Design and VLSI Implementation for Psychoacoustic Model in MPEG-2/4 Advanced Audio Coding

Introduction

Ø AAC is implemented in portable electronic devices

lSmart mobile phones

lDigital cameras

lPDA

lDigital audio devices with audio playback (players) and recoding (recorders)

Features

Ø Psychoacoustic Model characters in MPEG encoding

lMasking curve is computed according to the frequency-masking properties of the human ear

lA set of masking thresholds is derived for each partition band

lTo determine the maximum energy acceptable for the quantization noise in each partition band

Experiment Results

Ø Overall architecture of Psychoacoustic Model

Ø The result of Psychoacoustic Model

lWe simulated the proposed design by Verilog with sampling rate 44100 Hz

lIt requires 36248 processing cycles per frame, and operates about the clock rate 2MHz to encode stereo channels in real-time

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