DocumentCode :
1749426
Title :
Near-optimal selection of encoding parameters for audio coding
Author :
Aggarwal, Ashish ; Regunathan, Shankar L. ; Rose, Kenneth
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Volume :
5
fYear :
2001
fDate :
2001
Firstpage :
3269
Abstract :
We address the issue of optimizing side information rate for efficient audio coding. In coders such as the MPEG-4 AAC, at rates around 16 kbps to 48 kbps, the side information rate forms a substantial part of the total rate. The parameter search procedure in the verification model optimizes each band separately and results in poor performance at low rates. We propose to jointly optimize the encoding parameter of all the bands. The near-optimal solution using a brute force search has drastic computational complexity. However, the same solution is obtained at a much reduced complexity using a Viterbi search through a trellis. The search procedure is developed and evaluated for two objective measures, the average and the maximum noise-mask ratio. For both the measures, the trellis-based search yields substantially better solutions. In particular, trellis-based optimization of maximum noise-mask ratio greatly improves the performance of AAC at low rates. The resulting bit stream is standard-compatible, and the additional complexity due to the proposed optimization is only incurred at the encoder
Keywords :
audio coding; code standards; optimisation; search problems; MPEG-4 AAC; Viterbi search; audio coding; computational complexity; encoding parameters; optimization; trellis-based search; Audio coding; Bit rate; Decoding; Encoding; Information rates; MPEG 4 Standard; Noise measurement; Signal to noise ratio; Virtual manufacturing; Viterbi algorithm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
ISSN :
1520-6149
Print_ISBN :
0-7803-7041-4
Type :
conf
DOI :
10.1109/ICASSP.2001.940356
Filename :
940356
Link To Document :
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