Method and apparatus for cancelling nontonal variations in a fac

Details Method and apparatus for cancelling nontonal variations in a fac Method and apparatus for cancelling nontonal variations in a fac

1976-05-10

1978-01-24

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, H04N 140, H04N 110

Patent

active

040706966

ABSTRACT:
A circuit for cancelling nontonal variations in the output signal from a facsimile scanner. The circuit generates a location signal which corresponds to the physical location of the document sample. The location signal is passed through a function generator, inverted and thereafter multiplied with the output signal of the scanner. Since the characteristic of the inverted function generator output is the reciprocal of the nontonal characteristics of the scanner signal, the resulting output signal from the multiplier is substantially free of nontonal variations.

REFERENCES:
patent: 2965711 (1960-12-01), James et al.
patent: 3697683 (1972-10-01), Gates et al.
patent: 3852640 (1974-12-01), McCarthy
patent: 3919473 (1975-11-01), Cotter

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