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http://dx.doi.org/10.5909/JBE.2008.13.3.415

MPEG-4 Audio Decoding Technique using Integer Operations for Real-time Playback on Embedded Processor  

Cha, Kyung-Ae (School of Computer & Communication Engineering, Daegu University)
Publication Information
Journal of Broadcast Engineering / v.13, no.3, 2008 , pp. 415-418 More about this Journal
Abstract
Some embedded microprocessors do not have an FPU(Floating Point Unit) due to a circuit complexity and power consumption. The performance speed of MPEG-4 AAC decoder on this hardware environment would be slower than corresponding speed for playing back of the decoded results. Therefore, irritating and high-pitched noises are interleaved in the original the audio data. So, in order to play MPEG-4 AAC file on such PDA, a new algorithm that transforms floating-point arithmetic to one with integers, is needed. We have developed a transformation algorithm from floating-point operation to integer operation and implemented the PDA's AAC Player. We also show the efficiency of our proposed method with the experimental results.
Keywords
MPEG Audio; MPEG-4 AAC; Embedded processor; IMDCT;
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