audio and video equipment, namely, video processing amplifiers, vertical interval processors, digital frame synchronizers and line synchronizers, video distribution amplifiers, pulse distribution amplifiers, audio distribution amplifiers, audio/video switchers and control panels therefor, computer based digital video recording/playback units, audio/video router modules, audio and video multiplexers and demultiplexers, synchronizing pulse generators, video test signal generators, logo and ID generators, time code converters, digital systems for storage, file sorting and assembly, retrieval and playback of multiple field television images, television, video and audio standard/format converters and audio/video signal converters, encoders, decorders, and transcoders
Electrical and Scientific Apparatus