Optimal wordlength determination of AC-3 decoding hardware based on fixed-point analysis and simulations of AC-3 algorithm

In this paper, we perform a fixed-point analysis for Dolby AC-3 audio decoding algorithm, and determine the suitable multiplier wordlength (say, N) satisfying the required sound quality. After that, based on the similar simulations, we try to reduce the accumulator wordlength from the usual (8+ 2N) to (g+N+r) where g is the wordlength for overflow guard bits and r is the wordlength for rounding with the condition r