Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-12-18
1986-09-09
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358154, 358159, 375120, 331 20, 331 25, H04N 504, H04N 700
Patent
active
046112308
ABSTRACT:
Phase shifting means are provided for altering the phase relationship between a vertical sync signal the resulting vertical retrace and video information in a video display environment. The video display is adjustably repositioned both up and down on the display raster by means of phase adjustment circuitry. A single loop having first and second delay circuits provides phase shifting. The output vertical sync signal lags or leads in phase the originally received vertical sync signal by the difference between the first delay and second delay values. The first delay is interposed between the incoming vertical sync signal and the phase locked loop system. The second delay circuit is interposed in the loop between the output vertical sync signal and the phase detector for locking the output vertical sync signal in phase with the delayed original sync signal. Either or both of the first and second delay circuits may be adjustable to vary the amount of phase shift introduced between the original vertical sync signal and the output vertical sync signal. When the phase of the output signal leads the phase of the original sync signal, the video display picture is shifted downward on the display raster. When the phase of the output signal lags the phase of the original vertical sync signal, the video display picture is shifted upward on the display raster.
REFERENCES:
patent: 4025951 (1977-05-01), Eckenbrecht
patent: 4231064 (1980-10-01), Uchida
patent: 4298890 (1981-11-01), Lai et al.
patent: 4521745 (1985-06-01), Falconer
Groody James J.
Parker Michael D.
Zenith Electronics Corporation
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