CN105281695B - A kind of compression limiter - Google Patents
A kind of compression limiter Download PDFInfo
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- CN105281695B CN105281695B CN201510862328.9A CN201510862328A CN105281695B CN 105281695 B CN105281695 B CN 105281695B CN 201510862328 A CN201510862328 A CN 201510862328A CN 105281695 B CN105281695 B CN 105281695B
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Abstract
The present invention provides a kind of compression limiters, comprising: gain regulation module exports the first output signal according to the input signal of compression limiter；And according to the first output signal, the first signal gain of clipping is compressed in feedback regulation for realizing input signal；Public address module is connect with gain regulation module, and public address module carries out power amplification to the first output signal that gain regulation module exports, and exports the second output signal；Clipping control module, connect with public address module, the clipping distortion occurred in the second output signal that clipping control module is exported according to public address module, the second signal gain that feedback regulation is amplified for realizing the first output signal power；Limiter is compressed to export the second output signal control for compressing limiter output in clipping amplitude under the first signal gain and the collective effect of second signal gain.The clipping distortion occurred in its second output signal of automatic elimination, improves the output sound quality of public address module, promotes user experience.
Description
Technical field
The present invention relates to audio signal processing technique field more particularly to a kind of compression limiters.
Background technique
The sense of hearing dynamic range of the mankind is up to 120dB (decibel), and the maximum acoustic that can be heard is bigger than minimum sound by 1,000,000
Times.When public address equipment is in playing audio signal, it is often limited to the maximum that the bottom of public address equipment itself is made an uproar with public address equipment
Fan-out capability (dynamic range of equipment), e.g., the bottom that lesser sound can be submerged in system make an uproar in can not hear, and maximum sound
Sound will receive the limitation of public address equipment maximum output ability, or even will appear clipping distortion.In order to solve this problem, it introduces
The dynamic of voice signal is handled, by reducing the dynamic range of sound, make to amplify set can normal play, compress limiting technology
Just belong to one such technology.
The basic principle of compression limiting technology is usually: first improving the entire gain of source of sound, flood lesser sound will not
Not in the bottom of system is made an uproar, it can be heard；When voice signal reaches the threshold threshold value of setting, according to the compression ratio of setting,
The gain of reduction system, to reduce the dynamic range of sound；When voice signal has reached the maximum output ability of system, output
No longer increase with the increase of input, prevents the clipping distortion of voice signal, the input signal of system and output letter during being somebody's turn to do
Number relational graph as shown in Figure 1, diagram in V1 be above-mentioned setting threshold threshold value, V2 be above-mentioned system reach maximum output energy
The voltage value of power, VLFor the clipping amplitude of system, and the region that the amplitude of input signal is 0~V1 is linear zone, input signal
Amplitude be V1~V2 region be compressional zone, the amplitude of input signal is more than that the region of V2 is clipping area.In addition, when system
When dynamic range is smaller, the algorithm with clipping function will use to realize above-mentioned purpose, as shown in Fig. 2, VLFor the limit of system
Width amplitude, when the amplitude of input signal reaches V, output no longer increases with the increase of input, corresponding with Fig. 1, input letter
Number amplitude be 0~V region be linear zone, the amplitude of input signal is more than that the region of V is clipping area.
During compressing clipping, two parameters are critically important, respectively starting time and release time.Wherein, start
Time is to control the time in threshold threshold value beyond threshold threshold value to signal from system detection to signal；Release time is when letter
After number becoming smaller, the time that the change in gain of clipping is eliminated is compressed, as shown in Figure 3.It can be seen from the figure that when input signal reaches
The maximum output ability of system, then system reduces the gain of system according to preset starting time A, until by output signal control
System is in threshold threshold value；When input signal becomes smaller, system increases the gain of system according to preset release time B in right amount, increases
Output signal is simultaneously controlled in threshold threshold value.
But during existing compression limiter starts the time, due to various reasons, easily there is slicing in output signal
The phenomenon that truncation.Such as, the starting time is longer, it may appear that the phenomenon that slicing truncation；For another example, when occur output loading become weight, power supply
When the application conditions such as voltage is lower, temperature is got higher change, the dynamic range of public address equipment can reduce, and also will appear slicing at this time and cut
The phenomenon that top, waits.System can generate a large amount of harmonic distortion signal when there is the phenomenon that slicing truncation therewith, to cause
Equipment sense of hearing is deteriorated, and is easily damaged loudspeaker.
