A audio signal automatic gain control method, control equipment and storage medium
An automatic gain control, audio signal technology, applied in the field of signal processing, can solve the problems of long statistical time, unbalanced voice signal, slow response speed, etc., to achieve the effect of improving quality
Active Publication Date: 2021-08-31
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology
Using the automatic gain control (AGC, Automatic Gain Control) algorithm to process the audio signal can keep the level of the output end or the receiving end within a certain range, solve the problem of unbalanced voice signal transmission on the network, and obtain higher quality voice ;However, in order to ensure the reliability of the statistics and avoid the undue interference of sudden abnormal signals on the statistics, it is necessary to accumulate a certain amount of samples before making statistics. Usually, the cycle is tens of milliseconds or even hundreds of milliseconds. The statistical time is longer and the response speed is faster. slower
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0025] At present, there are many methods for adjusting the gain of the voice signal, for example, the first method: set the high and low thresholds of the short-term energy of the voice and the high and low thresholds of the zero-crossing rate, calculate the short-term energy and zero-crossing rate of the input signal, and combine them Compare with the preset threshold respectively, so as to choose to increase the gain, decrease the gain or keep the current ga...
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The present application discloses an audio signal automatic gain control method, a control device, and a storage medium. The audio signal automatic gain control method includes counting the energy of the input audio signal, and calculating the initial value corresponding to the input audio signal according to the energy of the input audio signal. The gain coefficient is corrected once to obtain the intermediate gain coefficient of the input audio signal; the intermediate gain coefficient is modified twice to obtain the final gain coefficient; and the output signal is obtained according to the input audio signal and the final gain coefficient. Through the above method, the present application can dynamically adjust the gain coefficient, quickly track the fluctuation of the audio signal, and improve the quality of the output signal.
Description
technical field [0001] The present application relates to the technical field of signal processing, in particular to an audio signal automatic gain control method, a control device and a storage medium. Background technique [0002] Digital signal processing technology has been widely used in various fields of people's life. In online voice chat, due to the low precision of the equipment for sampling the voice signal, the poor quality of the microphone, and the distance between the two sides of the call and the microphone Due to the influence of recent factors, the use of the network to transmit voice signals may cause the voice to fluctuate. In severe cases, it may affect the communication between the two parties. [0003] In practical applications, for the conditions under which the volume should be increased or decreased, the general approach is to use silence detection; once it is detected as silence or noise, it will not be processed, otherwise, it will be processed usi...
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IPC IPC(8): G10L21/034H03G3/30
CPCG10L21/034H03G3/3005
Inventor 陈烈黄景标
Owner ZHEJIANG DAHUA TECH CO LTD