CN101692601B - Automatic gain control device and audio control system comprising same - Google Patents
Automatic gain control device and audio control system comprising same Download PDFInfo
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- CN101692601B CN101692601B CN200910085867.0A CN200910085867A CN101692601B CN 101692601 B CN101692601 B CN 101692601B CN 200910085867 A CN200910085867 A CN 200910085867A CN 101692601 B CN101692601 B CN 101692601B
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Abstract
The invention discloses an automatic gain control device and an audio control system comprising the same. The automatic gain control device comprises an extraction unit, a first addition unit, a moving average filter, a locking circuit and an accumulator, wherein the extraction unit is used for carrying out power extraction on intermediate frequency signals, and acquiring a signal instantaneous power value; the first addition unit is used for subtracting the signal instantaneous power value from a target power value, and acquiring a signal instantaneous power difference value; the moving average filter is used for acquiring an average power difference value according to the signal instantaneous power difference value; the locking circuit is used for generating locking signals according to the average power difference value, and the locking signals are used for controlling the accumulator to be in a locking or unlocking state; and the accumulator is used for accumulating the average power difference value in the unlocking state, and outputting automatic gain control signals. The fidelity of steady signals is improved by additionally arranging the locking circuit to control the operation of the accumulator.
Description
Technical field
The present invention relates generally to control field, the audio control system that refers in particular to a kind of automatic gain control equipment and comprise this device.
Background technology
Simulated television sound accompaniment or other audio signal are easily subject to noise jamming, thereby produce the fluctuations of sound size, therefore need very strong AGC (Automatic Gain Control, automatic gain is controlled) device to guarantee the steady and big or small constant of sound, thereby reduce distortion.
With reference to Fig. 1, it is the typical structured flowchart that adopts the wireless intermediate-frequency receiver of analog AGC means.Comprise low noise amplifier, down-conversion, filter and adjustable amplifier, RF (the RadioFrequency of antenna reception, radio frequency) through described low noise amplifier, after the processing of down-conversion and filter, enter described adjustable amplifier, described intermediate-frequency receiver also comprises power detector, the input of described power detector is connected with described input RF, the output of described power detector connects described adjustable amplifier, for controlling the gain of described adjustable amplifier, described power detector is by detecting the power level of described input RF, produce AGC controlling value, control the gain of the front described adjustable amplifier of intermediate frequency demodulation, thereby reach intermediate-freuqncy signal (SIF, sound intermediate frequency) object that automatic gain is controlled.Because whole system is realized by analog circuit, have that discreteness is larger, control precision is not high, the shortcoming such as poor heat stability, noise are large.
With reference to Fig. 2, it is the structured flowchart of the receiver of available technology adopting digital AGC device.AGC separates from analog circuit, becomes totally digital circuit, by analyzing the digital signal obtaining after the conversion of A/D conversion equipment, and generating digital automatic gaining controling signal, then be transferred to artificial circuit part.Analog circuit increases a D/A conversion equipment, converts digital Auto Gain control signal to analog control signal, then to the adjustable amplifier control that gain, thereby reaches the object of automatic gain control.Adopt digital AGC device not only to simplify the design of analog circuit, and there is very high stability and reliability, realize also simple than analog circuit, thereby be widely used in current receiver.
With reference to Fig. 3, it is the concrete composition structure chart of digital AGC device in Fig. 2.Intermediate-freuqncy signal SIF converts digital signal to through A/D conversion equipment, after power estimation unit is carried out power estimation, gets difference with reference value, then regulates step-length by a multiplication factor K, then, by the accumulator difference that add up, exports AGC control signal.
Inventor finds in realizing process of the present invention, at least there is following defect in existing technical scheme: described accumulator can constantly add up, no matter whether input signal needs adjusting range, capital is subject to the impact of AGC output, thereby to system, bring noise, reduced the fidelity of stabilization signal.
Summary of the invention
The audio control system that the present invention proposes a kind of automatic gain control equipment and comprises this device, controls the work of accumulator, the fidelity of having improved stabilization signal by increasing lock-in circuit.
Technical scheme of the present invention is achieved in that
An automatic gain control equipment, comprises extraction unit, the first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit, for intermediate-freuqncy signal is carried out to power draw, obtains signal transient performance number;
Described the first adder unit, for described signal transient performance number and target power value are subtracted each other, obtains signal instantaneous power difference value;
Described moving average filter, for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator in locking or unties state;
Described accumulator, for cumulative mean power difference when untiing state, output automatic gaining controling signal.
