Low bit-rate CELP speech coder with low delay

Hayashi, Seiji; Suguimoto, Masahiro; Erinnoviar,

doi:10.1016/s0165-1684(98)00168-6

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2005

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“…We proposed low-bit-rate backward-prediction coders (LBBPCs) in previous papers, introducing optimal algorithms for determining excitation gains and codebooks of excitation signals [1][2][3]. The proposed 3.6 kbit/s LBBPCs attained low delay of 13.5 ms but could not eliminate nonnegligible noise from reconstructed speech.…”

Section: Introductionmentioning

confidence: 99%

Efficient two-stage vector quantization speech coder using wavelet coefficients of excitation signals

Hayashi

Suguimoto

Erinnoviar

2005

Acoust. Sci. & Tech.

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An improved backward prediction coder featuring two-stage vector quantization (VQ) of shape codevectors is presented. Efficient two-stage VQ is achieved using the wavelet coefficients of excitation signals; i.e., wavelet coefficients are calculated by applying a discrete wavelet transform to excitation signals, and the results are divided into an approximation group and a detail group. The data lengths of both approximation and detail coefficients are half that of conventional two-stage VQ systems. Simulation results show that the proposed coder achieves a better weighted signal-to-noise ratio (WSNR) than conventional coders and, in terms of reconstructed speech quality, ranks between the FS-1016 Code Excited Linear Prediction (CELP) coder and the Vector Sum Excited Linear Predictive Coding (VSELP) coder.

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Section: Introductionmentioning

confidence: 99%