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IPC6

SECTION G - PHYSICS

TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR...

G08C

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G 08 C

TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmission systems F 15 B; sensing members for specific physical variables, see the relevant subclasses, e.g. of G 01, of H 01; indicators or recorders, see the relevant subclasses, e.g. G 01 D, G 09 F; mechanical means for transferring the output of a sensing member into a different variable G 01 D 5/00; self-balancing bridges G 01 R; position control in general G 05 D 3/00; mechanical control systems G 05 G; systems for transmitting "on/off" signals only, systems for transmitting alarm conditions G 08 B; order telegraph systems G 08 B 9/00; generating electric pulses H 03 K; coding, decoding or code conversion, in general H 03 M; transmission of digital information H 04 L; selective calling from one station to another H 04 Q 9/00) [4]

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 G 01 D 1/00; systems for control of position involving comparison between actual and desired values G 05 D 3/00; computing in general G 06)

to yield a signal which is a function of two or more signals, e.g. sum, product

Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path (multiplex transmission in general H 04 J)

simultaneously, i.e. using frequency division

the signals being modulated on carrier frequencies

successively, i.e. using time division

the signals being represented by amplitude of current or voltage in transmission link

the signals being represented by frequencies or phase of current or voltage in transmission link

the signals being represented by pulse characteristics in transmission link

Arrangements for transmitting signals characterised by the use of a wireless electrical link [6]

using a radio link [6]

using magnetically coupled devices [6]

using capacity coupling [6]

Electric signal transmission systems (G 08 C 17/00 takes precedence)

in which the signal transmitted is magnitude of current or voltage (G 08 C 19/36, G 08 C 19/38 take precedence)

using variable resistance

using variable inductance

differentially influencing two coils

using variable capacitance

in which the signal transmitted is frequency or phase of ac

using combination of fixed frequencies

in which transmission is by pulses

using a variable number of pulses in a train

operating on dynamo-electric devices, e.g. step motor

by varying the duration of individual pulses

using time shift of pulses

by varying pulse repetition frequency

using pulse code

in which transmission is by selection of one or more conductors or channels from a plurality of conductors or channels (G 08 C 19/38 takes precedence)

of one conductor or channel

of a combination of conductors or channels

using optical means to convert the input signal (analogue/digital conversion per se H 03 M 1/00)

using dynamo-electric devices (operated by pulses G 08 C 19/20; dynamo-electric machines per se H 02 K)

of which only the rotor or the stator carries a winding to which a signal is applied, e.g. using step motor

having three stator poles

having more than three stator poles

of which both rotor and stator carry windings (having squirrel-cage rotor G 08 C 19/40)

being of the type with a three-phase stator and a rotor fed by constant-frequency ac, e.g. selsyn, magslip

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 G 06 K 11/00) [5]

Non-electric signal transmission systems, e.g. optical systems

using acoustic waves [6]

using light waves, e.g. infra-red [6]

through light guides, e.g. optical fibres [6]

Arrangements for preventing or correcting errors; Monitoring arrangements

by signalling back from receiving station to transmitting station

by recording transmitted signals