Title :
Subband ADPCM coding for wideband audio signals using analysis-by-synthesis quantization scheme
Author :
Chu, M.T. ; Chan, C.F.
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong
Abstract :
Presents a subband coder based on an analysis-by-synthesis adaptive differential pulse code modulation (AS-ADPCM) algorithm for coding of high quality music signals at 110.25 kbps. The novelty of this scheme is that, during encoding, the ADPCM codeword is determined from a trained codebook by minimizing the mean square error between the original and decoded signals. Simulation results show that 4 dB improvement on SNR can be achieved by using the analysis-by-synthesis technique
Keywords :
acoustic signal processing; audio signals; encoding; linear predictive coding; music; pulse-code modulation; signal synthesis; vector quantisation; 110.25 kbit/s; ADPCM codeword; AS-ADPCM; MPELPC; adaptive differential pulse code modulation; algorithm; analysis-by-synthesis quantization; decoded signals; encoding; high quality music signals; listening tests; mean square error; multipulse excited linear coding; simulation results; subband ADPCM coding; trained codebook; transform domain; vector quantization; wideband audio signals; Algorithm design and analysis; Analytical models; Decoding; Encoding; Mean square error methods; Modulation coding; Multiple signal classification; Pulse modulation; Signal analysis; Wideband;
Conference_Titel :
Speech, Image Processing and Neural Networks, 1994. Proceedings, ISSIPNN '94., 1994 International Symposium on
Print_ISBN :
0-7803-1865-X
DOI :
10.1109/SIPNN.1994.344870
