H
SECTION H — ELECTRICITY
 H04
ELECTRIC COMMUNICATION TECHNIQUE
 H04

Note(s)

This class covers electrical communication systems with propagation paths employing light (optical communication), infra-red, ultrasonic, sonic, or infrasonic waves.

 H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION (measuring, testing G01; systems for autographic writing, e.g. writing telegraphy, which involve following an outline G08; information storage based on relative movement between record carrier and transducer G11B; coding, decoding or code conversion, in general H03M; broadcast distribution or the recording of use made thereof H04H)
 H04N

Note(s)

  1. This subclass covers:
    • transmission of pictures or their transient or permanent reproduction either locally or remotely, by methods involving both the following steps:

      step (a):
      the scanning of a picture, i.e. resolving the whole picture-containing area into individual picture-elements and the derivation of picture-representative electric signals related thereto, simultaneously or in sequence;

      step (b):
      the reproduction of the whole picture-containing area by the reproduction of individual picture-elements into which the picture is resolved by means of picture-representative electric signals derived therefrom, simultaneously or in sequence;

    • (in group H04N 1/00) systems for the transmission or the reproduction of arbitrarily composed pictures or patterns in which the local light variations composing a picture are not subject to variation with time, e.g. documents (both written and printed), maps, charts, photographs (other than cinematograph films);
    • circuits specially designed for dealing with pictorial communication signals, e.g. television signals, as distinct from merely signals of a particular frequency range.
  2. This subclass does not cover:
  3. In this subclass, the following expression is used with the meaning indicated:
    • "television systems" means those systems for the transmission and reproduction of arbitrarily composed pictures in which the local light variations composing a picture may change with time, e.g. natural "live" scenes, recordings of such scenes such as cinematograph films.
 H04N 1/00
Transmission or reproduction of pictures or patterns not varying in time, e.g. facsimile transmission
 H04N 1/02
( covered by H04N 1/00 )
 H04N 1/024
·  Details of scanning heads  [3]
 H04N 1/028
·  ·  for picture-information pick-up  [3]
 H04N 1/032
·  ·  for picture-information reproducing  [3]
 H04N 1/036
·  ·  ·  for optical reproducing  [3]
 H04N 1/04
·  Scanning arrangements (H04N 1/387 takes precedence)
 H04N 1/06
·  ·  using cylindrical picture-bearing surfaces
 H04N 1/08
·  ·  ·  Mechanisms for mounting or holding the sheet around the drum
 H04N 1/10
·  ·  using flat picture-bearing surfaces
 H04N 1/12
·  ·  using the sheet-feed movement as the slow scanning component
 H04N 1/14
·  ·  ·  using a rotating endless belt carrying the scanning heads
 H04N 1/16
·  ·  ·  using a rotating helical element
 H04N 1/17
·  ·  the scanning speed being dependent on content of picture  [2]
 H04N 1/18
·  ·  arranged for simultaneous transmission of separate parts of one picture
 H04N 1/20
·  ·  arranged for simultaneous transmission of two or more separate pictures
 H04N 1/21
·  Intermediate information storage (H04N 1/387, H04N 1/41 take precedence; information storage in general G11)  [4]
 H04N 1/22
( transferred to H04N 1/21, H04N 1/23 )
 H04N 1/23
·  Reproducing arrangements (details of scanning heads H04N 1/024; scanning arrangements therefor H04N 1/04)  [4]
 H04N 1/26
( transferred to H04N 1/21, H04N 1/23 )
 H04N 1/27
·  ·  Involving production of a magnetic intermediate picture  [4]
