CN202873032U - Sound source adaptive control system - Google Patents
Sound source adaptive control system Download PDFInfo
- Publication number
- CN202873032U CN202873032U CN 201220452835 CN201220452835U CN202873032U CN 202873032 U CN202873032 U CN 202873032U CN 201220452835 CN201220452835 CN 201220452835 CN 201220452835 U CN201220452835 U CN 201220452835U CN 202873032 U CN202873032 U CN 202873032U
- Authority
- CN
- China
- Prior art keywords
- conducting device
- way conducting
- audio signal
- control chip
- numerical control
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a sound source adaptive control system, comprising an audio signal gain numerical control chip, a distortion detection circuit connected with the audio signal gain numerical control chip, and a processor respectively connected with the distortion detection circuit and the audio signal gain numerical control chip. The audio signal gain numerical control chip, the distortion detection circuit and the processor form a closed loop feedback system. The sound source adaptive control system can automatically detect that audio input signals exceed preset values and give orders to the audio signal gain numerical control chip through the processor, thereby controlling the audio input signals in a preset value range through reducing audio signal gain.
Description
Technical field
The utility model relates to a kind of source of sound adaptive control system, particularly a kind of source of sound adaptive control system of active audio amplifier sound intermediate frequency input signal when excessive that be applied in.
Background technology
Along with the development of science and technology, increasing audio-frequency signal output apparatus has appearred, such as desktop computer, notebook, mobile phone, MP3, CD player, high definition player, television set etc.But because the unified standard of audio-frequency signal output apparatus neither one, so caused same song to utilize the audio signal of distinct device output also far from each other, design has brought very large obstacle to active audio amplifier.Active audio amplifier is to guarantee to bring as far as possible the audio that shakes most under the distortionless prerequisite of sound, but because the big or small disunity of audio input signal has caused active audio amplifier to be difficult to find a suitable input signal as the reference standard when design.The situation of audio distortions will appear in the active audio amplifier that goes out as reference design with less input signal when accessing larger input signal, otherwise can not reach the output limit of active audio amplifier when accessing than small-signal with the active audio amplifier that large-signal goes out as reference design.
The utility model content
The purpose of this utility model is that a kind of source of sound adaptive control system of active audio amplifier sound intermediate frequency input signal when excessive that be applied in will be provided.When audio input signal surpasss the expectation the value of setting, can automatically detect and send instruction to audio signal gain numerical control chip by processor, thereby gain audio input signal is controlled within the expection set point by reducing audio signal.
The utility model adopts following technical scheme:
The utility model provides a kind of source of sound adaptive control system, it comprises: audio signal gain numerical control chip, with the interconnective distortion detection circuit of described audio signal gain numerical control chip, and with described distortion detection circuit, audio signal gain numerical control chip interconnective processor respectively, described audio signal gain numerical control chip, distortion detection circuit and processor consist of a closed loop feedback system.
In a preferred embodiment, described processor is microprocessor.
In a preferred embodiment, described distortion detection circuit comprises electric capacity, the first resistance, the second resistance, the first one way conducting device, the 3rd resistance, operational amplifier, the 4th resistance, the second one way conducting device and the 3rd one way conducting device, wherein,
The input of described audio signal gain numerical control chip is used for the audio reception input signal, and its output connects electric capacity, and connects the first resistance and ground connection by electric capacity;
Described electric capacity one end connects the output of audio signal gain numerical control chip, and the other end connects the first one way conducting device by the second resistance;
Described the first one way conducting device one end connects the second resistance, the in-phase input end of other end concatenation operation amplifier;
The in-phase input end of described the 3rd resistance one end concatenation operation amplifier, other end ground connection;
Described the 4th resistance one end connects voltage source, the inverting input of other end concatenation operation amplifier;
The inverting input of described operational amplifier connects the second one way conducting device, and by the second one way conducting device ground connection, the output of operational amplifier connects the 3rd one way conducting device, and connects microprocessor by the 3rd one way conducting device;
Described microprocessor one end connects the 3rd one way conducting device, and the other end connects the control end of audio signal gain numerical control chip.
