DIFF Subgroup
H04N 5/57 Control of contrast or brightness
Introduced: January 1985
Full Title
Full titles differ between systems:
IPC:
Details of television systems > Receiver circuitry > Control of contrast or brightness
CPC:
Details of television systems (scanning details or combination thereof with generation of supply voltages H04N3/00) > Receiver circuitry (H04N5/14 takes precedence) > Control of contrast or brightness
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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- H04N 5/59 in dependence upon beam current of cathode ray tube since 1985 IPC+CPC Available in IPC and CPC