Claims
- 1. A converter for converting a video signal from a first to a second scan rate comprising:
- a pixel buffer for storing a portion of the video signal having a first interlaced raster video scan rate;
- an address generator for determining a display location for the video signal;
- a non-interlaced raster frame buffer operatively connected to the pixel buffer for storing the video signal at a second scan rate differing from the first scan rate;
- a control sequencer operatively connected to the pixel buffer and to the address generator for providing the portion of the video signal stored in the pixel buffer and the display location to the frame buffer upon occurrence of a predetermined event; and
- a means for controlling video data written into the frame buffer on a per-pixel basis so as to provide clipping of multiple overlapping windows, wherein the windows are of any size and shape.
- 2. A method of converting a scan rate of a video signal comprising the steps of:
- storing a portion of the video signal which is at a first scan rate;
- providing the stored portion of the video signal to a frame buffer at second scan rate differing from the first scan rate upon occurrence of a predetermined event;
- determining a location on a display for the video signal;
- providing the portion of the video signal stored in the frame buffer to the display at the predetermined location; and
- controlling video data written into the frame buffer on a per-pixel basis so as to provide clipping of multiple overlapping windows, wherein the windows are of any size and shape.
- 3. The device of claim 1, wherein the means for controlling comprises memory including a bit associated with each pixel.
- 4. The device of claim 3, wherein the bit associated with each pixel is a portion of the frame buffer.
- 5. The device of claim 2 further comprising, so as to control the data written into the frame buffer on a per-pixel basis, providing a dedicated bit in memory for each pixel.
- 6. The device of claim 5 wherein the dedicated memory bit is a portion of the frame buffer.
- 7. A converter for converting a video signal from a first to a second scan rate comprising:
- a pixel buffer for storing a portion of the video signal having a first interlaced raster video scan rate;
- an address generator for determining a display location for the video signal;
- a non-interlaced raster frame buffer operatively connected to the pixel buffer for storing the video signal at a second scan rate differing form the first scan rate;
- a control sequencer operatively connected to the pixel buffer and to the address generator for providing the portion of the video signal stored in the pixel buffer and the display location to the frame buffer upon occurrence of a predetermined event; and
- a means for controlling data written into the frame buffer on a per-pixel basis so as to provide clipping of multiple overlapping windows, wherein the windows are of any size and shape.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in part of copending U.S. patent application Ser. No. 07/466,038, filed Dec. 5, 1989, now abandoned..
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0175341 |
Mar 1986 |
EPX |
Non-Patent Literature Citations (2)
Entry |
Leonard, Eugene "Considerations Regarding the Use of Digital Data to Generate Video Backgrounds" SMPTE Journal vol. 87, pp. 499-504, Aug. 1978. |
IBM Technical Disclosure Bulletin, vol. 28, No. 6, Nov. 1, 1985, pp. 2615-2620; `Video Compatibility Feature`. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
446038 |
Dec 1989 |
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