Coefficient determination method and device

Abstract

Embodiments of the present application provide a method and device for determining a coefficient, the method includes: acquiring a first audio signal collected by a first microphone and a second audio signal output to a speaker. A target delay coefficient is determined according to the first transmission path from the speaker to the first microphone, where the target delay coefficient is the number of delayed audio sampling points. A third audio signal is determined from the first audio signal and the second audio signal. According to the target delay coefficient, delay processing is performed on the third audio signal to obtain a delayed signal. According to the target delay signal and the first audio signal, the filter coefficient of the filter is updated, and the third audio signal is filtered through the filter to obtain the first filtered signal. The speaker is controlled to play the first filtered signal, so as to implement noise reduction processing on the noise reduction earphone. By updating the filter coefficient of the feedback filter according to the target delay coefficient, the delay of the signal processing path can be effectively reduced.

Description

technical field [0001] The embodiments of the present application relate to the technical field of active noise reduction, and in particular, to a method and device for determining a coefficient. Background technique [0002] There are two methods of noise reduction, active noise reduction and passive noise reduction. The active noise reduction function is to generate reverse sound waves equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving the effect of noise reduction. [0003] Adaptive feedback active noise reduction is an implementation method of active noise reduction. In adaptive feedback active noise reduction, the adaptive feedback filter needs to output reverse sound waves to achieve noise reduction. In the processing process of the adaptive feedback filter The weight coefficient of the filter needs to be determined. When determining the filter weight coefficient in the related art, the weight coefficient of the fe...

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Problems solved by technology

[0004] However, the model coefficients of the secondary channel are usually of relatively high order, which will lead to a large amount of calculation to determine the weight coefficients of the feedback filter, thereby increasing the delay of the signal processing path

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