Patent ID: 6788711
Filing Date: 2004-09-07
Classification: H04N

Abstract:
A demultiplexer which is sequentially input with packets in which specific individual data is stored in predetermined units and extracts the specific individual data from the input packets, each packet comprised of predetermined units of specific individual data and control data corresponding to a related specific individual data and/or a related packet,said demultiplexer comprising: a first comparing means for comparing the control data in an input packet and first comparison data corresponding to a first predetermined portion of related control data based on a mask bit corresponding to a composing bit of the related first comparison data, the first comparing means comparing portions corresponding to a mask bit having an unmasking value; a second comparing means for comparing the control data in an input packet and second comparison data corresponding to a second predetermined portion contained in the first predetermined portion of the related control data based on the first comparison data and the mask bit, the second comparing means comparing portions corresponding to a mask bit having a masking value and corresponding to composing bits having a first value; and an extracting means for extracting the predetermined units of the specific individual data from an input packet when a result of comparison of the first comparing means indicates coincidence and the result of comparison of the second comparing means indicates noncoincidence.