CN101692601A - Automatic gain control device and audio control system comprising same - Google Patents
Automatic gain control device and audio control system comprising same Download PDFInfo
- Publication number
- CN101692601A CN101692601A CN200910085867A CN200910085867A CN101692601A CN 101692601 A CN101692601 A CN 101692601A CN 200910085867 A CN200910085867 A CN 200910085867A CN 200910085867 A CN200910085867 A CN 200910085867A CN 101692601 A CN101692601 A CN 101692601A
- Authority
- CN
- China
- Prior art keywords
- signal
- power difference
- difference value
- accumulator
- automatic gain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000605 extraction Methods 0.000 claims abstract description 17
- 230000001052 transient effect Effects 0.000 claims description 14
- 230000008676 import Effects 0.000 claims description 8
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 description 10
- 230000006641 stabilisation Effects 0.000 description 10
- 238000011105 stabilization Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000001154 acute effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Images
Landscapes
- Control Of Amplification And Gain Control (AREA)
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 the control field, refers in particular to a kind of automatic gain control equipment and comprises the audio control system of this device.
Background technology
Simulated television sound accompaniment or other audio signal are subjected to noise jamming easily, thereby produce the fluctuations of sound size, therefore need very strong AGC (Automatic Gain Control, automatic gain control) device to guarantee the steady and big or small constant of sound, thereby reduce distortion.
With reference to Fig. 1, be 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 that antenna receives, radio frequency) through described low noise amplifier, enter described adjustable amplifier after the processing of down-conversion and filter, 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, be used to control the gain of described adjustable amplifier, described power detector is by detecting the power level of described input RF, produce the AGC controlling value, the gain of described adjustable amplifier before the control intermediate frequency demodulation, thereby reach the purpose of intermediate-freuqncy signal (SIF, sound intermediate frequency) automatic gain control.Because whole system realizes by analog circuit, have that discreteness is bigger, control precision is not high, shortcoming such as poor heat stability, noise are big.
With reference to Fig. 2, be 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 that obtains after the conversion of A/D conversion equipment, generates the digital Auto Gain control signal, is transferred to artificial circuit part again.Analog circuit increases a D/A conversion equipment, converts the digital Auto Gain control signal to analog control signal, again adjustable amplifier is carried out gain controlling, thereby reaches the purpose of automatic gain control.Adopt digital AGC device not only to simplify Design of Simulating Circuits, and have very high stability and reliability, realize also simple than analog circuit, thereby be widely used in the present receiver.
With reference to Fig. 3, be the concrete composition structure chart of digital AGC device among Fig. 2.Intermediate-freuqncy signal SIF converts digital signal to through the A/D conversion equipment, carries out power through power estimation unit and estimates that back and reference value get difference, regulates step-length by a multiplication factor K again, then by the accumulator difference that adds up, output AGC control signal.
The inventor finds in realizing process of the present invention, there is following defective at least in existing technical scheme: described accumulator can constantly add up, no matter whether input signal needs adjusting range, the capital is subjected to the influence of AGC output, thereby bring noise to system, reduced the fidelity of stabilization signal.
Summary of the invention
The present invention proposes a kind of automatic gain control equipment and comprises the audio control system of this device, by increasing the work of lock-in circuit control accumulator, the fidelity of having improved stabilization signal.
Technical scheme of the present invention is achieved in that
A kind of automatic gain control equipment comprises extraction unit, first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit is used for intermediate-freuqncy signal is carried out power draw, obtains the signal transient performance number;
Described first adder unit is used for described signal transient performance number and target power value are subtracted each other, and obtains signal instantaneous power difference value;
Described moving average filter is used for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit is used for producing locking signal according to described average power difference value, and described locking signal is used to control described accumulator and is in locking or unties state;
Described accumulator is used for cumulative mean power difference when untiing state, the output automatic gaining controling signal.
Preferably, described lock-in circuit comprises:
First judging unit is used to judge that whether described average power difference value is less than first threshold d1;
Whether second judging unit is used to judge described average power difference value greater than the second threshold value d2, and the described second threshold value d2 is greater than described first threshold d1;
Generation unit is used for generating first locking signal of the described accumulator of locking when the described average power difference value of described first judgment unit judges during less than described first threshold d1, controls described accumulator and does not add up; When the described average power difference value of described second judgment unit judges during greater than the described second threshold value d2, generate second locking signal of untiing described accumulator, control described accumulator and add up.
Preferably, also comprise:
The removing DC road is used for the intermediate-freuqncy signal of input is carried out in-line filtration, removes the DC component in the described intermediate-freuqncy signal.