Summary of the invention
In view of the above-mentioned problems, the present invention is intended to provide a kind of compression limiter, is eliminated existing by a clipping control module
There is the clipping distortion occurred in compression limiter.
Technical solution provided by the invention is as follows:
A kind of compression limiter, comprising: gain regulation module, public address module and clipping control module, wherein
The gain regulation module exports the first output signal according to the input signal of the compression limiter；And according to
The first signal gain of clipping is compressed in first output signal, feedback regulation for realizing the input signal；
The public address module is connect with the gain regulation module, and the public address module is defeated to the gain regulation module
The first output signal out carries out power amplification, exports the second output signal；
The clipping control module, connect with the public address module, and the clipping control module is according to the public address module
The clipping distortion occurred in second output signal of output, feedback regulation are amplified for realizing first output signal power
Second output signal of the compression limiter output is controlled and is exported in clipping amplitude by second signal gain；
The compression limiter will be described under first signal gain and the collective effect of the second signal gain
The second output signal control of compression limiter output is exported in clipping amplitude.
In the technical scheme, amplified by the input signal that gain regulation module inputs system, compress and
Clipping export the first output signal, then by public address module to the first output signal amplify generation the second output signal into
Row output, in order to eliminate the clipping distortion as caused by public address module, using clipping control module according to there is clipping distortion
Second output signal carries out feedback regulation to the gain of the first output signal, to improve the sense of hearing of public address equipment.Here
Second signal gain is actually the gain that public address module (public address equipment) carries out power amplification to the first input signal.And
Since gain regulation module and public address module are series relationships, the entire system signal gain for compressing clipping is actually first
The product of signal gain and second signal gain, therefore compression limiter provided herein is the common work in two signal gains
With the clipping distortion occurred in the second output signal of lower elimination.
It is further preferred that including: distortion detector, the second sequence controller and gain in the clipping control module
Controller, wherein
The distortion detector is connect with the public address module, and the distortion detector is for detecting the public address module
Whether there is clipping distortion in second output signal of output；
Second sequence controller, connect with the distortion detector and the gain controller respectively, cuts when described
Wave detector detects that clipping distortion occurs in second output signal, and second sequence controller is according to second output
Signal adjusts the second signal gain, and second signal gain adjusted is sent to the gain controller；
The gain controller is connect with second sequence controller and the public address module, the gain control respectively
The second signal gain that device processed is exported according to second sequence controller carries out gain control to first output signal.
In the technical scheme, whether there is clipping distortion in the second output signal of distortion detector real-time detection, when
There is clipping distortion, then the then adjust automatically second signal gain of the second sequence controller, rapidly by the width of the second output signal
Value control eliminates the clipping distortion in slicing amplitude；Certainly, if not occurring clipping distortion in the second output signal, the
Two sequence controllers do not work and (are not adjusted to second signal gain, second signal gain is maintained at original level).
It is further preferred that in second sequence controller:
When there is clipping distortion in second output signal, and second sequence controller starts according to preset slicing
Between, reduce the yield value of the second signal gain；
When the second output signal clipping distortion is eliminated, when second sequence controller is discharged according to preset slicing
Between, increase the yield value of the second signal gain.
It is further preferred that second sequence controller is according to pre- when clipping distortion occurs in second output signal
If slicing start the time, reduce the yield value of the second signal gain；And within the slicing starting time, described second
The yield value reduction speed of signal gain is greater than the yield value reduction speed of first signal gain.
It is further preferred that including a variable gain amplifier, compression control amplifier, ratio in the gain regulation module
Compared with device and the first sequence controller, wherein
The variable gain amplifier is connect with first sequence controller, defeated according to first sequence controller
The first signal gain out amplifies input signal, exports the first output signal；
The compression control amplifier, connect with the variable gain amplifier, is adjusted according to first output signal
Reference voltage；
The comparator is connect with the variable gain amplifier and the compression control amplifier, the comparison respectively
The amplitude of first output signal and the reference voltage are compared by device；
First sequence controller, connect with the variable gain amplifier and the comparator respectively, and described first
Sequence controller adjusts the first signal gain according to the comparison result of the comparator, and the first signal gain adjusted is defeated
Enter the variable gain amplifier.
