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Variance-Based Transient Segment Detection Method of Audio Signal

An audio signal and detection method technology, which is applied in the audio field, can solve problems such as redundant detection, and achieve the effects of improving time resolution, simple algorithm, and reducing complexity

Inactive Publication Date: 2011-12-14
TIANJIN UNIV
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Problems solved by technology

However, the flat measure detection method will detect transient segments with relatively low energy, resulting in some redundant detection

Method used

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  • Variance-Based Transient Segment Detection Method of Audio Signal
  • Variance-Based Transient Segment Detection Method of Audio Signal
  • Variance-Based Transient Segment Detection Method of Audio Signal

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Embodiment Construction

[0023] Aiming at this kind of redundant detection, the present invention proposes a general framework for detecting audio signal transient segments based on variance. When the energy of the entire frame signal is low but the sample value fluctuates greatly, the variance of the entire frame signal is used to reduce redundant detection.

[0024] Transient phenomena and irregular structures of signals (such as signal waveform jumps, interruptions, fast oscillations, etc.) often carry most of the information of the signal, and signals containing such transient phenomena and irregular structures are generally called transients The signal, because the signal has a dual relationship between the frequency domain and the time domain, that is, the signal changes suddenly in the time domain, and becomes flat in the frequency spectrum. On the contrary, the signal is flat in the time domain, and the corresponding frequency spectrum is abrupt. According to the range of FM, FM can have a goo...

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Abstract

The present invention relates to audio technology. In order to provide a kind of audio signal detection method that can effectively reduce the redundant detection of low-energy transient segment, the technical solution adopted by the present invention is, the audio signal transient segment detection method based on variance, comprises the following steps: Step 1: input a segment Audio signal, the audio signal is divided into frames, the frame length is N, and the mean value and standard deviation of each frame are calculated respectively according to the sample mean value and standard deviation formula, and then compared with the threshold value to determine whether this frame is a pre-transient frame; The pre-transient frame is divided into short signals with a length of M; the transient / stable state of this frame is judged twice; the transient / stable state of the processed frame is judged, if it is a transient frame, and the time when the transient occurs is marked Location. The invention is mainly applied to audio signal testing.

Description

technical field [0001] The invention relates to audio technology, in particular to the detection direction of audio signal transient segments, and in particular to a variance-based audio signal transient segment detection method. Background technique [0002] In the current high-quality low-bit-rate audio coding, the coding algorithm generally adopts the block transformation processing method, and uses the windowing method to divide the continuous audio signal into audio data blocks, and performs time-frequency transformation and quantization coding on each audio data block, and then performs storage or transmission. The audio coding algorithm based on block transformation is beneficial to remove the redundancy of the signal and improve the compression ratio. However, pre-echo distortion has always been a difficult problem in block-based audio coding techniques. The root cause of the pre-echo distortion is the diffusion of quantization noise in the time domain due to insuf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L11/00G10L19/00G10L19/025
Inventor 张涛周延献张瑞生邢东亮
Owner TIANJIN UNIV
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