Linear predictive coding (LPC) residual is an important component for analysis-by-synthesis speechcoders. Using spectral envelope vector quantisation (SEVQ) for LPC residual signals, mpeg-4 harmonic vector excitation...
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Linear predictive coding (LPC) residual is an important component for analysis-by-synthesis speechcoders. Using spectral envelope vector quantisation (SEVQ) for LPC residual signals, mpeg-4 harmonic vector excitation coding (hvxc) speechcoder is able to change the tone and speed for decoding bitstreams. A modified version is proposed to the simplified hearing-based SEVQ (SSEVQ) approach proposed by Wang and Yang. In addition, the energy first search scheme for SEVQ (EFSEVQ) is proposed in order to reduce the computational complexity of SEVQ for mpeg-4 hvxc speech coder. The proposed EFSEVQ scheme also agrees with human hearing properties. Simulation results reveal that the proposed EFSEVQ search scheme not only reduces the computational complexity but also preserves the quality of encoded speech.
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