Preferably, described lock-in circuit comprises:
The first judging unit, for judging whether described average power difference value is less than first threshold d1;
The second judging unit, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1;
Generation unit, for when described the first judging unit judges that described average power difference value is less than described first threshold d1, generates the first locking signal of the described accumulator of locking, controls described accumulator not cumulative; When described the second judging unit judges that described average power difference value is greater than described Second Threshold d2, generate the second locking signal of untiing described accumulator, control described accumulator and add up.
Preferably, also comprise:
Removing DC road, for the intermediate-freuqncy signal of input is carried out to in-line filtration, removes the DC component in described intermediate-freuqncy signal.
Preferably, described removing DC road comprises:
Low pass filter, for extracting the DC component of the intermediate-freuqncy signal of described input;
The second adder unit, for the intermediate-freuqncy signal of described input being deducted to the DC component of described low pass filter output, the intermediate-freuqncy signal of DC component is removed in output.
Preferably, also comprise:
The first input unit, for inputting target power value.
Preferably, also comprise:
The second input unit, for inputting first threshold d1 and Second Threshold d2.
An audio control system, comprises adjustable amplifier, demodulating equipment, also comprises automatic gain control equipment, and described automatic gain control equipment comprises extraction unit, the first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit, for intermediate-freuqncy signal is carried out to power draw, obtains signal transient performance number;
Described the first adder unit, for described signal transient performance number and target power value are subtracted each other, obtains signal instantaneous power difference value;
Described moving average filter, for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator in locking or unties state;
Described accumulator, for cumulative mean power difference when untiing state, exports automatic gaining controling signal, controls the multiplication factor of described adjustable amplifier.
Preferably, described lock-in circuit comprises:
The first judging unit, for judging whether described average power difference value is less than first threshold d1;
The second judging unit, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1;
Generation unit, for when described the first judging unit judges that described average power difference value is less than described first threshold d1, generates the first locking signal of the described accumulator of locking, controls described accumulator not cumulative; When described the second judging unit judges that described average power difference value is greater than described Second Threshold d2, the second locking signal of described accumulator is untied in generation, controlling described accumulator adds up, thereby increase or reduce the output of described automatic gain control equipment, and then remove to regulate the multiple of described adjustable amplifier.
Preferably, described automatic gain control equipment also comprises:
Removing DC road, for the intermediate-freuqncy signal of input is carried out to in-line filtration, removes the DC component in described intermediate-freuqncy signal.
Preferably, described removing DC road comprises:
Low pass filter, for extracting the DC component of the intermediate-freuqncy signal of described input;
The second adder unit, for the intermediate-freuqncy signal of described input being deducted to the DC component of described low pass filter output, the intermediate-freuqncy signal of DC component is removed in output.
Preferably, described automatic gain control equipment also comprises:
The first input unit, for inputting target power value.
Preferably, described automatic gain control equipment also comprises:
The second input unit, for inputting first threshold d1 and Second Threshold d2.
The present invention controls accumulator in locking or unties state by increasing lock-in circuit, when input signal is stabilization signal, accumulator is in the lock state and can not adds up, can not change signal gain, thereby keep the constant of multiplication factor, can stabilization signal not produced and be disturbed, reduce distorted signals, improve the fidelity of stabilization signal; When input signal generation acute variation fluctuation is larger, automatic gain control equipment can be jumped out from lock-out state, again, to the signal control that gains, signal is returned to suitable level.
Further, by increasing removing DC road, remove the DC component in intermediate-freuqncy signal, increased the antijamming capability of automatic gain control equipment and audio control system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the typical structured flowchart that adopts the wireless intermediate-frequency receiver of analog AGC means;
Fig. 2 is the structured flowchart of the receiver of available technology adopting digital AGC device;
Fig. 3 is the concrete composition structure chart of digital AGC device in Fig. 2;
Fig. 4 is the composition structure chart of a kind of automatic gain control equipment the first embodiment of the present invention;
Fig. 5 is the composition structure chart of lock-in circuit 440 described in Fig. 4;
Fig. 6 is the composition structure chart of a kind of automatic gain control equipment the second embodiment of the present invention;
Fig. 7 is the composition structure chart of a kind of audio control system the first embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
With reference to Fig. 4, show the composition structure chart of a kind of automatic gain control equipment the first embodiment of the present invention.Described automatic gain control equipment 400 comprises extraction unit 410, the first adder unit 420, moving average filter 430, lock-in circuit 440, accumulator 450.
