CN102655619A - Low-frequency amplitude-limiting control system for loudspeakers - Google Patents
Low-frequency amplitude-limiting control system for loudspeakers Download PDFInfo
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- CN102655619A CN102655619A CN2012100861143A CN201210086114A CN102655619A CN 102655619 A CN102655619 A CN 102655619A CN 2012100861143 A CN2012100861143 A CN 2012100861143A CN 201210086114 A CN201210086114 A CN 201210086114A CN 102655619 A CN102655619 A CN 102655619A
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Abstract
The invention discloses a low-frequency amplitude-limiting control system for loudspeakers. The low-frequency amplitude-limiting control system comprises an audio amplifier, the negative voltage input end of the audio amplifier is connected with an audio signal input end, and the signal output end of the audio amplifier is connected with an audio signal output module; the control system also comprises a low-pass filtering module and a transconductance amplifier; and the signal output end of the amplifier, the low-pass filtering module, a current input/output port of the transconductance amplifier and the negative voltage input end of the audio amplifier are sequentially connected so as to form a feedback loop. According to the invention, through additionally arranging a feedback loop, the audio frequency of the negative voltage input end of the audio amplifier is controlled under a proper sound pressure, so that an amplitude-limiting effect is achieved, and finally, the audio frequency outputted by the loudspeaker is not too low, thereby effectively reducing a distortion phenomenon under the conditions of large signals and high dynamics, and ensuring that the loudspeaker has a good loudspeaking effect.
Description
Technical field
The present invention relates to the audio frequency control technology field of loud speaker, is a kind of loud speaker low frequency amplitude limit control system specifically.
Background technology
At present, the small portable speaker system receives the bore restriction of volume and loud speaker now, and the frequency response bandwidth of loud speaker low-frequency range is very narrow, and it is less to bear power.
During this time, in order to bring into play the low-frequency effect of small-bore loud speaker to greatest extent, the designer tends in amplifier circuit, be low frequency EQ and handles, in order to promote low-frequency effect.But because of small-bore power of loudspeaker bears for a short time, when the output of user's source of sound is bigger, or the low frequency of music itself is by force the time; Will cause the distorsion of loud speaker; Cause the serious distortion phenomenon when large-signal reaches greatly dynamically, influence the effects,sound of loud speaker, more can damage loud speaker when serious.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of and can effectively reduce large-signal and big distortion phenomenon, loud speaker low frequency amplitude limit control system simple in structure dynamically the time.
Goal of the invention of the present invention is achieved in that a kind of loud speaker low frequency amplitude limit control system; It comprises audio amplifier; The negative voltage input of audio amplifier is connected with the sound signal input; The signal output part of audio amplifier is connected with the sound signal output module; It is characterized in that: it also includes low-pass filtering module and trsanscondutance amplifier, and the electric current input/output port of the signal output part of said amplifier, low-pass filtering module, trsanscondutance amplifier and the negative voltage input of audio amplifier connect into feedback loop in order.
Loud speaker low frequency amplitude limit control system of the present invention; It is as the further improvement of technical scheme; It also is provided with half filter modular converter, filtering voltage comparator and current conversion module, and the signal output part of said audio amplifier, the signal input end of partly filtering modular converter, voltage comparator, current conversion module and trsanscondutance amplifier are connected to power circuit in order.
Concrete preferred implementation result, above-mentioned loud speaker low frequency amplitude limit control system, said low-pass filtering module is a single order RC filter circuit.
The present invention compares with the audio control circuit of loud speaker in the prior art, has the following advantages:
The present invention is on the sound signal output circuit of loud speaker, and the signal output part, low-pass filtering module, the electric current input/output port of trsanscondutance amplifier and the negative voltage input of audio amplifier that have additional by amplifier connect into feedback loop in order, during this control system work; Only there is low frequency signal behind the signal output part process low-pass filtering module because of amplifier; Low frequency signal feeds back to the negative voltage input of audio amplifier after trsanscondutance amplifier amplifies, form low frequency feedback audio frequency, and the audio frequency of the negative voltage input of audio amplifier is controlled under the suitable acoustic pressure; Realize the amplitude limit effect; Finally make the audio frequency of loud speaker output be unlikely to low, effectively reduce large-signal and big distortion phenomenon dynamically the time, guarantee that loud speaker has loud-speaking effect preferably; Especially the small portable speaker system had the better protect effect; Simultaneously, this control system is simple in structure, and control is convenient simple and easy.
Description of drawings
Accompanying drawing 1 is the functional-block diagram of most preferred embodiment of the present invention.
