Patent ID: 8296629
Filing Date: 2012-10-23
Classification: H03M,H04H

Abstract:
1. An RDS compatible receiver comprising: a demodulator which demodulates RDS data included in a received broadcast wave and outputs demodulated RDS data; a register which converts the demodulated RDS data to block data and outputs the block data; an offset generating unit which is given a pattern match flag signal and a synchronization flag signal, predicts an offset word of the block data based on values of the pattern match flag signal and the synchronization flag signal, and outputs the predicted offset word; an error correction processing unit which is given the predicted offset word and the block data, performs error detection and error correction of the block data using the predicted offset word, counts the number of error corrections, compares the number of error corrections with a predetermined correction threshold, determines whether the predicted offset word is right or not based on the comparison result, and outputs the pattern match flag signal based on the determination result; a synchronization determining unit which is given the predicted offset word and the pattern match flag signal sequentially, detects whether or not the predicted offset word determined to be right matches a predetermined offset sequence pattern, determines whether RDS block synchronization is established or not based on the detection result, and outputs the synchronization flag signal based on the determination result; and a multiplexer which is given a first correction threshold, a second correction threshold that is greater than the first correction threshold, and the synchronization flag signal, selects one of the first correction threshold and the second correction threshold based on a value of the synchronization flag signal, and outputs the selected threshold to the error correction processing unit as the predetermined correction threshold.