Described extraction unit 410, for intermediate-freuqncy signal is carried out to power draw, obtain signal transient performance number.
Described extraction unit 410, by intermediate-freuqncy signal is taken absolute value, carries out power draw to intermediate-freuqncy signal, obtains signal transient performance number.
Described the first adder unit 420, for described signal transient performance number and target power value are subtracted each other, obtain signal instantaneous power difference value.
Described target power value can be according to the actual requirements by the first input unit 460 inputs.
Moving average filter 430, for obtaining average power difference value according to described signal instantaneous power difference value.
Described moving average filter 430 is obtained the average power difference value of (as 5S, 10S......) in a period of time according to described signal instantaneous power difference value.
Described lock-in circuit 440, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator 450 in locking or unties state.
Described accumulator 450, for cumulative mean power difference when untiing state, output automatic gaining controling signal.
With reference to Fig. 5, show the composition structure chart of lock-in circuit described in Fig. 4 440.Described lock-in circuit 440 comprises the first judging unit 510, the second judging unit 520 and generation unit 530.
Described the first judging unit 510, for judging whether described average power difference value is less than first threshold d1.
Described the second judging unit 520, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1 (d2 > d1).
Described first threshold d1 and Second Threshold d2 can be according to the actual requirements by the second input unit 540 inputs.
By increasing lock-in circuit 440, control accumulator 450 in locking or untie state, when described average power difference value is less than described first threshold d1, generate the first locking signal of the described accumulator 450 of locking, accumulator 450 does not add up, and 400 pairs of signal gains of automatic gain control equipment remain unchanged; When described average power difference value is greater than described Second Threshold d2, the second locking signal of described accumulator 450 is untied in generation, control described accumulator 450 and add up, thereby increase or reduce the output of described automatic gain control equipment 400, and then remove to regulate the multiple of described adjustable amplifier.Therefore,, when input signal is stabilization signal, accumulator 450 is in the lock state and can not adds up, can not change signal gain, thereby keep the constant of multiplication factor, can stabilization signal not produced and be disturbed, reduce distorted signals, improved the fidelity of stabilization signal; When input signal generation acute variation fluctuation is larger, automatic gain control equipment 400 can be jumped out from lock-out state, again, to the signal control that gains, signal is returned to suitable level.
With reference to Fig. 6, show the composition structure chart of a kind of automatic gain control equipment the second embodiment of the present invention.Described automatic gain control equipment 400 comprises removing DC road 610, extraction unit 410, the first adder unit 420, moving average filter 430, lock-in circuit 440, accumulator 450.
The difference of the present embodiment and the first embodiment is to have increased removing DC road 610, and this is because if the intermediate-freuqncy signal SIF of input contains DC component, DC component can cause very large impact to signal power, the ability of even losing the job.By increasing removing DC road 610, removed the DC component in intermediate-freuqncy signal, increased the antijamming capability of automatic gain control equipment 400 and audio control system.
Described removing DC road 610, for to input intermediate-freuqncy signal carry out in-line filtration, remove the DC component in described intermediate-freuqncy signal.
Described removing DC road 610 comprises low pass filter 612 and the second adder unit 611.
Described low pass filter 612, for extracting the DC component of the intermediate-freuqncy signal of described input.
Described the second adder unit 611, the DC component of exporting for the intermediate-freuqncy signal of described input being deducted to described low pass filter 612, the intermediate-freuqncy signal of DC component is removed in output.
Described extraction unit 410, for to going the intermediate-freuqncy signal after DC component to carry out power draw, obtain signal transient performance number.
Described extraction unit 410, by intermediate-freuqncy signal is taken absolute value, carries out power draw to intermediate-freuqncy signal, obtains signal transient performance number.
Described the first adder unit 420, for described signal transient performance number and target power value are subtracted each other, obtain signal instantaneous power difference value.
Described target power value can be inputted by the first input unit according to the actual requirements.
