CN101742381A - Denoising drive circuit and method - Google Patents
Denoising drive circuit and method Download PDFInfo
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- CN101742381A CN101742381A CN200910238221A CN200910238221A CN101742381A CN 101742381 A CN101742381 A CN 101742381A CN 200910238221 A CN200910238221 A CN 200910238221A CN 200910238221 A CN200910238221 A CN 200910238221A CN 101742381 A CN101742381 A CN 101742381A
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- 238000012545 processing Methods 0.000 claims description 7
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- 238000005516 engineering process Methods 0.000 description 4
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- 238000012544 monitoring process Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
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Abstract
The invention discloses a denoising drive circuit, which comprises an operational amplifier, a capacitance module, a voice generating unit, a switch control module, and a first switch and a second switch which are controlled by the switch control module; when the variation rate of a voltage at the output terminal of the operational amplifier does not exceed a preset threshold, the first switch is closed and simultaneously the second switch is shut off; when the variation rate of the voltage signal reaches or exceeds the preset threshold, the first switch is shut off and simultaneously the second switch is closed. The invention also discloses a denoising method. The denoising drive circuit and the denoising method can detect whether an audio signal contains high-frequency noises which can cause POP Noise in real time, when detecting the high-frequency noises, through the switch control module, discharge the audio signal which contains the high-frequency noises through an AC grounding terminal, and then input the audio signal into a voice output device until the high-frequency noises in the audio signal disappear, thereby eliminating POP Noise quickly, accurately and effectively.
Description
Technical field
The present invention relates to noise reduction technology, be specifically related to a kind of denoising drive circuit and method.
Background technology
Along with the fast development of digital audio technology, the electronic equipment with voice reproducing function is also more and more.These electronic equipments generally use audio drive circuitry to drive flexible piezoelectric sound-generating devices (such as loudspeaker, earphone or audio amplifier etc.).Audio drive circuitry is made up of digital to analog converter (DAC) and operational amplifier usually, its operation principle can simply be described as: DAC receives the digital audio and video signals of previous stage circuit or equipment output, convert thereof into simulated audio signal, this analog signal is further amplified by described operational amplifier and is exported to described flexible piezoelectric sound-generating devices, is play by flexible piezoelectric sound-generating devices.
This audio drive circuitry drives flexible piezoelectric sound-generating devices and carries out in the process of voice playing, can often observe the phenomenon of a kind of POP of being called as Noise, the reason of its generation is: when in a big way sudden change takes place for the input terminal voltage of operational amplifier (increasing several times suddenly such as amplitude), operation principle according to operational amplifier, the output end voltage of this operational amplifier can produce corresponding sudden change, thereby fierce sudden change will take place in the analog signal of flexible piezoelectric sound-generating devices of exporting to described operational amplifier, correspondingly, strong and ear-piercing noise will appear on the flexible piezoelectric sound-generating devices, this noise can bring very offending experience to the user on the one hand, on the other hand, usually need to use some high sensitive elements in the flexible piezoelectric sound-generating devices (for example audio amplifier or earphone), and a little less than these high sensitive elements itself are highly brittle, therefore be easy to be destroyed by this instantaneous high-frequency noise.Therefore, the enterprise that manufactures and designs of audio drive circuitry is all striving to find the effective ways that suppress and eliminate POP Noise.
The method of Shi Yonging mainly is the chip exterior that the reference voltage input terminal of operational amplifier is drawn out to the audio drive circuitry place traditionally, and on described reference voltage input terminal, connect a very big electric capacity, it is slack-off that this electric capacity can produce the speed that bigger time constant allows the output end voltage of amplifier change, thereby reduce the intensity that POP Noise occurs to a certain extent.
Though this method can reduce the intensity that POP Noise occurs to a certain extent, also has some shortcomings: at first, this method only can reduce the intensity that POP Noise occurs, and can't fundamentally eliminate the appearance of POP Noise phenomenon; In addition, present audio drive circuitry all is integrated being arranged in the middle of the chip, and the very big capacitor of this capacitance can't come out on semiconductor chip in processing and manufacturing, this just means that this electric capacity must exist as the discrete component in the circuit, and this can greatly increase circuit cost in the processing and manufacturing process; On the other hand, the capacitor occupation space that capacitance is bigger is also bigger, and current audio drive circuitry is arranged on the integrated circuit form on the chip already, therefore can't provide enough big space to place this capacitor in the circuit at all, thereby cause this method to be difficult in actual applications implement; At last, capacitance is in case selected, and this scheme just can't be changed again, so flexibility is relatively poor.
