H04R - CPC Classification
Classification description:
Sub-classes:
- H04R1/00 » Details of transducers, {loudspeakers or microphones} 452
- H04R11/00 » Transducers of moving-armature or moving-core type 46
- H04R13/00 » Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet 41
- H04R15/00 » Magnetostrictive transducers 95
- H04R17/00 » Piezo-electric transducers; Electrostrictive transducers 1,5K
- H04R19/00 » Electrostatic transducers 122
- H04R21/00 » Variable-resistance transducers 2
- H04R2201/00 » Details of transducers, loudspeakers or microphones covered by but not provided for in any of its subgroups 3
- H04R2203/00 » Details of circuits for transducers, loudspeakers or microphones covered by but not provided for in any of its subgroups 25
- H04R2205/00 » Details of stereophonic arrangements covered by but not provided for in any of its subgroups 0
- H04R2207/00 » Details of diaphragms or cones for electromechanical transducers or their suspension covered by but not provided for in or in 33
- H04R2209/00 » Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by but not provided for in any of its subgroups 10
- H04R2217/00 » Details of magnetostrictive, piezo-electric, or electrostrictive transducers covered by or but not provided for in any of their subgroups 14
- H04R2225/00 » Details of deaf aids covered by , not provided for in any of its subgroups 5
- H04R2227/00 » Details of public address [PA] systems covered by but not provided for in any of its subgroups 6
- H04R2231/00 » Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by , not provided for in its subgroups 18
- H04R23/00 » Transducers other than those covered by groups to 227
- H04R2307/00 » Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by or , not provided for in any of its subgroups 9
- H04R2400/00 » Loudspeakers 75
- H04R2410/00 » Microphones 213
- H04R2420/00 » Details of connection covered by , not provided for in its groups 26
- H04R2430/00 » Signal processing covered by , not provided for in its groups 94
- H04R2440/00 » Bending wave transducers covered by , not provided for in its groups 5
- H04R2460/00 » Details of hearing devices, i.e. of ear- or headphones covered by or but not provided for in any of their subgroups, or of hearing aids covered by but not provided for in any of its subgroups 7
- H04R2499/00 » Aspects covered by or not otherwise provided for in their subgroups 2
- H04R25/00 » Deaf-aid sets {providing an auditory perception; Electric tinnitus maskers providing an auditory perception} 565
- H04R27/00 » Public address systems 2,1K
- H04R29/00 » Monitoring arrangements; Testing arrangements 1,0K
- H04R3/00 » Circuits for transducers {, loudspeakers or microphones} 3,6K
- H04R31/00 » Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor 1,0K
- H04R5/00 » Stereophonic arrangements 173
- H04R7/00 » Diaphragms for electromechanical transducers ; Cones 70
- H04R9/00 » Transducers of moving-coil, moving-strip, or moving-wire type 46
