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