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A New 8～32 kb/s Wideband Embedded Variable Bit-Rate Speech Coding Algorithm

Maoshen Jia

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Abstract

A five layers wideband embedded variable bit-rate speech coding algorithm at 8～32kb/s was proposed in this paper based on algebraic code-excited linear prediction(ACELP) and transform coded excitation(TCX) speech coding techniques.The first three layers at 8kb/s,12kb/s and 16 kb/s are embedded by ACELP coding model,while the last two layers at 24 kb/s and 32 kb/s are embedded with TCX technique.The test result indicates that the quality of the embedded speech coding algorithm with five layers is close to Terms of Reference(TOR) for ITU-T G.VBR codec for clean speech,speech with office noise and switching between layers.

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What this paper is about

A five layers wideband embedded variable bit-rate speech coding algorithm at 8～32kb/s was proposed in this paper based on algebraic code-excited linear prediction(ACELP) and transform coded excitation(TCX) speech coding techniques.The first three layers at 8kb/s,12kb/s and 16 kb/s are embedded by ACELP coding model,while the last two layers at 24 kb/s and 32 kb/s are embedded with TCX technique.The test result indicates that the quality of the embedded speech coding algorithm with five layers is close to Terms of Reference(TOR) for ITU-T G.VBR codec for clean speech,speech with office noise and switching between layers.

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Available abstract

A five layers wideband embedded variable bit-rate speech coding algorithm at 8～32kb/s was proposed in this paper based on algebraic code-excited linear prediction(ACELP) and transform coded excitation(TCX) speech coding techniques.The first three layers at 8kb/s,12kb/s and 16 kb/s are embedded by ACELP coding model,while the last two layers at 24 kb/s and 32 kb/s are embedded with TCX technique.The test result indicates that the quality of the embedded speech coding algorithm with five layers is close to Terms of Reference(TOR) for ITU-T G.VBR codec for clean speech,speech with office noise and switching between layers.

Key concepts: Speech coding, Linear predictive coding, Computer science, Harmonic Vector Excitation Coding, Codec2, Full Rate, Speech recognition, Adaptive Multi-Rate audio codec

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