Moving average filter 430, for obtaining average power difference value according to described signal instantaneous power difference value.
Described moving average filter 430 is obtained the average power difference value of (as 5S, 10S......) in a period of time according to described signal instantaneous power difference value.
Described lock-in circuit 440, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator 450 in locking or unties state.
Described lock-in circuit 440 comprises the first judging unit 510, the second judging unit 520 and generation unit 530.
Described the first judging unit 510, for judging whether described average power difference value is less than first threshold d1.
Described the second judging unit 520, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1 (d2 > d1).
Described first threshold d1 and Second Threshold d2 can be according to the actual requirements by the second input unit 540 inputs.
Described accumulator 450, for cumulative mean power difference when untiing state, output automatic gaining controling signal.
Below the course of work of automatic gain control equipment described in the embodiment of the present invention 400 and operation principle are described:
If average power difference value is less than first threshold d1, it is 1 that lock-in circuit 440 produces the first locking signal, and the input that makes accumulator 450 is 0, thereby keeps accumulator 450 constant, and the output of automatic gain control equipment 400 is constant, signal is not exerted an influence; If average power difference value is greater than Second Threshold d2, lock-in circuit 440 generation the second locking signals are 0, the continuous cumulative mean power difference of accumulator 450, thereby the output of increase or less automatic gain control equipment 400, and then the multiplication factor of removing resonance-amplifier, signal gain is controlled automatically.When input signal average amplitude (power) is greater than target power, described moving average filter 430 is output as negative value, the value of accumulator 450 is reduced, thereby the output of automatic gain control equipment 400 diminishes, and then multiplication factor that can control amplifier reduces, input range is diminished; Otherwise the value of moving average filter 430 is for just, the value of accumulator 450 increases, it is large that the output of automatic gain control equipment 400 becomes, and then the increase of the multiplication factor of amplifier, input range is increased, thereby reach automatic adjusting input range to the effect of desired value.
When input signal amplitude and desired value differ while being less than first threshold d1, be in the lock state, at this moment as long as the fluctuation of input signal amplitude is no more than Second Threshold d2 (d2 > d1), the accumulator 450 of automatic gain control equipment 400 is just not cumulative, thereby keep multiplication factor constant, play the effect of stabilization signal.Only have the fluctuation of input signal amplitude larger, automatic gain control equipment 400 just can go to regulate again.Like this, when input intermediate-freuqncy signal SIF is more stable signal, automatic gain control equipment 400 can not change signal gain, can stabilization signal not produced and be disturbed, and reduce distorted signals.While affecting the quality of reception when signal generation acute variation, automatic gain control equipment 400 will be jumped out from lock-out state, again to the signal control that gains, signal is returned to suitable level.
The invention also discloses a kind of audio control system, with reference to Fig. 7, is the composition structure chart of a kind of audio control system the first embodiment of the present invention.Described audio control system 700 comprises adjustable amplifier 710, demodulating equipment 720 and automatic gain control equipment 400.Described automatic gain control equipment 400 have been described in detail in each embodiment described in Fig. 4, Fig. 5, Fig. 6, described adjustable amplifier 710 and demodulating equipment 720 are prior art, for length is considered, do not repeat them here, description with reference to related art, described audio control system can also comprise other part, and as A/D conversion equipment, D/A conversion equipment, the present invention does not limit this.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an automatic gain control equipment, is characterized in that, comprises extraction unit, the first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit, for intermediate-freuqncy signal is carried out to power draw, obtains signal transient performance number;
Described the first adder unit, for described signal transient performance number and target power value are subtracted each other, obtains signal instantaneous power difference value;
Described moving average filter, for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator in locking or unties state;
Described accumulator, for cumulative mean power difference when untiing state, output automatic gaining controling signal;
Described lock-in circuit comprises:
The first judging unit, for judging whether described average power difference value is less than first threshold d1;
The second judging unit, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1;
Generation unit, for when described the first judging unit judges that described average power difference value is less than described first threshold d1, generates the first locking signal of the described accumulator of locking, controls described accumulator not cumulative; When described the second judging unit judges that described average power difference value is greater than described Second Threshold d2, generate the second locking signal of untiing described accumulator, control described accumulator and add up.
