Abstract: Digital data to be communicated are provided with error correcting code. Between consecutive signals representing real, or valid data (pixels in TV transmission) there are interpolated "phantom" data signals so chosen as to maintain the encoded signal within the limited frequency spectrum available for communication. Upon reception, the valid data (pixels) are extracted from the sequence of valid and interpolated data (phantom pixels), thereby reconstituting the original valid data.

Abstract: A time base video equalizer and/or corrector for video tape or disk machines including a precorrector and a postcorrector section. The device is driven by a master video source, corrected or not, and synchronization with a slave video machine is achieved for the operation of interfaced special effects video devices. The jitter and coherence imperfections of the master video signal are followed by the slave machine thereby equating or synchronizing their timing components.

Abstract: A device for mixing video and audio signals originated from at least one remote camera and one director camera including a main unit having a circuit for synchronizing the video signals of the remote and director cameras, and a circuit for combining these signals through the use of removable special effects cartridges or subassemblies that are pre-programmed for predetermined video switching patterns. The circuit for synchronizing the video signals separates the sync signals from the director and remote cameras, locks the vertical, horizontal and color subcarrier on the director camera from the remote camera. The device is connected through junction box to director camera and video tape recorder, and directly to remote camera.