A method of decoding in layers data received in a communication system, comprising receiving a codeword containing a plurality of elements and translating the plurality of elements into probability values by dividing the rows of at least one column of a parity check matrix associated with the codeword into groups and processing at least some of the groups separately. When a playback image signal DVr is supplied from a control unit, the synchronizing signal generator is self-driven. An opening in the bore extends at least substantially circumferentially around the bore. The conflict engine is configured to compare information that is at least derived from the lead with information stored in the vendor duplicates database in order to determine if the lead is a duplicate lead for the vendor such that the system can prevent transmission of duplicate leads to the vendor. Correlated double sampling is performed within each pixel such that the reset voltage and the integration voltage are sampled and stored within the pixel until the voltages are forwarded to a differential amplifier for subtraction.