Digital signal with multilevel symbols and sync recognition

Details Digital signal with multilevel symbols and sync recognition Digital signal with multilevel symbols and sync recognition

1994-03-02

1997-01-28

Harvey, David E.

Television

Format

Including pulse modulation of video signal

348495, H04N 700

Patent

active

055982204

ABSTRACT:
A digital video field identification system includes video signals formatted in blocks of video symbols in repetitive data segments with each data segment including a synchronizing signal character. One data segment includes a field timing signal. A reference data segment which includes a reference field timing signal is developed at the receiver. A portion of each data segment is compared with the reference field timing signal and the number of symbol errors is accumulated for each data segment. The data segment exhibiting the least number of symbol errors is identified as the one having the field timing signal. A confidence counter stabilizes the identification of the one data segment. For terrestrial transmission, the video signals are precoded in modulo N form to enable NTSC co-channel interference rejection in the receiver by a linear filter. The linear filter undesirably reduces the S/N ratio by 3 dB and a selection circuit is included for bypassing the linear filter (for the video data) based upon the errors developed in the signal paths with and without the linear filter. For cable transmissions no linear filter is included.

REFERENCES:
patent: 3755624 (1973-08-01), Sekimoto
patent: 3971888 (1976-07-01), Ching et al.
patent: 4675722 (1987-06-01), Hackett
Digital Communications Fundamentals & Applications; Bernard Sklar, Prentice Hall, 1988, pp. 460-464.

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