Patent ID: 6967694
Filing Date: 2005-11-22
Classification: H04H

Abstract:
1. A digital broadcast demodulator, being an apparatus for receiving digital broadcast by transmitting digital video and audio information coded by digital VSB modulation system in packet form, comprising: a circuit for establishing a synchronous signal in reception data based on a polarity of the most significant bit (MSB) of the reception transport packet data, wherein the circuit for establishing the synchronous signal in reception data comprises: a synchronous code pattern detecting circuit for detecting the segment synchronous code pattern from the most significant bit signal of the reception packet data, a symbol number counter circuit for counting the number of symbol data in the reception packet data, a synchronism detection establishing circuit for judging the true segment synchronous code pattern by obtaining the segment synchronous code pattern from said synchronous code pattern detecting circuit when said symbol number counter circuit finishes counting of a specified number, and a synchronism detection protection counter circuit for detecting and establishing the segment synchronous signal in the reception data from the output of said synchronous code pattern detecting circuit and count-up of specified number of said symbol number counter circuit.