Filter -based filter reference reference to the projection symbol active control method

Abstract

The present invention discloses an active control method for filtering reference affine projection symbols based on variable step size, comprising: S1. collecting impulse noise signals, and transmitting the impulse noise signals to a control filter; S2. the control filter converting the The impulse noise signal is passed to the post filter; S3. the post filter generates a cancellation signal of the impulse noise signal according to the impulse noise signal and an internal active control algorithm, and transmits the cancellation signal to the speaker; S4 . The loudspeaker sends out the canceling signal, and the canceling signal is superimposed on the impulse noise signal to cancel the impulse noise signal. The present invention introduces a convex combination structure and a variable step size strategy, by adjusting the step size coefficient in the control filter structure, controlling the convergence speed of the algorithm, coordinating the contradiction between the convergence speed and steady-state error, and improving the convergence of the control algorithm to impulse noise performance, to achieve the purpose of effectively controlling impulse noise.

Description

technical field [0001] The invention belongs to the field of noise active control, in particular to an active control method for filtering reference affine projection symbols based on variable step size. Background technique [0002] In the real environment, the impulsive noise which obeys the non-Gaussian distribution widely exists. In the environment with impulsive noise, the performance of traditional adaptive algorithms based on second-order moment theory declines or even deteriorates. With the application of noise active control technology and the development of noise active control algorithm, affine projection sign algorithm based on 1-norm is produced, which can effectively control impulse noise by combining affine projection algorithm and sign algorithm Algorithm Performance in Impulse Noise Environments. The filtering reference affine projection sign active control algorithm considering the post-filter not only considers the secondary path in the actual noise cont...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problem that the use of fixed step size in the active control algorithm of filter reference affine projection symbols after considering the filter hinders the further improvement of algorithm convergence performance, and provides a filter reference affine projection symbol based on variable step size The active control method, while ensuring the stability of the control method, improves the convergence performance in the impulse noise environment and effectively reduces the impulse noise

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