Patent ID: 7633975
Filing Date: 2009-12-15
Classification: H04J

Abstract:
1. Synchronization circuitry for use in a receiver for receiving data in a form of frame including a plurality of blocks each having a block identity code, the data being employed in a mobile FM (Frequency Modulation) multiplex broadcasting system, said circuitry comprising: a storage device having a plurality of stages for storing the data and operative in response to a clock signal to shift the data stored stage by stage; a comparator for obtaining the data stored at predetermined one of the plurality of stages as target comparison data, and comparing the target comparison data with a reference block identity code to detect a block identity code; a block synchronizer for determining block synchronization based on the block identity code detected by said comparator; a frame synchronizer for determining frame synchronization based on the block identity code detected by said comparator; a switcher for selecting either received data or an output of last one of the plurality of stages, as input data which is input to first one of the plurality of stages; and a controller for generating a control signal which causes the received data to be the input data in a case of normal operation and causes the output of the last stage to be the input data in a case of test operation, and feeding the control signal to said switcher, said controller writing test data to said storage device in the case of test operation.