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CPC Definition - Subclass H03J

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Last Updated Version: 2023.01
H03J
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
Definition statement

This place covers:

  • tuning of resonating circuits, in particular RLC circuits in which the inductance and/or the capacitance is controlled;
  • this subclass also covers the control of tuning, including the combined control of tuning and other functions, e.g. combinations of tuning control and volume control, combinations of control of local oscillator circuits and of supplementary resonant circuits.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Indicating arrangements for measuring

G01D

Measuring, testing

G01R

Control in general

G05

Signalling

G08

Resonator consisting of distributed elements

H01P

Antennas

H01Q

Oscillators

H03B

Filters comprising lumped elements

H03H

Automatic control or stabilisation of generators

H03L

Radio receiver circuits

H04B

Calibrating and monitoring of receivers and transmitters

H04B 17/00

Television receiver circuits

H04N

Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
Definition statement

This place covers:

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Machine elements in general

F16

Couplings for transmitting rotation

F16D

Continuous tuning (H03J 7/00, H03J 9/00 take precedence; combination of continuous and discontinuous tuning other than for bandspreading H03J 5/00)
Definition statement

This place covers:

Tuned circuits in which the tuning (or control) signal is continuously applied to the resonating circuit.

References
Limiting references

This place does not cover:

Combination of continuous and discontinuous tuning other than for bandspreading

H03J 5/00

Automatic frequency control; Automatic scanning over a band of frequencies

H03J 7/00

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification

H03J 9/00

Arrangements for compensating for variations of physical values, e.g. temperature
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Controlling non-electric variables

G05D

Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Automatic gain control

H03G

Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner (H03J 7/00, H03J 9/00 take precedence; for bandspreading H03J 3/10)
Definition statement

This place covers:

  • Tuned circuits in which the tuning (or control) signal is not continuously applied to the resonating circuit;
  • Radio frequency filters used for bandswitching in receivers and transmitters.
References
Limiting references

This place does not cover:

Tuning for bandspreading

H03J 3/10

Automatic frequency control; Automatic scanning over a band of frequencies

H03J 7/00

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification

H03J 9/00

with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Electric switches in general

H01H

Automatic frequency control; Automatic scanning over a band of frequencies
Definition statement

This place covers:

  • Automatic frequency control circuits, such as used in radio and television receivers: H03J 7/02 - H03J 7/16;
  • Automatic scanning over a band of frequencies, with or without mircrocomputer controlled circuits: H03J 7/18 - H03J 7/32.
References
Limiting references

This place does not cover:

Automatic frequency control (H03J 7/18 takes precedence)

H03J 7/02

Informative references

Attention is drawn to the following places, which may be of interest for search:

Automatic tuning control for television receivers

H04N 5/50

Automatic frequency control (H03J 7/18 takes precedence)
References
Limiting references

This place does not cover:

Automatic scanning over a band of frequencies

H03J 7/18

Informative references

Attention is drawn to the following places, which may be of interest for search:

Automatic tuning control for television receivers

H04N 5/50

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification (mechanical remote-control arrangements H03J 1/00 {; using a microprocessor H03J 1/0025; constructional details of remote control switching devices H01H 9/0235})
Definition statement

This place covers:

Remote control of tuned circuits such as used in television and radio receivers and consumer electronics in general.

References
Limiting references

This place does not cover:

Mechanical remote-control arrangements

H03J 1/00

Using a microprocessor

H03J 1/0025

Constructional details of remote control switching devices

H01H 9/0235

Informative references

Attention is drawn to the following places, which may be of interest for search:

Universal remote controls

H04B 1/20

Remote control of television receivers

H04N

Housing of remote controls

H05K 9/00