Analog-digital conversion method, and a picture reproduction met

Details Analog-digital conversion method, and a picture reproduction met Analog-digital conversion method, and a picture reproduction met

1979-05-22

1980-09-09

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340347SH, 358138, 358263, H04N 140, H04N 712

Patent

active

042220777

ABSTRACT:
A method of analog-digital conversion is disclosed, wherein sub-sampling of an analog signal is performed at a certain multiple n of the basic sampling rate, wherein a discrimination signal including extreme position signals is obtained by detecting the level difference between the analog signal and an unsharp signal, and wherein from n consecutively-produced values representative of the analog signal the digital signal to be output is obtained as being; if the extreme position signal is detected, then the consecutively-produced representative value corresponding thereto; otherwise, the average of the n consecutively-produced representative values.

REFERENCES:
patent: 2962548 (1960-11-01), Taudt
patent: 2989741 (1961-06-01), Gordon et al.
patent: 3879724 (1975-04-01), McDonald

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