G
SECTION G — PHYSICS
  
INSTRUMENTS
 G08
SIGNALLING (indicating or display devices per se G09F; transmission of pictures H04N; arrangements for selective calling from one station to another H04Q 9/00)
 G08C
SIGNAL TRANSMISSION SYSTEMS (hydraulic transmission systems F15B; transducers for specific physical variables, see the relevant sub-classes, e.g. of G01, of H01; indicators or recorders, see the relevant sub-classes, e.g. G01D, G09F; arrangements for transmission of measured values G01D 5/00; self-balancing bridges G01R; mechanical control systems G05G; systems for transmitting "on/off" signals only, systems for transmitting alarm conditions G08B; non-electric order telegraph systems G08B 9/00; generating, coding or decoding electric pulses H03K; radio or line transmission systems in general H04B; telegraph systems H04L; selective calling from one station to another H04Q 9/00)
 G08C

Note(s)

This sub-class deals only with systems for transmitting values of a variable, in which the parameter used for the transmission differs from that of the variable

 G08C 9/00
Devices for representing the variable to be transmitted in digital form, e.g. disc converter
 G08C 9/02
·  Capacitive or electrostatic devices
 G08C 9/04
·  Magnetic or inductive devices
 G08C 9/06
·  Photoelectric devices
 G08C 9/08
·  using electric contacts; using coded patterns of electric contacts; using coded patterns of both conductive and non-conductive strips
 G08C 11/00
Devices for representing in mechanical form each of the signals which a particular digital electric transmission system is prepared to handle, e.g. for decoding
 G08C 13/00
Arrangements for influencing the relationship between signals at input and output, e.g. differentiating, delaying (transferring the output of a sensing member to an indicating or recording part 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
·  to yield a signal which is a function of two or more signals, e.g. sum, product
 G08C 15/00
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
·  simultaneously, i.e. using frequency division
 G08C 15/04
·  ·  the signals being modulated on carrier frequencies
 G08C 15/06
·  successively, i.e. using time division
 G08C 15/08
·  ·  the signals being represented by amplitude of current or voltage in transmission link
 G08C 15/10
·  ·  the signals being represented by frequencies or phase of current or voltage in transmission link
 G08C 15/12
·  ·  the signals being represented by pulse characteristics in transmission link
 G08C 17/00
Arrangements for transmitting signals characterised by the use of a radio link
 G08C 19/00
Electric signal transmission systems
 G08C 19/02
·  in which the variable transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence)
 G08C 19/04
·  ·  using variable resistance
 G08C 19/06
·  ·  using variable inductance
 G08C 19/08
·  ·  ·  differentially influencing two coils
 G08C 19/10
·  ·  using variable capacitance
 G08C 19/12
·  in which the variable transmitted is frequency or phase of ac
 G08C 19/14
·  ·  using combination of fixed frequencies
 G08C 19/16
·  in which transmission is by pulses
 G08C 19/18
·  ·  using a variable number of pulses in a train
 G08C 19/20
·  ·  ·  operating on dynamo-electric devices, e.g. step motor
 G08C 19/22
·  ·  by varying the duration of individual pulses
 G08C 19/24
·  ·  using time shift of pulses
 G08C 19/26
·  ·  by varying pulse repetition frequency
 G08C 19/28
·  ·  using pulse code
 G08C 19/30
·  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)
 G08C 19/32
·  ·  of one conductor or channel
 G08C 19/34
·  ·  of a combination of conductors or channels
 G08C 19/36
·  using optical means to convert the input signal (analogue /digital converters per se G08C 9/00, H03K)
 G08C 19/38
·  using dynamo-electric devices (operated by pulses G08C 19/20; dynamo-electric machines per se H02K)
 G08C 19/40
·  ·  of which only the rotor or the stator carries a winding to which a signal is applied, e.g. using step motor
 G08C 19/42
·  ·  ·  having three stator poles
 G08C 19/44
·  ·  ·  having more than three stator poles
 G08C 19/46
·  ·  of which both rotor and stator carry windings (having squirrel-cage rotor G08C 19/40)
 G08C 19/48
·  ·  ·  being of the type with a three-phase stator and a rotor fed by constant-frequency ac, e.g. selsyn, magslip
 G08C 21/00
Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system
 G08C 23/00
Non-electric signal transmission systems
 G08C 25/00
Arrangements for preventing or correcting errors; Monitoring arrangements
 G08C 25/02
·  by signalling back from receiving station to transmitting station
 G08C 25/04
·  by recording transmitted signals