Variable-step-size hearing aid adaptive echo cancellation device and echo cancellation method

Abstract

The invention discloses a variable-step-size hearing aid adaptive echo cancellation device and echo cancellation method, and the device comprises a single-frequency sound detector, a step size controller, and an adaptive filter. The single-frequency sound detector is used for carrying out the spectrum energy analysis of an error signal sample, calculating a current hearing aid system state parameter, and transmitting the parameters to a step length controller; the step length controller is used for judging the state of the system according to the system state parameter obtained from the single-frequency sound detector and the normalization error mean value, calculating a time-varying step length parameter of the adaptive filter, and transmitting the time-varying step length parameter to the adaptive filter; and the adaptive filter is used for filtering the cached far-end signal sample of the loudspeaker, calculating an estimated echo signal and outputting the estimated echo signal, anditeratively updating the adaptive filter according to the time-varying step parameter calculated by the step controller. The device and method solve the problems that an adaptive filter is low in convergence rate and too high in algorithm complexity and is difficult to realize in the prior art, and are suitable for a digital hearing aid system.

Description

technical field [0001] The invention relates to an adaptive echo canceling device and an echo canceling method of a hearing aid with variable step length. Background technique [0002] In recent years, with the development of industrialization and the aggravation of aging, the number of people suffering from hearing loss has continued to increase. It is the most common and quickest auxiliary means to choose hearing aids to improve hearing loss. However, the structural and functional characteristics of hearing aids are very easy to amplify the echo and produce howling. Therefore, the echo cancellation algorithm is one of the key algorithms of the digital hearing aid. It estimates the echo by estimating the characteristic parameters of the echo path and using the far-end signal of the speaker as a reference. signal, and then estimate the echo signal based on the received near-end microphone signal. Since the echo path is usually unknown and time-varying, especially during the...

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Problems solved by technology

[0006] In view of the above problems, the present invention provides a variable step-size hearing aid adaptive echo cancellation device and an echo cancellation method, which solves the problems in the prior art that the convergence speed of the adaptive filter is slow and the algorithm complexity is too high to be realized; further , to solve the problems existing in the prior art such as the large steady-state error of the adaptive filter, double-ended sounding, and parameter imbalance caused by related data

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