Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Circuits for transducers

CPC: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)

Full titles differ between systems:

IPC:

Circuits for transducers

CPC:

Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)

Arrangements for producing a reverberation or echo sound Amplifiers

Circuits for combining the signals of two or more microphones or loudspeakers specially adapted for electric hearing aids

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

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H04R 3/002 CPC only CPC only
H04R 3/005 CPC only CPC only
H04R 3/007 CPC only CPC only
H04R 3/02 for preventing acoustic reaction IPC+CPC Available in IPC and CPC
H04R 3/04 for correcting frequency response IPC+CPC Available in IPC and CPC
H04R 3/12 for distributing signals to two or more loudspeakers IPC+CPC Available in IPC and CPC

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

Class H04,2013–2023, worldwide · Source: EPO PATSTAT