Apparatus for increasing number of scanning lines

Details Apparatus for increasing number of scanning lines Apparatus for increasing number of scanning lines

1989-05-18

1990-05-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358158, H04N 1106

Patent

active

049221183

ABSTRACT:
The present invention relates to a scanning line converter which converts the number of scanning lines into a multiple thereof. Write-clock-pulses and read-clock-pulses for controlling read/write accesses to a video memory, are produced on a basis of signals obtained by differentiating both a horizontal synchronizing signal and a double-speed horizontal synchronizing signal with respect to stable master clock pulses. The double-speed horizontal synchronizing signal is stabilized by a method, wherein double-speed horizontal oscillation pulses with a multiple frequency of the horizontal synchronizing signal, are delayed and further converted to a saw-tooth-wave signal, and the phase errors between the saw-tooth-wave signal and the horizontal synchronizing signal are fed back to the double-speed horizontal pulse oscillator.

REFERENCES:
patent: 3172951 (1965-03-01), Field
patent: 4658293 (1987-04-01), Arai et al.
patent: 4802009 (1989-01-01), Hartmeier
patent: 4831441 (1989-05-01), Ando

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