IPC 6 English version H04N 5/00-H04N 5/956

IPC ⁶ English version

H04N - H04N 3/40

H04N00500-H04N005956

H04N 7/00 - H04N 101:00

SECTION H– ELECTRICITY

H 04

ELECTRIC COMMUNICATION TECHNIQUE

H 04 N

PICTORIAL COMMUNICATION, e.g. TELEVISION (measuring, testing G 01; systems for autographic writing, e.g. writing telegraphy, which involve following an outline G 08; information storage based on relative movement between record carrier and transducer G 11 B; coding, decoding or code conversion, in general H 03 M; broadcast distribution or the recording of use made thereof H 04 H) [4]

Details of television systems (scanning details or combination thereof with generation of supply voltages H 04 N 3/00; specially adapted for colour television H 04 N 9/00) [4]

Synchronising (for television systems using pulse code modulation H 04 N 7/24; in general H 03 L 7/00) [4]

Synchronising circuits with arrangements for extending range of synchronisation, e.g. by using switching between several time constants [2]

Generation of synchronising signals

067

Arrangements or circuits at the transmitter end [4]

073

for mutually locking plural sources of synchronising signals, e.g. studios or relay stations [4]

Separation of synchronising signals from picture signals

Separation of line synchronising signal from frame synchronising signal

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]

Picture signal circuitry for video frequency region (H 04 N 5/222 takes precedence) [2]

Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

by means of "clamp" circuit operated by switching circuit

Circuitry for controlling amplitude response

202

Gamma control [4]

205

for correcting amplitude versus frequency characteristic [4]

208

for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction [4]

Circuitry for suppressing or minimising disturbance, e.g. moire, halo (suppression of noise in television recording H 04 N 5/911)

213

Circuitry for suppressing or minimising impulsive noise (H 04 N 5/217 takes precedence) [4]

217

in picture signal generation [4]

222

Studio circuitry; Studio devices; Studio equipment [4]

225

Television cameras [4]

228

Circuit details for pick-up tubes [4]

232

Devices for controlling television cameras, e.g. remote control (H 04 N 5/235 takes precedence; control of exposure for cameras G 03 B 7/00); focusing for cameras G 03 B 13/00; varying magnification for cameras G 03 B 17/00 [4]

235

Circuitry for compensating for variation in the brightness of the object [4]

238

by influencing optical part of the camera [4]

243

by influencing the picture signal [4]

247

Arrangement of television cameras [4]

253

Picture signal generating by scanning motion picture films or slide opaques, e.g. for telecine (scanning details therefor H 04 N 3/36) [4]

257

Picture signal generators using flying-spot scanners (H 04 N 5/253 takes precedence) [4]

262

Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects [4]

265

Mixing [4]

268

Signal distribution or switching (for broadcasting H 04 H 1/00) [4]

272

Means for inserting a foreground image in a background image, i.e. inlay, outlay [4]

275

Generation of keying signals [4]

278

Subtitling [4]

Mobile studios

Transforming light or analogous information into electric information (H 04 N 5/222 takes precedence; scanning details H 04 N 3/00; light transforming elements H 01 J, H 01 L) [2,4]

Transforming ultrasonic, sonic or infrasonic radiation [4]

Transforming X-rays

321

with video transmission of fluoroscopic images [5]

325

Image enhancement, e.g. by subtraction techniques using polyenergetic X-rays [5]

Transforming infra-red radiation [2]

335

using electrically scanned solid-state devices (H 04 N 5/32, H 04 N 5/33 take precedence) [4]

Transmitter circuitry (H 04 N 5/14 takes precedence) [4]

Modulation circuits

for transmitting at will black-and-white or colour signals

Receiver circuitry (H 04 N 5/14 takes precedence) [4]

445

for displaying additional information (H 04 N 5/50 takes precedence) [4]

Picture in picture [4]

455

Demodulation-circuits (demodulation in general H 03 D) [4]

for receiving on more than one standard at will (deflecting circuits of multi-standard receivers H 04 N 3/27) [4]

Tuning indicators; Automatic tuning control (tuning control in general H 03 J) [4]

Automatic gain control [4]

Keyed automatic gain control [4]

for positively-modulated picture signals (H 04 N 5/53 takes precedence) [4]

for negatively-modulated picture signals (H 04 N 5/53 takes precedence) [4]