It is further preferred that in the compression control amplifier:
When the amplitude of first output signal is less than compression threshold threshold value, the compression control amplifier is by the ginseng
Examine voltage high；
When the amplitude of first output signal is between compression threshold threshold value and clipping threshold threshold value, the compression control
Amplifier processed generates reference voltage according to preset compression ratio；
When the amplitude of first output signal is greater than clipping threshold threshold value, the compression control amplifier is by the reference
Voltage constant control corresponding voltage value in the compression limiter output violent change.
It is further preferred that in the comparator:
When the amplitude of first output signal is greater than the reference voltage of compression control amplifier output, it is transmitted into and opens
Time command is moved to first sequence controller；
When the amplitude of first output signal is less than the reference voltage of compression control amplifier output, it is transmitted into and releases
Time command is put to first sequence controller.
It is further preferred that in first sequence controller:
When first sequence controller receives the time command into starting, the first sequence controller root
According to the preset starting time, reduce the yield value of first signal gain；
When first sequence controller receives the instruction into release time, the first sequence controller root
According to preset release time, increase the yield value of first signal gain.
It is further preferred that the starting time starts the time much larger than the slicing.
In the technical scheme, the starting time is to detect that the first output signal has exceeded clipping threshold threshold value to being controlled
Make the time in clipping threshold threshold value；And the slicing starting time is that the second output signal clipping distortion (the second output occurs
The amplitude of signal has exceeded slicing amplitude) to being controlled the time in slicing amplitude.And under normal circumstances, slicing amplitude is past
Toward greatly than clipping amplitude (clipping threshold threshold value and clipping amplitude Cheng Ding smaller than clipping amplitude than relationship and clipping threshold threshold value),
Therefore the starting time is certainly longer than the slicing starting time.Again it is desirable that elimination clipping is distorted as early as possible, therefore the slicing starting time is past
Toward can be arranged it is shorter, still here starting the time can more than slicing start the time it is long.
Compression limiter provided by the invention, can bring it is following the utility model has the advantages that
In the present invention, gain regulation module feeds back the first signal gain according to the first output signal from output
It adjusting, clipping control module carries out feedback regulation to the second gain signal according to the second output signal for clipping distortion occur,
To be eliminated under the first signal gain and the collective effect of second signal gain in the second output signal due to starting the time
The too long or public address module as caused by when output loading becomes weight, the application conditions variation such as supply voltage is lower, temperature is got higher
Reduced dynamic range and the clipping distortion occurred improve the output sound quality of public address module, promote user experience；
Further more, in the present invention, distortion detector and the second sequence controller being arranged in clipping control module, is working
In the process, whether there is slicing mistake first with the second output signal exported in distortion detector real-time detection public address module
Very, once the second sequence controller of clipping distortion occur starts time reduction second signal gain according to preset slicing immediately
The yield value of (gain in public address module) increases to further decrease second signal on the basis of the first signal gain reduces
Benefit (reduction speed for accelerating system signal gain), eliminates the clipping distortion.After clipping distortion is eliminated, the second timing control
Device slowly by signals revivification and controls in clipping amplitude according to preset release time immediately, simple and convenient, and can quickly reach
To the purpose of the present invention.
Detailed description of the invention
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, to above-mentioned characteristic, technical characteristic,
Advantage and its implementation are further described.
Fig. 1 is input signal and output signal relational graph in existing compression limiter；
Fig. 2 is input signal and output signal relational graph when existing compression limiter dynamic range is smaller；
Fig. 3 is output signal in existing compression limiter with input signal variation diagram and system gain figure；
Fig. 4 is the structural schematic diagram that the first embodiment of limiter is compressed in the present invention；
Fig. 5 is the structural schematic diagram that second of embodiment of limiter is compressed in the present invention；
Fig. 6 is the relational graph in the present invention between the first signal gain, second signal gain and system signal gain；
Fig. 7 is the structural schematic diagram that the third embodiment of limiter is compressed in the present invention；
Fig. 8 is the relational graph in the present invention between the first output signal and reference voltage.