Summary of the invention
The invention provides a kind of denoising drive circuit and method, can eliminate POP Noise simple and effectively.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
As seen from the above technical solutions, denoising drive circuit that the embodiment of the invention provides and method, the rate of change of the audio signal by real-time monitoring amplifier output also compares itself and preset threshold value, can detect in real time and whether comprise the high-frequency noise that causes POP Noise in the audio signal, and when detecting described high-frequency noise, the described audio signal that comprises high-frequency noise is discharged by exchanging earth terminal by switch control module, after high-frequency noise in described audio signal disappears just with its sound import output device once more, thereby can fast and effeciently eliminate POP Noise.Further, this scheme can also realize the characteristic of output audio is independently set and modulated expediently easily by the adjustment to described threshold value.
Description of drawings
Fig. 1 is the schematic diagram of denoising drive circuit structure in the embodiment of the invention.
Fig. 2 is the schematic flow sheet of noise-reduction method in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
By as seen to the description of prior art, therefore the method that prior art adopted is to delay the speed that operational amplifier output terminal voltage changes along with the input terminal voltage of undergoing mutation by passive mode, and this method is merely able to reduce and the intensity that suppresses POP Noise appearance but can't be eliminated the influence of POPNoise at all.
Unlike the prior art, the embodiment of the invention proposes a kind of denoising drive circuit, it forms structure as shown in Figure 1, it is to be noted, only show element related to the present invention and structure among the figure, omitted other circuit structures and element that those skilled in the art can be known according to prior art and common practise, described drive circuit comprises at least:
The output of operational amplifier 130 links to each other with an end of capacitance module 140 and the input of switch control module 120; The other end of capacitance module 140 links to each other with the audio signal input end of flexible piezoelectric sound-generating devices 110 by K switch 1, also link to each other with the reference signal input of flexible piezoelectric sound-generating devices 110, and the reference signal of described flexible piezoelectric sound-generating devices 110 input termination exchanges ground by K switch 2;
Described switch control module 120 is used for the rate of change of the output end voltage of calculation operations amplifier 130, when the rate of change of described output end voltage surpasses preset threshold, and Closing Switch K1 and stopcock K2 simultaneously; When the rate of change of described voltage signal meets or exceeds preset threshold, then stopcock K1 and Closing Switch K2 simultaneously.Need to prove that the inverter among Fig. 1 is not a solid element, but be used to represent that the circuit state of K1 and K2 is always opposite.
Wherein, further comprise in the switch control module 120: AD conversion unit 121 and digital signal processing unit 122;
Digital signal processing unit 122, be used for the digital voltage signal of AD conversion unit 121 outputs is handled, calculate the rate of change of described voltage signal, when the rate of change of described voltage signal surpasses preset threshold, Closing Switch K1 and while stopcock K2; When the rate of change of described voltage signal meets or exceeds preset threshold, then stopcock K1 and Closing Switch K2 simultaneously.
It is pointed out that in actual applications each module in the foregoing circuit both can be single circuit element, also can be the functional circuit that a plurality of circuit elements are formed, for example:
Described operational amplifier 130 can be Class-AB or Class-A class amplifier;
Described capacitance module 140 can be the circuit structure of one or more capacitances compositions;
Described flexible piezoelectric sound-generating devices 110 can be various audio-frequence player devices such as audio amplifier, earphone, earplug or loudspeaker;
And described K switch 1, K2, the element or the functional circuit that then can have the gate-controlled switch characteristic for the triode of voltage or Current Control, field effect transistor etc.In addition, Closing Switch K1 and the method for stopcock K2 simultaneously, both control signals that can be used for closed K1 simultaneously and turn-off K2 by output also can realize by the control signal that output simultaneously is used for the control signal of closed K1 and is used to turn-off K2; Turn-off K1 and closed K2 of while, can adopt similar method equally.
The specific implementation of above-mentioned each module, those skilled in the art all can adopt various possible modes according to known technology, and the embodiment of the invention is not done qualification.
