apparatus and instruments for viewing, recording, transmission, processing and reproduction of digital or analog, sound or images, namely, video-audio signal distributors, audio and video signal switchers and matrix switchers, video-audio enhancers, color processors, RF processors, special effects generators, video encoders and decoders, electronic video signal scalers and scan converters, video standard converters, video time base correctors, computer genlock equipment, namely, genlock messa...