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IPC 7
G08C-G08C02504

SECTION G – PHYSICS


G 08SIGNALLING (indicating or display devices per se G09F; transmission of pictures H04N)


G 08 CTRANSMISSION 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]


Subclass Index

TRANSMISSION SYSTEMS IN GENERAL 

Electric; non-electric 

G08C 19/00; G08C 23/00 

SYSTEMS FOR TRANSMITTING THE POSITION OF AN OBJECT 

G08C 21/00 

ARRANGEMENTS CHARACTERISED BY THE METHOD OF TRANSMISSION 

Multiplex; use of a wireless electrical link 

G08C 15/00; G08C 17/00 

PROCESSING SIGNALS 

Differentiating, delaying 

G08C 13/00 

MONITORING, PREVENTING OR CORRECTING ERRORS 

G08C 25/00 



13/

00Arrangements 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)

13/

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


15/

00Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path (multiplex transmission in general H04J)

15/

02.simultaneously, i.e. using frequency division

15/

04..the signals being modulated on carrier frequencies

15/

06.successively, i.e. using time division

15/

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

15/

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

15/

12..the signals being represented by pulse characteristics in transmission link


17/

00Arrangements for transmitting signals characterised by the use of a wireless electrical link  [6]

17/

02.using a radio link  [6]

17/

04.using magnetically coupled devices  [6]

17/

06.using capacity coupling  [6]


19/

00Electric signal transmission systems (G08C 17/00 takes precedence)

19/

02.in which the signal transmitted is magnitude of current or voltage (G08C 19/36, G08C 19/38 take precedence)

19/

04..using variable resistance

19/

06..using variable inductance

19/

08...differentially influencing two coils

19/

10..using variable capacitance

19/

12.in which the signal transmitted is frequency or phase of ac

19/

14..using combination of fixed frequencies

19/

16.in which transmission is by pulses

19/

18..using a variable number of pulses in a train

19/

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

19/

22..by varying the duration of individual pulses

19/

24..using time shift of pulses

19/

26..by varying pulse repetition frequency

19/

28..using pulse code

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)

19/

32..of one conductor or channel

19/

34..of a combination of conductors or channels

19/

36.using optical means to convert the input signal (analogue/digital conversion per se H03M 1/00)

19/

38.using dynamo-electric devices (operated by pulses G08C 19/20; dynamo-electric machines per se H02K)

19/

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

19/

42...having three stator poles

19/

44...having more than three stator poles

19/

46..of which both rotor and stator carry windings (having squirrel-cage rotor G08C 19/40)

19/

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


21/

00Systems 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]


23/

00Non-electric signal transmission systems, e.g. optical systems

23/

02.using acoustic waves  [6]

23/

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

23/

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


25/

00Arrangements for preventing or correcting errors; Monitoring arrangements

25/

02.by signalling back from receiving station to transmitting station

25/

04.by recording transmitted signals


  
 

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