In order to further describe the operation principle of the drive circuit that the embodiment of the invention provides, describe below in conjunction with a practical work process of described circuit:
At first, suppose under normal condition---be not comprise POP Noise in the audio signal, the output end voltage of operational amplifier (being the simulated audio signal under the normal condition) is V
pSin (2 π ft+ Φ), then the maximum of the rate of change of this audio signal is 2 π fV
p, the frequency range (being the scope of f) of the audio signal that can discern according to people's ear approximately is 20～20KHz again, the maximum that can draw described audio signal rate of change under normal circumstances is 40000 π V
pThereby, can further select threshold value according to the maximum of this rate of change.
According to the description of preamble as can be known, the basic reason that POP Noise produces is corresponding sudden change of voltage follow generation that the voltage of amplifier input is undergone mutation and caused the amplifier output, therefore, when high-frequency noise occurring in the audio signal of described amplifier output, represent to comprise POPNoise in the described audio signal, correspondingly, the audio signal of this moment is owing to comprise high-frequency noise, and its voltage changing rate certainly will will increase.A kind of feasible method is that the maximum that described threshold value is set to audio signal rate of change under normal circumstances (is described 40000 π V
p), when the rate of change that detects the actual voltage signal of amplifier output output when switch control module is higher than this threshold value, just think to comprise POP Noise in the output signal of this moment.Need to prove; owing to inevitably exist interference signals such as background noise in the circuit; and the operating characteristic difference of the senser in the described flexible piezoelectric sound-generating devices; therefore; usually can also choose greater or lesser threshold value as the case may be in actual applications, to satisfy under the different situations actual requirement for audio signal.Such as: if the senser in the flexible piezoelectric sound-generating devices is low frequency phonation unit (such as the low frequency cell in the audio amplifier), then can choose less threshold value (such as being 15000 π V this moment
p), be higher than 15000 π V to avoid frequency
pHigh-frequency signal this senser is damaged.
Suppose that threshold value selected in this example is 40000 π V
pWhen then the rate of change of monitoring described amplifier output end signal when switch control module is not higher than this threshold value, the output signal control K1 closure of described switch control module, K2 turn-off, then this moment, described audio signal was by capacitance module and sound import generation device, was play by described flexible piezoelectric sound-generating devices; And the rate of change of monitoring described amplifier output end signal when switch control module reaches or when being higher than this threshold value, the output signal control K1 of described switch control module turn-offs and the K2 closure, then this moment, the described audio signal that comprises high-frequency noise can connect interchange ground by K2, thereby the moment peak current that described high-frequency noise is formed discharges by K2, and not can with should moment peak current form POP Noise in the middle of being input to the sound generating apparatus; After described high-frequency noise finishes, thereby the rate of change of described audio signal can reduce the situation of getting back to less than threshold value again, after the switch control module of this moment detects the reduction of rate of change, will once more the K1 closure be turn-offed K2, thereby described drive circuit will return to the state with normal audio signal sound import generating apparatus.
On the basis of described drive circuit, the embodiment of the invention also further provides a kind of noise-reduction method, its handling process as shown in Figure 2, comprising:
Step 201: the rate of change of the output end voltage of switch control module calculation operations amplifier;
Step 202: when the rate of change of described voltage surpasses preset threshold, Closing Switch K1 and while stopcock K2; When the rate of change of described voltage signal meets or exceeds preset threshold, then stopcock K1 and Closing Switch K2 simultaneously.
By as seen above-mentioned, denoising drive circuit that the embodiment of the invention provides and method, the rate of change of the audio signal by real-time monitoring amplifier output also compares itself and preset threshold value, can detect in real time and whether comprise the high-frequency noise that causes POP Noise in the audio signal, and when detecting described high-frequency noise, the described audio signal that comprises high-frequency noise is discharged by exchanging earth terminal by switch control module, after high-frequency noise in described audio signal disappears just with its sound import output device once more, thereby can fast and accurately eliminate POP Noise effectively.Further, this scheme can also realize the characteristic of output audio is independently set and modulated expediently easily by the adjustment to described threshold value.
Claims (9)
1. a denoising drive circuit is characterized in that, this circuit comprises: operational amplifier, and capacitance module, flexible piezoelectric sound-generating devices, switch control module, and by first switch and the second switch of the output end signal of described switch control module control; The output of operational amplifier links to each other with an end of capacitance module and the input of switch control module respectively; The other end of capacitance module links to each other with the audio signal input end of flexible piezoelectric sound-generating devices by first switch, also link to each other with the reference signal input of flexible piezoelectric sound-generating devices by second switch, and the reference signal of described flexible piezoelectric sound-generating devices input termination exchanges ground;
Described switch control module is used for the rate of change of the output end voltage of calculation operations amplifier, and when the rate of change of described output end voltage surpassed preset threshold, closed first switch also turn-offed second switch simultaneously; When the rate of change of described voltage signal meets or exceeds preset threshold, then turn-off first switch and while closed second switch.
