Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-05-14
1984-11-13
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358244, 358242, H04N 504, H04N 534
Patent
active
044829191
ABSTRACT:
A high ratio multilaced raster scan system for obscuring the blank spaces between the raster lines on a CRT when making a photograph or hard copy from the screen of the CRT utilizes a selectively varied DC bias voltage to vertically offset in a select sequence succeeding pulses in the vertical ramp pulse train signal which controls the vertical sweep position of the electron beam of the CRT to thereby provide a corresponding sequence of parallel interlaced raster lines vertically offset with respect to each other. The system is calibrated in a simple manner by utilizing an alternating DC bias voltage to vertically offset alternate pulses in the vertical ramp pulse train signal and thereby enable the user to calibrate the average DC level of the selectively varied DC bias voltage by aligning the raster lines of the first and second fields.
REFERENCES:
patent: 2625604 (1953-01-01), Edson
patent: 3499983 (1970-03-01), Masters
patent: 4096530 (1978-06-01), Plugge et al.
patent: 4251835 (1981-02-01), Eriksen
patent: 4264976 (1981-04-01), Yamashita
patent: 4307421 (1981-12-01), Smit
Alston Lawrence E.
Haroutunian David S.
Martin John C.
Polaroid Corporation
Roman Edward S.
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