Audio signal processor

Digital audio data occurs in groups of data samples spaced apart in time. The data rate in the groups is much greater than the audio data sampling rate. The audio data may be embedded in the horizontal blanking interval of a video signal as in SDI. The audio data is extracted (2) from the video signal and the samples stored in a FIFO (3). The FIFO (3) removes the spacing between the groups of samples. Sets of the samples are weighted and summed in a multiplier (4) and accumulator (5). Each set to be weighted and summed is displaced by a preset number of samples relative to the previous set to decimate the audio data.