Two polyphase filter architectures for MPEG audio
Polyphase subband filtering is a computational-intensive operation in MPEG audio coding. In this paper, we present two fast architectures by using a fast IDCT algorithm with and without recursive formula for polyphase analysis subband filtering. Our basic approach is to use only one adder/subtracter and one multiplier, but each has its own data bus, and a process controller is used to control the overall processing. We compare our design by using timing constraints, memory size, circuit complexities, and the number of operations. Low cost adder/subtracters and multipliers in VLSI implementation can be designed for real-time applications.