 H04N 1/28
( transferred to H04N 1/21, H04N 1/27 )
 H04N 1/29
·  ·  Involving production of an electrostatic intermediate picture  [4]
 H04N 1/30
( transferred to H04N 1/21, H04N 1/29 )
 H04N 1/31
·  ·  Mechanical arrangements for picture transmission, e.g. adaptation of clutches, gearing, gear transmissions  [2]
 H04N 1/32
·  Circuits or arrangements for control or supervision between transmitter and receiver
 H04N 1/34
·  ·  for coin-freed systems
 H04N 1/36
·  ·  for synchronising or phasing transmitter and receiver
 H04N 1/38
·  Circuits or arrangements for blanking or otherwise eliminating unwanted parts of pictures (H04N 1/387 takes precedence)
 H04N 1/387
·  Composing, repositioning or otherwise modifying originals (photoelectronic composing of characters B41B 19/00)  [4]
 H04N 1/393
·  ·  Enlarging or reducing  [4]
 H04N 1/40
·  Picture signal circuits (H04N 1/387 takes precedence)
 H04N 1/41
·  Bandwidth or redundancy reduction (by scanning H04N 1/17)  [3]
 H04N 1/411
·  ·  for the transmission or reproduction of two-tone pictures, e.g. black and white pictures  [4]
 H04N 1/413
·  ·  ·  Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information  [4]
 H04N 1/415
·  ·  ·  ·  in which the picture-elements are subdivided or grouped into fixed one-dimensional or two-dimensional blocks  [4]
 H04N 1/417
·  ·  ·  ·  using predictive or differential encoding  [4]
 H04N 1/419
·  ·  ·  ·  in which encoding of the length of a succession of picture-elements of the same value along a scanning line is the only encoding step  [4]
 H04N 1/42
·  Systems for two-way working
 H04N 1/44
·  Secrecy systems
 H04N 1/46
·  Colour picture communication systems
 H04N 3/00
Scanning details of television systems; Combination thereof with generation of supply voltages
 H04N 3/02
·  by optical-mechanical means only (H04N 3/36 takes precedence; optical scanning systems in general G02B 26/10)  [2]
 H04N 3/04
·  ·  having a moving aperture
 H04N 3/06
·  ·  having a moving lens or other refractor
 H04N 3/08
·  ·  having a moving reflector
 H04N 3/09
·  ·  ·  for electromagnetic radiation in the invisible region, e.g. infra-red  [4]
 H04N 3/10
·  by means not exclusively optical-mechanical (H04N 3/36 takes precedence; devices or arrangements for the electro-, magneto- or acousto-optical modulation or deflection of light beams G02F)  [2]
 H04N 3/12
·  ·  by switched stationary formation of lamps, photocells, or light relays
 H04N 3/14
·  ·  by means of electrically scanned solid-state devices
 H04N 3/15
·  ·  ·  for picture signal generation  [3]
 H04N 3/16
·  ·  by deflecting electron beam in cathode-ray tube (producing sawtooth waveforms H03K 4/00)
 H04N 3/18
·  ·  ·  Generation of supply voltages, in combination with electron beam deflecting
 H04N 3/185
·  ·  ·  ·  Maintaining dc voltage constant (regulation of dc voltage in general G05F)  [4]
 H04N 3/19
·  ·  ·  ·  Arrangements or assemblies in supply circuits for the purpose of withstanding high voltages  [3]
 H04N 3/195
·  ·  ·  ·  ·  Flyback transformers; Constructional details thereof  [4]
 H04N 3/20
·  ·  ·  Prevention of damage to cathode-ray tubes in event of failure of scanning
 H04N 3/22
·  ·  ·  Circuits for controlling dimensions, shape or centering of picture on screen
 H04N 3/223
·  ·  ·  ·  Controlling dimensions (by maintaining the cathode-ray tube high voltage constant H04N 3/185)  [4]
 H04N 3/227
·  ·  ·  ·  Centering  [4]
 H04N 3/23
·  ·  ·  ·  Distortion correction, e.g. for pincushion distortion correction, S-correction  [4]
 H04N 3/233
·  ·  ·  ·  ·  using active elements  [4]
 H04N 3/237
·  ·  ·  ·  ·  using passive elements  [4]
 H04N 3/24
·  ·  ·  Blanking circuits
 H04N 3/26
