Phabrix Limited

Alpha Image Limited

Phillip Adams

Barry D Miles

Barry Donald Ruberry Miles

A video signal waveform monitor is shown, which receives an input video signal composed of video lines. A video signal digitizer samples the input video signal at video sample points to generate a sequence of video pixel data, which is written into an acquisition framestore is organized into a video pixel array so as to represent a raster of the input video signal. A level analyzer 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 in response to the serially-read video pixel data. This generates a sequence of video level data, which is written into an output framestore and which represents the level of the waveform of the input video signal. The segments of the video pixel array comprise at least one and less than all of the columns in the video pixel array.

Monitoring video waveforms

A method and an apparatus for sampling a reference signal so as to generate an error signal indicative of a phase error between an actual sampling phase and a desired sampling phase. The desired sampling phase is displaceable from an optimum sampling phase, so as to facilitate the sampling of an NTSC color burst signal or to effect hue control during sampling of the modulated chroma sub-carrier. The reference signal is sampled at the frequency of said signal and a plurality of said samples are accumulated. After said samples have been accumulated, said accumulation is multiplied by the sine or by the cosine of the phase displacement angle between the optimum sampling phase and the derived sampling phase.

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Newbury, United Kingdom

Phillip Adams