Television – Format conversion – Changing number of lines for standard conversion
Patent
1993-04-12
1995-04-25
Kostak, Victor R.
Television
Format conversion
Changing number of lines for standard conversion
348446, 348448, H04N 701
Patent
active
054103576
ABSTRACT:
A scan converter processes an input video signal having a fixed number of an lines per frame, a horizontal synchronization rate and a vertical synchronization rate on an input video line to produce an output video signal having a predetermined number of scan lines per frame and a selected number of pixels per line on a video output line. The scan converter locks to the vertical synchronization rate of the input video signal to make the output video signal have a vertical synchronization rate equal to the vertical synchronization rate of the input video signal. The output horizontal rate is determined by multiplying the vertical synchronization rate by the predetermined number of scan lines per frame in the output video signal. The input horizontal synchronization rate is multiplied by the selected number of pixels per line to produce a WRITE pointer signal for writing input picture lines into a memory. The output horizontal rate is multiplied by the selected number of pixels per line to produce a READ pointer signal for reading picture lines of the output video signal out of the memory.
REFERENCES:
patent: 4872054 (1989-10-01), Gray et al.
patent: 5229853 (1993-07-01), Myers
Gattis Sherri L.
Rieger James L.
Forrest, Jr. John L.
Gilbert Harvey A.
Kostak Victor R.
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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