Frequency-convertible echo cancellation method based on near-end audio signal calibration and correction

Abstract

The invention discloses a frequency-convertible echo cancellation method based on near-end audio signal calibration and correction and relates to the technical field of audio and video processing. The frequency-convertible echo cancellation method based on the near-end audio signal calibration and correction is a near-end audio signal calibration and correction method and includes the first step of carrying out one-time calibration on the frequency conversion of a microphone of equipment and the frequency conversion of a loudspeaker of the equipment to generate a set of frequency correction parameters, and the second step of firstly carrying out one-time correction on collected audio signals through the utilization of the frequency correction parameters calibrated before, then allowing estimation echo audio signals generated from a self-adaptive filter module to be subtracted from the corrected audio signals and finally achieving the echo cancellation function. The frequency-convertible echo cancellation method based on the near-end audio signal calibration and correction is capable of well canceling echoes after the frequency conversion, simplifying the calculated amount of a self-adaptive filter, enabling the calculated amount of the self-adaptive filter to have better convergence, being suitable for processing the long echoes and reducing noises and constraint.

Description

technical field [0001] The invention relates to the technical field of audio and video processing, in particular to a method for eliminating frequency conversion echo based on near-end audio signal calibration and correction. Background technique [0002] Echo is a common problem with audio systems, and the echo originates from the local audio loopback. Local audio loopback occurs when your microphone picks up the audio signal from your speaker and sends it along with your voice to the person on the other end; the person on the other end hears an echo of their own voice as they speak . One of the easiest ways to completely eliminate echo is to use headphones. The headset sits close to the caller's ear and plays audio at a low volume, preventing the microphone from picking up the audio signal, but it's impossible to use a headset in an audio conferencing system. [0003] At present, there are many methods to solve the problem of echo cancellation. The most popular method i...

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Problems solved by technology

[0006] The present invention aims at the frequency deviation caused by the speaker equipment (caused by the deviation of the sound quality of the speaker), the frequency deviation caused when the speaker plays the remote audio signal and the microphone sampling, resulting in the estimation of the remote audio signal generated by the adaptive filter Echoing audio signals do not cancel well with echoes carried by near-end audio signals

In order to solve this kind of problem, a near-end audio signal calibration and correction method is proposed, and the frequency conversion of the microphone and speaker of the device is first calibrated and a set of frequency correction parameters is generated.

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