Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-07-19
1976-01-27
Griffin, Robert
Telegraphy
Systems
Simplex-reversing periodic
H04N 538
Patent
active
039353834
ABSTRACT:
A television camera which scans an image provides a camera video signal having an amplitude representative of light received from an element of the image being scanned. Prior to a scan a sync pulse is generated which increments a raster counter. Accordingly, the roster counter provides a signal representation of a cumulative number of scans of the image. During the scanning, clock pulses increment a horizontal deflection counter which provides a signal representation of a horizontal deflection number corresponding to the horizontal coordinate of the line of sight. When the cumulative number of scans equals the horizontal deflection number, a comparator provides a gating signal which causes a sample and hold circuit to store a sampled video signal having an amplitude equal to the amplitude of the camera video signal. The sampled video signal is provided to the input of an analog to digital converter for conversion to digital signals which may be stored in a digital computer. A succession of sampled video signals is representative of the image when the cumulative number of scans exceeds a maximum horizontal deflection number.
REFERENCES:
patent: 3621130 (1971-11-01), Paine
patent: 3715489 (1973-02-01), Brown et al.
patent: 3718757 (1973-02-01), Gulitz et al.
patent: 3740466 (1973-06-01), Marshall et al.
Griffin Robert
Saffian Mitchell
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