CN206533346U - A kind of gain control - Google Patents
A kind of gain control Download PDFInfo
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- CN206533346U CN206533346U CN201720089895.XU CN201720089895U CN206533346U CN 206533346 U CN206533346 U CN 206533346U CN 201720089895 U CN201720089895 U CN 201720089895U CN 206533346 U CN206533346 U CN 206533346U
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Abstract
The utility model provides a kind of gain control, amplitude detection circuit and gain control circuit are pushed up including forward gain amplifier, voltage control circuit, modulation circuit, amplitude detection circuit, zero cross detection circuit, anti-cut, the forward gain amplifier, voltage control circuit and modulation circuit are sequentially connected, the voltage control circuit connects the gain control circuit by the amplitude detection circuit and zero cross detection circuit respectively, and the modulation circuit connects the gain control circuit by the anti-top amplitude detection circuit of cutting.The gain control that the utility model is provided can keep good sound quality, while loudspeaker can be protected effectively, it is to avoid loudspeaker exceedes peak power and damaged.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to gain control device.
Background
The audio amplifier amplifies the power of the audio signal to drive the loudspeaker to amplify the sound. In the audio processing process, in order to improve the effect of music playing and increase the loudness of music playing, it is usually necessary to perform automatic gain control on the input audio signal to adjust the signal amplitude of the input audio signal, attenuate large-amplitude signals, amplify small-amplitude signals, and ensure the stability of the signal amplitude. Most current audio power amplifiers have an Automatic Gain Control (AGC) function. AGC is an automatic control method for automatically adjusting the gain of an amplifier circuit according to signal strength, and AGC automatic gain control circuits function as an automatic control circuit for automatically keeping the amplitude of an output signal within a small range when the amplitude of an input signal changes greatly.
In the gain control method in the prior art, when the output power of the amplifier is detected to be greater than the predetermined power threshold, the output power can be maintained at the set power threshold. However, the existing gain control method is easy to cause distortion when controlling the gain, and the audio playing effect is influenced; meanwhile, when the output signal of the amplifier is detected to be larger than the preset threshold value, although the output signal can be automatically reduced, the signal output value already exceeds the maximum power value of the loudspeaker in the process, and the loudspeaker is easily damaged.
Patent document CN104485909A discloses a gain control method and device, which uses multiple sets of AGC control circuits to determine the output of an amplifier, and performs gain control for different time periods according to different output sizes, so as to improve the playing effect of music files and improve the user experience. However, when the output exceeds a first predetermined threshold (e.g., the maximum power of the speaker), the gain will drop rapidly, but the signal output will exceed the maximum power of the speaker, or the speaker will be damaged. Meanwhile, the judgment of whether the output is clipped or not by the D-class audio amplifier is judged from the output of the integrator, the judgment of different output powers is judged from the output of the first-stage adjustable gain amplifier, and the judgment positions of the two mechanisms are different, so that the D-class audio amplifier is not suitable for being used on the D-class audio amplifier.
Patent document CN104767498A discloses a gain control method and apparatus, which uses zero-crossing detection to avoid adjusting the gain of the amplifier at the peak of the output signal, thereby improving the music playing effect. However, when there are multiple sets of AGC control circuits, it is not possible to choose whether zero crossing detection is required to change the gain. If a low frequency music signal is input, when the output signal exceeds the maximum power limit of the loudspeaker, the gain must be reduced rapidly in time, and if the gain must be changed after the zero-crossing detection, the loudspeaker may be damaged. In addition, the second detection circuit of the zero-crossing detection circuit uses the high threshold and the low threshold level to determine the output signal, that is, the output signal is not sent out at the lowest point, so that a certain noise is still caused when the gain is changed, and the playing effect is affected.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model discloses an aim at has designed a gain control device, can keep good sound quality, can effectively protect the speaker simultaneously, avoids the speaker to exceed maximum power and damage.
