Polyphase filter architectures for MPEG audio using fast IDCT

We present a fast architecture by using a fast IDCT algorithm for polyphase analysis subband filtering, a computational-intensive operation in MPEG audio coding. Our basic approach is to use only one adder/subtractor and one multiplier, but each has its own data bus, and a process controller is used to control the overall processing. The bus width is found by finite wordlength simulation. Simulation results and summaries have shown that a low cost adder/subtractor and multiplier in VLSI implementation can be designed for real-time applications.