| G | SK | PHYSICS |
| G08 | KL | SIGNALLING (indicating or display devices per se G09F; transmission of pictures H04N) |
| G08C | UKL | TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmission systems F15B; sensing members for specific physical variables, see the relevant subclasses, e.g. of G01 , of H01; indicators or recorders, see the relevant subclasses, e.g. G01D , G09F; mechanical means for transferring the output of a sensing member into a different variable G01D 5/00; self-balancing bridges G01R; position control in general G05D 3/00; mechanical control systems G05G; systems for transmitting "on/off" signals only, systems for transmitting alarm conditions G08B; order telegraph systems G08B 9/00; generating electric pulses H03K; coding, decoding or code conversion, in general H03M; transmission of digital information H04L; selective calling from one station to another H04Q 9/00) [4] |
| G08C 13/00 | HGR | Arrangements for influencing the relationship between signals at input and output, e.g. differentiating, delaying (transferring the output of a sensing member to measuring arrangements giving results not yielding momentary value G01D 1/00; systems for control of position involving comparison between actual and desired values G05D 3/00; computing in general G06) |
| G08C 13/02 | UGR1 | | . | to yield a signal which is a function of two or more signals, e.g. sum, product |
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| G08C 15/00 | HGR | Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path (multiplex transmission in general H04J) |
| G08C 15/02 | UGR1 | | . | simultaneously, i.e. using frequency division |
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| G08C 15/04 | UGR2 | | . . | the signals being modulated on carrier frequencies |
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| G08C 15/06 | UGR1 | | . | successively, i.e. using time division |
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| G08C 15/08 | UGR2 | | . . | the signals being represented by amplitude of current or voltage in transmission link |
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| G08C 15/10 | UGR2 | | . . | the signals being represented by frequencies or phase of current or voltage in transmission link |
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| G08C 15/12 | UGR2 | | . . | the signals being represented by pulse characteristics in transmission link |
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| G08C 17/00 | HGR | Arrangements for transmitting signals characterised by the use of a wireless electrical link [6] |
| G08C 17/02 | UGR1 | |
| G08C 17/04 | UGR1 | | . | using magnetically coupled devices [6] |
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| G08C 17/06 | UGR1 | | . | using capacity coupling [6] |
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| G08C 19/00 | HGR | Electric signal transmission systems (G08C 17/00 takes precedence) |
| G08C 19/02 | UGR1 | | . | in which the signal transmitted is magnitude of current or voltage (G08C 19/36 , G08C 19/38 take precedence) |
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| G08C 19/04 | UGR2 | | . . | using variable resistance |
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| G08C 19/06 | UGR2 | | . . | using variable inductance |
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| G08C 19/08 | UGR3 | | . . . | differentially influencing two coils |
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| G08C 19/10 | UGR2 | | . . | using variable capacitance |
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| G08C 19/12 | UGR1 | | . | in which the signal transmitted is frequency or phase of ac |
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| G08C 19/14 | UGR2 | | . . | using combination of fixed frequencies |
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| G08C 19/16 | UGR1 | | . | in which transmission is by pulses |
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| G08C 19/18 | UGR2 | | . . | using a variable number of pulses in a train |
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| G08C 19/20 | UGR3 | | . . . | operating on dynamo-electric devices, e.g. step motor |
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| G08C 19/22 | UGR2 | | . . | by varying the duration of individual pulses |
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| G08C 19/24 | UGR2 | | . . | using time shift of pulses |
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| G08C 19/26 | UGR2 | | . . | by varying pulse repetition frequency |
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| G08C 19/28 | UGR2 | |
| G08C 19/30 | UGR1 | | . | in which transmission is by selection of one or more conductors or channels from a plurality of conductors or channels (G08C 19/38 takes precedence) |
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| G08C 19/32 | UGR2 | | . . | of one conductor or channel |
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| G08C 19/34 | UGR2 | | . . | of a combination of conductors or channels |
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| G08C 19/36 | UGR1 | | . | using optical means to convert the input signal (analogue/digital conversion per se H03M 1/00) |
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| G08C 19/38 | UGR1 | | . | using dynamo-electric devices (operated by pulses G08C 19/20; dynamo-electric machines per se H02K) |
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| G08C 19/40 | UGR2 | | . . | of which only the rotor or the stator carries a winding to which a signal is applied, e.g. using step motor |
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| G08C 19/42 | UGR3 | | . . . | having three stator poles |
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| G08C 19/44 | UGR3 | | . . . | having more than three stator poles |
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| G08C 19/46 | UGR2 | | . . | of which both rotor and stator carry windings (having squirrel-cage rotor G08C 19/40) |
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| G08C 19/48 | UGR3 | | . . . | being of the type with a three-phase stator and a rotor fed by constant-frequency ac, e.g. selsyn, magslip |
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| G08C 21/00 | HGR | Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system (converting the pattern of mechanical parameters, e.g. force or presence, into electrical signals G06K 11/00) [5] |
| G08C 23/00 | HGR | Non-electric signal transmission systems, e.g. optical systems |
| G08C 23/02 | UGR1 | | . | using acoustic waves [6] |
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| G08C 23/04 | UGR1 | | . | using light waves, e.g. infra-red [6] |
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| G08C 23/06 | UGR2 | | . . | through light guides, e.g. optical fibres [6] |
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| G08C 25/00 | HGR | Arrangements for preventing or correcting errors; Monitoring arrangements |
| G08C 25/02 | UGR1 | | . | by signalling back from receiving station to transmitting station |
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| G08C 25/04 | UGR1 | | . | by recording transmitted signals |
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