| 主权项 |
1. Video signal waveform monitoring apparatus for receiving an input video signal composed of video lines, and whose level is to be monitored, the apparatus comprising:
a video signal digitizer configured to sample the input video signal at video sample points, thereby generating a sequence of video pixel data; an acquisition framestore organized into a video pixel array having rows corresponding to video lines and columns corresponding to video sample points, into which the sequence of video pixel data is written so as to represent a raster of the input video signal; a level analyzer configured to serially read video pixel data row-by-row from segments of the video pixel array, and configured to increment video level data at addresses in cache memory in response to the serially-read video pixel data, from which a sequence of video level data is generated; and an output framestore organized into a display pixel array, into which the sequence of video level data is written, and which when read for display represents the level of the waveform of the input video signal; wherein the segments of the video pixel array comprise at least one and less than all of the columns in the video pixel array. |
