Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-05-02
1988-12-06
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358166, 358225, 382 54, H04N 140
Patent
active
047899018
ABSTRACT:
The line of a document is focused onto a series of reading elements, such as the cells of a charge coupled device, from which a serial output signal is obtained and applied to an analogue-to-digital converter. In order to compensate for the fall-off in the transfer function of the objective and the said elements at high spatial frequencies, the signal is processed, before A/D conversion, by a multi-stage filter (27), comprising an adjustable band pass stage (36) for setting the zero level, an adjustable band pass stage (41) for setting the output level and an intermediate band pass stage (38) with unity gain, which eliminates sampling noise. Matching is provided by an input, low pass filter, emitter follower stage (33) and an output, high pass filter, emitter follower stage (43).
REFERENCES:
patent: 3471638 (1969-10-01), De Groat
patent: 3566027 (1971-02-01), Paine
patent: 3588331 (1971-06-01), Vermillion
patent: 3622699 (1971-11-01), Richeson, Jr.
patent: 3845242 (1974-10-01), Richeson, Jr. et al.
patent: 4342050 (1982-07-01), Traino
patent: 4495404 (1985-01-01), Carmichael
patent: 4589034 (1986-05-01), Yokomizo
patent: 4605971 (1986-08-01), Kimura
Augusti Ferdinando
Bonatto Luigi
Puglisi Anna M.
Coles Sr. Edward L.
Ing. C. Olivetti & Co., S.p.A.
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