Abstract: An architecture for multi-format video processing of both high definition and standard definition television signals has a pair of processing paths. For HDTV one path processes the luminance component signal and the other path processes an interleaved color difference signal that is the combination of a pair of color difference component signals. For SDTV only a single path is used. The luminance and color difference component signals are interleaved together and optionally stuffed with filler bits to provide an interleaved signal at a high data rate, such as the HDTV data rate or one-half the HDTV data rate, for processing. After processing the SDTV components are deinterleaved from the processed interleaved signal. The color difference component signals may be upsampled prior to interleaving and subsampled after deinterleaving to simplify control signals. Thus the architecture provides a single processor for processing either an HDTV signal or two SDTV signals, one on each of the two HDTV paths.

Abstract: Video signal processing apparatus comprises at least first and second source selectors each having a plurality of input terminals, for receiving a plurality of video signals respectively, and at least two output terminals. A set of video processors each have an input terminal and an output terminal. A processor selector is provided for connecting each source selector output terminal selectively to each video processor input terminal. First and second output devices each have a plurality of input terminals connected to the output terminals of the video processors respectively and also have an output terminal. Operator interfaces are connected to the processor selector for defining a first subset of video processors having their input terminals connected to the output terminals of the first source selector and a second subset of video processors having their input terminals connected to the output terminals of the second source selector.

Abstract: A video switcher comprises a source selector having a plurality of input terminals for connection to a plurality of video sources respectively, and at least two output terminals. At least two processing channels each have an input terminal connected to an output terminal of the source selector and also have an output terminal. A video combiner has video input terminals connected to the output terminals of the processing channels and is operative to combine the output signals provided by the processing channels in dependence upon priority signals.