Details of colour television systems


  • CPC
  • H04N9/00
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H04N9/04Picture signal generators H04N9/045using solid-state devices H04N9/07with one pick-up device only H04N9/077whereby the colour signals are characterised by their phase H04N9/083whereby the colour signals are characterised by their frequency H04N9/09with more than one pick-up device H04N9/093Systems for avoiding or correcting misregistration of video signals H04N9/097Optical arrangements associated therewith H04N9/10using optical-mechanical scanning means only H04N9/11Scanning of colour motion picture films H04N9/12Picture reproducers H04N9/14using optical-mechanical scanning means only H04N9/16using cathode ray tubes H04N9/18using separate electron beams for the primary colour signals H04N9/20with more than one beam in a tube H04N9/22using the same beam for more than one primary colour information H04N9/24using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position H04N9/26using electron-optical colour selection means H04N9/27with variable depth of penetration of electron beam into the luminescent layer H04N9/28Arrangements for convergence or focusing H04N9/285using quadrupole lenses H04N9/29using demagnetisation or compensation of external magnetic fields H04N9/30using solid-state colour display devices H04N9/31Projection devices for colour picture display H04N9/3102using two-dimensional electronic spatial light modulators H04N9/3105for displaying all colours simultaneously H04N9/3108by using a single electronic spatial light modulator H04N9/3111for displaying the colours sequentially H04N9/3114by using a sequential colour filter producing one colour at a time H04N9/3117by using a sequential colour filter producing two or more colours simultaneously H04N9/312Driving therefor H04N9/3123using pulse width modulation H04N9/3126for spatial light modulators in series H04N9/3129scanning a light beam on the display screen H04N9/3132using one-dimensional electronic spatial light modulators H04N9/3135Driving therefor H04N9/3138using arrays of modulated light sources H04N9/3141Constructional details thereof H04N9/3144Cooling systems H04N9/3147Multi-projection systems H04N9/315Modulator illumination systems H04N9/3152for shaping the light beam H04N9/3155for controlling the light source H04N9/3158for controlling the spectrum H04N9/3161using laser light sources H04N9/3164using multiple light sources H04N9/3167for polarizing the light beam H04N9/317Convergence or focusing systems H04N9/3173wherein the projection device is specially adapted for enhanced portability H04N9/3176wherein the projection device is incorporated in a camera H04N9/3179Video signal processing therefor H04N9/3182Colour adjustment H04N9/3185Geometric adjustment H04N9/3188Scale or resolution adjustment H04N9/3191Testing thereof H04N9/3194including sensor feedback H04N9/3197using light modulating optical valves H04N9/43Conversion of monochrome picture signals to colour picture signals for colour picture display H04N9/44Colour synchronisation H04N9/45Generation or recovery of colour sub-carriers H04N9/455Generation of colour burst signals Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals H04N9/465Synchronisation of the PAL-switch H04N9/47for sequential signals H04N9/475for mutually locking different synchronisation sources H04N9/64Circuits for processing colour signals H04N9/641Multi-purpose receivers H04N9/642Multi-standard receivers H04N9/643Hue control means H04N9/645Beam current control means H04N9/646for image enhancement H04N9/647I.F amplifiers H04N9/648Video amplifiers H04N9/65for synchronous modulators H04N9/66for synchronous demodulators H04N9/67for matrixing H04N9/68for controlling the amplitude of colour signals H04N9/69for modifying the colour signals by gamma correction H04N9/70for colour killing H04N9/71combined with colour gain control H04N9/72for reinsertion of dc and slowly varying components of colour signal H04N9/73colour balance circuits H04N9/735for picture signal generators H04N9/74for obtaining special effects H04N9/75Chroma key H04N9/76for mixing of colour signals H04N9/77Circuits for processing the brightness signal and the chrominance signal relative to each other H04N9/78for separating the brightness signal or the chrominance signal from the colour television signal H04N9/79Processing of colour television signals in connection with recording H04N9/7904using intermediate digital signal processing H04N9/7908Suppression of interfering signals at the reproducing side H04N9/7912the interfering signals being intermodulation signals H04N9/7917the interfering signals being cross-talk signals H04N9/7921for more than one processing mode H04N9/7925for more than one standard H04N9/793for controlling the level of the chrominance signal H04N9/7933the level control being frequency-dependent H04N9/7936by using a preemphasis network at the recording side and a deemphasis network at the reproducing side H04N9/797for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal H04N9/7973by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels H04N9/7976by spectrum folding of the high frequency components of the luminance signal H04N9/80Transformation of the television signal for recording H04N9/802involving processing of the sound signal H04N9/804involving pulse code modulation of the colour picture signal components H04N9/8042involving data reduction H04N9/8045using predictive coding H04N9/8047using transform coding H04N9/806with processing of the sound signal H04N9/8063using time division multiplex of the PCM audio and PCM video signals H04N9/8066with insertion of the PCM audio signals in the vertical blanking interval of the PCM video signal H04N9/808involving pulse code modulation of the composite colour video-signal H04N9/8081involving data reduction H04N9/8082using predictive coding H04N9/8085with processing of the sound signal H04N9/8087using time division multiplex of the PCM audio and PCM video signals H04N9/8088with insertion of the PCM audio signals in the vertical blanking interval of the PCM video signal H04N9/81the individual colour picture signal components being recorded sequentially only H04N9/82the individual colour picture signal components being recorded simultaneously only H04N9/8205involving the multiplexing of an additional signal and the colour video signal H04N9/8211the additional signal being a sound signal H04N9/8216using time division multiplex H04N9/8222using frequency division multiplex H04N9/8227the additional signal being at least another television signal H04N9/8233the additional signal being a character code signal H04N9/8238for teletext H04N9/8244involving the use of subcodes H04N9/825the luminance and chrominance signals being recorded in separate channels H04N9/8255with sound processing H04N9/83the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal H04N9/831using intermediate digital signal processing H04N9/832using an increased bandwidth for the luminance or the chrominance signal H04N9/833with selection of the conventional or the increased bandwidth signal H04N9/835involving processing of the sound signal H04N9/8355the sound carriers being frequency multiplexed between the luminance carrier and the chrominance carrier H04N9/84the recorded signal showing a feature, which is different in adjacent track parts H04N9/85the recorded brightness signal occupying a frequency band totally overlapping the frequency band of the recorded chrominance signal H04N9/86the individual colour picture signal components being recorded sequentially and simultaneously H04N9/87Regeneration of colour television signals H04N9/8707using a demodulator and a remodulator H04N9/8715involving the mixing of the reproduced video signal with a non-recorded signal H04N9/8722Regeneration of a colour reference signal H04N9/873for restoring the colour component sequence of the reproduced chrominance signal H04N9/877by assembling picture element blocks in an intermediate memory H04N9/88Signal drop-out compensation H04N9/882the signal being a composite colour television signal H04N9/885using a digital intermediate memory H04N9/888for signals recorded by pulse code modulation H04N9/89Time-base error compensation H04N9/893using an analogue memory H04N9/896using a digital memory with independent write-in and read-out clock generators H04N9/898using frequency multiplication of the reproduced colour signal carrier with another auxiliary reproduced signal