CN100466467C - Automatic volume amplitude limiter with automatic gain controlling function - Google Patents
Automatic volume amplitude limiter with automatic gain controlling function Download PDFInfo
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- CN100466467C CN100466467C CNB2004100847404A CN200410084740A CN100466467C CN 100466467 C CN100466467 C CN 100466467C CN B2004100847404 A CNB2004100847404 A CN B2004100847404A CN 200410084740 A CN200410084740 A CN 200410084740A CN 100466467 C CN100466467 C CN 100466467C
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Abstract
The invention consists of programmable gain amplification circuit, peak hold circuit, ADC circuit, digital latch, digital comparison circuit, CPU, storage unit and time base control circuit. The peak voltage of output voice signal is detected and is compared with the preset value. According to the comparison result the gain amplification of the programmable amplification circuit will be adjusted and controlled by using the way of automatic gain control. The output sound volume can be controlled in the preset range.
Description
Technical field
The present invention relates to a kind of automatic volume amplitude limiter, relate in particular to a kind of automatic volume amplitude limiter, belong to electronic device field with automatic gain control function.
Background technology
Television broadcasting and radio broadcasting always are subjected to liking of the common people deeply, are the important medium that the common people extremely pay close attention to.In recent years, along with the high speed development of broadcasting industry, audio-video-frequency broadcast not only becomes the numerous common people to be understood current events politics and enjoys one of important medium of style entertainment, has also become one of important channel of various audio frequency and video exploitations.Now, no matter be the news category program of current events report Ask on hotspots and so on, or the general entertainment programme of the ball video display music of style and so on, all can be mingled with various exploitations often.In order to be different from normal news category or general entertainment programme, strengthen the propaganda report effect of audio frequency and video advertisement, improve the dynamics of the propaganda report of audio frequency and video advertisement, no matter be the public welfare exploitation, or various product class exploitations, various advertisers or ad production commercial city usually design some outstanding special tones or the sound that rings especially as the opening remarks of audio frequency and video exploitation content, come strong attraction spectators or audience with this, thereby reach the purpose of the effect that enlarges the audio frequency and video exploitation.Yet, this special tone or be not that everybody can both accept or everybody can both like than resonant occurring suddenly of ringing.Particularly in some special time, occasion or environment, this precipitate discordant tone or sound equipment are mostly to be that the people is fed up with, bring very big inharmonious being discord to environment, it can influence appreciator's the temperament and interest of watching and listening to, even the people's that slept soundly around can influencing sleep, other people in working and learning just with single-hearted devotion around perhaps disturbing, or the like.This type of example is very general, therefore, is badly in need of overcoming or avoiding the generation of this situation.
Find through literature search prior art, Chinese patent title " large screen colour TV receiver ", application number: 95219728.6, publication number: 2248432, this patent is applied to large screen colour TV receiver with volume control circuit, and the method for designing of this volume control is also applicable to similar television receiver.Yet, (for example look accepting device as most of sounds, television receiver or radio receiver) the same, prior art all is only to carry out the constant control of output amplitude at signal volume, and can not the change at random in the signal volume be controlled, thereby just be difficult to avoid the appearance of the problems referred to above in actual use.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the invention provides a kind of automatic volume amplitude limiter, make it can avoid or prevent the precipitate sound equipment that suddenly increases sharply effectively with automatic gain control function.
The present invention is achieved by the following technical solutions, the present invention includes: Programmable Gain Amplifier Circuit, peak holding circuit, adc circuit, digital latch circuit, digital comparator, CPU and memory cell and time base control circuit.Wherein, the mode that interconnects of each parts: the input of Programmable Gain Amplifier Circuit is connecting the audio signal of being imported, and exports the audio signal of being amplified; The crest voltage of the audio signal that peak holding circuit collection and maintenance are exported, and this signal inputed to the ADC change-over circuit, the crest voltage of peak sampling hold circuit being gathered and being kept by the ADC change-over circuit converts digital signal to; The digital signal that is converted to is stored in a digital latch circuit; CPU and memory cell are accepted the amplitude limit numerical value of the set audio output signal of user, and this amplitude limit value storage is in another digital latch circuit; Digital comparator is compared the peak value and the set amplitude limit numerical value of user of the output audio signal stored, the gain amplifier that its result relatively is stored in another digital latch circuit and is used to adjust and control Programmable Gain Amplifier Circuit; CPU and memory cell also change the Control Parameter of time base control circuit according to the set automatic amplitude limit run duration of user, and are coordinated and controlled the work schedule of whole automatic volume amplitude limiter by this time base control circuit.
