Data segment sync detection circuit and method thereof

Details Data segment sync detection circuit and method thereof Data segment sync detection circuit and method thereof

1996-07-19

1999-09-28

Le, Vu

Television

Synchronization

Control of picture position

348194, 348495, 348500, 348521, 358410, 331 20, H04N 752

Patent

active

059596821

ABSTRACT:
A circuit for detecting a data segment sync signal of data segment consisting of a plurality of symbols in a high-definition television, includes a correlator for detecting a correlation value from a received data segment signal, a segment integrator for accumulating the detected correlation value by segments and attenuating the accumulated correlation value in response to an overflow prevention signal, a maximum-value detector for detecting a maximum accumulated correlation value in the segment from the segment integrator output, an overflow prevention circuit for generating the overflow prevention signal by comparing the detected maximum accumulated correlation value with a predetermined reference value, a sync position detector for detecting a symbol position having the detected maximum accumulated correlation value, and a synchronization signal generator for generating a synchronization signal at the symbol position corresponding to the detected maximum accumulated correlation value. The circuit precisely detects data segment sync, by generating the maximum value among the accumulated correlation values in each data segment, even when the position of a data segment sync pulse changes due to errors in the received signal.

REFERENCES:
patent: 4675722 (1987-06-01), Hackett
patent: 5416524 (1995-05-01), Citta et al.
patent: 5420640 (1995-05-01), Munich et al.
patent: 5444743 (1995-08-01), Scarpa
patent: 5486869 (1996-01-01), Cooper
Proceedings of the IEEE, vol. 83, No. 2, Feb. 1, 1995, pp. 158-173, XP000501239, Challapali K et al: "The Grand Alliance System For US HDTV", pp. 170-172.

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