C 1, first resistance R 1 and the second technotron Q2;
In the present embodiment, the second technotron Q2 is identical with the technotron performance of MIC inside, and first resistance R 1 is identical with the resistance need of second resistance, and is pull-up resistor.
Wherein, first capacitor C 1 is parallelly connected with the 4th resistance, and the non-earth terminal of first electric capacity is connected with the D utmost point of the second technotron Q2;
One end of first resistance R 1 is connected with the positive pole of the 3rd power supply, and the other end of first resistance R 1 is connected with the S utmost point of the second technotron Q2;
The D utmost point of the second technotron Q2 is connected with the non-earth terminal of first capacitor C 1, and the S utmost point of the second technotron Q2 is connected with first resistance R 1, the 7th resistance R 7, and the G utmost point of the second technotron Q2 is connected with ground wire.
Further, negative circuit module 4 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the first power supply V1, the first amplifier U1 and the 4th capacitor C 4;
In the present embodiment, the first power supply V1 is that the first amplifier U1 provides power supply, and the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the first amplifier U1 form anti-phase scale operation circuit; And Uout=(R6/R7) * Uin, wherein, Uin is the voltage of the noise signal of noise simulation module 3 generations; Uout is the voltage through the noise signal behind the above-mentioned anti-phase scale operation circuit computing, and generally, the resistance of setting the 6th resistance R 6 and the 7th resistance R 7 is same; Be that multiplication factor is 1 times and gets final product, when noise can not be eliminated fully, can be through adjusting the magnitude of voltage that the 6th resistance R 6 and the 7th resistance R 7 values change de-noising circuit output; Reach the purpose of eliminating noise fully, preferably, the voltage of the first power supply V1 is 3.6V; The resistance of the 6th resistance and the 7th resistance is initially 2K Ω, and the resistance of the 8th resistance is 2K Ω.
Wherein, an end of the 6th resistance R 6 is connected with the inverting input of the 7th resistance R 7, the first amplifier U1, and the other end of the 6th resistance R 6 is connected with the output of the first amplifier U1;
One end of the 7th resistance R 7 is connected with the S utmost point of first resistance R 1, the second technotron Q2, and the other end of the 7th resistance R 7 is connected with the inverting input of the 6th resistance R 6, the first amplifier U1;
One end of the 8th resistance R 8 is connected with the in-phase input end of the first amplifier U1, and the other end of the 8th resistance R 8 is connected with ground wire;
The end of the first power supply V1 is connected with the positive power source terminal of the first amplifier U1, and the other end of the first power supply V1 is connected with ground wire;
The inverting input of the first amplifier U1 is connected with the 6th resistance R 6, the 7th resistance R 7; The in-phase input end of the first amplifier U1 is connected with the 8th resistance R 8; The positive power source terminal of the first amplifier U1 is connected with the positive pole of the first power supply V1; The negative power end of the first amplifier U1 is connected with ground wire, and the output of the first amplifier U1 is connected with the 4th capacitor C 4;
One end of the 4th capacitor C 4 is connected with the output of the first amplifier U1, and the other end of the 4th capacitor C 4 links to each other with second capacitor C 2, signal output part.
Wherein, Through the output of second capacitor C 2 be the audio signal of standard audio output module 1 output, through the noise for exporting of the 4th capacitor C 4 outputs, after above-mentioned two kinds of signals superpose through the noise simulation module after the anti-phase computing 3; Eliminate noise, and through signal output part output.
A kind of audio output device that present embodiment provides, the noise that produces through the technotron among the noise simulation module simulation standard MIC, and this noise carried out the audio signal stack that produces with standard MIC circuit after the anti-phase computing; To eliminate the noise in the standard MIC circuit; This scheme can be eliminated the dynamic power supplies noise, uses hardware to realize, the increase of avoiding complicated software algorithm to bring power consumption; And real-time is good, in de-noising, does not influence normal voice signal.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. audio output device; It is characterized in that; Said device comprises: standard audio output module, negative pressure analog module, noise simulation module and negative circuit module; Said negative pressure analog module, noise simulation module and the series connection of negative circuit module, the series circuit of said negative pressure analog module, noise simulation module and negative circuit module is parallelly connected with said standard audio output module, and said standard audio output module is connected same ground wire with said noise simulation module;
Wherein, said standard audio output module is used for output audio signal;
Said negative pressure analog module is used for to said noise simulation module negative voltage being provided, and the negative voltage that the electret in said negative voltage and the said standard audio output module produces is identical;
Said noise simulation module is used for generating the noise identical with the technotron of said standard audio output module;
Said negative circuit module; Be used for the noise that said noise simulation module produces is carried out the magnitude of voltage of anti-phase scale operation with the noise that changes said noise simulation module and produce so that with the audio signal of said standard audio output module output the audio signal behind the noise of being eliminated that superposes.
2. device according to claim 1 is characterized in that, said negative pressure analog module comprises second source, the 3rd resistance and the 4th resistance;
Wherein, the positive pole of said second source is connected with said the 3rd resistance, and the negative pole of said second source is connected with said ground wire;
One end of said the 3rd resistance is connected with the positive pole of said second source, and the D utmost point of second technotron in the other end of said the 3rd resistance and said the 4th resistance, the said noise simulation module, first electric capacity in the said noise simulation module link to each other;
One end of said the 4th resistance is connected with said the 3rd resistance, said second technotron, said first electric capacity, and the other end of said the 4th resistance is connected with said ground wire.
