Television systems

HELECTRICITY H04Electric communication H04NPICTORIAL COMMUNICATION

H04N7/00Television systems

H04N7/002Special television systems not provided for by H04N7/007 - H04N7/18 H04N7/005using at least one opto-electrical conversion device H04N7/007Systems with supplementary picture signal insertion during a portion of the active part of a television signal H04N7/01Conversion of standards involving analogue television standards or digital television standards processed at pixel level H04N7/0102involving the resampling of the incoming video signal H04N7/0105using a storage device with different write and read speed H04N7/0107using beam gun storage H04N7/011using magnetic recording H04N7/0112one of the standards corresponding to a cinematograph film standard H04N7/0115with details on the detection of a particular field or frame pattern in the incoming video signal H04N7/0117involving conversion of the spatial resolution of the incoming video signal H04N7/012Conversion between an interlaced and a progressive signal H04N7/0122the input and the output signals having different aspect ratios H04N7/0125one of the standards being a high definition standard H04N7/0127by changing the field or frame frequency of the incoming video signal H04N7/013the incoming video signal comprising different parts having originally different frame rate H04N7/0132the field or frame frequency of the incoming video signal being multiplied by a positive integer H04N7/0135involving interpolation processes H04N7/0137dependent on presence/absence of motion H04N7/014involving the use of motion vectors H04N7/0142the interpolation being edge adaptive H04N7/0145the interpolation being class adaptive H04N7/0147the interpolation using an indication of film mode or an indication of a specific pattern H04N7/015High-definition television systems H04N7/0152using spatial or temporal subsampling H04N7/0155using pixel blocks H04N7/0157with motion estimation H04N7/025Systems for the transmission of digital non-picture data H04N7/0255Display systems therefor H04N7/03Subscription systems therefor H04N7/035Circuits for the digital non-picture data signal H04N7/0352for regeneration of the clock signal H04N7/0355for discrimination of the binary level of the digital data H04N7/0357for error detection or correction H04N7/04Systems for the transmission of one television signal H04N7/045the carrier being frequency modulated H04N7/06Systems for the simultaneous transmission of one television signal H04N7/063Simultaneous transmission of separate parts of one picture H04N7/066the carriers being allocated to more than one television channel H04N7/08Systems for the simultaneous or sequential transmission of more than one television signal H04N7/0803using frequency interleaving H04N7/0806the signals being two or more video signals H04N7/081the additional information signals being transmitted by means of a subcarrier H04N7/083with signal insertion during the vertical and the horizontal blanking interval H04N7/084with signal insertion during the horizontal blanking interval only H04N7/085the inserted signal being digital H04N7/0855the signal being time-compressed before its insertion and subsequently decompressed at reception H04N7/087with signal insertion during the vertical blanking interval only H04N7/088the inserted signal being digital H04N7/0881the signal being time-compressed before its insertion and subsequently decompressed at reception H04N7/0882for the transmission of character code signals H04N7/0884for the transmission of additional display-information H04N7/0885for the transmission of subtitles H04N7/0887for the transmission of programme or channel identifying signals H04N7/0888Subscription systems therefor H04N7/10Adaptations for transmission by electric cable H04N7/102Circuits therefor H04N7/104Switchers or splitters H04N7/106for domestic distribution H04N7/108the cable being constituted by a pair of wires H04N7/12Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal H04N7/122involving expansion and subsequent compression of a signal segment H04N7/125the signal segment being a picture element H04N7/127Systems in which different parts of the picture signal frequency band are individually processed H04N7/14Systems for two-way working H04N7/141between two video terminals H04N7/142Constructional details of the terminal equipment H04N7/144camera and display on the same optical axis H04N7/147Communication arrangements H04N7/148Interfacing a video terminal to a particular transmission medium H04N7/15Conference systems H04N7/152Multipoint control units therefor H04N7/155involving storage of or access to video conference sessions H04N7/157defining a virtual conference space and using avatars or agents H04N7/16Analogue secrecy systems Analogue subscription systems H04N7/161Constructional details of the subscriber equipment H04N7/162Authorising the user terminal H04N7/163by receiver means only H04N7/164Coin-freed apparatus H04N7/165Centralised control of user terminal ; Registering at central H04N7/166Passage/non-passage of the television signal H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible H04N7/1675Providing digital key or authorisation information for generation or regeneration of the scrambling sequence H04N7/169Systems operating in the time domain of the television signal H04N7/1693by displacing synchronisation signals relative to active picture signals or vice versa H04N7/1696by changing or reversing the order of active picture signal portions H04N7/171Systems operating in the amplitude domain of the television signal H04N7/1713by modifying synchronisation signals H04N7/1716by inverting the polarity of active picture signal portions H04N7/173with two-way working H04N7/17309Transmission or handling of upstream communications H04N7/17318Direct or substantially direct transmission and handling of requests H04N7/17327with deferred transmission or handling of upstream communications H04N7/17336Handling of requests in head-ends H04N7/17345Control of the passage of the selected programme H04N7/17354in an intermediate station common to a plurality of user terminals H04N7/17363at or near the user terminal H04N7/18Closed circuit television systems H04N7/181for receiving images from a plurality of remote sources H04N7/183for receiving images from a single remote source H04N7/185from a mobile camera H04N7/186Video door telephones H04N7/188Capturing isolated or intermittent images triggered by the occurrence of a predetermined event H04N7/20Adaptations for transmission via a GHz frequency band H04N7/22Adaptations for optical transmission H04N7/24Systems for the transmission of television signals using pulse code modulation H04N7/52Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/54the signals being synchronous H04N7/56Synchronising systems therefor