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Heterogeneous microphone automatic gain calibration method and system

A technology of automatic gain and calibration method, which is applied in speech analysis, instruments, etc., can solve problems such as signal acquisition differences, and achieve the effects of suppressing excessive distortion, ensuring accuracy, and avoiding signal distortion

Active Publication Date: 2017-04-05
深圳撒哈拉数据科技有限公司
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Problems solved by technology

[0007] (3) Due to the change of the distance between the microphone and the target sound source, the difference in signal acquisition is caused

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  • Heterogeneous microphone automatic gain calibration method and system
  • Heterogeneous microphone automatic gain calibration method and system
  • Heterogeneous microphone automatic gain calibration method and system

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Embodiment Construction

[0081] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0082] Such as figure 1 As shown, the present invention proposes a heterogeneous microphone automatic gain calibration method, comprising the following steps:

[0083] S10. Acquire a microphone signal, perform channel noise estimation on the signal, calculate a noise suppression control factor, and correct the signal to obtain a first target signal;

[0084] S20. Perform reverberation estimation on the first target signal, calculate a reverberation control factor, and correct the first target signal to obtain a second target signal;

[0085] S30. Perform gain control on the second target signal to obtain a third target signal.

[0086] Channel noise is characterized by stationarity, that is, the power spectral density of channel noise whose energy distribution changes with time remains unchanged. The present invent...

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Abstract

The invention provides a heterogeneous microphone automatic gain calibration method and system. The method comprises the following steps: acquiring a microphone signal, performing channel noise estimation on the signal, calculating a noise suppression control factor and correcting the signal to obtain a first target signal; performing reverberation estimation on the first target signal, calculating a reverberation control factor and correcting the first target signal to obtain a second target signal; and performing gain control on the second target signal to obtain a third target signal. The method and system can effectively suppress the channel noise without causing excessive distortion to the target signal, and repair the harmonic structure to avoid signal distortion, may adaptively estimate the reverberation time, ensure the accuracy of the reverberation suppression, accurately restore frequency band signals by calculating the amplitude gain in each frequency band, and avoids a defect that same-proportion expansion is achieved but the signal resolution in each band is not improved.

Description

technical field [0001] The invention relates to the field of noise control, in particular to a heterogeneous microphone automatic gain calibration method and system. Background technique [0002] The microphone voice acquisition system perceives the sound pressure signal through the sensor and converts it into a digital signal, so as to realize the purpose of collecting the sound signal in the environment. Different microphones have different sensitivities according to specific applications. For example, in some applications, there is a certain distance between the microphone and the sound source, and the microphone needs to have a high sensitivity to ensure that the signal is not lost. The adverse effect is that it will amplify the system noise; If the sensitivity of the microphone is reduced, the system noise will not be too large, but the target signal will also have the defect of loss. Different smart terminals will make a compromise between the two according to the cha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L25/18G10L25/21
Inventor 蔡钢林
Owner 深圳撒哈拉数据科技有限公司
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