CN103633959A - Intelligent automatic audio frequency control system - Google Patents
Intelligent automatic audio frequency control system Download PDFInfo
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- CN103633959A CN103633959A CN201310646568.6A CN201310646568A CN103633959A CN 103633959 A CN103633959 A CN 103633959A CN 201310646568 A CN201310646568 A CN 201310646568A CN 103633959 A CN103633959 A CN 103633959A
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- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
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Abstract
The invention discloses an intelligent automatic audio frequency control system. The intelligent automatic audio frequency control system comprises an audio frequency signal inputting module, a pre-amplifier, an automatic level control module, an audio frequency signal acquirer, a digital signal processor, a voltage converter and a PC (personal computer), wherein the audio frequency signal inputting module is sequentially connected with the pre-amplifier, the automatic level control module, the audio frequency signal acquirer, the digital signal processor, the voltage converter and the PC; and the automatic level control module comprises an inputting signal (a), a voltage comparator, a control voltage generator, a controllable gain amplifier, a level detector, a low-pass filter, a direct-current amplifier and an output signal (b). The automatic level control module in the intelligent automatic audio frequency control system can track and monitor the level of audio frequency signals outputted by the pre-amplifier at any time; and the intelligent automatic audio frequency control system is high in reliability, free of distortion and balanced in frequency.
Description
Technical field
The invention belongs to audio process apparatus field, particularly a kind of intelligent audio automatic control system.
Background technology
In audio system, voice signal amplifies by power amplifier, then drives loud speaker or earphone; When the dynamic range of voice signal is larger, just necessarily require the system can be enough sensitive to small signal, make the loud speaker can clear recognition reaction; Necessarily require again it to larger signal reaction appropriateness, to make the output of loud speaker be unlikely to distortion.The former has enough large gain by required power amplifier, tiny signal is amplified to the degree that can drive loud speaker; The gain of the latter's required power amplifier is enough low, compared with large-signal its amplitude after amplifying, can not surpass saturation voltage.
Therefore, suddenly big or suddenly small for audio signal, will cause the audio distortion of output, audio delivery weak effect.
Summary of the invention
The object of the present invention is to provide that a kind of reliability is high, undistorted, the intelligent audio automatic control system of frequency equilibrium.
The technical solution that realizes the object of the invention is: a kind of intelligent audio automatic control system, comprises audio signal input module, preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC; Described audio signal input module connects preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC successively; Wherein automatic electric-level control module comprises input signal a, voltage comparator, control voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier and output signal b, described input signal a connects successively voltage comparator, controls voltage generator, controllable gain amplifier, controllable gain amplifier is connected with output signal b, meanwhile, controllable gain amplifier connects level detector, low pass filter, direct current amplifier, voltage comparator successively.
The present invention compared with prior art, its remarkable advantage is: in intelligent audio automatic control system of the present invention, the audio signal level of preamplifier output can be followed the tracks of, be monitored to automatic electric-level control module at any time, when input signal increases, automatic electric-level control module reduces the gain of preamplifier automatically; When input signal reduces, automatic electric-level control module increases the gain of preamplifier automatically, so that enter the signal of A/D, remain on optimizing level, thereby guaranteed the invention provides, a kind of reliability is high, undistorted, the intelligent audio automatic control system of frequency equilibrium.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of intelligent audio automatic control system of the present invention.
Fig. 2 is the structural representation of automatic electric-level control module in intelligent audio automatic control system of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, a kind of intelligent audio automatic control system of the present invention, comprises audio signal input module, preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC; Described audio signal input module connects preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC successively; Wherein automatic electric-level control module comprises voltage comparator, controls voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier, and described voltage comparator, control voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier connect successively.
Described electric pressure converter is connected with PC by RS-232 or RS-485.
Described audio signal input module comprises microphone input unit and LINE IN input unit.
Described audio signal sample device adopts TLV320AIC23 audio chip.
Described digital signal processor adopts TI Company DSP chip TMS320VC5402.All the other modules are existing hardware module.
In conjunction with embodiment below, intelligent audio automatic control system of the present invention is further described:
A kind of intelligent audio automatic control system of the present invention, comprises audio signal input module, preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC; Described audio signal input module connects preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC successively; Wherein automatic electric-level control module comprises input signal a, voltage comparator, control voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier and output signal b, described input signal a connects successively voltage comparator, controls voltage generator, controllable gain amplifier, controllable gain amplifier is connected with output signal b, meanwhile, controllable gain amplifier connects level detector, low pass filter, direct current amplifier, voltage comparator successively.
Described electric pressure converter is connected with PC by RS-232 or RS-485.
Described audio signal input module comprises microphone input unit and LINE IN input unit.