Drawing reference numeral explanation:
The A- starting time, B- release time, the C- slicing starting time, D- slicing release time, Vref- reference voltage,
The amplitude of the first output signal of Vo1-；
100- compression limiter, 110- gain regulation module, 120- public address module, 130- clipping control module, 131- are cut
Wave detector, the second sequence controller of 132-, 133- gain controller, 111- variable gain amplifier, 112- compression control are put
Big device, 113- comparator, the first sequence controller of 114-.
Specific embodiment
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, Detailed description of the invention will be compareed below
A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, and obtain other embodiments.
It is illustrated in figure 4 the first embodiment structure schematic diagram of compression limiter 100 provided by the invention, it can from figure
It include: gain regulation module 110, public address module 120 and clipping control module in the compression limiter 100 to find out
130, wherein public address module 120 is connect with gain regulation module 110, and clipping control module 130 is connect with public address module 120.?
In the course of work, gain regulation module 110 is amplified using the input signal that the first signal gain inputs system defeated first
First output signal out, and judge the amplitude of first output signal and the pass of compression threshold threshold value V1/ clipping threshold threshold value V2
System.If the amplitude of the first output signal has exceeded compression threshold threshold value V1/ clipping threshold threshold value V2, gain regulation module 110
It can be used to carry out input signal the first signal gain of compression clipping according to first output signal, feedback regulation.Amplify mould
Block 120 (i.e. public address equipment) carries out power amplification output the second output letter after receiving the first output signal to it immediately
Number, and the loudspeaker connecting with public address module 120 is driven to export second output signal.Illustrate be, by public address module 120
Effect be to the first output signal carry out power amplification, and theoretically for by the amplitude of the second output signal in clipping amplitude
It is interior, therefore exist between clipping threshold threshold value and clipping amplitude here and compare relationship surely；I.e. if the not gain to public address module 120
If (second signal gain) is adjusted, the relationship of the first output signal and the second output signal are as follows: the second output signal with
The waveform of first output signal is unanimously that amplitude changes.And since gain regulation module 110 and public address module 120 are strings
Connection relationship, therefore actually entirely the system signal gain of compression limiter 100 is the first signal gain and second signal gain
Product.
The above description is that the workflows for compressing limiter 100 under normal circumstances, if due to various reasons (including starting
Time A is too long, causes the dynamic range of public address equipment that can reduce due to various reasons etc.), it is exported in the second output signal
Clipping distortion, at this time clipping control module 130 is according to the second output signal of output to second signal gain (public address module
120 gain) carry out feedback regulation.At this point, the first signal gain is (when the amplitude of the first output signal is greater than clipping threshold threshold
Value, then gain regulation module 110 start reduce the first signal gain) and second signal gain (when the second output signal is cut
Wave distortion, clipping control module 130 reduce second signal gain) collective effect reduce input signal amplitude, clipping will be compressed
The amplitude control for the second output signal that device 100 exports is exported in clipping amplitude, and then elimination clipping is distorted.
In this embodiment, due to common work that the second output signal is in the first signal gain and second signal gain
Regulation is carried out with to input signal to which elimination clipping is distorted.In simple terms, when not occurring slicing mistake in the second output signal
Very, clipper-limiter can be according to the amplitude and compression threshold threshold value V1/ clipping threshold threshold value of the first output signal of output at this time
The relationship of V2 is finally controlled in clipping threshold threshold value V2 to be adjusted to the first signal gain, without believing second
Number gain is regulated and controled, and certainly, the system signal gain of compression limiter 100 remains as the first signal gain and second signal increases
The product of benefit.When occurring clipping distortion in the second output signal, then at this time clipping control device 130 can to second signal gain into
Row adjustment, that is, reduce the yield value of second signal gain, realizes the purpose of elimination clipping distortion.Thus, it is opened from clipping distortion
Begin during occurring to clipping distortion eliminating, clipping control module 130 will necessarily rapidly reduce the increasing of second signal gain
Benefit value, has exceeded the size of slicing amplitude and disappearing for setting as fall off rate and the second output signal of second signal gain
It is different because of situation difference except the time (slicing starts time C) of the clipping distortion is related.