Preferably, described removing DC road comprises:
Low pass filter is used for extracting the DC component of the intermediate-freuqncy signal of described input;
Second adder unit is used for the intermediate-freuqncy signal of described input is deducted the DC component that described low pass filter is exported, and the intermediate-freuqncy signal of DC component is removed in output.
Preferably, also comprise:
First input unit is used to import target power value.
Preferably, also comprise:
Second input unit is used to import the first threshold d1 and the second threshold value d2.
A kind of audio control system comprises adjustable amplifier, demodulating equipment, also comprises automatic gain control equipment, and described automatic gain control equipment comprises extraction unit, first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit is used for intermediate-freuqncy signal is carried out power draw, obtains the signal transient performance number;
Described first adder unit is used for described signal transient performance number and target power value are subtracted each other, and obtains signal instantaneous power difference value;
Described moving average filter is used for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit is used for producing locking signal according to described average power difference value, and described locking signal is used to control described accumulator and is in locking or unties state;
Described accumulator is used 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:
First judging unit is used to judge that whether described average power difference value is less than first threshold d1;
Whether second judging unit is used to judge described average power difference value greater than the second threshold value d2, and the described second threshold value d2 is greater than described first threshold d1;
Generation unit is used for generating first locking signal of the described accumulator of locking when the described average power difference value of described first judgment unit judges during less than described first threshold d1, controls described accumulator and does not add up; When the described average power difference value of described second judgment unit judges during greater than the described second threshold value d2, 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:
The removing DC road is used for the intermediate-freuqncy signal of input is carried out in-line filtration, removes the DC component in the described intermediate-freuqncy signal.
Preferably, described removing DC road comprises:
Low pass filter is used for extracting the DC component of the intermediate-freuqncy signal of described input;
Second adder unit is used for the intermediate-freuqncy signal of described input is deducted the DC component that described low pass filter is exported, and the intermediate-freuqncy signal of DC component is removed in output.
Preferably, described automatic gain control equipment also comprises:
First input unit is used to import target power value.
Preferably, described automatic gain control equipment also comprises:
Second input unit is used to import the first threshold d1 and the second threshold value d2.
The present invention is in locking or unties state by increasing lock-in circuit control accumulator, 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 not produce and disturb, reduce distorted signals, improve the fidelity of stabilization signal stabilization signal; When the fluctuation of input signal generation acute variation was big, automatic gain control equipment can be jumped out from lock-out state, again signal is carried out gain controlling, and signal is returned to suitable level.
Further,, removed the DC component in the intermediate-freuqncy signal, increased the antijamming capability of automatic gain control equipment and audio control system by increasing the removing DC road.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
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 among Fig. 2;
Fig. 4 is the composition structure chart of a kind of automatic gain control equipment 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 second embodiment of the present invention;
Fig. 7 is the composition structure chart of a kind of audio control system first embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
With reference to Fig. 4, show the composition structure chart of a kind of automatic gain control equipment first embodiment of the present invention.Described automatic gain control equipment 400 comprises extraction unit 410, first adder unit 420, moving average filter 430, lock-in circuit 440, accumulator 450.
Described extraction unit 410, be used for intermediate-freuqncy signal is carried out power draw, obtain the signal transient performance number.
Described extraction unit 410 carries out power draw by intermediate-freuqncy signal is taken absolute value to intermediate-freuqncy signal, obtains the signal transient performance number.
Described first adder unit 420, be used 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 460 inputs of first input unit.
Moving average filter 430, be used 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, be used for producing locking signal according to described average power difference value, described locking signal is used to control described accumulator 450 and is in locking or unties state.
Described accumulator 450, be used for cumulative mean power difference when untiing state, the 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 first judging unit 510, second judging unit 520 and generation unit 530.
Described first judging unit 510, be used to judge that whether described average power difference value is less than first threshold d1.
Described second judging unit 520, whether be used to judge described average power difference value greater than the second threshold value d2, the described second threshold value d2 is greater than described first threshold d1 (d2＞d1).
The described first threshold d1 and the second threshold value d2 can be according to the actual requirements by 540 inputs of second input unit.
Be in locking or untie state by increasing lock-in circuit 440 control accumulators 450, when described average power difference value during less than described first threshold d1, generate 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 during greater than the described second threshold value d2, 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 was stabilization signal, accumulator 450 was in the lock state and can not adds up, can not change signal gain, thereby keep the constant of multiplication factor, can not produce and disturb stabilization signal, reduce distorted signals, improved the fidelity of stabilization signal; When the fluctuation of input signal generation acute variation was big, automatic gain control equipment 400 can be jumped out from lock-out state, again signal is carried out gain controlling, and signal is returned to suitable level.
