Patent ID: 7729466

Claim:
A near-instantaneously companded audio multiplex (NICAM) system, comprising: a NICAM deframer for receiving a strobe signal and a data signal, obtaining a plurality of deinterleaved symbols at each of a plurality of successive times according to the strobe signal and the data signal, and then expanding the deinterleaved symbols into a plurality of corresponding pulse code modulation (PCM) symbols; a first-in-first-out (FIFO) buffer for temporarily storing the deinterleaved symbols and the PCM symbols, and then sequentially outputting the PCM symbols at a local timing rate; and a symbol rate conversion (SRC) unit, which is coupled to the FIFO buffer and determines whether to enable a SRC function or not according to statuses of the symbols in the FIFO buffer every one constant time interval, wherein: the SRC unit outputs the PCM symbols at the local timing rate when the SRC function is disabled; and when the SRC function is enabled, the SRC unit interpolates the PCM symbols to obtain a plurality of new PCM symbols and outputs the new PCM symbols at the local timing rate.