CPC Main Group
H04R 11/00 Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly coacting with electromagnet H04R13/00)
5 direct subcodes
Child Classifications
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- H04R 11/02 Loudspeakers
- H04R 11/04 Microphones
- H04R 11/06 Telephone receivers
- H04R 11/08 Gramophone pick-ups using a stylus; Recorders using a stylus
- H04R 11/14 Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency