Fixed-point Processing Optimization of MPEG Psychoacoustic Model-Ⅱ Algorithm for ASIC Implementation 


Vol. 29,  No. 11, pp. 1491-1497, Nov.  2004


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  Abstract

The psychoacoustic model in MPEG audio layer-Ⅲ (MP3) encoder is optimized for the fixed-point processing. The optimization process consists of determining the data word length of arithmetic unit and the algorithm for transcendental functions that are often used in the psychoacoustic model. In order to determine the data word length, we defined a statistical model expressing the relation between the fixed-point operation errors of the psychoacoustic model and the probability of alteration of the allocated bits doe to these errors. Based on the simulations using this model, we chose a 24-bit data path and constructed a 24-bit fixed-point MP3 encoder. Sound quality tests using the constructed fixed-point encoder showed a mean degradation of -0.2 on ITU-R5-point audio impairment scale.

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  Cite this article

[IEEE Style]

K. Lee, Y. Park, D. H. Youn, "Fixed-point Processing Optimization of MPEG Psychoacoustic Model-Ⅱ Algorithm for ASIC Implementation," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 11, pp. 1491-1497, 2004. DOI: .

[ACM Style]

Keun-Sup Lee, Young-Cheol Park, and Dae Hee Youn. 2004. Fixed-point Processing Optimization of MPEG Psychoacoustic Model-Ⅱ Algorithm for ASIC Implementation. The Journal of Korean Institute of Communications and Information Sciences, 29, 11, (2004), 1491-1497. DOI: .

[KICS Style]

Keun-Sup Lee, Young-Cheol Park, Dae Hee Youn, "Fixed-point Processing Optimization of MPEG Psychoacoustic Model-Ⅱ Algorithm for ASIC Implementation," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 11, pp. 1491-1497, 11. 2004.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880