This class covers electrical communication systems with propagation paths employing light (optical communication), infra-red, ultrasonic, sonic, or infrasonic waves.
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 Fulltext... Hierarchy... Expanded...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.
systems in which legible alphanumeric or like character forms are analysed according to step (a) of Note (1) to derive an electric signal from which the character is recognised by comparison with stored information, which are covered by subclass Fulltext... Hierarchy... Expanded...G06K;
systems for the direct photographic copying of an original picture in which an electric signal representative of the picture is derived according to the said step (a) and employed to modify the operation of the system, e.g. to control exposure, which are covered by class Fulltext... Hierarchy... Expanded...G03;
systems for the reproduction according to step (b) of Note (1) of pictures comprising alphanumeric or like character forms but involving the production of the equivalent of a signal which would be derived according to the above-mentioned step (a), e.g. by cams, punched card or tape, coded control signal, or other means, which are covered by the subclass for the application, e.g. Fulltext... Hierarchy... Expanded...G01D, Fulltext... Hierarchy... Expanded...G06F, Fulltext... Hierarchy... Expanded...H04L;
systems for the reproduction according to the above-mentioned step (b) of pictures comprising alphanumeric or like character forms and involving the generation according to the above-mentioned step (a) of picture-representative electric signals from a pre-arranged assembly of such characters, or records thereof, forming an integral part of the systems, which are covered by the subclass for the application, e.g. Fulltext... Hierarchy... Expanded...B41B, Fulltext... Hierarchy... Expanded...G06K, subject to those applications which are covered by this subclass;
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
Synchronising circuits with arrangements for extending range of synchronisation, e.g. by using switching between several time constants [2]
H04N 5/06
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Generation of synchronising signals
H04N 5/067
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Arrangements or circuits at the transmitter end [4]
H04N 5/073
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for mutually locking plural sources of synchronising signals, e.g. studios or relay stations [4]
H04N 5/08
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Separation of synchronising signals from picture signals
H04N 5/10
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Separation of line synchronising signal from frame synchronising signal
H04N 5/12
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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 generating by scanning motion picture films or slide opaques, e.g. for telecine (scanning details therefor Fulltext... Hierarchy... Expanded...H04N 3/36) [4]
Modifying the appearance of television pictures by optical filters or diffusing screens (optical filters or diffusing screens per seFulltext... Hierarchy... Expanded...G02B 5/00)
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 Fulltext... Hierarchy... Expanded...G02F)
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 Fulltext... Hierarchy... Expanded...H04N 9/67) [4]
H04N 9/78
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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
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Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback [4]
H04N 9/81
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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
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the recorded signal showing a feature, which is different in adjacent track parts, e.g. different phase or frequency [4]
H04N 9/85
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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
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the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system [4]
in which colour signals are inserted in the blanking interval of brightness signal [4]
H04N 11/12
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using simultaneous signals only [4]
H04N 11/14
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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
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the chrominance signal alternating in phase, e.g. PAL-system [4]
H04N 11/18
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using simultaneous and sequential signals, e.g. SECAM-system [4]
H04N 11/20
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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
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in which simultaneous signals are converted into sequential signals or vice versa [4]