The utility model discloses specific technical scheme as follows:
a gain control device comprises a pre-gain amplifier, a voltage control circuit, a modulation circuit, an amplitude detection circuit, a zero-crossing detection circuit, a topping-prevention amplitude detection circuit and a gain control circuit, wherein the pre-gain amplifier, the voltage control circuit and the modulation circuit are sequentially connected, the voltage control circuit is respectively connected with the gain control circuit through the amplitude detection circuit and the zero-crossing detection circuit, and the modulation circuit is connected with the gain control circuit through the topping-prevention amplitude detection circuit; wherein,
the voltage control circuit is used for detecting and controlling an output signal of the pre-stage gain amplifier;
the amplitude detection circuit is used for receiving the output signal of the voltage control circuit, comparing the output signal with a preset threshold value and outputting a corresponding gain signal;
the zero-crossing detection circuit is used for judging whether an output signal of the voltage control circuit crosses a zero point or not and outputting a corresponding gain signal to the gain control circuit when the output signal crosses the zero point;
the anti-clipping amplitude detection circuit is used for detecting whether clipping occurs in the output signal of the modulation circuit or not and outputting a corresponding gain signal to the gain control circuit when clipping occurs;
the gain control circuit is used for judging whether gain control is needed according to gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and controlling the gain of the front-stage gain amplifier when the gain control is needed.
Specifically, gain control device is applicable to D class audio amplifier.
Specifically, range detection circuitry includes a N range detection circuitry, and N is greater than or equal to 1.
Specifically, the gain control circuit further includes: and respectively receiving the gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and judging whether the zero crossing point is required to carry out gain control.
Specifically, voltage control circuit includes: the first comparator, the first control switch, the second comparator and the second control switch;
the input end of the first comparator is respectively connected with the output signal of the preceding gain amplifier and a first reference voltage, and the output end of the first comparator is connected with the first control switch;
the input end of the second comparator is respectively connected with the output signal of the preceding gain amplifier and a second reference voltage, and the output end of the second comparator is connected with the second control switch.
Specifically, zero crossing detection circuit includes: the input end of the third comparator is respectively connected with the output signal of the voltage control circuit, one path of the output end of the third comparator is connected with the first delay circuit through a NOT gate, the other path of the output end of the third comparator is directly connected with the second delay circuit, and the output ends of the first delay circuit and the second delay circuit are respectively connected with two input ends of the XOR gate.
The utility model provides a gain control device compares with prior art and has following advantage:
(1) the loudspeaker can be effectively protected through the voltage control circuit, and the loudspeaker is prevented from being damaged due to the fact that the loudspeaker exceeds the maximum power;
(2) the provided multiple groups of AGC gain control functions are combined with zero-crossing detection and anti-topping detection, output signals can be completely judged, so that how the gain changes can be further judged, a loudspeaker can be effectively protected, and good sound quality is kept;
(3) the zero-crossing detection circuit can change the gain at the minimum signal, avoid generating noise when the gain is changed and keep good sound quality.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of the present invention;
fig. 2 is a circuit diagram of a first embodiment of the present invention;
fig. 3 is a graph showing the relationship between the amplifier signal and the gain according to the present invention;
fig. 4 is a circuit diagram of the voltage control circuit of the present invention;
fig. 5 is a circuit diagram of the amplitude detection circuit of the present invention;
fig. 6 is a schematic diagram of input and output of the amplitude detection circuit of the present invention;
fig. 7 is a circuit diagram of the zero-crossing detection circuit of the present invention;
fig. 8 is an input/output schematic diagram of the zero-crossing detection circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
The utility model provides a gain control device, please refer to fig. 1, include preceding stage gain amplifier, voltage control circuit, modulation circuit, amplitude detection circuit, zero crossing detection circuit, prevent cutting a amplitude detection circuit and gain control circuit, preceding stage gain amplifier, voltage control circuit and modulation circuit connect gradually, voltage control circuit passes through respectively amplitude detection circuit and zero crossing detection circuit connect gain control circuit, the modulation circuit passes through prevent cutting a amplitude detection circuit and connect gain control circuit. Wherein,
the voltage control circuit is used for detecting and controlling an output signal of the pre-stage gain amplifier;
the amplitude detection circuit is used for receiving the output signal of the voltage control circuit, comparing the output signal with a preset threshold value and outputting a corresponding gain signal;
the zero-crossing detection circuit is used for judging whether an output signal of the voltage control circuit crosses a zero point or not and outputting a corresponding gain signal to the gain control circuit when the output signal crosses the zero point;
the anti-clipping amplitude detection circuit is used for detecting whether clipping occurs in the output signal of the modulation circuit or not and outputting a corresponding gain signal to the gain control circuit when clipping occurs;
the gain control circuit is used for judging whether gain control is needed according to gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and controlling the gain of the front-stage gain amplifier when the gain control is needed.
