Process and apparatus for digitally clamping pulse code modulate

Details Process and apparatus for digitally clamping pulse code modulate Process and apparatus for digitally clamping pulse code modulate

1978-07-31

1980-07-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328165, 178 661, 455 99, H04N 518, H04B 112

Patent

active

042109337

ABSTRACT:
A process and associated apparatus for digitally clamping pulse code modulated video signals is disclosed, including four separate preferred embodiments. The disclosed process first requires that during each horizontal scanning interval a difference between the binary value of the pulse code modulated video signal and a predetermined nominal binary value be determined. This difference is then arithmetically averaged with at least one similarly determined difference obtained during a prior horizontal scanning interval to obtain a binary correction value. The binary correction value is then added to the binary value of the pulse code modulated video signal which is to be clamped outside the horizontal scanning interval in the active range of a horizontal period.

REFERENCES:
patent: 3476875 (1969-11-01), Davis
patent: 4124869 (1978-11-01), Heitmann

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