In a preferred embodiment, described the first one way conducting device, the second one way conducting device, the 3rd one way conducting device are respectively diode.
In a preferred embodiment, described the first one way conducting device, the second one way conducting device are respectively silicon diode.
In a preferred embodiment, described the first one way conducting device, the second one way conducting device, the 3rd one way conducting device are respectively circuit structure or the integrated circuit with one-way conduction function.
A kind of source of sound adaptive control system that the utility model proposes, utilize processor to carry out distortion detection according to distortion detection circuit and judge whether audio signal surpasses set point, if surpass then send conditioning signal to audio signal gain numerical control chip by processor, gain audio input signal is controlled within the expection set point thereby reduce audio signal by audio signal gain numerical control chip, avoid that audio input signal is excessive to cause the active audio amplifier output distortion.Compared to prior art, a kind of source of sound adaptive control system that the utility model proposes, its advantage is: at first, can not occur the situation of distortion when accessing the audio input signal of any size.Secondly, in the active audio amplifier design process, can bring into play as far as possible the fan-out capability of active audio amplifier rear class amplifying circuit.Moreover, in the active audio amplifier design process, but flexible Application and this system of transplanting.According to the active audio amplifier fan-out capability of different model, build with circuit and to set out different audio input signal desired values, just distortion of active audio amplifier output when surpassing desired value.
Description of drawings
Fig. 1 is the structural representation of a kind of source of sound adaptive control system of the utility model.
Fig. 2 is an embodiment electrical block diagram of a kind of source of sound adaptive control system of the utility model.
The tool present embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
See also Fig. 1, it is the structural representation of a kind of source of sound adaptive control system of the utility model.
A kind of source of sound adaptive control system of the utility model, it comprises: audio signal gain numerical control chip 11, with described audio signal gain numerical control chip 11 interconnective distortion detection circuits 12, and, with described distortion detection circuit 12, the interconnective processor 13 of audio signal gain numerical control chip 11 difference.Audio signal gain numerical control chip 11, distortion detection circuit 12 and processor 13 consist of a closed loop feedback system.
The utility model is at first by being input to audio input signal audio signal gain numerical control chip 11, applies gain by audio signal gain numerical control chip 11 to audio input signal, and so that audio input signal is transformed into unidirectional Rectified alternating current; Then, be linked into again distortion detection circuit 12, carry out distortion detection, when distortion occurring, by the detection of processor 13, by processor 13 to audio signal gain numerical control chip 11 feedback regulation signals; Afterwards, audio signal gain numerical control chip 11 is regulated the audio input signal of input according to conditioning signal, adjusts audio signal and gains to an appropriate value, thereby avoided audio input signal to cause the active audio amplifier output distortion.
Wherein, in the active audio amplifier circuit design, distortion detection circuit 12 is by utilizing the different principles that cause the saltus step of operational amplifier output level from anti-phase potential difference of operational amplifier homophase to detect whether value of surpassing the expectation of audio input signal.Described desired value is the upper limit that active audio amplifier is exported distortionless audio signal value.Processor 13 according to high-low level saltus step judge that active audio amplifier output whether can distortion and control audio signal in the desired value scope, namely can be greater than desired value yet.Processor 13 can be microprocessor (Micro Control Unit is referred to as MCU).
See also Fig. 2, it is an embodiment electrical block diagram of a kind of source of sound adaptive control system of the utility model.
A kind of source of sound adaptive control system of the utility model, it comprises: audio signal gain numerical control chip 21, capacitor C 1, the first resistance R 1, the second resistance R 2, the first one way conducting device D1, the 3rd resistance R 3, operational amplifier 22, the 4th resistance R 4, the second one way conducting device D2, the 3rd one way conducting device D3 and microprocessor 23.
