Enhancement of MPEG-4 ALS lossless audio coding

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作者：
NTT Communication Science Laboratories, Atsugi-shi, 243-0198, Japan [1 ]
不详 [2 ]
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来源：
NTT Tech. Rev. | 2007年 / 12卷
关键词：
Audio signal processing - Motion Picture Experts Group standards;
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摘要：
Enhanced codec software that complies with the MPEG-4 Audio Lossless Coding (ALS) has been developed. To improve the compression performance, a new linear prediction analysis method for multichannel coding was devised. Moreover, to reduce the processing time, software implementation has been optimized by utilizing simplified algorithms and efficient instructions for parallel execution. The results of a comprehensive evaluation show that the new software yields a compressed file size that is 0.1 % smaller on average and an encoding speed that is as much as six times higher than that of the MPEG reference software. This software will be very useful in practice because the compressed bitstream remains compliant with the international standard.
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