The utility model provides a gain control device can effectively protect the speaker, avoids the speaker impaired. Adding a voltage control circuit to the output of the first-stage pre-gain amplifier, wherein the set voltage control point is the maximum power P of the load loudspeakerMAX. When the output voltage of the amplifier exceeds the maximum power of the loudspeaker, the output voltage of the amplifier is limited at the maximum voltage point by the voltage control circuit, the voltage is not exceeded, meanwhile, the amplitude detection circuit detects the output of the voltage control circuit and outputs a gain reduction signal to the gain control circuit, and the gain is rapidly reduced.
Specifically, the gain control circuit further includes: and respectively receiving the gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and judging whether the zero crossing point is required to carry out gain control. The utility model discloses a zero cross detection judges whether need come the gain that falls at signal zero crossing via gain control circuit. If the output signal has exceeded PMAXOr when the voltage output signal is subjected to clipping distortion, the gain control circuit can immediately reduce the gain at the fastest speed without waiting for a zero-crossing signal. Especially when the input is a low frequency signal, if the gain is reduced by waiting for the zero crossing signal, the loudspeaker is in a high voltage condition for a long time, which is easy to damage. And if the output is truncated distortion, the gain is not rapidly reduced, which may cause the sound quality to be impaired. The utility model discloses let the check point more be close to zero point, avoid changing the gain in the higher position of signal, cause the noise.
Specifically, gain control device is applicable to D class audio amplifier, and the modulation circuit adopts D class modulation circuit. Fig. 2 is a circuit diagram of the first embodiment.
The amplitude detection circuit can have a plurality of groups, and the amplitude detection circuit comprises N amplitude detection circuits, wherein N is more than or equal to 1. The speed of gain reduction can be adjusted according to the power limit range of the loudspeaker, and the dynamic range of sound is increased.
Referring to the relationship between the amplifier signal and the gain of fig. 3, the present embodiment is provided with a three-step amplitude detection circuit, which respectively has the maximum power PMAXBuffer power PMEDRated power PRMS. The power of the loudspeaker can not exceed PMAXOtherwise, it will be damaged. The power of the loudspeaker can be operated at P for a long timeRMSDown, and is between PMAXAnd PRMSThe power of the sound can be adjusted properly to stay in the power range in a short time, so that the dynamic range of the sound can be enlarged. This is achieved by adding PMEDPower judgment of PMEDIs about PRMS1.2 times of PRMSThe buffer power of the sound source is increased by one group of power judgment and time control, so that the sound loudness is richer.
Referring to the region A in FIG. 3, when the sound suddenly increases to exceed PMAXMeanwhile, the gain control circuit controls the gain to rapidly drop (such as 0.16ms/dB) to reduce the signal to PMAXThe following. Or, in other cases, when the amplifier supply voltage is low, not yet reaching PMAXAt this time, the gain control circuit also controls the gain to drop rapidly (such as 0.16ms/dB), so that the sound signal is not distorted, and unpleasant sound is prevented from being output.
Referring to region B of FIG. 3, when the output is between PMAXAnd PMEDAt times, the gain will drop off at a moderate rate (e.g., 0.64ms/dB), allowing for a brief large volume output. Region C in FIG. 3, when the output is between PMEDAnd PRMSThe gain is controlled to drop slowly (e.g., 21ms/dB) to allow for a brief large volume output. Region D in FIG. 3, when the output is between PRMSAnd PHYSThe gain is maintained. In the region E, F, G of FIG. 3, when the input signal is smaller and the gain is maintained for 10ms, the gain is slowly restored (e.g., 41ms/dB) until the initial value of the gain is restored or the output is between PRMSAnd PHYSIt will stop when it is.
