Improvements in or relating to processing digital signals

摘要

In an arrangement in which a plurality of bitstreams intended to be received by respective buffers are combined by a multiplexer, the order in which said bitstreams (eg video packet streams) are applied to the multiplexer is based on the computed extent to which contributions from each bit stream will occupy the intended receive buffers. As described the object is to prevent the receive buffers underflowing and overflowing. As shown counters 302 count data bytes and send size of picture data to corresponding decoder buffer models 303 to emulate occupancy of the corresponding actual decoder buffers.