NDLI: A fast audio bit allocation technique based on a linear R-D model

Content Provider	IEEE Xplore Digital Library
Author	Chun-Yi Lee Yao-Chun Fang Hsiao-Chiang Chuang Chung-Neng Wang Tihao Chiang
Copyright Year	1975
Abstract	The MPEG-1 Layer III audio coding is most widespread digital audio format on the Internet. Its encoder is more complicated than the other layers in the MPEG-1 audio specification, where the bit allocation constitutes significant part of the total computational load. This paper describes a fast bit allocation technique using a novel linear model to compute the bitrate and the global gain of the inner loop (rate control loop) for the classic MP3 bit allocation problem. Estimated quantization noise is approximated with a binomial expansion for the adjustment of the scale-factors. This procedure reduces the outer loop iterations (distortion control loop) to one loop. Our bit allocation technique is about five times faster compared to the well-known LAME MP3 encoder. Based on the objective quality measure, total number of distorted bands, and average total noise-to-masking ratio (NMR), our experimental results show that there is significant improvement in speedup of the encoding process without noticeable audio quality degradation.
Sponsorship	IEEE Consumer Electronics Society
Starting Page	662
Ending Page	670
Page Count	9
File Size	865058
File Format	PDF
ISSN	00983063
Volume Number	48
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bit rate Digital audio players Audio coding Internet Quantization Distortion measurement Velocity measurement Noise measurement Signal to noise ratio Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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