| 摘要 |
A video signal waveform monitor receives an input video signal 401 composed of video lines. A video signal digitizer 402 samples the input video signal at video sample points to generate a sequence of video pixel data. An acquisition framestore 403 is organized into a video pixel array into which the sequence of video pixel data is written so as to represent a raster of the input video signal. A level analyzer 405 reads the video pixel data row-by-row from segments of the video pixel array and increments video level data at addresses in cache memory 406 in response to the serially read video pixel data, from which a sequence of video level data is generated. An output framestore 407 is provided 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. The level analyzer may be further configured to read video level data from the pixel array into the cache memory. This video level data corresponds to a previous analysis of a matching segment of the video pixel array so as to provide a persistence effect. |