The present invention also comprises: remote controller and remote controller are accepted circuit, so that the user adopts remote controller that the numerical value of the automatic amplitude limit of volume and the duration of the automatic amplitude limit work of volume are set.
The present invention is by detecting the crest voltage of output audio signal, and it is compared with the numerical value of predetermined set, adjust and control the gain amplifier of pga circuit in the mode of automatic gain control according to comparative result, control or be limited in the volume of being exported in the scope of institute's predetermined set effectively, with the acoustic maximum of constant maintenance output sound, thereby avoid or prevent the precipitate sound equipment that suddenly increases sharply.
Compared with prior art, the present invention can control or limit the output amplitude of audio signal effectively, thereby might avoid and prevent precipitate unusual sound equipment, for example, intert and look the unusual sound equipment that exploitation produced or the big sound in the program, thereby provide a kind of comfortable warmth and graceful quiet appreciation environment for spectators or audience at sound.The present invention not only can be widely used in the television broadcasting accepting device, can also be widely used in broadcast radio equipment such as radio receiver.
Description of drawings
Fig. 1 is the circuit block diagram of the embodiment of the invention
Fig. 2 is the circuit diagram of the gain control module of Programmable Gain Amplifier Circuit shown in Figure 1
Fig. 3 is the oscillogram that does not adopt audio output signal of the present invention
Fig. 4 is the oscillogram that adopts audio output signal of the present invention
Embodiment
Go through embodiment below with reference to accompanying drawing according to the automatic volume amplitude limiter of the AGC of having function of the present invention.Fig. 1 is the circuit block diagram of the embodiment of the invention, among the figure, the present invention includes: Programmable Gain Amplifier Circuit 1 is used for the amplification output of audio signal, and can changes the multiplication factor of its audio signal according to gain control signal; Peak holding circuit 2 is used to gather and keep the crest voltage of output audio signal; Adc circuit 3, the crest voltage that is used for peak holding circuit is gathered and kept converts digital signal to; Digital latch circuit 4 is respectively applied for the numerical value corresponding to the digital signal of the crest voltage of output audio signal and the comparative result that produced by the set amplitude limit numerical value of CPU and memory cell 6 and by digital comparator 5 that latchs by adc circuit 3 output; Digital comparator 5 is used for the peak voltage signal numerical value imported and amplitude limit numerical value is set comparing, and with the audio signal multiplication factor of comparative result control Programmable Gain Amplifier Circuit 1; CPU and memory cell 6 are used to constitute the control unit of whole device and the memory bank that can store various routines, user program and customer parameter; With time base control circuit 7, be used for the time sequential routine of parameter generating control peak holding circuit 2, ADC change-over circuit 3, digital latch circuit 4 and digital comparator 5 each parts work imported according to CPU and memory cell 6.
The mode that interconnects of each parts of the present invention: the input of Programmable Gain Amplifier Circuit 1 is connecting the audio signal Vi that is imported, and exports the audio signal Vo that is amplified on output; The crest voltage of the audio signal Vo that peak holding circuit 2 collections and maintenance are exported, and the gather signal voltage that keeps inputed to ADC change-over circuit 3, the crest voltage of the output audio signal Vo that peak holding circuit 2 is gathered and kept by ADC change-over circuit 3 converts digital signal to; The digital signal that is converted to is stored in a digital latch circuit 4a; CPU and memory cell 6 can be accepted the amplitude limit numerical value of the set audio output signal of user, and with this amplitude limit value storage in another digital latch circuit 4b; The amplitude limit numerical value that the user that the peak value of the output audio signal that digital comparator 5 is stored digital latch circuit 4b and another digital latch circuit 4b are stored is provided with is compared, and its result relatively is stored in another digital latch circuit 4a, adjusts and control the multiplication factor of Programmable Gain Amplifier Circuit 1 according to this comparative result; CPU and memory cell 6 also can change the Control Parameter of time base control circuit 7 according to the set automatic amplitude limit run duration of user, and produce time sequential routine of control peak holding circuits 2, ADC change-over circuit 3, digital latch circuit 4 and digital comparator 5 each parts work by this time base control circuit 7, coordinate and control the time sequential routine of whole device with time base control circuit 7.