2. circuit according to claim 1 is characterized in that, described switch control module comprises:
AD conversion unit, the output end voltage that is used for operational amplifier is a digital signal by analog signal conversion, and exports to digital signal processing unit;
Digital signal processing unit, be used for the digital voltage signal of AD conversion unit output is handled, calculate the rate of change of described voltage signal, when the rate of change of described voltage signal did not surpass preset threshold, closed first switch also turn-offed second switch simultaneously; When the rate of change of described voltage signal meets or exceeds preset threshold, then turn-off first switch and while closed second switch.
3. circuit according to claim 2 is characterized in that, described operational amplifier comprises Class-A class or Class-AB class amplifier.
4. circuit according to claim 2 is characterized in that, the circuit structure of described capacitance module for being formed by one or more capacitance combination in any.
5. according to each described circuit in the claim 1 to 4, it is characterized in that described first switch and second switch are element or the functional circuit with gate-controlled switch characteristic.
6. noise-reduction method, be used for drive circuit is carried out noise reduction process, described drive circuit comprises operational amplifier, capacitance module, flexible piezoelectric sound-generating devices, switch control module, and by first switch and the second switch of the output end signal of described switch control module control; The output of operational amplifier links to each other with an end of capacitance module and the input of switch control module respectively; The other end of capacitance module links to each other with the audio signal input end of flexible piezoelectric sound-generating devices by first switch, also link to each other with the reference signal input of flexible piezoelectric sound-generating devices by second switch, and the reference signal of described flexible piezoelectric sound-generating devices input termination exchanges ground; It is characterized in that this method comprises:
Switch control module is measured the rate of change of the output end voltage of described operational amplifier;
When the rate of change of described voltage did not surpass preset threshold, closed first switch also turn-offed second switch simultaneously; When the rate of change of described voltage signal meets or exceeds preset threshold, turn-off first switch and while closed second switch.
7. method according to claim 6 is characterized in that, described operational amplifier comprises Class-A class or Class-AB class amplifier.
8. method according to claim 6 is characterized in that, the circuit structure of described capacitance module for being formed by one or more capacitance combination in any.
9. according to each described method in the claim 6 to 8, it is characterized in that described first switch and second switch are element or the functional circuit with gate-controlled switch characteristic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910238221A CN101742381A (en) | 2009-11-23 | 2009-11-23 | Denoising drive circuit and method |
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| CN200910238221A CN101742381A (en) | 2009-11-23 | 2009-11-23 | Denoising drive circuit and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093104A (en) * | 2014-07-10 | 2014-10-08 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP sound of earphone |
| CN104378715A (en) * | 2014-11-25 | 2015-02-25 | 小米科技有限责任公司 | Device and method for lowering earphone POP sound |
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN105612763A (en) * | 2013-09-04 | 2016-05-25 | 美商楼氏电子有限公司 | Slew rate control apparatus for digital microphones |
| CN107370466A (en) * | 2011-09-16 | 2017-11-21 | 意法半导体研发(深圳)有限公司 | Amplifying circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370466A (en) * | 2011-09-16 | 2017-11-21 | 意法半导体研发(深圳)有限公司 | Amplifying circuit |
| CN105612763A (en) * | 2013-09-04 | 2016-05-25 | 美商楼氏电子有限公司 | Slew rate control apparatus for digital microphones |
| CN105612763B (en) * | 2013-09-04 | 2017-08-22 | 美商楼氏电子有限公司 | Slew-rate control apparatus for digital microphone |
| CN104093104A (en) * | 2014-07-10 | 2014-10-08 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP sound of earphone |
| CN104378715A (en) * | 2014-11-25 | 2015-02-25 | 小米科技有限责任公司 | Device and method for lowering earphone POP sound |
| CN104378715B (en) * | 2014-11-25 | 2018-07-06 | 小米科技有限责任公司 | The device and method for reducing earphone POP sounds |
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN105263087B (en) * | 2015-11-18 | 2020-01-10 | 广东威创视讯科技股份有限公司 | Audio output circuit for eliminating startup and shutdown impact sound |
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Application publication date: 20100616 |