Abstract: A video signal encoding system includes a signal processor for segmenting encoded video data into transport blocks having a header section and a packed data section. The system also includes reset control apparatus for releasing resets of system components, after a global system reset, in a prescribed non-simultaneous phased sequence to enable signal processing to commence in the prescribed sequence. The phased reset release sequence begins when valid data is sensed as transiting the data lines.

Abstract: A high definition video system processes a bitstream including high and low priority variable length coded Data words. The coded Data is separated into packed High Priority Data and packed Low Priority Data by means of respective data packing units. The coded Data is continuously applied to both packing units. High Priority and Low Priority Length words indicating the bit lengths of high priority and low priority components of the coded Data are applied to the high and low priority data packers, respectively. The Low Priority Length word is zeroed when High Priority Data is to be packed for transport via a first output path, and the High Priority Length word is zeroed when Low Priority Data is to be packed for transport via a second output path.

Abstract: In a DPCM video digital data communication system each scan line of a video frame is refreshed with PCM data over a refresh cycle comprising a plurality of frames. Refresh generators at the transmitter and at the receiver are synchronized with an initialization signal and then run asynchronously to select scan lines for refresh. The refresh generators each employ counters for counting a selected number M, which has no factors in common with the number of scan lines of a frame, to select scan lines for refresh which have respectively different spatial positions in adjacent frames to avoid generating visible refresh artifacts. The number of frames in a refresh cycle is adaptively changed to stabilize the fill of the transmitter rate buffer.

Abstract: In a DPCM video digital data communication system, each scan line of a video frame is refreshed with PCM data over a refresh cycle comprising a plurality of frames. Refresh generators at the transmitter and at the receiver are synchronized with an initialization signal and with subsequent refresh cycle synchronizing signals. Also the scan lines and frames are synchronized with corresponding transmitted marker synchronizing signals. The refresh generators run asynchronously between marker synchronizing signals to select scan lines for refresh. The refresh generators each employ counters for counting a selected number M which is an integer having no factors in common with the number of scan lines of a frame to select scan lines for refresh which have different spatial positions in adjacent successive frames to avoid generating visible refresh artifacts.

Abstract: At a sending station in a digital television transmission system embodying the invention, time-division multiplexing either of the spatial-frequency analyses of the video signals from a television camera or of their interframe DPCM responses, both of which have uniform coding rates, is completed prior to symbol coding of interframe DPCM samples. This obviates the problems of time-division multiplexing symbol codes of variable length and of irregular coding rate. Time-division multiplexing is done so as to facilitate symbol coding protocols which include run-length encoding of DPCM samples. At a receiving station in the digital television transmission system time-division demultiplexing takes place after symbol decoding, being done on a per scan line basis.

Abstract: A transmitter applies luminance and chroma components of a color television signal to a transmission path, such as a VTR or satellite, in amplitude compressed form. To obtain optimum improvement in S/N ratio, different compression laws for the luminance and chroma components are used. The signals can also be time compressed and sent in TDM form.

Abstract: Frame-to-frame comb filter for separating chrominance and luminance components of composite video signals produce distortions around the periphery of reproduced moving images. The color distortions are corrected by selectively adding the combed luminance signal to the combed chrominance signal during periods of detected motion, and bandpass filtering the combined signal to pass only the chrominance spectrum.