|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G08 |
SIGNALLING (indicating or display devices per se Fulltext... Hierarchy... Expanded...G09F; transmission of pictures Fulltext... Hierarchy... Expanded...H04N; arrangements for selective calling from one station to another Fulltext... Hierarchy... Expanded...H04Q 9/00)

|  | G08C |
SIGNAL TRANSMISSION SYSTEMS (hydraulic transmission systems Fulltext... Hierarchy... Expanded...F15B; transducers for specific physical variables, see the relevant sub-classes, e.g. of Fulltext... Hierarchy... Expanded...G01, of Fulltext... Hierarchy... Expanded...H01; indicators or recorders, see the relevant sub-classes, e.g. Fulltext... Hierarchy... Expanded...G01D, Fulltext... Hierarchy... Expanded...G09F; arrangements for transmission of measured values Fulltext... Hierarchy... Expanded...G01D 5/00; self-balancing bridges Fulltext... Hierarchy... Expanded...G01R; mechanical control systems Fulltext... Hierarchy... Expanded...G05G; systems for transmitting "on/off" signals only, systems for transmitting alarm conditions Fulltext... Hierarchy... Expanded...G08B; non-electric order telegraph systems Fulltext... Hierarchy... Expanded...G08B 9/00; generating, coding or decoding electric pulses Fulltext... Hierarchy... Expanded...H03K; radio or line transmission systems in general Fulltext... Hierarchy... Expanded...H04B; telegraph systems Fulltext... Hierarchy... Expanded...H04L; selective calling from one station to another Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...G01D 1/00; systems for control of position involving comparison between actual and desired values Fulltext... Hierarchy... Expanded...G05D 3/00; computing in general Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...G08C 19/36, Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...G08C 9/00, Fulltext... Hierarchy... Expanded...H03K)

|  | G08C 19/38 |
· | using dynamo-electric devices (operated by pulses Fulltext... Hierarchy... Expanded...G08C 19/20; dynamo-electric machines per se Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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