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System and method for encrypting acoustic source of speech encoding for vector quantization

A vector quantization and speech coding technology, applied in the field of communication, can solve problems such as sound source distortion, achieve the effect of improving distortion and realizing simple and flexible

Active Publication Date: 2008-12-24
CHINA TELECOM CORP LTD
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Problems solved by technology

[0005] Since the use of vector encoding / decoding has a large change in the frequency spectrum of the original sound source, if the encryption is implemented by the ordinary spectrum change method, the sound source will be greatly distorted

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  • System and method for encrypting acoustic source of speech encoding for vector quantization
  • System and method for encrypting acoustic source of speech encoding for vector quantization
  • System and method for encrypting acoustic source of speech encoding for vector quantization

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Embodiment Construction

[0035] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0036] The core of the sound source encryption method for vector quantization speech coding proposed by the present invention includes: encrypting the original sound source through encryption parameters; performing vector quantization encoding on the encrypted sound source; performing vector quantization signal encoding on the vector quantization encoding result Decoding; performing local decryption of the vector quantization signal decoding result according to the encryption parameters; calculating the error of the two according to the received original sound source and the local decryption result; modifying the encryption parameters according to the error calculation result, and passing the modified The encryption parameter encrypts the original sound source received later.

[0037] The system em...

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Abstract

The invention discloses a system and method of sound source encryption of speech coding, which are applicable to vector quantization. The method comprises the steps that: an original sound source is encrypted through encrypting parameters; vector quantization coding is carried out to the sound source encrypted; vector quantization signal decoding is carried out to the result of the vector quantization coding; signal local decryption is carried out to the result of the vector quantization signal decoding according to the encrypting parameters; the error of the two is calculated according to the result of the original sound source and the result of local decryption received; the encrypting parameters are modified according to the error calculation results and the original sound source received later is encrypted according to the encrypting parameters modified. The system and method of the invention minimize distortion through the self-adaptive adjustment of the encryption matrix of source spectrum and effectively improve the distortion caused by encryption.

Description

technical field [0001] The invention relates to speech encryption and speech coding technology in the communication field, in particular to a sound source encryption system and method suitable for vector quantization speech coding. Background technique [0002] At present, the encryption method for the analog sound source mainly adopts spectrum disorder or scrambling to implement encryption. [0003] This encryption method is effective for conventional analog speech transmission or for speech coding systems using Pulse Code Modulation (PCM) quantization. However, for the parameter encoding method using vector quantization, since the spectrum of the original sound source will be greatly changed after vector quantization, the sound source encrypted by traditional spectrum disorder or scrambling cannot be correctly detected at the receiving end. decoding. [0004] Due to the low coding rate of the vector quantization speech coding method, it can save communication transmissio...

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Application Information

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IPC IPC(8): G10L19/00G09C1/00G10L19/038
Inventor 林衡华李宝荣杨维忠孙宇张琳峰王庆扬肖海林奕琳龙彪
Owner CHINA TELECOM CORP LTD
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