This sub-class deals with the 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. the analysis of the whole of a picture-containing area by resolving it into an area or a plurality of areas of which at least one of the two dimensions is elemental, simultaneously or in a sequence, and the derivation in response thereto of a picture-representative electric signal;
Step (b): the reproduction of the whole of a picture-containing area by the reproduction in response to a picture-representative electric signal of an area or a plurality of areas of which at least one of the two dimensions is elemental, simultaneously or in sequence.
In this sub-class, "pictorial communication systems" are those systems for the transmission and reproduction of arbitrarily composed pictures 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).
In this sub-class, "television systems" are 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.
This sub-class includes circuits specially designed for dealing with television or pictorial communication signals, as distinct from merely signals of a particular frequency range.
This sub-class does not include the following subject matter:
Systems in which legible alphanumeric or like character forms are analysed according to Step (a) to derive an electric signal from which the character is recognised by comparison with stored information, which are dealt with in 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 Step (a) and employed to modify the operation of the system, which are dealt with in Fulltext... Hierarchy... Expanded...G03.
Systems for the reproduction according to Step (b) of pictures comprising alphanumeric or like character forms but involving the production of the equivalent of a signal which would be derived by Step (a), e.g. by cams, punched card or tape, coded control signal, or other means, which are dealt with in the sub-class for the application, e.g. Fulltext... Hierarchy... Expanded...G01D, Fulltext... Hierarchy... Expanded...G06F, Fulltext... Hierarchy... Expanded...H04L.
Systems involving Step (a) or Step (b) for producing (1) engraved, indented, apertured, or otherwise formed printing surfaces, or (2) photographs specially arranged for producing such printing surfaces or for use generally in printing or duplication, which are dealt with in Fulltext... Hierarchy... Expanded...G03F.
Systems for the reproduction according to Step (b) of pictures comprising alphanumeric or like character forms and involving the generation according to 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, are dealt with in the sub-class for the application, e.g. Fulltext... Hierarchy... Expanded...G06K, Fulltext... Hierarchy... Expanded...H04N.
H04N 1/00
Pictorial communication, e.g. facsimile transmission
H04N 1/02
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System details, e.g. signal generator, signal reproducer
H04N 1/04
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Scanning arrangements
H04N 1/06
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using cylindrical picture-bearing surfaces
H04N 1/08
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Mechanisms for mounting or holding the sheet around the drum
H04N 1/10
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using flat picture-bearing surfaces
H04N 1/12
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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
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the scanning speed being dependent on content of picture [2]
H04N 1/18
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arranged for simultaneous transmission of separate parts of one picture
H04N 1/20
· · ·
arranged for simultaneous transmission of two or more separate pictures
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 5/08
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Separation of synchronising signals from picture signals
H04N 5/10
· · ·
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]
Modifying the appearance of television pictures by optical filters or diffusing screens (optical filters or diffusing screens per seFulltext... Hierarchy... Expanded...G02B 5/00)
Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
H04N 7/06
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Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier
H04N 7/08
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Systems for the transmission of more than one television signal simultaneously or sequentially, the signals occupying wholly or partially the same frequency band
Systems in which the picture signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the picture signal (by special scanning Fulltext... Hierarchy... Expanded...H04N 3/00)
H04N 7/14
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Systems for two-way working
H04N 7/16
·
Secrecy systems; Subscription systems
H04N 7/18
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Closed-circuit television systems, i.e. systems in which the signal is not broadcast
in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. N. T. S. C. system
H04N 9/39
· · · · ·
the colour signal alternating in phase, e.g. PAL system [2]
H04N 9/40
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using simultaneous and sequential signals, e.g. S. E. C. A. M. system
H04N 9/42
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in which simultaneous signals are converted into sequential signals or vice versa