With reference to Fig. 6, show the composition structure chart of a kind of automatic gain control equipment second embodiment of the present invention.Described automatic gain control equipment 400 comprises removing DC road 610, extraction unit 410, first adder unit 420, moving average filter 430, lock-in circuit 440, accumulator 450.
The difference of the present embodiment and 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, then DC component can cause very big influence to signal power, even the ability of losing the job.By increasing removing DC road 610, removed the DC component in the intermediate-freuqncy signal, increased the antijamming capability of automatic gain control equipment 400 and audio control system.
Described removing DC road 610, be used for to the input intermediate-freuqncy signal carry out in-line filtration, remove the DC component in the described intermediate-freuqncy signal.
Described removing DC road 610 comprises the low pass filter 612 and second adder unit 611.
Described low pass filter 612, be used for extracting the DC component of the intermediate-freuqncy signal of described input.
Described second adder unit 611, be used for the DC component that intermediate-freuqncy signal with described input deducts described low pass filter 612 outputs, the intermediate-freuqncy signal of DC component is removed in output.
Described extraction unit 410, be used for obtaining the signal transient performance number to going the intermediate-freuqncy signal after the DC component to carry out power draw.
Described extraction unit 410 carries out power draw by intermediate-freuqncy signal is taken absolute value to intermediate-freuqncy signal, obtains the signal transient performance number.
Described first adder unit 420, be used 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 input of first input unit.
Moving average filter 430, be used 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, be used for producing locking signal according to described average power difference value, described locking signal is used to control described accumulator 450 and is in locking or unties state.
Described lock-in circuit 440 comprises first judging unit 510, second judging unit 520 and generation unit 530.
Described first judging unit 510, be used to judge that whether described average power difference value is less than first threshold d1.
Described second judging unit 520, whether be used to judge described average power difference value greater than the second threshold value d2, the described second threshold value d2 is greater than described first threshold d1 (d2＞d1).
The described first threshold d1 and the second threshold value d2 can be according to the actual requirements by 540 inputs of second input unit.
Described accumulator 450, be used for cumulative mean power difference when untiing state, the output automatic gaining controling signal.
The course of work and operation principle to the described automatic gain control equipment 400 of the embodiment of the invention is described below:
If average power difference value is less than first threshold d1, it is 1 that lock-in circuit 440 produces first locking signal, makes that the input of 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 the second threshold value d2, then lock-in circuit 440 generations second locking signal is 0, accumulator 450 continuous cumulative mean power differences, 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) during greater than target power, described moving average filter 430 is output as negative value, make the value of accumulator 450 reduce, thereby the output of automatic gain control equipment 400 diminishes, and then multiplication factor that can control amplifier reduces, and makes input range diminish; Otherwise the value of moving average filter 430 is for just, and the value of accumulator 450 increases, it is big that the output of automatic gain control equipment 400 becomes, and then the increase of the multiplication factor of amplifier, make input range increase, thereby reach of the effect of automatic adjusting input range to desired value.
When input signal amplitude and desired value differ 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 the second threshold value d2 (d2＞d1), the accumulator 450 of automatic gain control equipment 400 does not just add up, thereby keep multiplication factor constant, play the effect of stabilization signal.Have only the fluctuation of input signal amplitude bigger, automatic gain control equipment 400 just can go to regulate again.Like this, when input intermediate-freuqncy signal SIF was more stable signal, automatic gain control equipment 400 can not change signal gain, can not produce stabilization signal and disturb, and reduce distorted signals.When influencing the quality of reception when signal generation acute variation, automatic gain control equipment 400 will be jumped out from lock-out state, again signal is carried out gain controlling, and signal is returned to the suitable level that gets.
The invention also discloses a kind of audio control system,, be the composition structure chart of a kind of audio control system first embodiment of the present invention with reference to Fig. 7.Described audio control system 700 comprises adjustable amplifier 710, demodulating equipment 720 and automatic gain control equipment 400.Described automatic gain control equipment 400 is described in detail in Fig. 4, Fig. 5, described each embodiment of 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 gets final product, 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 above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. an automatic gain control equipment is characterized in that, comprises extraction unit, first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit is used for intermediate-freuqncy signal is carried out power draw, obtains the signal transient performance number;
Described first adder unit is used for described signal transient performance number and target power value are subtracted each other, and obtains signal instantaneous power difference value;
Described moving average filter is used for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit is used for producing locking signal according to described average power difference value, and described locking signal is used to control described accumulator and is in locking or unties state;
Described accumulator is used for cumulative mean power difference when untiing state, the output automatic gaining controling signal.
