NDLI: An efficient low complexity encoder for MPEG advanced audio coding

Content Provider	IEEE Xplore Digital Library
Author	Xiaopeng Hu Guiming He Xiaoping Zhou
Copyright Year	2006
Description	Author affiliation: Sch. of Comput., Wuhan Univ. (Xiaopeng Hu; Guiming He; Xiaoping Zhou)
Abstract	MPEG advanced audio coding (AAC) is the current state of the art in perceptual audio coding technology standardized by MPEG. Nevertheless the real-time constraint of reference software implementation for the AAC encoder provided by MPEG leads to a heavy computational bottleneck on today's portable devices. In this paper we review briefly the algorithms specified in the MPEG AAC standard and analyze the algorithmic performance. Then we carry out algorithm level optimizations in order to get a low complexity as well as high quality audio encoder that can be easily ported onto multiple platforms. In psychoacoustic model, a MDCT-based psychoacoustic analysis and block switching algorithm in time domain and a tonality detection measure are presented. Moreover, we employ improved pre-processing and adjustment of scale factor in quantization module. Experimental results show the optimized encoder can save about half of overall computational complexity. According to subject evaluation result, the perceptual audio quality of improved encoder is better than the AAC LC reference encoder
Starting Page	5
Ending Page	1505
File Size	2692060
Page Count	1501
File Format	PDF
ISBN	8955191294
DOI	10.1109/ICACT.2006.206269
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-02-20
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	ETRI
Subject Keyword	Audio coding Algorithm design and analysis Portable computers Performance analysis Psychoacoustic models Psychology Time domain analysis Time measurement Quantization Computational complexity Low complexity AAC Psychoacoustic model
Content Type	Text
Resource Type	Article

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