In the present embodiment, the first one way conducting device D1, the second one way conducting device D2, the 3rd one way conducting device D3 can be respectively diode, also can be circuit structure or the integrated circuit with one-way conduction function.For the purpose of difference, be respectively diode and give an example with the first one way conducting device D1, the second one way conducting device D2, the 3rd one way conducting device D3.In addition, preferably, the first one way conducting device D1, the second one way conducting device D2 are respectively silicon diode, so the forward voltage drop tube of the first one way conducting device D1 and the second one way conducting device D2 is 0.7V.
Capacitor C 1, the first resistance R 1, the second resistance R 2, the first one way conducting device D1, the 3rd resistance R 3, operational amplifier 22, the 4th resistance R 4, the second one way conducting device D2, the 3rd one way conducting device D3 consist of distortion detection circuit.
In the present embodiment, the annexation of each assembly of above-mentioned a kind of source of sound adaptive control system is as described below:
The input of audio signal gain numerical control chip 21 is used for the audio reception input signal, its output connects capacitor C 1, and connecting the first resistance R 1 and ground connection by capacitor C 1, the output of in other words audio signal gain numerical control chip 21 connects capacitor C 1 and the first resistance R 1 and ground connection successively.
Capacitor C 1 one ends connect the output of audio signal gain numerical control chip 21, and the other end connects the first one way conducting device D1 by the second resistance R 2.
The first one way conducting device D1 one end connects the second resistance R 2, the in-phase input end of other end concatenation operation amplifier 22.
The in-phase input end of the 3rd resistance R 3 one end concatenation operation amplifiers 22, other end ground connection.
The 4th resistance R 4 one ends connect voltage source, the inverting input of other end concatenation operation amplifier 22.
The inverting input of operational amplifier 22 connects the second one way conducting device D2, and by the second one way conducting device D2 ground connection, the output of operational amplifier 22 connects the 3rd one way conducting device D3, and connects microprocessor 23 by the 3rd one way conducting device D3.
Microprocessor 23 1 ends connect the 3rd one way conducting device D3, and the other end connects the control end of audio signal gain numerical control chip 21.
For ease of understanding, will describe for example, can cause the active audio amplifier output distortion as example when the audio signal peak-to-peak value during greater than 2.8V, describe.
In the present embodiment, the operation principle of each assembly of above-mentioned a kind of source of sound adaptive control system is as described below:
The interface of audio signal gain numerical control chip 21 is provided with input, output and control end, and wherein, (1) input is used for the audio reception input signal; (2) 21 pairs of audio input signals of audio signal gain numerical control chip apply gain, and such as 0dB ,-5dB etc. export by output again; (3) control end of audio signal gain numerical control chip 21 can pass through microprocessor 23 to control end transmission instruction (such as conditioning signal) thereby the gain of setting audio input signal is big or small.First one way conducting device D1 of series connection behind the audio input signal process audio signal gain numerical control chip 21, in order to guarantee the first one way conducting device D1 normal operation, the first one way conducting device D1 connects with the second resistance R 2, and the first resistance R 1 in parallel and the 3rd resistance R 3 are carried out ground connection respectively at the first one way conducting device D1 and the second resistance R 2 two ends, then audio input signal is input to the in-phase input end of operational amplifier 22 by behind the first one way conducting device D1; Voltage source successively connect the 4th resistance R 4 and the second one way conducting device D2, ground connection then, the positive terminal with the second one way conducting device D2 is connected with the inverting input of operational amplifier 22 simultaneously, obtains like this voltage ratio than fiducial value Uin-; The output of operational amplifier 22 is connected and is linked into the input of microprocessor 23 behind the 3rd one way conducting device D3.Because the first one way conducting device D1 and the second one way conducting device D2 adopt silicon diode, so the forward voltage drop tube of the first one way conducting device D1 and the second one way conducting device D2 is 0.7V.If audio input signal through the first one way conducting device D1 halfwave rectifier after voltage be UAudio, the audio input signal peak-to-peak value is 2*UAudio, the normal phase input end voltage of operational amplifier 22 is Uin+, according to operation principle and the circuit of operational amplifier 22 following computing formula is arranged:
(1) output high level when Uin+＞Uin-; Output low level when Uin+≤Uin-; And Uin-=0.7V;
(2) when UAudio＜0.7V, the first not conducting of one way conducting device D1, thus 0V=Uin+＜Uin-, the output output low level of operational amplifier 22; Active audio amplifier output this moment can distortion;
(3) when 0.7V≤UAudio≤1.4V, the first one way conducting device D1 conducting, thus UAudio-0.7=Uin+≤Uin-, the output output low level of operational amplifier 22; Active audio amplifier output this moment can distortion;
(4) when UAudio＞1.4V, the first one way conducting device D1 conducting, thus UAudio-0.7=Uin+＞Uin-, the output output high level of operational amplifier 22; Active audio amplifier output this moment can distortion.