Wherein, Programmable Gain Amplifier Circuit 1 by operational amplifier (for example is, and can change the multiplication factor of amplifier the ultra-low noise broadband operational amplifier LMH6624 that National Semiconductor produces) and the gain control module composition, according to the outer increase control signal that puts on gain control module.So in the closed loop loop, Programmable Gain Amplifier Circuit 1 forms automatic gain control (AGC) function.
As shown in Figure 2, be the circuit diagram of the gain control module of Programmable Gain Amplifier Circuit 1.Gain control module is made of feedback resistance and electronic control switch, among the figure, and R
FBy electronic control switch T
1, T
2... T
nWith feedback resistance R
F1, R
F2... R
FnIn parallel linking to each other constituted the feedback impedance of operational amplifier, its two ends V jointly
1And V
2Can connect the feedback end (or being referred to as virtual earth) of operational amplifier and the output of operational amplifier respectively, thereby form the feedback loop of operational amplifier; Wherein, V
gIt is the grid-control voltage of electronic control switch T.When changing the grid-control voltage of electronic switch T, (for example can change electronic switch T, during gating bidirectional analog switch CD4051) closure or openness state, thereby change the resistance of the feedback resistance of Programmable Gain Amplifier Circuit 1, and then change the gain multiplication factor of whole operational amplifier (for example, National Semiconductor produce ultra-low noise broadband operational amplifier LMH6624).
Compare with existing programmable gain amplifier technology, the application of conventional programmable gain amplifier is the purpose that is used for stablizing output gain mostly, and the present invention adopts the purpose of programmable gain amplifier is not the purpose that is used for stablizing output gain merely, and mostly is the purposes that are used to realize the restriction of output amplitude.Obviously, because both purpose differences, therefore application process separately is also different.In embodiments of the present invention, programmable gain amplifier 1 both can be used as the middle amplifying stage that drives of audio signal, also can be used as the final stage power-amplifier stage of audio signal, in operate as normal (promptly, the unusual of big amplitude do not appear, do not need to carry out the amplitude limit operation) time, the gain of programmable gain amplifier 1 or power amplification multiple maximum are to provide and to export the gain amplification or the power amplification of normal audio signal; And when the work that carry out amplitude limit operation (promptly, the unusual of the big amplitude that exists appears not wishing) time, programmable gain amplifier 1 can in time be adjusted or reduces its gain or power amplification multiple according to the difference between the amplitude of output signal and the set amplitude limit numerical value, thus avoid or reduce do not wish the sound of the unusual sound equipment that occurs.
For example, in the illustrated embodiment, the basic multiplication factor of operational amplifier is defined as 10 times, that is to say, the maximum amplification of operational amplifier is defined as 10; Preferably, the input impedance of operational amplifier is defined as 10K, feedback impedance is defined as 100K, and then when operational amplifier adopted inverting amplifier work, its gain amplifier multiple was 10 times.
If as required, with all feedback resistance R that can be in parallel and connect by electronic switch T
fQuantity n when being defined as 9, that is, feedback resistance comprises R
FAnd R
F1To R
F9Then the programming of programmable gain amplifier 1 gain classification also just is defined as 10 grades.At this moment, if each feedback resistance R
fAdopt the 1 listed parameter of tabulating down, as electronic control switch T
1To T
9Successively during conducting, then can obtain respectively one by one from 10 times, 9 times, 8 times ..., until 1 times gain multiplication factor.Wherein, maximum amplification can be used as the basic multiplication factor of Programmable Gain Amplifier Circuit 1.