Accompanying drawing 2 is the circuit structure diagram of most preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further description.
According to shown in Figure 1; Loud speaker low frequency amplitude limit control system of the present invention; It comprises audio amplifier 1, and the negative voltage input of audio amplifier 1 is connected with sound signal input 2, and the signal output part of audio amplifier 1 is connected with sound signal output module 3.Simultaneously; This amplitude limit control system also includes low-pass filtering module 4 and trsanscondutance amplifier 5; Among the present invention; The electric current input/output port of the signal output part of amplifier, low-pass filtering module 4, trsanscondutance amplifier 5 and the negative voltage input of audio amplifier 1 connect into feedback loop in order, and this low-pass filtering module 4 is a single order RC filter circuit.The output signal of audio amplifier 1 is through behind the low-pass filtering module 4; Have only low frequency signal to get into trsanscondutance amplifier 5; Low frequency signal is amplified into the negative voltage input of audio amplifier 1 through trsanscondutance amplifier 5; Form low frequency feedback audio frequency, and the audio frequency of the negative voltage input of audio amplifier 1 is controlled under the suitable acoustic pressure, realize the amplitude limit effect of input.
Loud speaker low frequency amplitude limit control system of the present invention; It is as the further improvement of technical scheme; It also is provided with half filter modular converter 6, voltage comparator 7 and current conversion module 8, and the signal output part of said audio amplifier 1, the signal input end of partly filtering modular converter 6, voltage comparator 7, current conversion module 8 and trsanscondutance amplifier 5 are connected to power circuit in order.During this time; The signal output part of audio amplifier 1 is through partly filtering the signal input end that modular converter 6, filtering voltage comparator 7 and current conversion module 8 get into trsanscondutance amplifier 5; Form the control signal of trsanscondutance amplifier 5; Specifically be to be input to the control of signal of the current input terminal of trsanscondutance amplifier 5 by low-pass filtering module 4 with opposing, during, because there is overlapping low frequency part in the frequency of the signal of the frequency of control signal and the current input terminal that low-pass filtering module 4 is input to trsanscondutance amplifier 5; So this control signal can be preferably according to controlling trsanscondutance amplifier 5 to export comparison signal preferably with the frequency part.
During this time; The audio amplifier 1 that the present invention adopted, low-pass filtering module 4, trsanscondutance amplifier 5, partly filter conventional original paper or the circuit module that modular converter 6, voltage comparator 7 and current conversion module 8 all are field of electronic devices, the designer all can purchase above-mentioned device easily and constitute this control system.
Fig. 2 is the circuit structure diagram of the embodiment of the invention, in conjunction with scheming, carries out the analysis in a step again in the face of the concrete operation principle of circuit down.
Audio signal is input to the negative voltage input of audio amplifier 1 through resistance R 3 by signal input part part., audio amplifier 1, gives low-pass filtering module 4 respectively after amplifying from signal output part output; Partly filter the output of modular converter 6 and signal and partly export signal.
Signal output is partly amplified and output through amplifier U1B by resistance R 2 inputs.
Low-pass filtering module 4 is by resistance R 8, and capacitor C 4 is formed single order RC filter circuit, will amplify trsanscondutance amplifier 5 is carried out delivering to after low pass is handled in the back from the signal of signal output part output input port by audio amplifier 1.
Partly filter the all-wave signal that modular converter 6 receives resistance R 7, resistance R 15 and all convert half-wave to, then by amplifier U1C output, this output signal warp is exported to voltage comparator 7U1D through resistance R 19, diode D1.
Current conversion is made up of triode Q2, resistance R 22, capacitor C 3, resistance R 12 and resistance R 18; This current conversion module 8 will change into electric current by the audio pulse of partly filtering modular converter 6 outputs; Output to the signal input end of trsanscondutance amplifier 5 subsequently, control signal is provided.
The low-frequency input signal of trsanscondutance amplifier 5 is provided by low-pass filtering module 4; Control signal control through current conversion module 8 outputs; Amplify the back and be transported to the negative voltage input of audio amplifier 1, form low frequency feedback audio frequency by output port, because of the signal output part of amplifier through low-pass filtering module 4; So only feed back low frequency signal, the low frequency that just small-bore loud speaker can not be sent is controlled under the suitable acoustic pressure.
