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Method of reducing storage space via altering the voice speed of similar data

A technology for storage space and similar data, applied in speech analysis, speech synthesis, instruments, etc., can solve the problems of heavy workload and high cost, and achieve the effect of reducing storage space and facilitating multi-level sound speed

Inactive Publication Date: 2003-03-19
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for the LPC and MELP methods, the compressed digital voice needs to be repaired by experienced personnel, and the repeated workload is huge and the cost is high.

Method used

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  • Method of reducing storage space via altering the voice speed of similar data
  • Method of reducing storage space via altering the voice speed of similar data
  • Method of reducing storage space via altering the voice speed of similar data

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Experimental program
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Embodiment Construction

[0032] The present invention is described by taking the MSP50C30 chip as an example, and the method can be used for all voice chips of the MSP50C3X series.

[0033] Due to the short-term nature of speech signals, various characteristics of speech remain stable within a short period of time. It shows that the shape of the vocal tract changes slowly, which can be regarded as a linear non-time-varying filter model; the excitation input maintains a periodic pulse sequence in a short period of time, and maintains a white noise sequence in another short period of time. For short periods of time it is a mix of both. In order to facilitate speech processing, the long-sequence speech signal can be divided into short-term speech sequences according to this characteristic, and this short sequence is called a frame. A frame includes various parameters that can completely describe the speech, such as volume, pitch, repetition bit, filter K parameter, etc. Each frame is decoded and proces...

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PUM

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Abstract

During LPC and MELP voice synthesis, the voice chip timing proportional register is preset to perform programmable frequency division of clock and control the time of interframe calling. Before voice synthesis, the initial set value of the timing proportional register is altered and this is equal to altering the inserting time of interframe data to increase the periodical voices extract two frames. Or, during CELP voice synthesis, the voice chip is coded via frame-separating technology and the sampling point number of each subframe is altered to determine the time interval between subframes. Every 125 microsecond, the accumulating counting in sampling point is once interrupted until specified sampling points before the subframe is called.

Description

technical field [0001] The invention belongs to the application field of integrated circuits, in particular to a method for reducing storage space by changing the speed of sound of similar data. Background technique [0002] The voice chip MSP50C3X is currently widely used in the market. It can be used in various occasions that require voice, such as language learning machines, pronunciation dictionaries, pronunciation game machines, computer voice books, and voice smart toys. The user only needs to compress the voice to be recorded into a digital signal in LPC (Linear Predictive Coding), MELP (Mixed Excitation Linear Predictive) or CELP (Code Excited Linear Predictive) format, and then write it into ROM, EPROM or FLASH ROM, etc. The chip MSP50C3X is used to control the voice decompression and playback. Compared with other voice products currently on the market, its advantages are: digital compression storage, high compression rate, large storage space, and long playback ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L13/04
Inventor 彭崇梅
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI