| 摘要 |
A method for producing a static composite video signal for delivery to a unit under test. Prime image memory (PIM 28) holding a main bit mapped image, sync and blanking patterns for video signal are held in a composite-sync memory (C-Sync 32), and series of bit line patterns defined in test program are held in pulse memories (USPs 36, 38). Data blocks, corresponding to a complete video line, are arranged in line parameter memory (LPM 40). Video signal is initiated by reading the LPM (40) and extracting pointers from data blocks for a first line of video signal. Bits from the PIM (28), C-Sync (32) and USPs (36, 38), are obtained based on the extracted pointers to form the video signal. Three streams of data are created by directing a memory addresses value to counter (90) for memory (92), each stream of data is converted by D/A converters (94a, 94b, 94c), and directed to output channels (96a, 96b, 96c).
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