2. automatic gain control equipment according to claim 1 is characterized in that, described lock-in circuit comprises:
First judging unit is used to judge that whether described average power difference value is less than first threshold d1;
Whether second judging unit is used to judge described average power difference value greater than the second threshold value d2, and the described second threshold value d2 is greater than described first threshold d1;
Generation unit is used for generating first locking signal of the described accumulator of locking when the described average power difference value of described first judgment unit judges during less than described first threshold d1, controls described accumulator and does not add up; When the described average power difference value of described second judgment unit judges during greater than the described second threshold value d2, generate second locking signal of untiing described accumulator, control described accumulator and add up.
3. automatic gain control equipment according to claim 1 and 2 is characterized in that, also comprises:
The removing DC road is used for the intermediate-freuqncy signal of input is carried out in-line filtration, removes the DC component in the described intermediate-freuqncy signal.
4. automatic gain control equipment according to claim 3 is characterized in that, described removing DC road comprises:
Low pass filter is used for extracting the DC component of the intermediate-freuqncy signal of described input;
Second adder unit is used for the intermediate-freuqncy signal of described input is deducted the DC component that described low pass filter is exported, and the intermediate-freuqncy signal of DC component is removed in output.
5. automatic gain control equipment according to claim 4 is characterized in that, also comprises:
First input unit is used to import target power value.
6. automatic gain control equipment according to claim 5 is characterized in that, also comprises:
Second input unit is used to import the first threshold d1 and the second threshold value d2.
7. 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, first adder unit, moving average filter, lock-in circuit, accumulator;
Described extraction unit is used for intermediate-freuqncy signal is carried out power draw, obtains the signal transient performance number;
Described first adder unit is used for described signal transient performance number and target power value are subtracted each other, and obtains signal instantaneous power difference value;
Described moving average filter is used for obtaining average power difference value according to described signal instantaneous power difference value;
Described lock-in circuit is used for producing locking signal according to described average power difference value, and described locking signal is used to control described accumulator and is in locking or unties state;
Described accumulator is used for cumulative mean power difference when untiing state, exports automatic gaining controling signal, controls the multiplication factor of described adjustable amplifier.
8. audio control system according to claim 7 is characterized in that, described lock-in circuit comprises:
First judging unit is used to judge that whether described average power difference value is less than first threshold d1;
Whether second judging unit is used to judge described average power difference value greater than the second threshold value d2, and the described second threshold value d2 is greater than described first threshold d1;
Generation unit is used for generating first locking signal of the described accumulator of locking when the described average power difference value of described first judgment unit judges during less than described first threshold d1, controls described accumulator and does not add up; When the described average power difference value of described second judgment unit judges during greater than the described second threshold value d2, 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.
9. according to claim 7 or 8 described audio control systems, it is characterized in that described automatic gain control equipment also comprises:
The removing DC road is used for the intermediate-freuqncy signal of input is carried out in-line filtration, removes the DC component in the described intermediate-freuqncy signal.
10. audio control system according to claim 9 is characterized in that, described removing DC road comprises:
Low pass filter is used for extracting the DC component of the intermediate-freuqncy signal of described input;
Second adder unit is used for the intermediate-freuqncy signal of described input is deducted the DC component that described low pass filter is exported, and the intermediate-freuqncy signal of DC component is removed in output.
11. audio control system according to claim 10 is characterized in that, described automatic gain control equipment also comprises:
First input unit is used to import target power value.
