Method for detecting and eliminating pulse noise in digital audio signal

Abstract

The invention provides a method for detecting and removing pulse noise in a digital audio signal, which comprises the following steps: utilizing weighted difference vectors of adjacent signal samples in a certain neighbor in the signals to detect pulse number and determine detection thresholds of the noise pulse according to the estimation value of the change degree of the amplitude and frequency of the signal; utilizing the envelope based on the weighted difference vectors of the signal samples to evaluate the width of the noise pulse and establish an autoregressive model of the signal; according to the correlation of voice frequency signals, utilizing adjacent signal samples which are repaired or not contaminated to repair a signal section which is contaminated by the pulse noise and recover original signals. The invention has the advantages that a normal signal which is changed abruptly and the noise pulse can be separated, and the width of the pulse can be calculated; and meanwhile, by adopting the envelop which is formed by the weighted difference vectors of the signal, the position and the width of the noise pulse are detected, so that a single noise pulse, a plurality of contiguous noise pulses or a plurality of overlapping noise pulses can be processed.

Description

technical field [0001] The invention relates to a method for detecting and eliminating pulse noise in digital audio signals, which is used for detection and noise reduction of pulse noise in digital audio signals, and belongs to the technical field of detection and noise reduction methods for pulse noise in digital audio signals. Background technique [0002] Traditional audio data are mostly stored in tapes, records and other media in the form of analog signals. To preserve these materials for a long time, they need to be converted into digital signals. In the process of digitization, due to the aging, damage, defects, conversion equipment and other reasons of the storage medium, there are a lot of noises that affect the hearing in the converted digital audio signal. The process of reducing or eliminating these noises and restoring the original audio signal is called Audio noise reduction. [0003] Impulse noise, also known as click noise, is one of the main noises in aud...

AI Technical Summary

Problems solved by technology

The traditional pulse noise detection is mainly carried out by flipping the filter. This method is difficult to distinguish the sudden change signal in the normal signal, such as a sharp knocking sound, from the noise pulse, and cannot accurately estimate the noise width; the traditional Most of the impulse noise repair methods use the median filter, and its disadvantage is that it is difficult to obtain high-quality audio signal repair effects.

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