A Method of Dynamically Adjusting Echo Delay

Abstract

The invention provides a method for dynamically adjusting an echo time delay. The method comprises the following steps: obtaining an initial time-delay time T; setting a reference queue, taking multiple length-limited play data from played historical data according to the T, calculating a frequency spectrum, performing binarization on the frequency spectrum to obtain a play binary spectrum, storing the play binary spectrum in the reference queue in order, reading acquired data, and performing VAD detection; if a detection result is voice, calculating a frequency spectrum of the acquired data, and performing binarization on the frequency spectrum to obtain an acquired binary spectrum; calculating similarity between the acquired binary spectrum and the play binary spectrum in the reference queue to obtain a play binary spectrum having highest similarity, and, when the play data having the highest similarity meets a set condition, inputting position serial number information of the play binary spectrum in the queue into a filter, and calculating a play data position corresponding to an echo after filtering; and inputting the play data position into a PI controller, adjusting the time-delay time by the PI controller according to the play data position, adjusting a time-delay set value, and effectively eliminating the echo.

Description

Technical field [0001] The invention relates to a method for dynamically adjusting echo delay. Background technique [0002] In the teleconference system, the voice of oneself is collected by the microphone after being played by the other party, and the other party will return the voice without processing, and the local end will hear the voice that oneself said, that is, an echo will appear, which affects the call experience. The principle of the echo cancellation algorithm is to estimate the echo based on the played sound, and then subtract the echo from the collected signal. Adaptive filtering is a commonly used echo estimation algorithm, which can estimate the generated echo based on the input remote data. The difficulty of echo cancellation is to estimate the actual delay and obtain the delay accurately, so that the playback data can be read according to the delay to eliminate the echo. [0003] Since the acquisition equipment and playback equipment will have a certain delay,...

AI Technical Summary

Problems solved by technology

In practical applications, the delay of some smart devices is not constant, and the delay may change during the call. When the delay changes, the playback data cannot be accurately obtained according to the initial measured delay, and the Echo Echo Estimation by Adaptive Filtering

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