Can find out when audio input signal peak-to-peak value 2*UAudio surpasses 2.8V from above calculating will distortion, and the output output meeting of operational amplifier 22 becomes high level from low level during distortion.So can obtain conclusion, the explanation audio input signal is excessive when the output of operational amplifier 22 is exported high level, can cause the active audio amplifier output distortion, thereby realize distortion detection.
An end (can be called input) of microprocessor 23 joins by the output of the 3rd one way conducting device D3 and operational amplifier 22, the other end is connected with the control end of audio signal gain numerical control chip 21, when the input of microprocessor 23 detects the signal of operational amplifier 22 output high level, produce the control end that one group of conditioning signal that reduces audio signal gain outputs to audio signal gain numerical control chip 21 through logical process, thereby 21 pairs of audio input signals of control audio signal gain numerical control chip are regulated, realization reduces the audio signal peak-to-peak value in 2.8V, has so just avoided the active audio amplifier output distortion.
A kind of source of sound adaptive control system that the utility model proposes, utilize microprocessor to carry out distortion detection (impulse waveform of operational amplifier output terminal) according to distortion detection circuit and judge whether audio signal surpasses set point, if surpass then send conditioning signal to audio signal gain numerical control chip by microprocessor, gain audio input signal is controlled within the expection set point thereby reduce audio signal by audio signal gain numerical control chip, avoid that audio input signal is excessive to cause the active audio amplifier output distortion.
Compared to prior art, a kind of source of sound adaptive control system that the utility model proposes, its advantage is:
The situation that can not occur distortion when at first, accessing the audio input signal of any size.
Secondly, in the active audio amplifier design process, can bring into play as far as possible the fan-out capability of active audio amplifier rear class amplifying circuit.
Moreover, in the active audio amplifier design process, but flexible Application and this system of transplanting.According to the active audio amplifier fan-out capability of different model, build with circuit and to set out different audio input signal desired values, just distortion of active audio amplifier output when surpassing desired value.
Here description of the present utility model and application is illustrative, is not to want with scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that in the situation that does not break away from spirit of the present utility model or substantive characteristics, and the utility model can be with other form, structure, layout, and realize with other assembly and parts.In the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (6)
1. source of sound adaptive control system, it is characterized in that, comprise: audio signal gain numerical control chip, with the interconnective distortion detection circuit of described audio signal gain numerical control chip, and with described distortion detection circuit, audio signal gain numerical control chip interconnective processor respectively, described audio signal gain numerical control chip, distortion detection circuit and processor consist of a closed loop feedback system.
2. source of sound adaptive control system according to claim 1 is characterized in that, described processor is microprocessor.