3. device according to claim 2 is characterized in that, said noise simulation module comprises said first electric capacity, first resistance and said second technotron;
Wherein, said first electric capacity is parallelly connected with said the 4th resistance, and the non-earth terminal of said first electric capacity is connected with the D utmost point of said second technotron;
The positive pole of the 3rd power supply in one end of said first resistance and the said standard audio output module is connected; The other end of said first resistance is connected with the S utmost point of said second technotron; The resistance of second resistance in said first resistance and the said standard audio output module is identical, and said first resistance is pull-up resistor;
The D utmost point of said second technotron is connected with the non-earth terminal of said first electric capacity; The S utmost point of said second technotron is connected with the 7th resistance in said first resistance, the said negative circuit module, and the G utmost point of said second technotron is connected with said ground wire.
4. device according to claim 3 is characterized in that, said negative circuit module comprises the 6th resistance, said the 7th resistance, the 8th resistance, first power supply, first amplifier and the 4th electric capacity;
Wherein, an end of said the 6th resistance is connected with said the 7th resistance, said first amplifier's inverting input, and the other end of said the 6th resistance is connected with the output of said first amplifier;
One end of said the 7th resistance is connected with the S utmost point of said first resistance, said second technotron, and the other end of said the 7th resistance is connected with said the 6th resistance, said first amplifier's inverting input;
One end of said the 8th resistance is connected with the in-phase input end of said first amplifier, and the other end of said the 8th resistance is connected with said ground wire;
The positive pole of said first power supply is connected with the positive power source terminal of said first amplifier, and the negative pole of said first power supply is connected with said ground wire;
Said first amplifier's inverting input is connected with said the 7th resistance, said the 6th resistance; The in-phase input end of said first amplifier is connected with said the 8th resistance; The positive power source terminal of said first amplifier is connected with the positive pole of said first power supply; The negative power end of said first amplifier is connected with said ground wire, and the output of said first amplifier is connected with said the 4th electric capacity;
One end of said the 4th electric capacity is connected with the output of said first amplifier, and the other end of said the 4th electric capacity is connected with second electric capacity in the said standard audio output module.
5. device according to claim 4 is characterized in that, said standard audio output module comprises said second resistance, standard microphone MIC, said the 3rd power supply and said second electric capacity;
Wherein, an end of said second resistance links to each other with the positive pole of said the 3rd power supply, and the other end of said second resistance links to each other with said standard MIC;
The end of said standard MIC links to each other with said second resistance, said second electric capacity, and the other end of said standard MIC is connected with said ground wire, comprises said electret among the said standard MIC;
The positive pole of said the 3rd power supply links to each other with said second resistance, and the negative pole of said the 3rd power supply is connected with said ground wire;
One end of said second electric capacity is connected with said second resistance, said standard MIC, and the other end of said second electric capacity is connected with said the 4th electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204104139U CN202310065U (en) | 2011-10-25 | 2011-10-25 | Audio output device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204104139U CN202310065U (en) | 2011-10-25 | 2011-10-25 | Audio output device |
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| CN202310065U true CN202310065U (en) | 2012-07-04 |
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| CN2011204104139U Expired - Lifetime CN202310065U (en) | 2011-10-25 | 2011-10-25 | Audio output device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152670A (en) * | 2013-02-07 | 2013-06-12 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and earphone |
| CN103581793A (en) * | 2012-07-31 | 2014-02-12 | 无锡市葆灵电子科技有限公司 | Buffering device for acousto-electric conversion unit |
| CN114051199A (en) * | 2021-11-15 | 2022-02-15 | 联想(北京)有限公司 | Electronic device and control method thereof |
-
2011
- 2011-10-25 CN CN2011204104139U patent/CN202310065U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103581793A (en) * | 2012-07-31 | 2014-02-12 | 无锡市葆灵电子科技有限公司 | Buffering device for acousto-electric conversion unit |
| CN103152670A (en) * | 2013-02-07 | 2013-06-12 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and earphone |
| CN103152670B (en) * | 2013-02-07 | 2015-06-17 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and earphone |
| CN114051199A (en) * | 2021-11-15 | 2022-02-15 | 联想(北京)有限公司 | Electronic device and control method thereof |
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| TR01 | Transfer of patent right |
Effective date of registration: 20171109 Address after: Metro Songshan Lake high tech Industrial Development Zone, Guangdong Province, Dongguan City Road 523808 No. 2 South Factory (1) project B2 -5 production workshop Patentee after: Huawei terminal (Dongguan) Co.,Ltd. Address before: 518129 Longgang District, Guangdong, Bantian HUAWEI base B District, building 2, building No. Patentee before: HUAWEI DEVICE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: HUAWEI DEVICE Co.,Ltd. Address before: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: Huawei terminal (Dongguan) Co.,Ltd. |
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Effective date of registration: 20210423 Address after: Unit 3401, unit a, building 6, Shenye Zhongcheng, No. 8089, Hongli West Road, Donghai community, Xiangmihu street, Futian District, Shenzhen, Guangdong 518040 Patentee after: Honor Device Co.,Ltd. Address before: Metro Songshan Lake high tech Industrial Development Zone, Guangdong Province, Dongguan City Road 523808 No. 2 South Factory (1) project B2 -5 production workshop Patentee before: HUAWEI DEVICE Co.,Ltd. |
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Granted publication date: 20120704 |