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Voice compressing method for quasi-periodical waveform

A quasi-periodic, compression method technology, applied in speech analysis, speech synthesis, instruments, etc., can solve problems such as difficult to achieve and low computational load

Inactive Publication Date: 2003-03-19
INVENTEC BESTA CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In the case of constant signal bandwidth, if more data is to be transmitted, the compression rate must be higher. It is difficult to achieve the goal of high quality, low computation and bit rate less than 24kbps with ADPCM and LPC.

Method used

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  • Voice compressing method for quasi-periodical waveform
  • Voice compressing method for quasi-periodical waveform
  • Voice compressing method for quasi-periodical waveform

Examples

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Embodiment Construction

[0046] The present invention discloses a quasi-periodic waveform speech compression method, which is to take a cycle representative in a quasi-periodic speech waveform, and other cycles are generated by duplicating, and only the change of the amplitude and the tiny cycle are recorded Changes to achieve the purpose of compression. in, figure 1 It is a speech coding flow chart of the quasi-periodic waveform of the present invention.

[0047] At first, input speech x (step 100), set Duplicate minimum value D_min (step 102), set error boundary value (Distortion Threshold) Dist Thrd (step 104), make coded speech length Ms=0 (step 106), Make Duplicate=0 (step 108), and get a section of about 20-25ms speech sound frame length M (step 110) from x (Ms) point, utilize absolute amplitude difference function (Absolute Magnitude Difference Function; AMDF) again, find The cycle length P (step 120) represented, wherein: AMDF ( k ) ...

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Abstract

In the voice compression of quasi-periodical waveform, one representative period is taken and the other periods are generated via duplication, and only the change in amplitude and miniature period change are recorded to reach the aim of compression. The deression may be performed in a Z80 microprocessor and the playback may be performed with only simple DAC and no DSP and speech synthesizer. The present invention is suitable for application in not-expensive true voice product.

Description

technical field [0001] The invention relates to a speech compression method, in particular to a quasi-periodic waveform speech compression method. Background technique [0002] Speech compression is to represent the original signal with the least amount of digital data in the audio signal. The amount of data determines the quality of the restoration. For example, the adaptive delta pulse code modulation (Adaptive Delta Pulse Code Modulation; ADPCM) coding method in speech waveform coding, so that the reconstructed signal and the original signal waveform are as good as possible. From a mathematical point of view, it is the minimum The minimum mean square error criterion (Minimum Mean Square Error Criterion), but the bit rate is less than 24kbps (Kilo Bit Per Second) ADPCM method, either the sound quality is deteriorated, or the amount of calculation is increased. For example, Linear Prediction Coding (LPC) in speech parameter coding is based on the speech sound model, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L13/00G10L19/02
Inventor 杨凰琳
Owner INVENTEC BESTA CO LTD
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