DIFF Main Group
H04S 3/00 Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Systems employing more than two channels, e.g. quadraphonic
CPC: Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
Full Title
Full titles differ between systems:
IPC:
Systems employing more than two channels, e.g. quadraphonic
CPC:
Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
CPC subdivides this area 4x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- H04S 3/02 of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other since 1980 IPC+CPC Available in IPC and CPC