This report describes two low data rate VFR coding schemes of spectral information based on contour quantization. The first is a basic coding scheme in which speech signal is first pre-segmented into phone-like sub-segments. The second one is an optimal coding scheme in which a joint optimization procedure for segmentation, quantization and codebook design is employed in the encoder to iteratively improve the coding efficiency to reach a lower bound of rate-distortion function. A complete vocoder to further consider the encoding of pitch and gain information is also discussed.
|Number of pages||8|
|Journal||Journal of the Chinese Institute of Electrical Engineering, Transactions of the Chinese Institute of Engineers, Series E/Chung KuoTien Chi Kung Chieng Hsueh K'an|
|State||Published - 1 May 1995|