| Label | Resistance (K) | Amplifier magnification ratio (doubly) | The difference of multiplication factor (%) |
| R F | 100 | 10 | |
| R f1 | 900 | 9 | -10 |
| R f2 | 720 | 8 | -20 |
| R f3 | 560 | 7 | -30 |
| R f4 | 420 | 6 | -40 |
| R f5 | 300 | 5 | -50 |
| R f6 | 200 | 4 | -60 |
| R f7 | 120 | 3 | -70 |
| R f8 | 60 | 2 | -80 |
| R f9 | 20 | 1 | -90 |
Table 1
In another embodiment, can be Pyatyi also with the hierarchical definition of programming gain, that is, and the feedback resistance R that selects for use four parallel connections to link to each other
F1-R
F4If the input impedance of operational amplifier is defined as 10K, feedback impedance is defined as 200K, and then when operational amplifier adopted inverting amplifier work, its gain amplifier multiple was 20 times.At this moment, if each feedback resistance adopts the parameter of tabulation 2 down, as electronic control switch T
1To T
4Successively during conducting, then can obtain respectively from 20 times, 10 times, 5 times, 2.5 times one by one until 5 grades of 1.25 times different gain multiplication factors.Wherein, 20 times of basic multiplication factors that can be used as Programmable Gain Amplifier Circuit of maximum amplification.
| Label | Resistance (K) | Amplifier magnification ratio (doubly) | The difference of multiplication factor (%) |
| R F | 200 | 20 | |
| R f1 | 200 | 10 | -50 |
| R f2 | 100 | 5 | -25 |
| R f3 | 50 | 2.5 | -12.5 |
| R f4 | 25 | 1.25 | -6.25 |
Table 2
What however, it is to be understood that is, looks precipitate audible sound of ringing in the broadcast program at sound, in the use of reality, preferably, adopts the defined parameter and the structure of table 2.
Be applicable to that electronic control switch in the gain control module of Programmable Gain Amplifier Circuit 1 can adopt the simulant electronic switch of any bi-directional, the quantity of its electronic switch is corresponding to the quantity of the feedback resistance in the above-mentioned gain control module of discussing 9.
Digital latch circuit 4 (4a and 4b) can adopt any type of digital latch circuit, wherein, the output control figure place of digital latch circuit 4a depends on the control progression of the change in gain of Programmable Gain Amplifier Circuit 1, and the output control figure place of digital latch circuit 4b then depends on the control figure place that adc circuit 3 and CPU and memory cell 6 are exported.Preferably, according to two kinds of structures of the change in gain of above-mentioned Programmable Gain Amplifier Circuit 1 control, digital latch circuit 4a can adopt 10 or 4 s' latch circuit respectively, and digital latch circuit 4b then can adopt 4 latch circuit.In addition, digital comparator 5 can be compared at the amplitude limit numerical value that under the control of time base control circuit 7 peak value and the user of the output audio signal stored in two digital latch circuit 4b is provided with, and its comparative result is stored in digital latch circuit 4a.Change in gain by digital latch circuit 4a control Programmable Gain Amplifier Circuit 1.
CPU and memory cell 6 can adopt any type of CPU processor circuit and any type of memory circuitry, for example, can be any type of CPU processor circuit and any type of memory circuitry that in present television receiver, has adopted, perhaps any type of CPU processor circuit and any type of memory circuitry that in present digital TV set-top box, has adopted, as long as it can realize the mutual control with the user, finish the acceptance and the control of the sliced data that the user imports.
Time base control circuit 7, can produce the control timing that the audio signal peak value sampling keeps and ADC changes of control peak holding circuit 2 and adc circuit 3 according to the output order of CPU and memory cell 6, produce the operation control timing of control figure latch cicuit 4 and digital comparator 5.
In addition, the present invention comprises that also remote controller and corresponding remote control accept circuit.Preferably, remote controller can adopt Infrared remote controller, and for example, circuit is accepted in Infrared remote controller that extensively adopts in the television receiver and corresponding remote control at present.
The masterful technique personage was understood in this area, above-mentioned each parts discussed or original paper can be any similar or identical parts or elements well known in the art, if can realize the present invention intrinsic technical characterictic.Describe the course of work that has the automatic volume amplitude limiter of AGC function according to the present invention in detail below with reference to Fig. 3 and Fig. 4, and other correlation technique feature of apparatus of the present invention.
Fig. 3 is the oscillogram that does not adopt audio output signal of the present invention; Fig. 4 is the oscillogram that adopts audio output signal of the present invention.By two figure relatively, it is more clear that work characteristics of the present invention and technical characterictic will become.
