A fast MPEG-audio layer III algorithm for a 32-bit MCU

Author

Sakamoto, Tadashi ; Taruki, Maiko ; Hase, Tomohiro

Author_Institution

Syst. LSI Dev. Center, Mitsubishi Electr. Corp., Hyogo, Japan

Volume

45

Issue

3

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

986

Lastpage

993

Abstract

This paper describes a fast MP3 algorithm for a 32-bit microcontroller unit (MCU) with DRAM to realize a real-time MP3 software decoder. Effective methods of reducing the amount of operations by using the IMDCT coefficients´ symmetry and appropriate multiplication size, and storing data to use the DRAM effectively are proposed. As a result, the proposed methods make it possible to cut the processing speed requirement in half and a decoding time of approximately 20 msec per frame for joint stereo data with a sampling frequency of 44.1 kHz has been obtained, that is to say, real-time decoding can be realized

Keywords

DRAM chips; ISO standards; audio coding; code standards; decoding; discrete cosine transforms; microcontrollers; reduced instruction set computing; telecommunication standards; transform coding; 32 bit; 44.1 kHz; DRAM; IMDCT coefficients symmetry; ISO/IEC standard; MCU; RISC architecture; decoding time; fast MP3 algorithm; fast MPEG-audio layer III algorithm; joint stereo data; microcontroller unit; multiplication size; processing speed; real-time MP3 software decoder; real-time decoding; sampling frequency; Adaptive filters; Decoding; Digital audio players; Equations; Filter bank; Flowcharts; IEC standards; ISO standards; Random access memory; Software algorithms;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.793662

Filename

793662