In a stream demultiplexing device, a synchronous clock signal is supplied
to a header processing unit only when a header is being inputted and
processed in the header processing unit, and supplied to a payload
processing unit only when a payload is being inputted and processed in the
payload processing unit. By such cutting off the synchronous clock signal
supply to the header processing unit and the payload processing unit while
they are not active, power consumption in the stream demultiplexing device
is reduced.