The first embodiment is improved, second of embodiment is obtained, as shown in figure 5, in the present embodiment,
It include distortion detector 131, the second sequence controller 132 and gain controller 133 in clipping control module 130, wherein cut
Wave detector 131 is connect with public address module 120, the second sequence controller 132 respectively with distortion detector 131 and gain controller
133 connections, gain controller 133 are connect with public address module 120.During the work time, distortion detector 131 can be persistently to amplifying
The second output signal that module 120 exports is monitored, and sees whether clipping distortion occur.If distortion detector 131 detects
There is clipping distortion in two output signals, then send clipping distortion signal to the second sequence controller 132.Second sequence controller
132 receive the clipping distortion signal, adjust second signal gain according to the second output signal immediately and (reduce second signal gain
Yield value), and second signal gain adjusted is sent to gain controller 133.Then, if distortion detector 131 is examined
It measures clipping distortion in the second output signal to eliminate, then sends clipping distortion and eliminate signal to the second sequence controller 132；The
After two sequence controllers 132 receive clipping distortion elimination signal, second signal gain can equally be adjusted and (be increased
The yield value of second signal gain), and second signal gain adjusted is sent to gain controller 133.Finally, gain control
Device 133 processed carries out gain control according to the second signal gain adjusted received, to the first output signal.
In a specific embodiment, as shown in fig. 6, the second sequence controller 132 is adjusted second signal gain
Process it is as follows:
When clipping distortion occurs in the second output signal, the second sequence controller 132 starts time C according to preset slicing
(there is time for eliminating to clipping distortion in clipping distortion, i.e., by the amplitude control of the second output signal in slicing amplitude when
Between), reduce the yield value of second signal gain.In actual operation, it is intended that the clipping distortion of appearance can be as fast as possible
Elimination, therefore herein, preset slicing starting time C would generally be shorter, only several milliseconds of even delicate grades.Then when
When two sequence controllers 132 receive clipping distortion signal, time C can be started according to the preset slicing, be reduced rapidly second
The yield value of signal gain.In addition, from the figure we can see that, when there is clipping distortion in the second output signal, at this time
The meeting synchronous feedback of gain regulation module 110 adjusts the yield value of the first signal gain, is opening with second signal gain collective effect
In dynamic time A by the control of the second output signal in clipping amplitude.It will be understood that as shown, slicing starting time C is remote
Less than starting time A, (it is logical to start time A beyond clipping amplitude to the time controlled in clipping amplitude for the first output signal
It is often several milliseconds to a few tens of milliseconds).
When the second output signal clipping distortion is eliminated, then the second sequence controller 132 can be discharged according to preset slicing
Between D (amplitude of the second output signal is controlled into time in clipping amplitude from slicing amplitude) increase the increasing of second signal gain
Benefit value is until clipping yield value.It can be seen from the figure that the yield value of the first signal gain is constantly between on startup in A
Reduced state, and the yield value of second signal gain can first reduce (slicing starts in time C) and be further added by (slicing release time
In D), the yield value being eventually held in after slicing release time D is constant, until occurring the case where clipping distortion next time,
Clipping control module 130 again adjusts second signal gain, is recycled with this.
In another specific embodiment, in slicing starting time C, the yield value reduction speed of second signal gain is big
In the yield value reduction speed of the first signal gain.Based on foregoing description it is known that compression limiter 100 increases in the first signal
Elimination clipping is distorted and controls the second output signal and carries out in clipping amplitude under benefit and the collective effect of second signal gain
Output.In some special cases, if the second output signal is many beyond slicing amplitude, the reduction of second signal gain at this time
Rate wants bigger could start in time C in slicing to eliminate the clipping distortion certainly.
Second of embodiment is improved to obtain the third embodiment, as shown in fig. 7, in the present embodiment,
It include a variable gain amplifier 111, compression control amplifier 112, comparator 113 and first in gain regulation module 110
Sequence controller 114, wherein variable gain amplifier 111 respectively with public address module 120, compression control amplifier 112 and compared with
Device 113 connects, and comparator 113 is connect with variable gain amplifier 111 and compression control amplifier 112 respectively, the first timing control
Device 114 processed is connect with variable gain amplifier 111 and comparator 113 respectively.During the work time, variable gain amplifier first
111 amplify input signal according to the system signal gain of the first sequence controller 114 output, output the first output letter
Number；After compression control amplifier 112 receives first output signal, reference voltage Vref is adjusted immediately；Then,
The amplitude of first output signal and reference voltage Vref are compared；Finally, the first sequence controller 114 is according to comparator
113 comparison result adjusts the first signal gain, and the first signal gain adjusted is inputted variable gain amplifier 111
In.
