DIFF Subgroup
H04H 20/77 using carrier waves
Introduced: January 2008
Full Title
Arrangements for broadcast or for distribution combined with broadcast > Arrangements characterised by transmission systems for broadcast > Wired systems > using carrier waves
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
IPC defines codes here since 2008.
Child Classifications
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- H04H 20/80 having frequencies in two or more frequency bands, e.g. medium wave and VHF since 2008 IPC+CPC Available in IPC and CPC
- H04H 20/81 combined with telephone network over which the broadcast is continuously available since 2008 IPC+CPC Available in IPC and CPC