The present invention is through setting up feedback loop; Audio frequency to the negative voltage input of audio amplifier 1 is controlled under the suitable acoustic pressure; Realize the amplitude limit effect, finally make the audio frequency of loud speaker output be unlikely to low, effectively reduce large-signal and big distortion phenomenon dynamically the time; Guarantee that loud speaker has loud-speaking effect preferably; Especially the small portable speaker system is had the better protect effect, can the low-frequency effect of small-bore loud speaker be sent under medium and small volume status, and under big volume, also be unlikely distorsion.
Claims (3)
1. loud speaker low frequency amplitude limit control system; It comprises audio amplifier (1); The negative voltage input of audio amplifier (1) is connected with sound signal input (2); The signal output part of audio amplifier (1) is connected with sound signal output module (3); It is characterized in that: it also includes low-pass filtering module (4) and trsanscondutance amplifier (5), and the electric current input/output port of the signal output part of said amplifier (2), low-pass filtering module (4), trsanscondutance amplifier (5) and the negative voltage input of audio amplifier (1) connect into feedback loop in order.
2. loud speaker low frequency amplitude limit control system according to claim 1; It is characterized in that: it also is provided with half filter modular converter (6), filtering voltage comparator (7) and current conversion module (8), and the signal output part (2) of said audio amplifier (1), the signal input end of partly filtering modular converter (6), voltage comparator (7), current conversion module (8) and trsanscondutance amplifier (5) are connected to power circuit in order.
3. loud speaker low frequency amplitude limit control system according to claim 2 is characterized in that: said low-pass filtering module (4) is a single order RC filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100861143A CN102655619A (en) | 2012-03-28 | 2012-03-28 | Low-frequency amplitude-limiting control system for loudspeakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100861143A CN102655619A (en) | 2012-03-28 | 2012-03-28 | Low-frequency amplitude-limiting control system for loudspeakers |
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| Publication Number | Publication Date |
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| CN102655619A true CN102655619A (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100861143A Pending CN102655619A (en) | 2012-03-28 | 2012-03-28 | Low-frequency amplitude-limiting control system for loudspeakers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418246A (en) * | 2018-04-26 | 2019-11-05 | 辛纳普蒂克斯公司 | Stablize high performance audio amplifier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069606A (en) * | 1991-08-13 | 1993-03-03 | 松下电器产业株式会社 | The amplifier that is used for amplitude limiter |
| US6288604B1 (en) * | 1998-02-03 | 2001-09-11 | Broadcom Corporation | CMOS amplifier providing automatic offset cancellation |
| CN1487520A (en) * | 2002-08-30 | 2004-04-07 | 三星电子株式会社 | Data amplitude limiter for optical disk system and data slicing method |
| CN1525639A (en) * | 2003-02-26 | 2004-09-01 | 李相前 | A low distortion Class D amplifier |
| CN1677511A (en) * | 2004-03-24 | 2005-10-05 | 三洋电机株式会社 | Slice level control circuit |
-
2012
- 2012-03-28 CN CN2012100861143A patent/CN102655619A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069606A (en) * | 1991-08-13 | 1993-03-03 | 松下电器产业株式会社 | The amplifier that is used for amplitude limiter |
| US6288604B1 (en) * | 1998-02-03 | 2001-09-11 | Broadcom Corporation | CMOS amplifier providing automatic offset cancellation |
| CN1487520A (en) * | 2002-08-30 | 2004-04-07 | 三星电子株式会社 | Data amplitude limiter for optical disk system and data slicing method |
| CN1525639A (en) * | 2003-02-26 | 2004-09-01 | 李相前 | A low distortion Class D amplifier |
| CN1677511A (en) * | 2004-03-24 | 2005-10-05 | 三洋电机株式会社 | Slice level control circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418246A (en) * | 2018-04-26 | 2019-11-05 | 辛纳普蒂克斯公司 | Stablize high performance audio amplifier |
| CN110418246B (en) * | 2018-04-26 | 2022-06-21 | 辛纳普蒂克斯公司 | Method and system for improving audio amplifier stability |
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| C06 | Publication | ||
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| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Tung Chung town Nansha District Guangzhou city Guangdong province 510453 Sansha Road No. 13 Applicant after: GUANGZHOU HIVI ELECTROACOUSTIC TECHNOLOGY CO., LTD. Address before: Tung Chung town Panyu District Sansha village of Guangzhou city in Guangdong province 510453 Applicant before: Guangzhou Hivi Electrical Appliance Co., Ltd. |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: HUIWEI ELECTRIC CO., LTD., GUANGZHOU TO: GUANGZHOU HUIWEI ELECTROACOUSTIC TECHNOLOGY CO., LTD. |
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| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120905 |