·  ·  ·  Modifications of scanning arrangements to improve focusing (focusing circuits in general H01J)
 H04N 3/27
·  ·  ·  Circuits special to multi-standard receivers (circuitry of multi-standard receivers in general H04N 5/46)  [3]
 H04N 3/28
·  ·  producing multiple scanning, i.e. using more than one spot at the same time
 H04N 3/30
·  ·  otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
 H04N 3/32
·  ·  ·  Velocity varied in dependence upon picture information
 H04N 3/34
·  ·  ·  Elemental scanning area oscillated rapidly in direction transverse to main scanning direction
 H04N 3/36
·  Scanning of motion picture films, e.g. for telecine  [2]
 H04N 3/38
·  ·  with continuously moving film  [4]
 H04N 3/40
·  ·  with intermittently moving film  [4]
 H04N 5/00
Details of television systems (scanning details or combination thereof with generation of supply voltages H04N 3/00; details specific to colour television H04N 9/00)
 H04N 5/02
( transferred to H04N 7/01 )
 H04N 5/04
·  Synchronising (for television systems using pulse code modulation H04N 7/13; in general H03L 7/00)
 H04N 5/05
·  ·  Synchronising circuits with arrangements for extending range of synchronisation, e.g. by using switching between several time constants  [2]
 H04N 5/06
·  ·  Generation of synchronising signals
 H04N 5/067
·  ·  ·  Arrangements or circuits at the transmitter end  [4]
 H04N 5/073
·  ·  ·  ·  for mutually locking plural sources of synchronising signals, e.g. studios or relay stations  [4]
 H04N 5/08
·  ·  Separation of synchronising signals from picture signals
 H04N 5/10
·  ·  ·  Separation of line synchronising signal from frame synchronising signal
 H04N 5/12
·  ·  Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising  [2]
 H04N 5/13
( transferred to H04N 17/04, H04N 17/06 )
 H04N 5/14
·  Picture signal circuitry for video frequency region (H04N 5/222 takes precedence)  [2]
 H04N 5/16
·  ·  Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
 H04N 5/18
·  ·  ·  by means of "clamp" circuit operated by switching circuit
 H04N 5/19
( transferred to H04N 5/235 )
 H04N 5/193
( transferred to H04N 5/238 )
 H04N 5/197
( transferred to H04N 5/243 )
 H04N 5/20
·  ·  Circuitry for controlling amplitude response
 H04N 5/202
·  ·  ·  Gamma control  [4]
 H04N 5/205
·  ·  ·  for correcting amplitude versus frequency characteristic  [4]
 H04N 5/208
·  ·  ·  ·  for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction  [4]
 H04N 5/21
·  ·  Circuitry for suppressing or minimising disturbance, e.g. moire, halo
 H04N 5/213
·  ·  ·  Circuitry for suppressing or minimising impulsive noise (H04N 5/217 takes precedence)  [4]
 H04N 5/217
·  ·  ·  in picture signal generation  [4]
 H04N 5/22
( transferred to H04N 5/262 )
 H04N 5/222
·  Studio circuitry; Studio devices; Studio equipment  [4]
 H04N 5/225
·  ·  Television cameras  [4]
 H04N 5/228
·  ·  ·  Circuit details for pick-up tubes  [4]
 H04N 5/232
·  ·  ·  Devices for controlling television cameras, e.g. remote control (H04N 5/235 takes precedence; focusing for cameras G03B 3/00; varying magnification for cameras G03B 5/00; control of exposure for cameras G03B 7/00)  [4]
 H04N 5/235
·  ·  ·  Circuitry for compensating for variation in the brightness of the object  [4]
 H04N 5/238
·  ·  ·  ·  by influencing optical part of the camera  [4]
 H04N 5/24
( transferred to H04N 5/222 )
 H04N 5/243
·  ·  ·  ·  by influencing the picture signal  [4]
 H04N 5/247
·  ·  ·  Arrangement of television cameras  [4]
 H04N 5/253
·  ·  Picture signal generating by scanning motion picture films or slide opaques, e.g. for telecine (scanning details therefor H04N 3/36)  [4]
 H04N 5/257
·  ·  Picture signal generators using flying-spot scanners (H04N 5/253 takes precedence)  [4]
 H04N 5/26