2. automatic gain control equipment according to claim 1, is characterized in that, also comprises:
Removing DC road, for the intermediate-freuqncy signal of input is carried out to in-line filtration, removes the DC component in described intermediate-freuqncy signal.
3. automatic gain control equipment according to claim 2, is characterized in that, described removing DC road comprises:
Low pass filter, for extracting the DC component of the intermediate-freuqncy signal of described input;
The second adder unit, for the intermediate-freuqncy signal of described input being deducted to the DC component of described low pass filter output, the intermediate-freuqncy signal of DC component is removed in output.
4. automatic gain control equipment according to claim 3, is characterized in that, also comprises:
The first input unit, for inputting target power value.
5. automatic gain control equipment according to claim 4, is characterized in that, also comprises:
The second input unit, for inputting first threshold d1 and Second Threshold d2.
6. an audio control system, comprise adjustable amplifier, demodulating equipment, it is characterized in that, also comprise automatic gain control equipment, described automatic gain control equipment comprises extraction unit, the first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit, for intermediate-freuqncy signal is carried out to power draw, obtains signal transient performance number;
Described the first adder unit, for described signal transient performance number and target power value are subtracted each other, obtains signal instantaneous power difference value;
Described moving average filter, for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit, for producing locking signal according to described average power difference value, described locking signal is used for controlling described accumulator in locking or unties state;
Described accumulator, for cumulative mean power difference when untiing state, exports automatic gaining controling signal, controls the multiplication factor of described adjustable amplifier;
Described lock-in circuit comprises:
The first judging unit, for judging whether described average power difference value is less than first threshold d1;
The second judging unit, for judging whether described average power difference value is greater than Second Threshold d2, described Second Threshold d2 is greater than described first threshold d1;
Generation unit, for when described the first judging unit judges that described average power difference value is less than described first threshold d1, generates the first locking signal of the described accumulator of locking, controls described accumulator not cumulative; When described the second judging unit judges that described average power difference value is greater than described Second Threshold d2, the second locking signal of described accumulator is untied in generation, controlling described accumulator adds up, thereby increase or reduce the output of described automatic gain control equipment, and then remove to regulate the multiple of described adjustable amplifier.
7. audio control system according to claim 6, is characterized in that, described automatic gain control equipment also comprises:
Removing DC road, for the intermediate-freuqncy signal of input is carried out to in-line filtration, removes the DC component in described intermediate-freuqncy signal.
8. audio control system according to claim 7, is characterized in that, described removing DC road comprises:
Low pass filter, for extracting the DC component of the intermediate-freuqncy signal of described input;
The second adder unit, for the intermediate-freuqncy signal of described input being deducted to the DC component of described low pass filter output, the intermediate-freuqncy signal of DC component is removed in output.
9. audio control system according to claim 8, is characterized in that, described automatic gain control equipment also comprises:
The first input unit, for inputting target power value.
10. audio control system according to claim 9, is characterized in that, described automatic gain control equipment also comprises:
The second input unit, for inputting first threshold d1 and Second Threshold d2.
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| CN102186234B (en) * | 2011-03-18 | 2013-10-09 | 上海华为技术有限公司 | Gain control circuit and method |
| CN106707867A (en) * | 2016-12-30 | 2017-05-24 | 脉创测控装备科技（苏州）有限公司 | Device and method for regulating and controlling audio signal based on D/A converter |
| CN106936387B (en) * | 2017-03-24 | 2020-02-14 | 合肥工业大学 | Correction module and method for sine and cosine measurement signals |
| CN109120292B (en) * | 2018-08-06 | 2019-11-05 | 电子科技大学 | A kind of digital automatic gain control system and method |
| CN109088611A (en) * | 2018-09-28 | 2018-12-25 | 咪付（广西）网络技术有限公司 | A kind of auto gain control method and device of acoustic communication system |
| CN110545116A (en) * | 2019-07-16 | 2019-12-06 | 广州润芯信息技术有限公司 | Receiver double-loop automatic gain control method, electronic equipment, medium and device |
| CN116192072B (en) * | 2023-04-25 | 2023-07-25 | 成都允高科技有限公司 | Digital audio AGC linear gain modulation method and system |
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| US6668027B1 (en) * | 1999-03-02 | 2003-12-23 | Hitachi America, Ltd. | Self adjusting automatic gain control (AGC) power reference level circuit |
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