Specifically, in compression control amplifier 112, as shown in Figure 8: when the amplitude of the first output signal is less than compression
When threshold threshold value V1, compression control amplifier 112 draws high reference voltage Vref, and reference voltage Vref does not work at this time,
Compress limiter 100 during this input signal is amplified and exported, i.e., output signal (including the first output signal and
Second output signal) it is linear with input signal；When the amplitude of the first output signal is in compression threshold threshold value V1 and clipping
When between threshold threshold value V2, compression control amplifier according to preset compression ratio generate reference voltage Vref, to voice signal into
Row compression；When the amplitude of the first output signal is greater than clipping threshold threshold value V2, compression control amplifier is permanent by reference voltage Vref
Fixed control corresponding voltage value when compressing 100 output violent change of limiter (amplitude of the second output signal is in clipping amplitude),
Clipping is carried out to input signal.
Compression control amplifier 112 is after adjusting reference voltage Vref, and comparator 113 is with i.e. by the first output
The amplitude of signal is compared with reference voltage Vref.Specifically, when the amplitude of the first output signal is greater than compression control amplifier
When the reference voltage Vref of 112 outputs, it is transmitted into starting time A and instructs to the first sequence controller 114；When the first output letter
Number amplitude be less than compression control amplifier 112 export reference voltage Vref when, be transmitted into release time B and instruct to first
Sequence controller 114.
Then, in the first sequence controller 114: when the first sequence controller 114 is received into starting time A instruction
When, the first sequence controller 114 reduces the yield value of the first signal gain according to preset starting time A, by the second output
Signal controls in clipping amplitude；When the first sequence controller 114, which is received, to be instructed into release time B, the first timing control
Device 114 processed increases the yield value of the first signal gain according to preset release time B (generally in several hundred milliseconds by several seconds), the
One signal gain is as shown in Figure 6 with the variation of input signal.
Based on above description, in the present invention, gain regulation module 110 is according to the first output signal from output to first
Signal gain carries out feedback regulation, and clipping control module 130 increases according to the second output signal for clipping distortion occur to second
Beneficial signal carries out feedback regulation, to eliminate the second output under the first signal gain and the collective effect of second signal gain
Due to starting overlong time or since output loading becomes, weight, supply voltage is lower, temperature is got higher etc., and application conditions become in signal
120 reduced dynamic range of public address module caused by when change and the clipping distortion occurred improve the output sound quality of public address module 120,
Promote user experience.
It should be noted that above-described embodiment can be freely combined as needed.The above is only of the invention preferred
Embodiment, it is noted that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (6)
1. a kind of compression limiter, which is characterized in that include: in the compression limiter gain regulation module, public address module with
And clipping control module, wherein
The gain regulation module exports the first output signal according to the input signal of the compression limiter；And according to described
The first signal gain of clipping is compressed in first output signal, feedback regulation for realizing the input signal；
The public address module is connect with the gain regulation module, and the public address module exports the gain regulation module
First output signal carries out power amplification, exports the second output signal；
The clipping control module, connect with the public address module, and the clipping control module is exported according to the public address module
The second output signal in the clipping distortion that occurs, feedback regulation amplify for realizing first output signal power second
Signal gain；
The compression limiter is under first signal gain and the collective effect of the second signal gain by the compression
The second output signal control of limiter output is exported in clipping amplitude；
It include: distortion detector, the second sequence controller and gain controller in the clipping control module, wherein
The distortion detector is connect with the public address module, and the distortion detector is for detecting the public address module output
The second output signal in whether there is clipping distortion；
Second sequence controller, connect with the distortion detector and the gain controller respectively, when the slicing is examined
It surveys device and detects that clipping distortion occurs in second output signal, second sequence controller is according to second output signal
The second signal gain is adjusted, and second signal gain adjusted is sent to the gain controller；
The gain controller is connect with second sequence controller and the public address module, the gain controller respectively
According to the second signal gain that second sequence controller exports, gain control is carried out to first output signal；
In second sequence controller:
When clipping distortion occurs in second output signal, second sequence controller starts the time according to preset slicing,
Reduce the yield value of the second signal gain；Slicing start the time be the second output signal amplitude from clipping distortion occur to
The time that clipping distortion is eliminated；
When the second output signal clipping distortion is eliminated, second sequence controller according to preset slicing release time,
Increase the yield value of the second signal gain；Slicing release time is to control the amplitude of the second output signal from slicing amplitude
Time in clipping amplitude；
When clipping distortion occurs in second output signal, second sequence controller starts the time according to preset slicing,
Reduce the yield value of the second signal gain；And within the slicing starting time, the yield value of the second signal gain
Reduction speed is greater than the yield value reduction speed of first signal gain.