Specifically, please refer to fig. 4, which is a circuit diagram of a voltage control circuit, the voltage control circuit of the present embodiment includes: a first comparator OP _ H, a first control switch MP _ H, a second comparator OP _ L and a second control switch MP _ L. The input end of the first comparator is respectively connected with the output signal of the preceding gain amplifier and a first reference voltage, and the output end of the first comparator is connected with the first control switch; the input end of the second comparator is respectively connected with the output signal of the preceding gain amplifier and a second reference voltage, and the output end of the second comparator is connected with the second control switch.
Voltage control circuit for preventing output power from exceeding maximum power P of loudspeakerMAXAnd the speaker is damaged. The working principle is that by detecting the relationship between the output signals VOP and VON of the pre-gain amplifier and the reference voltage Vref _ H, Vref _ L, when VOP or VON exceeds the upper limit Vref _ H or is lower than the lower limit Vref _ L, the comparator OP _ H or OP _ L circuit is started to control the first control switch MP _ H or the second control switch MP _ L to limit the output signal of the gain amplifier, so as to limit the voltage of VOP and VON.
Specifically, please refer to fig. 5, which is a circuit diagram of the amplitude detection circuit, in which the output signals VOP and VON of the voltage control circuit are respectively connected to VrefRMS、VrefHYSBy comparison, ATT can be obtainedRMSAnd RLSRMSThe signal is then sent to the gain control circuit for gain control.
FIG. 6 is a schematic diagram of the input and output of the amplitude detection circuit, ATTRMSFor high levels, the gain control circuit prepares the reduced gain, RLSRMSAt high level, the gain control circuit prepares to increase the gain. Vref (reference sign)RMSAnd VrefHYSThe difference of (2) must exceed the gain reduction amplitude of 1 bit, otherwise, the gain is jumped up and down. The purpose of the delay circuit is to prevent the circuit from malfunctioning due to interference, and the delay time may be several microseconds. Other different amplitude determinations can be achieved by the same amplitude detection circuit architecture.
The clipping-prevention amplitude detection circuit is similar to the amplitude detection circuit, and referring to fig. 5, the reference voltage is the upper limit value of the triangular wave. The PWM generator of the class D modulator-inside-device compares the VOPs 1 and VON1 output from the integrator with the triangular wave to obtain the PWM signal. When the output signal has the clipping condition, i.e. the duty of OUTP and OUTN reaches 100% or 0%, the output signals of the integrator (VOP1 and VON1) exceed the amplitude range of the triangular wave, so that it can be determined whether the amplifier output has the clipping condition or not by determining whether the output of the integrator exceeds the upper limit of the triangular wave. When topping occurs, the amplifier will quickly reduce the gain to avoid hearing distorted sound
Specifically, please refer to fig. 7, which is a circuit diagram of the zero-crossing detection circuit. The zero-cross detection circuit includes: the input end of the third comparator is respectively connected with the output signal of the voltage control circuit, one path of the output end of the third comparator is connected with the first delay circuit through a NOT gate, the other path of the output end of the third comparator is directly connected with the second delay circuit, and the output ends of the first delay circuit and the second delay circuit are respectively connected with two input ends of the XOR gate. The third comparator is used to compare the output signals VOP and VON of the voltage control circuit, and a pulse signal is obtained after the delay circuit and the XOR gate operation, and the pulse width is determined by the delay circuit.
Fig. 8 is a schematic diagram of input and output of the zero-crossing detection circuit. When the input signal stops suddenly, VOP and VON cannot cross each other, the comparator cannot generate a change, and at this time, the pulse detection circuit detects whether no pulse signal is sent in a period of time. If the pulse signal is not sent next pulse within 50ms from the previous pulse signal, the pulse detection circuit will force a pulse signal to be sent out, so that the gain control circuit can control the gain smoothly. The forced pulse is sent without input signal, so the gain change is at the time of minimum signal, so the noise will not be generated when the gain is changed.