( transferred to H04N 5/225 )
 H04N 5/262
·  ·  Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects  [4]
 H04N 5/265
·  ·  ·  Mixing  [4]
 H04N 5/268
·  ·  ·  Signal distribution or switching (for broadcasting H04H 1/00)  [4]
 H04N 5/272
·  ·  ·  Means for inserting a foreground image in a background image, i.e. inlay, outlay  [4]
 H04N 5/275
·  ·  ·  ·  Generation of keying signals  [4]
 H04N 5/278
·  ·  ·  Subtitling  [4]
 H04N 5/28
·  ·  Mobile studios
 H04N 5/30
·  Transforming light or analogous information into electric information (H04N 5/222 takes precedence; scanning details H04N 3/00; light transforming elements H01J, H01L)
 H04N 5/31
·  ·  Transforming ultrasonic, sonic or infrasonic radiation  [4]
 H04N 5/32
·  ·  Transforming X-rays
 H04N 5/33
·  ·  Transforming infra-red radiation  [2]
 H04N 5/335
·  ·  using electrically scanned solid-state devices (H04N 5/32, H04N 5/33 take precedence)  [4]
 H04N 5/34
( transferred to H04N 5/228 )
 H04N 5/36
( transferred to H04N 5/257 )
 H04N 5/38
·  Transmitter circuitry (H04N 5/14 takes precedence)
 H04N 5/40
·  ·  Modulation circuits
 H04N 5/42
·  ·  for transmitting at will black-and-white or colour signals
 H04N 5/44
·  Receiver circuitry (H04N 5/14 takes precedence)
 H04N 5/445
·  ·  for displaying additional information (H04N 5/50 takes precedence)  [4]
 H04N 5/45
·  ·  ·  Picture in picture  [4]
 H04N 5/455
·  ·  Demodulation-circuits (demodulation in general H03D)  [4]
 H04N 5/46
·  ·  for receiving on more than one standard at will (deflecting circuits of multi-standard receivers H04N 3/27)
 H04N 5/48
( transferred to H04N 5/14, H04N 5/44, H04N 5/445, H04N 5/57 )
 H04N 5/50
·  ·  Tuning indicators; Automatic tuning control (tuners per se H03J)
 H04N 5/52
·  ·  Automatic gain control
 H04N 5/53
·  ·  ·  Keyed automatic gain control  [4]
 H04N 5/54
·  ·  ·  for positively-modulated picture signals (H04N 5/53 takes precedence)
 H04N 5/56
·  ·  ·  for negatively-modulated picture signals (H04N 5/53 takes precedence)
 H04N 5/57
·  ·  Control of contrast or brightness  [4]
 H04N 5/58
·  ·  ·  in dependance upon ambient light
 H04N 5/59
·  ·  ·  in dependance upon beam current of cathode ray tube  [4]
 H04N 5/60
·  ·  for the sound signals
 H04N 5/62
·  ·  ·  Intercarrier circuits, i.e. heterodyning sound and vision carriers
 H04N 5/63
·  Generation or supply of power specially adapted for television receivers (generation of supply voltages in combination with electron beam deflecting H04N 3/18; regulating of voltage or current in general G05F; transformers H01F; supplying or distributing electric power, in general H02J; static converters H02M)  [4]
 H04N 5/64
·  Constructional details of receivers, e.g. cabinets, dust covers (furniture aspects A47B, e.g. A47B 81/06)  [2]
 H04N 5/645
·  ·  Mounting of picture tube on chassis or in housing
 H04N 5/65
·  ·  Holding-devices for protective discs or for picture masks
 H04N 5/655
·  ·  Construction or mounting of chassis, e.g. for varying the elevation of the tube
 H04N 5/657
( transferred to H04N 3/195 )
 H04N 5/66
·  Transforming electric information into light information (scanning details H04N 3/00)
 H04N 5/68
·  ·  Circuit details for cathode-ray display tubes
 H04N 5/70
·  ·  Circuit details for electroluminescent devices
 H04N 5/72
·  Modifying the appearance of television pictures by optical filters or diffusing screens (optical filters or diffusing screens per se G02B 5/00)
 H04N 5/74
·  Projection arrangements for image reproduction, e.g. using eidophor (optical systems in general G02B)
 H04N 5/76
·  Television signal recording (diagnosis, testing or measuring of television signal recorders H04N 17/06; recording in connection with measuring G01D; information storage in general G11, e.g. G11B)
