Design of a low power psycho-acoustic model co-processor for MPEG-2/4 AAC LC stereo encoder

Author

Tsai, Tsung-Han ; Huang, Shih-Way ; Chen, Liang-Gee

Author_Institution

Dept. of Electr. Eng., Nat. Central Univ., Chung-li, Taiwan

Volume

2

fYear

2003

Abstract

A new design of psycho-acoustic model (PAM) in MPEG-2/4 AAC encoding is proposed. Differing from the conventional PC-based and DSP-based encoders, it was based on hybrid architectures. It was optimized at algorithmic and at architectural levels. At the algorithmic level, MDCT-based PAM and fixed-coefficients were used to replace the original FFT-based PAM and spreading functions. At the architectural level, the co-processor PAM design is proposed. The proposed design could be used in a real-time MPEG-2/4 AAC LC stereo encoder while maintaining CD quality below 30 MHz.

Keywords

audio coding; coprocessors; discrete cosine transforms; low-power electronics; network synthesis; 30 MHz; CD quality; LC stereo encoder; MDCT-based PAM; MPEG-2/4 AAC encoding; PAM fixed-coefficients; hybrid encoder architecture; low power co-processor; psycho-acoustic model co-processor; Algorithm design and analysis; Bit rate; Computational complexity; Coprocessors; Design engineering; Digital audio players; Encoding; Noise shaping; Psychoacoustic models; Psychology;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1206033

Filename

1206033