Codebook Design Considerations for Low Bit-rate Speech Coding Using Joint Segmentation-quantization

Efficient segment quantization of LSP parameters for very low bit speech coding

This paper presents a new segment quantization (SQ) method for LPC coefficients, which is based upon a new segmentation scheme. In order to design an efficient segment coder, a segmentation method using the self-similarity of LSP coefficients between several frames is employed. The segmentation is carried out by matching the input LSP frames with each segment in the codebook, and the codebook i...

Low Bit - Rate Speech Coding Using Joint Segmentation - Quantization

Ultra low bit-rate speech coding based on unit-selection with joint spectral-residual quantization: no transmission of any residual information

A recent trend in ultra low bit-rate speech coding is based on segment quantization by unit-selection principle using large continuous codebooks as a unit database. We show that use of such large unit databases allows speech to be reconstructed at the decoder by using the best unit’s residual itself (in the unit database), thereby obviating the need to transmit any side information about the re...

Speech spectrum representation and coding using multigrams with distance

The multigrams allow us to split a string of symbols into a stream of variable length sequences. The direct application of this method to vector-quantized speech spectra fails, we develop an extension of the method called modiied multi-grams or multigrams with distance. The algorithm for mod-iied multigram dictionary training as well as experimental results are presented. We found a signiicant ...

A 1200 bps speech coder with LSF matrix quantization

A new 1200 bps speech coder designed with a tree searched multistage matrix quantization scheme is proposed. To improve speech quality and reduce the average bit rate, we have developed a new residual multistage matrix quantization method with the joint design technique. The new joint design algorithm reduces the codebook training complexity. Other new techniques for improving the performance i...