Loading...
Please wait, while we are loading the content...
Similar Documents
The Switched Split Vector Quantiser and its Application to LPC Parameter Quantisation in Wideband Speech Coding
| Content Provider | CiteSeerX |
|---|---|
| Author | So, Stephen Paliwal, Kuldip K. |
| Abstract | Abstract — In this paper, we present an overview of the switched split vector quantiser (SSVQ), its advantages over the traditional split vector quantiser, and its application to LPC parameter quantisation in wideband speech coding. By utilising an unconstrained switch vector quantiser as an initial stage, the SSVQ is able to exploit global vector dependencies in order to compensate for rate-distortion (R-D) losses in the split vector quantiser, which are due to the structural constraints on the codebook. The resulting scheme is not only more efficient in the R-D sense, but also possesses lower computational complexity than the split vector quantiser. We apply the SSVQ to quantising line spectral frequency (LSF) parameters of wideband speech and compare its spectral distortion performance with the split vector quantiser (SVQ), PDF-optimised scalar quantiser, and the split-multistage vector quantiser (S-MSVQ) with MA predictor from the ITU-T G.222.2 AMR-WB speech coder. The results show that the SSVQ requires less bits for achieving transparent coding of wideband LSFs than SVQ and scalar quantisers. Finally, SSVQ (which is a memoryless scheme) achieves comparable spectral distortion with the S-MSVQ with MA predictor at 36 and 46 bits/frame. Index Terms — line spectral frequencies, LPC parameter coding, vector quantisers, wideband speech coding. I. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Lpc Parameter Quantisation Switched Split Vector Quantiser Split Vector Quantiser Wideband Speech Coding Wideband Speech Ma Predictor Wideband Lsfs Spectral Distortion Performance Global Vector Dependency Line Spectral Frequency Index Term Line Spectral Frequency Comparable Spectral Distortion Lpc Parameter Coding Traditional Split Vector Quantiser Amr-wb Speech Coder Speech Coding Transparent Coding Scalar Quantisers Pdf-optimised Scalar Quantiser Computational Complexity Resulting Scheme Initial Stage Vector Quantisers Split-multistage Vector Quantiser R-d Sense Structural Constraint Unconstrained Switch Vector Quantiser Memoryless Scheme Bit Frame |
| Content Type | Text |