In Fig. 3, dotted line is represented input signal, and solid line is represented output signal.Owing to do not possess the function of the automatic amplitude limit of volume, output signal is amplified the signal of being imported with constant-gain or power amplification multiple, therefore, when even amplitude greatly unusually that institute do not wish to occur appears in input signal, output signal can provide with identical gain or power amplification multiple equally, therefore just might produce the defective and the deficiency of prior art discussed above.
In Fig. 4, dotted line is represented input signal, the output signal when solid line represents not adopt automatic amplitude limiter, the output signal when chain-dotted line is represented to have adopted according to automatic volume amplitude limiter 1 of the present invention.When operate as normal, Programmable Gain Amplifier Circuit 1 is amplified and output audio signal with basic gain or power amplification multiple (that is maximum amplification).
For example, at user's TV reception and when wishing that volume amplitude limit function can be set, the user can be according to hobby, habits and customs of oneself and the time that exploitation occurred and the duration of not liking, by the remote controller (not shown) such as the Infrared remote controller of television receiver, perhaps by the panel operation of television receiver, the duration that the export-restriction amplitude peak of signal volume, the time of limiting is set and limits.For example, the export-restriction amplitude with volume is adjusted to 20 by day; Be adjusted to 15 between the lights; Be adjusted to 10 or the like at dead of night, and for example, the time of the automatic amplitude limit of volume can be arranged on evening 7 up to 9 o'clock between the lights, the duration of wherein each automatic amplitude limit of volume is 3 minutes to 5 minutes, and at dead of night, the time of the automatic amplitude limit of volume can be set to evening 11 up to 2 o'clock mornings, and wherein the duration of each automatic amplitude limit of volume is 5 minutes to 10 minutes or longer time.Usually, the duration of the automatic amplitude limit of this volume, can determine according to the duration that exploitation in different programs, occurs.CPU and memory cell 6 receive after the parameters such as the set limited amplitude of user, the time of limiting and the duration of limiting, be provided with and control the output amplitude peak of automatic volume amplitude limiter 1, the time of operation and the time cycle of lasting amplitude limit operation in view of the above, and be provided with and control the time sequential routine that time base control circuit 7 generations are applicable to peak holding circuit 2, adc circuit 3, digital latch circuit 4 and digital comparator 5 each parts work.In the time cycle that the user limited, the crest voltage of peak holding circuit 2 continuous collecting output signals, and in the one period cycle in sampling time that sets, remaining the highest crest voltage.This cycle in sampling time can be determined according to the occurrence probability of the exploitation of big sound equipment and user's hobby and wish in the different periods by the user.For example, this cycle in crest voltage sampling time can be determined about 2 seconds to about 10 seconds or the longer time.That is to say, with the cycle in sampling time be one-period, peak holding circuit 2 is sustainable to remain on the peak-peak voltage in the cycle in sampling time.Under the control of time base control circuit 7, the adc circuit 3 conversion crest voltages that peak holding circuit 2 is kept in the cycle in sampling time, and the numerical value input digit latch cicuit 4a after will changing; The amplitude limit numerical value that the CPU element 5 of being stored among volume crest voltage numerical value that collects that digital comparator 5 is relatively stored in digital latch circuit 4a and the digital latch circuit 4a is provided with; When the output volume crest voltage numerical value that is collected during less than set amplitude limit numerical value, for example, t among Fig. 4
0To t
1Shown in time cycle, Programmable Gain Amplifier Circuit 1 is amplified and output audio signal with basic gain or power amplification multiple (that is, maximum amplification), the situation when not adopting automatic volume amplitude limiter; Otherwise, in case the volume peak value of output during greater than set amplitude limit numerical value, for example, t among Fig. 4
1To t
2Shown in time cycle, then Programmable Gain Amplifier Circuit 1 can gain or the power amplification multiple according to the variator that is provided with of CPU element, for example, adopt gain control method discussed above the amplitude of output signal will be decreased to half of original amplitude, and even less than half, also can come variator gain or power amplification multiple according to the crest voltage numerical value and the set amplitude limit numerical value difference between the two of institute's output audio signal, for example, reduce the voltage gain or the power gain of amplifier, make the crest voltage of the audio signal exported be limited within the scope of set limited amplitude and continue the set amplitude limit duration; As discussed above, this amplitude limit duration can be provided with according to user's demand.After the amplitude limit duration finished, Programmable Gain Amplifier Circuit 1 was just recovered normal gain or power amplification multiple, for example, and t among Fig. 4
2To t
3Shown in time cycle.Otherwise as this moment, the volume crest voltage numerical value of output then will repeat above-mentioned t still greater than set amplitude limit numerical value
1To t
2Operation in time cycle.In embodiments of the present invention, the gain multiple that the automatic amplitude limit of automatic volume amplitude limiter is decayed be normal gain amplifier (promptly, maximum gain amplifier) half, therefore when comparative result demonstrates volume output signal amplitude voltage and exceeds the amplitude limit amplitude, just automatic amplitude voltage with output signal reduces half, and the curve of output of its automatic amplitude limit is as shown in the chain-dotted line among Fig. 4.
