Title :
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
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;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1206033
