LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS

HELECTRICITY H04Electric communication

H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS

H04R1/00Details of transducers, loudspeakers or microphones H04R11/00Transducers of moving-armature or moving-core type H04R13/00Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet H04R15/00Magnetostrictive transducers H04R17/00Piezo-electric transducers Electrostrictive transducers H04R19/00Electrostatic transducers H04R21/00Variable-resistance transducers H04R2201/00Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups H04R2203/00Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups H04R2205/00Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups H04R2207/00Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00 H04R2209/00Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups H04R2217/00Details of magnetostrictive, piezo-electric, or electrostrictive transducers covered by H04R15/00 or H04R17/00 but not provided for in any of their subgroups H04R2225/00Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups H04R2227/00Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups H04R2231/00Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups H04R23/00Transducers other than those covered by groups H04R9/00 - H04R21/00 H04R2307/00Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups H04R2400/00Loudspeakers H04R2410/00Microphones H04R2420/00Details of connection covered by H04R, not provided for in its groups H04R2430/00Signal processing covered by H04R, not provided for in its groups H04R2440/00Bending wave transducers covered by H04R, not provided for in its groups H04R2460/00Details of hearing devices H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups H04R25/00Deaf-aid sets providing an auditory perception; Electric tinnitus maskers providing an auditory perception H04R27/00Public address systems H04R29/00Monitoring arrangements Testing arrangements H04R3/00Circuits for transducers , loudspeakers or microphones H04R31/00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor H04R5/00Stereophonic arrangements H04R7/00Diaphragms for electromechanical transducers Cones H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type