 H04N 5/78
·  ·  using magnetic recording (H04N 5/91 takes precedence)  [3]
 H04N 5/781
·  ·  ·  on discs or drums  [3]
 H04N 5/782
·  ·  ·  on tape  [3]
 H04N 5/783
·  ·  ·  ·  Adaptations for reproducing at a rate different from the recording rate  [3]
 H04N 5/80
·  ·  using electrostatic recording (H04N 5/91 takes precedence)  [3]
 H04N 5/82
·  ·  ·  using deformable thermoplastic recording medium
 H04N 5/83
·  ·  ·  ·  on discs or drums  [3]
 H04N 5/84
·  ·  using optical recording (H04N 5/80, H04N 5/89, H04N 5/91 take precedence)
 H04N 5/85
·  ·  ·  on discs or drums  [3]
 H04N 5/87
·  ·  ·  Producing a motion picture film from a television signal (scanning of motion picture films for television signal generation H04N 3/36; television signal generation by scanning a motion picture film H04N 5/253, H04N 9/11)  [3]
 H04N 5/89
·  ·  using holographic recording (H04N 5/91 take precedence)  [3]
 H04N 5/90
·  ·  ·  on discs or drums  [3]
 H04N 5/903
·  ·  using variable electrical capacitive recording (H04N 5/91 takes precedence)  [4]
 H04N 5/907
·  ·  using static stores, e.g. storage tubes, semiconductor memories (H04N 5/91 takes precedence; based on relative movement between record carrier and transducer H04N 5/78-H04N 5/903)  [4]
 H04N 5/91
·  ·  Television signal processing therefor (of colour signals H 04 N 9/491)  [3]
 H04N 5/92
·  ·  ·  Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback  [3]
 H04N 5/93
·  ·  ·  Regeneration of the television signal or of selected parts thereof, e.g. synchronisation signal processing  [3]
 H04N 5/94
·  ·  ·  ·  Signal drop-out compensation  [3]
 H04N 5/95
·  ·  ·  ·  Time-base error compensation  [3]
 H04N 7/00
Television systems (details H04N 3/00, H04N 5/00; systems specific to colour television H04N 11/00; stereoscopic television systems H04N 13/00, H04N 15/00)
 H04N 7/01
·  Conversion of standards  [4]
 H04N 7/02
( transferred to H04N 17/00 )
 H04N 7/04
·  Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier (H04N 7/087, H04N 7/093 take precedence)
 H04N 7/06
·  Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier (H04N 7/087, H04N 7/093 take precedence)
 H04N 7/08
·  Systems for the transmission of more signals than one television signal, e.g. additional information signals, simultaneously or sequentially, the signals occupying wholly or partially the same frequency band (H04N 7/087, H04N 7/093 take precedence)
 H04N 7/087
·  Systems with signal insertion during the vertical blanking interval  [4]
 H04N 7/093
·  Systems with signal insertion during the horizontal blanking interval  [4]
 H04N 7/10
·  Adaptations for transmission by electrical cable (H04N 7/12 takes precedence)
 H04N 7/12
·  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 (H04N 7/13 takes precedence; by special scanning H04N 3/00)
 H04N 7/13
·  Systems for the transmission of television signals using pulse code modulation  [3]
 H04N 7/133
·  ·  involving transform coding  [4]
 H04N 7/137
·  ·  involving predictive coding  [4]
 H04N 7/14
·  Systems for two-way working (H04N 7/173 takes precedence)
 H04N 7/16
·  Secrecy systems; Subscription systems
 H04N 7/167
·  ·  Systems rendering the television signal unintelligible and subsequently intelligible  [4]
 H04N 7/173
·  ·  with two-way working, e.g. subscriber sending a programme selection signal  [4]
 H04N 7/18
·  Closed-circuit television systems, i.e. systems in which the signal is not broadcast
 H04N 7/20
·  Adaptations for transmission via a GHz frequency band, e.g. via satellite  [4]
 H04N 7/22
·  Adaptations for optical transmission  [4]
 H04N 9/00
Details of colour television systems
 H04N 9/02
( transferred to H04N 11/00 )
 H04N 9/04
·  Picture signal generators
