A modified MPEG-2 audio decoding scheme based on its low-cost fast algorithm and efficient data scheduling

Degrouping is the key component in MPEG Layer II audio decoding. It mainly contains the arithmetic operations of division and modulo, which requires a great deal of hardware and computation time. In this paper, we propose a novel degrouping algorithm with a low complexity design concept. By using mode selection and iterative decomposition, only the addition and subtraction are needed. The elimination of the multiplier, divider and ROM table can therefore save a lot of chip area, but still retains the high efficiency without loss of any accuracy.