Specifically, the gain control circuit receives signals from the amplitude detection circuit, the anti-clipping amplitude detection circuit and the zero point detection circuit, respectively, and determines whether the gain needs to be reduced or restored, and controls the gain of the preamplifier at which speed the gain is reduced, whether the gain needs to be reduced at a zero crossing point, and the like.
The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. A gain control device is characterized by comprising a pre-gain amplifier, a voltage control circuit, a modulation circuit, an amplitude detection circuit, a zero-crossing detection circuit, a topping-prevention amplitude detection circuit and a gain control circuit, wherein the pre-gain amplifier, the voltage control circuit and the modulation circuit are sequentially connected, the voltage control circuit is respectively connected with the gain control circuit through the amplitude detection circuit and the zero-crossing detection circuit, and the modulation circuit is connected with the gain control circuit through the topping-prevention amplitude detection circuit; wherein,
the voltage control circuit is used for detecting and controlling an output signal of the pre-stage gain amplifier;
the amplitude detection circuit is used for receiving the output signal of the voltage control circuit, comparing the output signal with a preset threshold value and outputting a corresponding gain signal;
the zero-crossing detection circuit is used for judging whether an output signal of the voltage control circuit crosses a zero point or not and outputting a corresponding gain signal to the gain control circuit when the output signal crosses the zero point;
the anti-clipping amplitude detection circuit is used for detecting whether clipping occurs in the output signal of the modulation circuit or not and outputting a corresponding gain signal to the gain control circuit when clipping occurs;
the gain control circuit is used for judging whether gain control is needed according to gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and controlling the gain of the front-stage gain amplifier when the gain control is needed.
2. The gain control device of claim 1, wherein the gain control device is adapted for a class D audio amplifier.
3. The gain control device of claim 1, wherein the amplitude detection circuit comprises N amplitude detection circuits, N ≧ 1.
4. The gain control device of claim 1, wherein the gain control circuit further comprises: and respectively receiving the gain signals output by the amplitude detection circuit, the zero-crossing detection circuit and the anti-topping amplitude detection circuit, and judging whether gain control is required when a zero crossing point is required.
5. The gain control device of claim 1, wherein the voltage control circuit comprises: the first comparator, the first control switch, the second comparator and the second control switch;
the input end of the first comparator is respectively connected with the output signal of the preceding gain amplifier and a first reference voltage, and the output end of the first comparator is connected with the first control switch;
the input end of the second comparator is respectively connected with the output signal of the preceding gain amplifier and a second reference voltage, and the output end of the second comparator is connected with the second control switch.
6. The gain control apparatus of claim 1, wherein the zero crossing detection circuit comprises: the input end of the third comparator is respectively connected with the output signal of the voltage control circuit, one path of the output end of the third comparator is connected with the first delay circuit through a NOT gate, the other path of the output end of the third comparator is directly connected with the second delay circuit, and the output ends of the first delay circuit and the second delay circuit are respectively connected with two input ends of the XOR gate.
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| CN201720089895.XU CN206533346U (en) | 2017-01-20 | 2017-01-20 | A kind of gain control |
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| CN201720089895.XU CN206533346U (en) | 2017-01-20 | 2017-01-20 | A kind of gain control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656085A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Gain control device |
| CN109788402A (en) * | 2019-01-31 | 2019-05-21 | 维沃移动通信有限公司 | A kind of acoustic signal processing method and audio signal processor |
-
2017
- 2017-01-20 CN CN201720089895.XU patent/CN206533346U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656085A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Gain control device |
| WO2018133565A1 (en) * | 2017-01-20 | 2018-07-26 | 深圳市中移联半导体科技有限公司 | Gain control device |
| CN109788402A (en) * | 2019-01-31 | 2019-05-21 | 维沃移动通信有限公司 | A kind of acoustic signal processing method and audio signal processor |
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Effective date of registration: 20190505 Address after: 518000 Guangdong Province, Futian District, Shenzhen, 1063 Xiangmei Road, Shuixie Flower Du Mingcuiju 2 20B Patentee after: Lin Qiliang Address before: 518000 No. 22 Huanping Road, Gaoqiao Community, Pingdi Street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN ZYL SEMICONDUCTOR TECHNOLOGY Co.,Ltd. |
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