Patent ID: 7564905
Filing Date: 2009-07-21
Classification: H04H,H04N

Abstract:
1. A terrestrial digital broadcasting system, comprising: a broadcasting station for multiplexing video, voice and additional signals into transport stream (TS) and transmitting the TS to transmitting stations; and a plurality of transmitting stations for receiving the TS and broadcasting the TS to receiving stations through a single frequency network, wherein the broadcasting station includes: a transmission synchronization means for inserting a field synchronization header to the TS in a predetermined data field period N, wherein N is a natural number, and wherein the plurality of transmitting stations include: a transmission synchronization detecting means for synchronizing the TS transmitted from the broadcasting station based on the field synchronization header; and a trellis encoding means for generating initialization symbols of a predetermined length in a predetermined data field period M and synchronizing the TS outputted to the receiving stations, and M is a natural number, wherein the trellis encoding means includes: a first switching unit for initializing output values of a trellis coded modulation (TCM) encoder and a memory of the TCM encoder performing switching to values stored in the memory of the TCM encoder instead of input signals to the TCM encoder every M period, wherein the TCM encoder includes a first feedback loop to initialize the memory of the TCM encoder after receiving the values stored in the memory of the TCM encoder from the first switching unit; a second switching unit for initializing output values of a precoder and a memory of the precoder by performing switching to values stored in the memory of the precoder instead of input signals to the precoder every M period, wherein the precoder includes a second feedback loop to initialize the memory of the precoder after receiving the values stored in the memory of the precoder from the second switching unit; and wherein when the memory of the precoder is initialized by the second feedback loop, the trellis encoding means generates two initialization symbols in the predetermined data field period M.