Title :
Dynamic Programming Based Optimum Non-Uniform Samples For Speech Reconstruction and Coding
Author :
Ghosh, Prasanta Kumar ; Sreenivas, T.V.
Author_Institution :
Dept. of Electr. Commun. Eng., Indian Inst. of Sci.
Abstract :
Non-uniform sampling of a signal is formulated as an optimization problem which minimizes the reconstruction signal error. Dynamic programming (DP) has been used to solve this problem efficiently for a finite duration signal. Further, the optimum samples are quantized to realize a speech coder. The quantizer and the DP based optimum search for non-uniform samples (DP-NUS) can be combined in a closed-loop manner, which provides distinct advantage over the open-loop formulation. The DP-NUS formulation provides a useful control over the trade-off between bitrate and performance (reconstruction error). It is shown that 5-10 dB SNR improvement is possible using DP-NUS compared to extrema sampling approach. In addition, the close-loop DP-NUS gives a 4-5 dB improvement in reconstruction error
Keywords :
dynamic programming; signal reconstruction; signal sampling; speech coding; SNR; dynamic programming; nonuniform signal sampling; reconstruction signal error; signal-to-noise ratio; speech coder; speech coding; speech reconstruction; Bit rate; Cost function; Dynamic programming; Interpolation; Quantization; Sampling methods; Signal analysis; Signal reconstruction; Speech analysis; Speech coding;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660247