3. source of sound adaptive control system according to claim 2, it is characterized in that, described distortion detection circuit comprises electric capacity, the first resistance, the second resistance, the first one way conducting device, the 3rd resistance, operational amplifier, the 4th resistance, the second one way conducting device and the 3rd one way conducting device, wherein
The input of described audio signal gain numerical control chip is used for the audio reception input signal, and its output connects electric capacity, and connects the first resistance and ground connection by electric capacity;
Described electric capacity one end connects the output of audio signal gain numerical control chip, and the other end connects the first one way conducting device by the second resistance;
Described the first one way conducting device one end connects the second resistance, the in-phase input end of other end concatenation operation amplifier;
The in-phase input end of described the 3rd resistance one end concatenation operation amplifier, other end ground connection;
Described the 4th resistance one end connects voltage source, the inverting input of other end concatenation operation amplifier;
The inverting input of described operational amplifier connects the second one way conducting device, and by the second one way conducting device ground connection, the output of operational amplifier connects the 3rd one way conducting device, and connects microprocessor by the 3rd one way conducting device;
Described microprocessor one end connects the 3rd one way conducting device, and the other end connects the control end of audio signal gain numerical control chip.
4. source of sound adaptive control system according to claim 3 is characterized in that, described the first one way conducting device, the second one way conducting device, the 3rd one way conducting device are respectively diode.
5. source of sound adaptive control system according to claim 4 is characterized in that, described the first one way conducting device, the second one way conducting device are respectively silicon diode.
6. source of sound adaptive control system according to claim 3 is characterized in that, described the first one way conducting device, the second one way conducting device, the 3rd one way conducting device are respectively circuit structure or the integrated circuit with one-way conduction function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452835 CN202873032U (en) | 2012-09-06 | 2012-09-06 | Sound source adaptive control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452835 CN202873032U (en) | 2012-09-06 | 2012-09-06 | Sound source adaptive control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202873032U true CN202873032U (en) | 2013-04-10 |
Family
ID=48039711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220452835 Expired - Fee Related CN202873032U (en) | 2012-09-06 | 2012-09-06 | Sound source adaptive control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202873032U (en) |
-
2012
- 2012-09-06 CN CN 201220452835 patent/CN202873032U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205142150U (en) | Power amplifier circuit and amplifier device | |
| CN204090123U (en) | Audio output control circuit and audio-frequence player device | |
| CN204190934U (en) | The voicefrequency circuit that a kind of power output is adjustable on a large scale and acoustic product | |
| CN102945010B (en) | Method and device for realizing automatic switching of sound source | |
| CN203537555U (en) | Audio device | |
| CN102802062A (en) | Set-top box and switching power supply circuit thereof | |
| CN101931369B (en) | Bridge output power supply voltage adaptive variable audio power amplifier | |
| CN212305299U (en) | Communication level conversion circuit | |
| CN203675057U (en) | Audio power amplifier of integrated boosted circuit | |
| CN103592989A (en) | Low quiescent dissipation rapid transient response non-output capacitance LDO (low drop out regulator) circuit | |
| CN103713679B (en) | A kind of LDO circuit based on discrete component | |
| CN202873032U (en) | Sound source adaptive control system | |
| CN205725668U (en) | Numeral amplitude-frequency balancing powder amplifier | |
| CN205265633U (en) | Anti interfering signal magnification system | |
| CN105450191A (en) | Dual-line silicon microphone amplifier | |
| CN103841492A (en) | Output method of audio signal and apparatus | |
| CN205051656U (en) | Microphone amplification circuit | |
| CN202043081U (en) | Gain adjustable amplifying circuit | |
| CN204810526U (en) | 2. 1 digital sound system of sound channel based on switching power supply and D class power amplifier | |
| CN203563186U (en) | Noise reduction circuit and voice audio driving circuit provided with same | |
| CN102098017B (en) | Volume control circuit and device as well as multimedia equipment | |
| CN202721728U (en) | Mobile phone and audio amplification output circuit thereof | |
| CN202077000U (en) | Audio frequency power amplifier automatic switching circuit and power amplifier chip | |
| CN104300926A (en) | Audio power amplifier used for multimedia electronic equipment | |
| US11798978B2 (en) | On-chip inductor with audio headphone amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20160906 |