12. audio control system according to claim 11 is characterized in that, described automatic gain control equipment also comprises:
Second input unit is used to import the first threshold d1 and the second threshold value d2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910085867.0A CN101692601B (en) | 2009-06-03 | 2009-06-03 | Automatic gain control device and audio control system comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910085867.0A CN101692601B (en) | 2009-06-03 | 2009-06-03 | Automatic gain control device and audio control system comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101692601A true CN101692601A (en) | 2010-04-07 |
| CN101692601B CN101692601B (en) | 2014-03-26 |
Family
ID=42081264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910085867.0A Active CN101692601B (en) | 2009-06-03 | 2009-06-03 | Automatic gain control device and audio control system comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101692601B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186234A (en) * | 2011-03-18 | 2011-09-14 | 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 |
| CN106936387A (en) * | 2017-03-24 | 2017-07-07 | 合肥工业大学 | The correcting module and its method of sine and cosine measurement signal |
| 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 |
| CN109120292A (en) * | 2018-08-06 | 2019-01-01 | 电子科技大学 | A kind of digital automatic gain control system and method |
| 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 |
| CN116192072A (en) * | 2023-04-25 | 2023-05-30 | 成都允高科技有限公司 | Digital audio AGC linear gain modulation method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5563916A (en) * | 1995-06-05 | 1996-10-08 | Hitachi America, Ltd. | Apparatus and method for varying the slew rate of a digital automatic gain control circuit |
| CN1430413A (en) * | 2002-01-02 | 2003-07-16 | 三星电子株式会社 | Automatic gain controller and method for outputing gain control signal |
| US6668027B1 (en) * | 1999-03-02 | 2003-12-23 | Hitachi America, Ltd. | Self adjusting automatic gain control (AGC) power reference level circuit |
| CN1917380A (en) * | 2006-08-01 | 2007-02-21 | 华为技术有限公司 | Method for eliminating dc bias for receiver and signal process module |
-
2009
- 2009-06-03 CN CN200910085867.0A patent/CN101692601B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5563916A (en) * | 1995-06-05 | 1996-10-08 | Hitachi America, Ltd. | Apparatus and method for varying the slew rate of a digital automatic gain control circuit |
| US6668027B1 (en) * | 1999-03-02 | 2003-12-23 | Hitachi America, Ltd. | Self adjusting automatic gain control (AGC) power reference level circuit |
| CN1430413A (en) * | 2002-01-02 | 2003-07-16 | 三星电子株式会社 | Automatic gain controller and method for outputing gain control signal |
| CN1917380A (en) * | 2006-08-01 | 2007-02-21 | 华为技术有限公司 | Method for eliminating dc bias for receiver and signal process module |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186234A (en) * | 2011-03-18 | 2011-09-14 | 上海华为技术有限公司 | Gain control circuit and method |
| 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 |
| CN106936387A (en) * | 2017-03-24 | 2017-07-07 | 合肥工业大学 | The correcting module and its method of sine and cosine measurement signal |
| CN106936387B (en) * | 2017-03-24 | 2020-02-14 | 合肥工业大学 | Correction module and method for sine and cosine measurement signals |
| CN109120292A (en) * | 2018-08-06 | 2019-01-01 | 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 |
| CN116192072A (en) * | 2023-04-25 | 2023-05-30 | 成都允高科技有限公司 | Digital audio AGC linear gain modulation method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101692601B (en) | 2014-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101692601B (en) | Automatic gain control device and audio control system comprising same | |
| US7929650B2 (en) | AGC for narrowband receivers | |
| US8095095B2 (en) | Band switch control apparatus for intermediate frequency filter | |
| US20130324065A1 (en) | Method and Apparatus for Auto Gain Control in Radio Receiver | |
| US7113758B2 (en) | Automatic gain controller | |
| US7680473B2 (en) | Circuits and methods for signal gain control | |
| WO2012017627A1 (en) | High frequency receiver apparatus and radio receiver | |
| JP2010263430A (en) | Receiving apparatus | |
| JP3959320B2 (en) | Receiver and AGC method | |
| JP2009182589A (en) | Rf receiver | |
| US9425759B2 (en) | Receiver circuit and gain controlling method thereof | |
| JP2007184693A (en) | Fm tuner | |
| CN101453596A (en) | Automatic gain control circuit | |
| US20120142297A1 (en) | Receiver | |
| JP2006237793A (en) | High-frequency signal receiver and high-frequency signal receiver using the same | |
| US8106709B2 (en) | Pre and post filter automatic gain control with bounded pre-filter gain control | |
| CN101183876A (en) | Noise eliminating device | |
| CN114499561A (en) | Wireless communication receiver and automatic gain control device and control method thereof | |
| US20080076376A1 (en) | Method and system for removing radio frequency direct current offset in signal | |
| CN101986695B (en) | Demodulation chip and set top box as well as method for adjusting gain of set top box | |
| EP1499014B1 (en) | A method for automatic gain control, for instance in a telecommunication system, device and computer program therefor | |
| JP2005192060A (en) | Automatic gain control apparatus | |
| KR101045536B1 (en) | Received signal strength indication apparatus of wide-band rf receiver | |
| CN101764975B (en) | Digital demodulation device and digital demodulation method | |
| CN111786691A (en) | Automatic gain control method and system of receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180412 Address after: 100191 Xueyuan Road, Haidian District, Haidian District, Beijing, No. 607, No. six Patentee after: Beijing Vimicro AI Chip Technology Co Ltd Address before: 100083, Haidian District, Xueyuan Road, Beijing No. 35, Nanjing Ning building, 15 Floor Patentee before: Beijing Vimicro Corporation |
|
| TR01 | Transfer of patent right |