English: H 04 N 7/ 084 7/ 085 7/ 087 7/ 088 7 / 10 7 / 12 . . with signal insertion during the horizontal blanking interval [6] . . . the inserted signal being digital [6] . . with signal insertion during the vertical blanking interval [4] . . . the inserted signal being digital [6] . Adaptations for transmission by electrical cable (7/12 takes precedence) [4] . Systems 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 (7/24 takes precedence; high-definition television systems 7/015) [4] . Systems for two-way working (7/173 takes precedence) [4] . . Conference systems (telephonic conference arrangements H 04 M 3/56) [5] . Secrecy systems; Subscription systems . . Systems rendering the television signal unintelligible and subsequently intelligible [4] . . . Systems operating in the time domain of the television signal [6] . . . Systems operating in the amplitude domain of the television signal [6] . . with two-way working, e.g. subscriber sending a programme selection signal [4] . Closed-circuit television systems, i.e. systems in which the signal is not broadcast . Adaptations for transmission via a GHz frequency band, e.g. via satellite [4] . Adaptations for optical transmission [4] . Systems for the transmission of television signals using pulse code modulation [6] . . using bandwidth reduction (information reduction by code conversion in general H 03 M 7/30) [6] . . . using vector coding [6] . . . involving transform coding (7/50 takes precedence; digital computers for performing complex mathematical operations, e.g. domain transformation, G 06 F 17/14) [6] . . . involving predictive coding (7/48, 7/50 take precedence) [6] . . . . using spatial prediction [6] . . . . using temporal prediction [6] . . . . involving delta modulation (systems using differential pulse code modulation in general H 04 B 14/06) [6] . . . . . adaptive [6] . . . . involving differential modulation (systems using differential pulse code modulation in general H 04 B 14/06) [6] . . . . . adaptive [6] . . . . using subsampling at the coder and sample restitution by interpolation at the coder or decoder [6] . . . involving pulse code modulation and predictive coding [6] . . . involving transform and predictive coding [6] 7/ 52 . . Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal, a synchronising signal [6] . . . the signals being synchronous [6] . . . . Synchronising systems therefor [6] . . . involving more than one video signal [6] . . . the signals being asynchronous [6] . . . . Synchronising systems therefor [6] . . Systems for detection or correction of transmission errors (coding, decoding or code conversion for error detection or error correction in general H 03 M 13/00) [6] . . . using redundant codes [6] . . . using error concealment [6] Details of colour television systems [4] . Picture signal generators [4] . . with one pick-up device only [2,4] . . . whereby the colour signals are characterised by their phase [4] . . . whereby the colour signals are characterised by their frequency [4] . . with more than one pick-up device [4] . . . Systems for avoiding or correcting misregistration of video signals [4] . . . Optical arrangements associated therewith, e.g. for beam-splitting, for colour correction (beam-splitting in general G 02 B 27/10) [4] . . using optical-mechanical scanning means only (9/11 takes precedence; optical scanning systems in general G 02 B 26/10) [2,4] . . Scanning of colour motion picture films, e.g. for telecine [2,4] . Picture reproducers (devices or arrangements for the electro-, magneto- or acousto-optical modulation or deflection of light beams G 02 F) [2,4] . . using optical-mechanical scanning means only (9/11 takes precedence; optical scanning systems in general G 02 B 26/10) [2,4] . . using cathode ray tubes (9/11 takes precedence; cathode-ray tubes H 01 J 31/00) [2,4] . . . using separate electron beams for the primary colour signals (9/27 takes precedence) [2,4] . . . . with more than one beam in a tube [4] . . . using the same beam for more than one primary colour information (9/27 takes precedence) [2,4] . . . . using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position [4] . . . . using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen [4] . . . with variable depth of penetration of electron beam into the luminescent layer, e.g. penetrons [2,4] . . . Arrangements for convergence or focusing [4] . . . . using quadrupole lenses (quadrupole lenses per se G 21 K 1/08, H 01 J 3/14, 29/58, 37/10) [4] . . . using demagnetisation or compensation of external magnetic fields [2,4]
French: 8, Section H