2. compression limiter as described in claim 1, it is characterised in that: include a variable gain in the gain regulation module
Amplifier, compression control amplifier, comparator and the first sequence controller, wherein
The variable gain amplifier is connect with first sequence controller, according to first sequence controller output
First signal gain amplifies input signal, exports the first output signal；
The compression control amplifier, connect with the variable gain amplifier, is adjusted and is referred to according to first output signal
Voltage；
The comparator is connect with the variable gain amplifier and the compression control amplifier respectively, and the comparator will
The amplitude of first output signal and the reference voltage are compared；
First sequence controller, connect with the variable gain amplifier and the comparator respectively, first timing
Controller adjusts the first signal gain according to the comparison result of the comparator, and the first signal gain adjusted is inputted institute
State variable gain amplifier.
3. compression limiter as claimed in claim 2, which is characterized in that
In the compression control amplifier:
When the amplitude of first output signal is less than compression threshold threshold value, the compression control amplifier is by described with reference to electricity
Pressure is drawn high；
When the amplitude of first output signal is between compression threshold threshold value and clipping threshold threshold value, the compression control is put
Big device generates reference voltage according to preset compression ratio；
When the amplitude of first output signal is greater than clipping threshold threshold value, the compression control amplifier is by the reference voltage
Constant control corresponding voltage value in the compression limiter output violent change.
4. compression limiter as claimed in claim 3, which is characterized in that in the comparator:
When the amplitude of first output signal is greater than the reference voltage of compression control amplifier output, when being transmitted into starting
Between instruction to first sequence controller；
When the amplitude of first output signal is less than the reference voltage of compression control amplifier output, when being transmitted into release
Between instruction to first sequence controller.
5. compression limiter as claimed in claim 4, which is characterized in that in first sequence controller:
When first sequence controller receives the time command into starting, first sequence controller is according to pre-
If the starting time, reduce the yield value of first signal gain；
When first sequence controller receives the instruction into release time, first sequence controller is according to pre-
If release time, increase the yield value of first signal gain.
6. compression limiter as claimed in claim 5, which is characterized in that when the starting time is greater than slicing starting
Between.
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| CN201510862328.9A CN105281695B (en) | 2015-11-30 | 2015-11-30 | A kind of compression limiter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192862A (en) * | 2006-11-30 | 2008-06-04 | 昂达博思公司 | Method and device for automatic gain control in wireless communication system |
| CN101262208A (en) * | 2007-03-09 | 2008-09-10 | 松下电器产业株式会社 | Automatic gain control circuit |
| CN102740212A (en) * | 2011-04-13 | 2012-10-17 | 奥迪康有限公司 | Hearing device with automatic clipping prevention and corresponding method |
| CN205212794U (en) * | 2015-11-30 | 2016-05-04 | 上海若瓦鑫电子技术有限公司 | Compression clipper -limiter |
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| EP2738938B1 (en) * | 2012-11-29 | 2020-06-17 | Goodix Technology (HK) Company Limited | Audio system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192862A (en) * | 2006-11-30 | 2008-06-04 | 昂达博思公司 | Method and device for automatic gain control in wireless communication system |
| CN101262208A (en) * | 2007-03-09 | 2008-09-10 | 松下电器产业株式会社 | Automatic gain control circuit |
| CN102740212A (en) * | 2011-04-13 | 2012-10-17 | 奥迪康有限公司 | Hearing device with automatic clipping prevention and corresponding method |
| CN205212794U (en) * | 2015-11-30 | 2016-05-04 | 上海若瓦鑫电子技术有限公司 | Compression clipper -limiter |
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