 H04N 9/07
·  ·  with one pick-up device only  [2]
 H04N 9/077
·  ·  ·  whereby the colour signals are characterised by their phase  [4]
 H04N 9/083
·  ·  ·  whereby the colour signals are characterised by their frequency  [4]
 H04N 9/09
·  ·  with more than one pick-up device  [2]
 H04N 9/093
·  ·  ·  Systems for avoiding or correcting misregistration of video signals  [4]
 H04N 9/097
·  ·  ·  Optical arrangements associated therewith, e.g. for beam-splitting, for colour correction (beam-splitting per se G02B 27/10)  [4]
 H04N 9/10
·  ·  using optical-mechanical scanning means only (H04N 9/11 takes precedence; optical scanning systems in general G02B 26/10)
 H04N 9/11
·  ·  Scanning of colour motion picture films, e.g. for telecine  [2]
 H04N 9/12
·  Picture reproducers (devices or arrangements for the electro-, magneto- or acousto-optical modulation or deflection of light beams G02F)
 H04N 9/14
·  ·  using optical-mechanical scanning means only (H04N 9/11 takes precedence; optical scanning systems in general G02B 26/10)
 H04N 9/16
·  ·  using cathode ray tubes (H04N 9/11 takes precedence; cathode-ray tubes H01J 31/00)
 H04N 9/18
·  ·  ·  using separate electron beams for the primary colour signals (H04N 9/27 takes precedence)
 H04N 9/20
·  ·  ·  ·  with more than one beam in a tube
 H04N 9/22
·  ·  ·  using the same beam for more than one primary colour information (H04N 9/27 takes precedence)
 H04N 9/24
·  ·  ·  ·  using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position
 H04N 9/26
·  ·  ·  ·  using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen
 H04N 9/27
·  ·  ·  with variable depth of penetration of electron beam into the luminescent layer, e.g. penetrons  [2]
 H04N 9/28
·  ·  ·  Arrangements for convergence or focusing
 H04N 9/285
·  ·  ·  ·  using quadrupole lenses (quadrupole lenses per se G21K 1/08, H01J 3/14, H01J 29/58, H01J 37/10)  [4]
 H04N 9/29
·  ·  ·  using demagnetisation or compensation of external magnetic fields  [2]
 H04N 9/30
·  ·  using solid-state colour display devices
 H04N 9/31
·  ·  Projection devices for colour picture display  [2]
 H04N 9/32
( transferred to H04N 11/06 )
 H04N 9/34
( transferred to H04N 11/08 )
 H04N 9/36
( transferred to H04N 11/12 )
 H04N 9/38
( transferred to H04N 11/14 )
 H04N 9/39
( transferred to H04N 11/16 )
 H04N 9/40
( transferred to H04N 11/18 )
 H04N 9/42
( transferred to H04N 11/22 )
 H04N 9/43
·  Conversion of monochrome picture signals to colour picture signals for colour picture display  [4]
 H04N 9/44
·  Colour synchronisation
 H04N 9/45
·  ·  Generation or recovery of colour sub-carriers  [4]
 H04N 9/455
·  ·  Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals (H04N 9/45 takes precedence)  [4]
 H04N 9/46
( transferred to H04N 9/45, H04N 9/455,H04N 9/465-H04N 9/475 )
 H04N 9/465
·  ·  Synchronisation of the PAL-switch  [4]
 H04N 9/47
·  ·  for sequential signals  [2]
 H04N 9/475
·  ·  for mutually locking different synchronisation sources  [4]
 H04N 9/49
( transferred to H04N 9/70 )
 H04N 9/491
( transferred to H04N 9/79 )
 H04N 9/493
( transferred to H04N 9/80 )
 H04N 9/495
( transferred to H04N 9/81 )
 H04N 9/497
( transferred to H04N 9/82 )
 H04N 9/499
( transferred to H04N 9/86 )
 H04N 9/50
( transferred to H04N 9/65, H04N 9/66, H04N 9/67 )
 H04N 9/52
( transferred to H04N 9/67 )
 H04N 9/53
( transferred to H04N 9/69 )
 H04N 9/535
( transferred to H04N 9/64 )
 H04N 9/537
( transferred to H04N 9/68, H04N 9/74 )
 H04N 9/539
( transferred to H04N 9/76 )
 H04N 9/54
( transferred to H04N 13/00 )
 H04N 9/56
( transferred to H04N 13/02 )
 H04N 9/58
( transferred to H04N 13/04 )
 H04N 9/60
( transferred to H04N 15/00 )
 H04N 9/62
( transferred to H04N 17/00 )
 H04N 9/64
