IPC Main Group
H04R 3/00 Circuits for transducers
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
Scope Notes
Limiting references: Arrangements for producing a reverberation or echo sound Amplifiers | Application references: Circuits for combining the signals of two or more microphones or loudspeakers specially adapted for electric hearing aids
3 direct subcodes
Child Classifications
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