Patent ID: 6816204
Filing Date: 2004-11-09
Classification: H04L,H04N

Abstract:
A method of structuring each of a succession of consecutive, non-overlapping data fields for digital television broadcasting to at least one receiver having adaptive equalization and echo suppression filtering therein, said method comprising steps of:dividing each said data field into a prescribed number of successive data segments, each containing a prescribed number of plural-modulation-level symbols; and beginning each data segment with a respective data segment synchronizing sequence of common type, which data segment synchronizing sequence is composed entirely of symbols of first and second modulation levels as used in said plural-modulation-level symbols; said method being improved to comprise a further step of: including, within each of periodically occurring groups of at least two consecutive data segments in said succession of consecutive data fields, a prescribed number of consecutive cycles at least two of a repetitive pseudo-random noise sequence composed entirely of symbols each of one of said first and said second modulation levels, said repetitive pseudo-random noise sequence extending into each of the data segments of that one of said groups of at least two consecutive data segments in which said repetitive pseudo-random noise sequence is included, and said consecutive cycles of said repetitive pseudo-random noise sequence subsuming therewithin each said data segment synchronizing sequence of said common type between the consecutive data segments in that said one of said groups of at least two consecutive data segments in which said repetitive pseudo-random noise sequence is included.