Obviously, as discussed above, the present invention can realize the automatic amplitude limit function of output volume by automatic gain control function, thereby the sound that can avoid or eliminate precipitate unusual sound equipment effectively occurs.
Claims (5)
1. the automatic volume amplitude limiter with automatic gain control function is characterized in that, comprising:
Programmable Gain Amplifier Circuit (1) is used for the amplification output of audio signal, and changes the multiplication factor of its audio signal according to gain control signal,
Peak holding circuit (2) is used to gather and keep the crest voltage of output audio signal,
Adc circuit (3) is used for converting the crest voltage that peak holding circuit (2) is gathered and kept to digital signal,
Digital latch circuit (4), be respectively applied for the numerical value that latchs by the digital signal corresponding to the crest voltage of output audio signal of adc circuit (3) output, the comparative result that produced by the set amplitude limit numerical value of CPU and memory cell (6) and by digital comparator (5)
Digital comparator (5) is used for the peak voltage signal numerical value imported and amplitude limit numerical value is set comparing, and controls the gain or the power amplification multiple of described Programmable Gain Amplifier Circuit (1) with comparative result,
CPU and memory cell (6) are used to constitute the control unit of whole device, and comprise the memory bank of storing various routines, user program and customer parameter, and
Time base control circuit (7) is used for time sequential routine of parameter generating control peak holding circuit (2), ADC change-over circuit (3), digital latch circuit (4) and each parts work of digital comparator (5) imported according to CPU and memory cell (6),
The input of Programmable Gain Amplifier Circuit (1) is connecting the audio signal Vi that is imported, and on output, export the audio signal Vo that is amplified, peak holding circuit (2) is gathered and the crest voltage of the audio signal Vo that maintenance is exported, and the gather signal voltage that keeps inputed to ADC change-over circuit (3), the crest voltage of the output audio signal Vo that peak holding circuit (2) is gathered and kept by ADC change-over circuit (3) converts digital signal to, the digital signal that is converted to is stored in a digital latch circuit (4b), CPU and memory cell (6) are accepted the amplitude limit numerical value of the set audio output signal of user, and with this amplitude limit value storage in another digital latch circuit (4b), digital comparator (5) is compared the amplitude limit numerical value that the user who is stored in the peak value of the output audio signal stored in the digital latch circuit (4b) and another digital latch circuit (4b) is provided with, its result relatively is stored in another digital latch circuit (4a), and adjust and control the multiplication factor of Programmable Gain Amplifier Circuit (1) according to comparative result, CPU and memory cell (6) also according to the set automatic clipping time of user and automatically the amplitude limit run duration change the Control Parameter of time base control circuit (7), and by time base control circuit (7) generation control peak holding circuit (2), ADC change-over circuit (3), in the time sequential routine of digital latch circuit (4) and each parts work of digital comparator (5), coordinate and control time sequential routine of whole device with time base control circuit (7).
2. the automatic volume amplitude limiter with automatic gain control function according to claim 1 is characterized in that, described Programmable Gain Amplifier Circuit (1) comprises operational amplifier and gain control module;
Wherein, described gain control module is made of feedback resistance and electronic control switch, by electronic control switch (T
1, T
2... T
n) and feedback resistance (R
F1, R
F2... R
Fn) connecting respectively is n bar branch road, again with the parallel connection of n bar branch road, is constituted the feedback resistance (R of operational amplifier
f), wherein n is the integer more than or equal to 2, this feedback resistance (R
f) two ends V
1And V
2Connect the feedback end of operational amplifier and the output of operational amplifier respectively, thereby forming the feedback loop of operational amplifier; Described electronic control switch is by the change in gain of digital latch circuit (4) control Programmable Gain Amplifier Circuit (1).
