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Automatic Gain Controller Control Method and Circuit for Voice Acquisition System
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A technology of automatic gain and voice collection, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems of frequent volume control changes, unfavorable, large digital modules, etc., to achieve simple and reliable digital logic, increase stability, reduce The effect of computing power
Inactive Publication Date: 2018-01-19
SHANDONG UNIV
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[0005] However, the existing automatic gain control (AGC) control logic adopts too complex algorithms when facing different sound environments, requires high computing power, and the digital modules are too large, which is not conducive to reducing costs in the integrated voice chip.
However, too simple control logic will lead to frequent changes in the volume control, which cannot provide a comfortable volume
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Embodiment 1
[0037] Such as figure 1 As shown, the main circuit of the present invention consists of a microphone MIC connected in series, a low noise amplifier LNA, a variable gain amplifier VGA, an automatic gain controller AGC, an analog-to-digital converter ADC, etc., and the automatic gain controller AGC is a digital circuit. The automatic gain controller AGC receives the digital signal of the analog-to-digital converter ADC, and through logical operation, outputs a gain control signal to the variable gain amplifier VGA, and the voice signal is changed from the microphone MIC into an analog electrical signal and enters the circuit, so The signal of the analog-to-digital converter ADC is the circuit output signal.
[0038] Provided below as figure 1 Under the shown circuit structure, the working logic of the automatic gain controller AGC. Start the system, and after receiving the setting information, combine the operations of s, a, b, c, and d to set figure 2 The block diagram of t...
Embodiment 2
[0059] Preferably, according to the present invention, the adjustment function of setting parameters and a parameter setting value suitable for common situations such as voice dialogue and voice with background music are provided, and a description of gain adjustment under this setting is also provided.
[0060] frame, detection period, the smaller the value, the faster the gain adjustment will be when encountering a sudden sound change.
[0061] AGC_HLD, gain increase wait length, adjust the amplification when speaking interval, the larger the value is, the longer the speaking interval is required to amplify.
[0062] upper_th, the upper threshold, the threshold for reducing the gain, the lower the value, the easier it is to reduce the gain.
[0063] upper_ratio, the percentage allowed to exceed the upper threshold in a frame frame, the smaller the value, the easier it is to reduce the gain.
[0064] lower_th, the lower threshold, the threshold for increasing the gain, the h...
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Abstract
The invention discloses an automatic gain controller control method of a voice acquisition system and a circuit thereof. Voice signals are converted into analog electric signals to enter a low noise amplifier via a microphone, and the noise amplifier processes the voice signals and then transmits the voice signals to a variable gain amplifier; an automatic gain controller receives digital signals of an analog-to-digital converter, gain control signals are outputted to the variable gain amplifier through set logic operation, the automatic gain controller performs envelope tracking and analysis on the digital signals through the analog-to-digital converter, gain is changed at voice intervals through contrast control of parameters when voice comes, and the gain of voice can be locked under the certain state; and the output signals of the analog-to-digital converter is circuit output signals. Digital logic is concise and reliable, easy to realize by directly using digital modules or hardware description language and convenient to integrate in a voice chip system so that cost is saved.
Description
technical field [0001] The invention relates to the field of audio communication, in particular to an automatic gain controller control method and circuit of a voice collection system. Background technique [0002] In the audio communication system, in order to have a longer collection range at the sound collection point, clearer voice, softer and moderate volume at the receiving point, or because the volume at the sound collection point cannot be determined, it will be used in the recording of general voice, music, etc. Automatic gain control circuit is adopted. In the circuit using automatic gain control AGC, the design of pure analog AGC control circuit is more complicated, the situation that can be handled is relatively simple, and it is not easy to integrate, so it is a better method to convert to digital signal and process it through digital signal algorithm. Corresponding changes can be made in response to various speech situations, and it is easy to integrate. [0...
Claims
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