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Multi-channel echo filtering method, filtering device and readable storage medium

A multi-channel, filtering technology, used in interconnection devices, telephone communications, two-way sound reinforcement telephone systems, etc., can solve problems such as non-uniqueness

Active Publication Date: 2020-09-29
ALLWINNER TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0006] 1) As shown in formula 1 and More than just proximal room pulses and related, and also related to the far room pulse and related, leading to the non-uniqueness of the solution

Method used

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  • Multi-channel echo filtering method, filtering device and readable storage medium
  • Multi-channel echo filtering method, filtering device and readable storage medium
  • Multi-channel echo filtering method, filtering device and readable storage medium

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Embodiment Construction

[0052] refer to figure 2 , figure 2 The figure shows a schematic diagram of the time delay of each point in the frame after resampling a frame of data. Suppose the initial sampling rate of the audio is fs, and the sampling rate after resampling is fs′, then the ratio after resampling is R=fs′ / fs, that is, when R>1, it means that the sampling rate after processing is expanded; on the contrary, when R where n∈[0,N-1]. Therefore, the delay can be divided into 4 categories. 201 means forward frame acquisition, and R>1, the delay of each point in the frame is positive and increasing, 202 means forward frame acquisition, and R1, the delay of each point in the frame is negative and increasing, 204 means backward frame acquisition, and R<1, the delay of each point in the frame is negative and decreasing.

[0053] with x m Represents the time-domain signal before resampling, X m Represents the frequency domain signal before resampling, Represents the resampled time-domain signal...

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Abstract

The invention provides a multi-channel echo filtering method, a filtering device and a readable storage medium. The method comprises steps of resampling through the first audio data and the second audio data; obtaining first time domain data and second time domain data; processing to obtain first inversion time domain data and second inversion time domain data; and then superposing and multiplyingthe MIDFT matrix and the DFT matrix, performing low-frequency phase processing on the first resampling time domain signal and the second resampling time domain signal which are obtained through calculation, finally filtering echo signals, and outputting sound signals after echo filtering. According to the decorrelation method for multiple channels based on resampling, the method is equivalent todelay processing before and after resampling, the correlation before and after signal processing is subjectively controlled through the resampling ratio, the problem based on delay accumulation can besolved through combination of the resampling ratios, and the problem of discontinuity between processing blocks can be solved through signal inversion.

Description

technical field [0001] The invention relates to the field of echo filtering, in particular to a multi-channel echo filtering method, filtering device and readable storage medium. Background technique [0002] In the application of voice communication or human-computer interaction, there is often the interference of echo. Moreover, with the continuous improvement of people's requirements for call quality and the continuous development of intelligent voice speakers, the echo cancellation algorithm (Acoustic EchoCancellation, AEC) has become a hot spot today. For example, in the human-computer interaction application of intelligent voice speakers, it is necessary to eliminate the interference of music through the AEC algorithm in a noisy music environment, so that the machine can accurately obtain the accurate information of the wake-up word, so as to wake up the speaker for the next interaction. [0003] In the early stage of the development of smart voice speakers, most devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216G10L2021/02082H04M9/082
Inventor 荣赶丁何颖洋
Owner ALLWINNER TECH CO LTD
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