3. the automatic volume amplitude limiter with automatic gain control function according to claim 2 is characterized in that, described electronic control switch is two-way gating analog switch.
4. according to claim 1 or 2 described automatic volume amplitude limiters with automatic gain control function, it is characterized in that, described Programmable Gain Amplifier Circuit (1) is used for the middle amplifying stage that drives of audio signal, the final stage power-amplifier stage that perhaps is used for audio signal, when operate as normal, its gain or power amplification multiple maximum, and when carrying out the work of amplitude limit operation, can reduce automatically or the gain or the power amplification multiple of step-down amplifier according to the set numerical value of user or according to the difference between the amplitude of output signal and the set amplitude limit numerical value.
5. the automatic volume amplitude limiter with automatic gain control function according to claim 1 is characterized in that, described peak holding circuit (2) is made of a sampling holder circuit and a voltage comparator circuit.
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Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2890260B1 (en) * | 2005-08-30 | 2007-10-12 | Thales Sa | METHOD AND DEVICE FOR CONTROLLING 2 LEVELS OF CRETE POWER FOR AN IMPULSE MODE AMPLIFIER |
| CN1941619B (en) * | 2005-09-30 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | Volume management system and method |
| WO2008021110A2 (en) * | 2006-08-09 | 2008-02-21 | Dolby Laboratories Licensing Corporation | Audio-peak limiting in slow and fast stages |
| CN101211563B (en) * | 2006-12-30 | 2011-12-21 | 英华达股份有限公司 | Method for processing an audio signal |
| TWI429301B (en) * | 2008-05-05 | 2014-03-01 | Mstar Semiconductor Inc | Volume control device and method |
| US8483639B2 (en) | 2008-05-06 | 2013-07-09 | Qualcomm Incorporated | AGC for slicer-based low power demodulator |
| US8332215B2 (en) * | 2008-10-31 | 2012-12-11 | Fortemedia, Inc. | Dynamic range control module, speech processing apparatus, and method for amplitude adjustment for a speech signal |
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| CN101740037B (en) * | 2008-11-21 | 2011-12-28 | 联芯科技有限公司 | Method for controlling automatic gain and dynamic range of voice based on sliding gain |
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| CN103762953B (en) * | 2014-01-16 | 2016-05-04 | 四川和芯微电子股份有限公司 | Automatic gain adjusting circuit |
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| CN108573709B (en) * | 2017-03-09 | 2020-10-30 | 中移（杭州）信息技术有限公司 | Automatic gain control method and device |
| CN111083406B (en) * | 2018-10-18 | 2022-06-14 | 浙江宇视科技有限公司 | Audio processing method and camera |
| CN113364418B (en) * | 2021-06-28 | 2023-03-21 | 贵州航天电子科技有限公司 | Program-controlled gain amplification circuit and signal control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1017862B (en) * | 1990-07-18 | 1992-08-12 | 机械电子工业部石家庄第五十四研究所 | Synthetic digital modulator |
| CN1042485C (en) * | 1993-07-05 | 1999-03-10 | 索尼公司 | Dark level restoring circuit for television receiver |
| JP2004289227A (en) * | 2003-03-19 | 2004-10-14 | Nec Corp | System for monitoring amplitude limit state |
-
2004
- 2004-12-02 CN CNB2004100847404A patent/CN100466467C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1017862B (en) * | 1990-07-18 | 1992-08-12 | 机械电子工业部石家庄第五十四研究所 | Synthetic digital modulator |
| CN1042485C (en) * | 1993-07-05 | 1999-03-10 | 索尼公司 | Dark level restoring circuit for television receiver |
| JP2004289227A (en) * | 2003-03-19 | 2004-10-14 | Nec Corp | System for monitoring amplitude limit state |
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| Publication number | Publication date |
|---|---|
| CN1614883A (en) | 2005-05-11 |
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