·  Circuits for processing colour signals (H04N 9/77 takes precedence)  [4]
 H04N 9/65
·  ·  for synchronous modulators  [4]
 H04N 9/66
·  ·  for synchronous demodulators  [4]
 H04N 9/67
·  ·  for matrixing  [4]
 H04N 9/68
·  ·  for controlling the amplitude of colour signals, e.g. automatic chroma control circuits (H04N 9/71, H04N 9/73 take precedence)  [4]
 H04N 9/69
·  ·  ·  for modifying the colour signals by gamma correction  [4]
 H04N 9/70
·  ·  for colour killing  [4]
 H04N 9/71
·  ·  ·  combined with colour gain control  [4]
 H04N 9/72
·  ·  for reinsertion of dc and slowly varying components of colour signals  [4]
 H04N 9/73
·  ·  colour balance circuits, e.g. white balance circuits, colour temperature control  [4]
 H04N 9/74
·  ·  for obtaining special effects (H04N 9/65-H04N 9/73 take precedence)  [4]
 H04N 9/75
·  ·  ·  Chroma key  [4]
 H04N 9/76
·  ·  ·  for mixing of colour signals (H04N 9/75 takes precedence)  [4]
 H04N 9/77
·  Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase (circuits for matrixing H04N 9/67)  [4]
 H04N 9/78
·  ·  for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter  [4]
 H04N 9/79
·  Processing of colour television signals in connection with recording  [4]
 H04N 9/80
·  ·  Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback  [4]
 H04N 9/81
·  ·  ·  the individual colour picture signal components being recorded sequentially only  [4]
 H04N 9/82
·  ·  ·  the individual colour picture signal components being recorded simultaneously only  [4]
 H04N 9/83
·  ·  ·  ·  the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal  [4]
 H04N 9/84
·  ·  ·  ·  ·  the recorded signal showing a feature, which is different in adjacent track parts, e.g. different phase or frequency  [4]
 H04N 9/85
·  ·  ·  ·  the recorded brightness signal occupying a frequency band totally overlapping the frequency band of the recorded chrominance signal, e.g. frequency interleaving  [4]
 H04N 9/86
·  ·  ·  the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system  [4]
 H04N 9/87
·  ·  Regeneration of colour television signals (H04N 9/80 takes precedence)  [4]
 H04N 9/88
·  ·  ·  Signal drop-out compensation  [4]
 H04N 9/89
·  ·  ·  Time-base error compensation  [4]
 H04N 11/00
Colour television systems (details H04N 9/00; stereoscopic H04N 15/00)  [4]
 H04N 11/02
·  with bandwidth reduction (H04N 11/04 takes precedence)  [4]
 H04N 11/04
·  using pulse code modulation  [4]
 H04N 11/06
·  Transmission systems characterised by the manner in which the individual colour picture signal components are combined  [4]
 H04N 11/08
·  ·  using sequential signals only (dot sequential systems H04N 11/12)  [4]
 H04N 11/10
·  ·  ·  in which colour signals are inserted in the blanking interval of brightness signal  [4]
 H04N 11/12
·  ·  using simultaneous signals only  [4]
 H04N 11/14
·  ·  ·  in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system  [4]
 H04N 11/16
·  ·  ·  ·  the chrominance signal alternating in phase, e.g. PAL-system  [4]
 H04N 11/18
·  ·  using simultaneous and sequential signals, e.g. SECAM-system  [4]
 H04N 11/20
·  ·  Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards  [4]
 H04N 11/22
·  ·  ·  in which simultaneous signals are converted into sequential signals or vice versa  [4]
 H04N 13/00
Stereoscopic television systems; Details thereof (H04N 15/00 takes precedence)  [4]
 H04N 13/02
·  Picture signal generators  [4]
 H04N 13/04
·  Picture reproducers  [4]
 H04N 15/00
Stereoscopic colour television systems; Details thereof  [4]
 H04N 17/00
Diagnosis, testing or measuring for television systems or their details  [4]
 H04N 17/02
·  for colour television signals  [4]
 H04N 17/04
·  for receivers  [4]
 H04N 17/06
·  for recorders  [4]