Described audio signal sample device adopts TLV320AIC23 audio chip, a high-performance stereo audio A/D of Ta Shi TI company, D/A amplifying circuit, the analog-to-digital conversion of TLV320AIC23 audio chip and digital-to-analogue conversion component height are integrated in chip internal, have adopted advanced over-sampling technique; The external hardware interface of TLV320AIC23 audio chip is divided into simulation mouth and numeral mouthful.Simulation mouth is used for input and output audio signal, supports circuit input and microphone to input; Have two groups of digital interfaces, the first by
, the digital control interface that forms of SDIN, SCLK and MODE; TLV320AIC23 audio chip is a programmable audio chip, and by the digital control mouthful register that the control word of chip is write to TLV320AIC23 audio chip inside, as sample rate setting, working method arranges etc., has 12 registers; Audio frequency control mouth is mainly realized by multichannel buffer serial port McBSP1 with communicating by letter of DSP.
Described digital signal processor adopts TI Company DSP chip TMS320VC5402, and TMS320VC5402 has 6 unique bus Harvard structures, can work by 6 streamlines simultaneously, and operating frequency reaches 100MHz; Utilize 2 multichannel buffer serial ports (McBSP0 and McBSP1) of VC5402 to realize the seamless link with AIC23.The serial port of the multichannel band buffering of VC5402 has added the buffering area of a 2K on the basis of standard serial port.When each serial ports sends data, CPU sends the data that send in buffering automatically; And when receiving data, CPU writes reception buffer memory by the data of receiving automatically.Under automatic buffer mode, do not need word of every transmission just to send out once and interrupt, but the border of per pass buffer, just generation is interrupted to CPU, thereby reduce, frequently interrupts the impact on CPU.
In intelligent audio automatic control system of the present invention, the audio signal level of preamplifier output can be followed the tracks of, be monitored to automatic electric-level control module at any time, and when input signal increases, automatic electric-level control module reduces the gain of preamplifier automatically; When input signal reduces, automatic electric-level control module increases the gain of preamplifier automatically, so that enter the signal of A/D, remains on optimizing level, thereby has guaranteed that the present invention has that reliability is high, undistorted, the feature of frequency equilibrium.
Claims (5)
1. an intelligent audio automatic control system, is characterized in that, comprises audio signal input module, preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC; Described audio signal input module connects preamplifier, automatic electric-level control module, audio signal sample device, digital signal processor, electric pressure converter and PC successively; Wherein automatic electric-level control module comprises voltage comparator, controls voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier, and described voltage comparator, control voltage generator, controllable gain amplifier, level detector, low pass filter, direct current amplifier connect successively.
2. according to a kind of intelligent audio automatic control system described in claim, it is characterized in that, described electric pressure converter is connected with PC by RS-232 or RS-485.
3. according to a kind of intelligent audio automatic control system described in claim, it is characterized in that, described audio signal input module comprises microphone input unit and LINE IN input unit.
4. according to a kind of intelligent audio automatic control system described in claim, it is characterized in that, described audio signal sample device adopts TLV320AIC23 audio chip.
5. according to a kind of intelligent audio automatic control system described in claim, it is characterized in that, described digital signal processor adopts TI Company DSP chip TMS320VC5402.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646568.6A CN103633959A (en) | 2013-12-04 | 2013-12-04 | Intelligent automatic audio frequency control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310646568.6A CN103633959A (en) | 2013-12-04 | 2013-12-04 | Intelligent automatic audio frequency control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信***（广州）有限公司 | Power amplifier protection system based on ALC |
| CN103926962A (en) * | 2014-04-29 | 2014-07-16 | 尚斌 | Control method for controlling voltage output through voice frequency |
| CN104639915A (en) * | 2015-03-02 | 2015-05-20 | 成都中远信电子科技有限公司 | Automatic gain adjustment system of high-definition image intensifier |
| CN105790781A (en) * | 2016-01-22 | 2016-07-20 | 蔡婷婷 | Feedback control method of communication receiver |
| CN106448189A (en) * | 2016-11-02 | 2017-02-22 | 南京慧尔视智能科技有限公司 | Multilane speed measuring and block port triggering method and device based on microwaves |
-
2013
- 2013-12-04 CN CN201310646568.6A patent/CN103633959A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信***（广州）有限公司 | Power amplifier protection system based on ALC |
| CN103888088B (en) * | 2014-03-20 | 2017-03-08 | 京信通信***（广州）有限公司 | Power amplifier protection system based on ALC |
| CN103926962A (en) * | 2014-04-29 | 2014-07-16 | 尚斌 | Control method for controlling voltage output through voice frequency |
| CN104639915A (en) * | 2015-03-02 | 2015-05-20 | 成都中远信电子科技有限公司 | Automatic gain adjustment system of high-definition image intensifier |
| CN105790781A (en) * | 2016-01-22 | 2016-07-20 | 蔡婷婷 | Feedback control method of communication receiver |
| CN106448189A (en) * | 2016-11-02 | 2017-02-22 | 南京慧尔视智能科技有限公司 | Multilane speed measuring and block port triggering method and device based on microwaves |
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Application publication date: 20140312 |