A novel MPEG audio degrouping algorithm and its architecture design

Degrouping is the key component in MPEG Layer II audio decoding. It mainly contains the arithmetic operations of division and modulo. In this paper, we propose a novel degrouping algorithm and its architecture design with a low-complexity design concept. By using the 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 keep high efficiency without any loss of accuracy.