AN APPARATUS AND METHOD FOR DETECTING FIELD SYNC SIGNALS IN A HIGH DEFINITION TELEVISION.

摘要

AN APPARATUS (200) FOR DETECTING A FIELD SYNC SIGNAL IN A HDTV INCLUDES A SIGN BIT SELECTOR (202) FOR SELECTING ONLY A SIGN BIT FROM A RECEIVED HDTV SIGNAL; A CORRELATION PORTION (206) FOR DETERMINING THE CORRELATION VALUE OF THE SELECTED SIGN BIT AND A PREDETERMINED REFERENCE SIGNAL; A DETECTOR (208,210) FOR COMPARING THE CORRELATION VALUE WITH A THRESHOLD VALUE, TD THEREBY DETERMINE A FIELD SYNC TIMING SIGNAL; AND A GENERATOR (212,214,216) FOR GENERATING A FIELD SYNC SIGNAL WHICH HAS A LOGIC "HIGH" LEVEL DURING ONE FIELD SYNC SEGMENT INTERVAL IN RESPONSE TO THE FIELD SYNC TIMING SIGNAL. HERE, ONLY ONE MSB OF INPUT DATA IS SELECTED AND THEN CORRELATION WITH THE REFERENCE SIGNAL IS DETERMINED. ACCORDINGLY, A FIELD SYNC SIGNAL WHICH HAS A LOGIC "HIGH" LEVEL DURING ONE FIELD SEGMENT INTERVAL IN EACH FIELD CAN BE ACCURATELY DETECTED, AND THUS A HARDWARE STRUCTURE IS SIMPLIFIED. FIGURE 4