DIFF Subgroup
H04H 20/89 using three or more audio channels, e.g. triphonic or quadraphonic
Introduced: January 2008
Full Title
Full titles differ between systems:
IPC:
Arrangements for broadcast or for distribution combined with broadcast > Arrangements characterised by special technical features of the broadcast information, e.g. signal form or information format > Stereophonic broadcast systems > using three or more audio channels, e.g. triphonic or quadraphonic
CPC:
Arrangements for broadcast or for distribution combined with broadcast > Arrangements characterised by the broadcast information itself > Stereophonic broadcast systems > using three or more audio channels, e.g. triphonic or quadraphonic
No child classifications to compare. This is a leaf node in both IPC and CPC.