Receiver post coder selection circuit

Details Receiver post coder selection circuit Receiver post coder selection circuit

1992-06-05

1993-11-09

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358188, 455 63, 455296, 375 99, 375103, H04N 5213

Patent

active

052607933

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 field reference data segment which includes the field timing signal is developed at the receiver. Each data segment is compared with the field reference data segment 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 field timing segment. A confidence counter stabilizes the identification of said one data segment. 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 3dB. 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.

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