Control of contrast or brightness [4]

in dependance upon ambient light [4]

in dependance upon beam current of cathode ray tube [4]

for the sound signals

Intercarrier circuits, i.e. heterodyning sound and vision carriers

Generation or supply of power specially adapted for television receivers (generation of supply voltages in combination with electron beam deflecting H 04 N 3/18; regulating of voltage or current in general G 05 F; transformers H 01 F; supplying or distributing electric power, in general H 02 J; static converters H 02 M) [4]

Constructional details of receivers, e.g. cabinets, dust covers (furniture aspects A 47 B, e.g. A 47 B 81/06) [2]

645

Mounting of picture tube on chassis or in housing

Holding-devices for protective discs or for picture masks

655

Construction or mounting of chassis, e.g. for varying the elevation of the tube

Transforming electric information into light information (scanning details H 04 N 3/00)

Circuit details for cathode-ray display tubes

Circuit details for electroluminescent devices

Modifying the appearance of television pictures by optical filters or diffusing screens (optical filters or diffusing screens per se G 02 B 5/00)

Projection arrangements for image reproduction, e.g. using eidophor (optical systems in general G 02 B)

Television signal recording (diagnosis, testing or measuring of television signal recorders H 04 N 17/06; recording in connection with measuring G 01 D; information storage in general G 11, e.g. G 11 B) [3,4]

765

Interface circuits between an apparatus for recording and another apparatus (associated working of recording or reproducing apparatus with a television camera or receiver in which the television signal is not significantly involved G 11 B 31/00) [6]

between a recording apparatus and a television camera [6]

775

between a recording apparatus and a television receiver [6]

using magnetic recording (H 04 N 5/91 takes precedence) [3]

781

on discs or drums [3]

782

on tape [3]

7822

with stationary magnetic heads [6]

7824

with rotating magnetic heads [6]

7826

involving helical scanning of the magnetic tape [6]

7828

involving transversal scanning of the magnetic tape [6]

783

Adaptations for reproducing at a rate different from the recording rate [3]

784

on a sheet [6]

using electrostatic recording (H 04 N 5/91 takes precedence) [3]

using deformable thermoplastic recording medium

on discs or drums [3]

using optical recording (H 04 N 5/80, H 04 N 5/89, H 04 N 5/91 take precedence) [3,4]

on discs or drums [3]

Producing a motion picture film from a television signal (scanning of motion picture films for television signal generation H 04 N 3/36; television signal generation by scanning a motion picture film H 04 N 5/253, H 04 N 9/11) [3,4]

using holographic recording (H 04 N 5/91 take precedence) [3]

on discs or drums [3]

903

using variable electrical capacitive recording (H 04 N 5/91 takes precedence) [4]

907

using static stores, e.g. storage tubes, semiconductor memories (H 04 N 5/91 takes precedence; based on relative movement between record carrier and transducer H 04 N 5/78 to H 04 N 5/903) [4]

Television signal processing therefor (of colour signals H 04 N 9/79) [3]

911

for the suppression of noise [6]

913

for scrambling (scrambling of a television signal for transmission H 04 N 7/167) [6]

915

for field- or frame-skip recording or reproducing [6]

917

for bandwidth reduction (bandwidth reduction H 04 N 7/12; using pulse code modulation H 04 N 7/24) [6]

919

by dividing samples or signal segments, e.g. television lines, among a plurality of recording channels [6]

Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback [3]

921

by recording or reproducing the baseband signal [6]

922

by modulation of the signal on a carrier wave, e.g. amplitude or frequency modulation [6]

923

using preemphasis of the signal before modulation and deemphasis of the signal after demodulation [6]

924

using duty cycle modulation [6]

926

by pulse code modulation (H 04 N 5/919 takes precedence) [6]

928

the sound signal being pulse code modulated and recorded in time division multiplex with the modulated video signal [6]

Regeneration of the television signal or of selected parts thereof [3]

931

for restoring the level of the reproduced signal [6]

932

Regeneration of analogue synchronisation signals [6]

935

Regeneration of digital synchronisation signals [6]

937

by assembling picture element blocks in an intermediate store [6]

Signal drop-out compensation [3]

945

for signals recorded by pulse code modulation (error detection or correction of digital signals for recording in general G 11 B 20/18) [6]

Time-base error compensation [3]

953

by using an analogue memory, e.g. a CCD-shift register, the delay of which is controlled by a voltage controlled oscillator [6]

956

by using a digital memory with independent write-in and read-out clock generators [6]

H04N - H04N 3/40

H04N 7/00 - H04N 101:00