Multistage audio transient-and-stable state determining method based on variance and time domain peak value

Abstract

A multistage audio transient-and-stable state determining method based on variance and time domain peak value comprises the steps of performing frame dividing on an original audio signal through using 1024 sampling points as a unit; calculating a mean value and the variance on each signal frame, comparing the variance with a preset variance threshold, setting the determining mark of the signal frame of which the variance is smaller than or equal with the variance threshold to one, and outputting a stable state frame mark; determining the signal frame of which the variance is larger than the variance threshold according to a peak value detecting algorithm; determining the determining result of the peak value detecting algorithm, if the determining mark is one, outputting the stable state frame mark, and if the determining mark is zero, outputting a transient state frame mark. The multistage audio transient-and-stable state determining method determines the transient-and-stable state of audio by means of the variance and the time domain peak value of the signal. The obtained transient-and-stable signal is used for adaptive window switching. Low complexity and high accuracy in determining the transient-and-stable state are realized. Lower time complexity is realized. Furthermore detection for the signal with relatively low energy can be prevented. Detecting accuracy is improved.

Description

technical field [0001] The invention relates to an audio transient steady state judgment method. In particular, it relates to a multi-level audio transient steady state judgment method based on variance and time domain peak value. Background technique [0002] Most of the existing audio coding standards are based on psychoacoustic models, using the masking effect of the human ear to compress and code the original audio signal, which is the so-called audio perceptual coding. Such as AC-3, AAC, MPEG-2 widely used in the world, and AVS and DRA with my country's independent intellectual property rights. In the current mainstream audio coding standards, the method of window function is generally used to process the signal. The signal is divided into data blocks one by one through the window function, and then each data block is processed separately. Through quantization and entropy coding, the final output bitstream. [0003] In block-based audio coding technology, pre-echo ha...

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Problems solved by technology

[0008] The current transient state judgment methods all have shortcomings: there will be more redundant judgments in the transient signal detection results based on perceptual entropy; secondly, its algorithm is complex and the coding efficiency is low; based on time-domain energy and frequency There is a problem that the higher-energy previous frame signal will affect the accurate detection of the next frame signal in the transient steady state judgment method of domain unpredictability, resulting in false detection

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