H04R1/00	7	Details of transducers, {loudspeakers or microphones}	H04R1/00	H04R1/00		1062
H04R1/005	8	{using digitally weighted transducing elements}	H04R1/00	H04R1/00		286
H04R1/02	8	Casings; Cabinets {; Supports therefor;} Mountings therein (H04R1/28 takes precedence {; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075})	H04R1/02	H04R1/02		6894
H04R1/021	9	{incorporating only one transducer}	H04R1/02	H04R1/02		1318
H04R1/023	9	{Screens for loudspeakers}	H04R1/02	H04R1/02		1797
H04R1/025	9	{Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture}	H04R1/02	H04R1/02		5343
H04R1/026	9	{Supports for loudspeaker casings}	H04R1/02	H04R1/02		2387
H04R1/028	9	{associated with devices performing functions other than acoustics, e.g. electric candles}	H04R1/02	H04R1/02		5884
H04R1/04	9	Structural association of microphone with electric circuitry therefor (in electric hearing aids H04R25/00)	H04R1/04	H04R1/04		2042
H04R1/06	8	Arranging circuit leads; Relieving strain on circuit leads	H04R1/06	H04R1/06		1543
H04R1/08	8	Mouthpieces; {Microphones;} Attachments therefor	H04R1/08	H04R1/08		6015
H04R1/083	9	{Special constructions of mouthpieces}	H04R1/08	H04R1/08		2051
H04R1/086	10	{Protective screens, e.g. all weather or wind screens}	H04R1/08	H04R1/08		1070
H04R1/10	8	Earpieces; Attachments therefor {; Earphones; Monophonic headphones (H04R1/28 takes precedence; stereophonic headphones H04R5/033)}<br><br><u>NOTE</u><br><br>This group covers details of headphones, both of monophonic and stereophonic type. <br>When classifying in this group or in its subgroups, aspects relating to stereophonic headphones are to be classified in H04R5/033 as well.	H04R1/10	H04R1/10		5390
H04R1/1008	9	{Earpieces of the supra-aural or circum-aural type}	H04R1/10	H04R1/10		3741
H04R1/1016	9	{Earpieces of the intra-aural type}	H04R1/10	H04R1/10		6057
H04R1/1025	9	Accumulators specially adapted for earpieces; Arrangements specially adapted for charging thereof	H04R1/1025	H04R1/1025		2903
H04R1/1033	9	{Cables or cables storage, e.g. cable reels (cord reels per seH02G11/02; arrangements for storing and repeatedly paying-out and re-storing lengths of conductors or cables B65H75/34; extensible conductors or cables, e.g. self-coiling cords H01B7/06)}	H04R1/10	H04R1/10		2551
H04R1/1041	9	{Mechanical or electronic switches, or control elements (switches in general H01H)}	H04R1/10	H04R1/10		7363
H04R1/105	9	{Earpiece supports, e.g. ear hooks (for stereophonic headphones H04R5/0335)}	H04R1/10	H04R1/10		2913
H04R1/1058	9	{Manufacture or assembly}	H04R1/10	H04R1/10		2447
H04R1/1066	10	{Constructional aspects of the interconnection between earpiece and earpiece support (earpiece support for monophonic headphones H04R1/105; earpiece support for stereophonic headphones H04R5/0335)}	H04R1/10	H04R1/10		1995
H04R1/1075	10	{Mountings of transducers in earphones or headphones}	H04R1/10	H04R1/10		1932
H04R1/1083	9	{Reduction of ambient noise (active noise reduction per seG10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06)}	H04R1/10	H04R1/10		4422
H04R1/1091	9	{Details not provided for in groups H04R1/1008&#160;-&#160;H04R1/1083}	H04R1/10	H04R1/10		4075
H04R1/12	8	Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection	H04R1/12	H04R1/12		1140
H04R1/14	8	Throat mountings for microphones	H04R1/14	H04R1/14		216
H04R1/16	8	Mounting or connecting stylus to transducer with or without damping means	H04R1/16	H04R1/16		445
H04R1/18	9	Holders for styli; Mounting holders on transducers	H04R1/18	H04R1/18		120
H04R1/20	8	Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00)	H04R1/20	H04R1/20		2528
H04R1/22	9	for obtaining desired frequency characteristic only&#160; {(circuit for combining transducers having different responses&#160;H04R3/00; for hearing aids&#160;H04R25/407)}	H04R1/22	H04R1/22		1001
H04R1/222	10	{for microphones (H04R1/24, H04R1/26 take precedence)}	H04R1/22	H04R1/22		625
H04R1/225	10	{for telephonic receivers}	H04R1/22	H04R1/22		415
H04R1/227	10	{using transducers reproducing the same frequency band}	H04R1/22	H04R1/22		450
H04R1/24	10	Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges	H04R1/24	H04R1/24		1727
H04R1/245	11	{of microphones}	H04R1/24	H04R1/24		125
H04R1/26	10	Spatial arrangements of separate transducers responsive to two or more frequency ranges	H04R1/26	H04R1/26		1756
H04R1/265	11	{of microphones}	H04R1/26	H04R1/26		91
H04R1/28	10	Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means {(combinations of transducers with horns, i.e. front-loaded horns H04R1/30)}	H04R1/28	H04R1/28		833
H04R1/2803	11	{for loudspeaker transducers}	H04R1/28	H04R1/28		805
H04R1/2807	11	{Enclosures comprising vibrating or resonating arrangements (for the reduction of undesired resonances or vibrations H04R1/2869)}	H04R1/28	H04R1/28		374
H04R1/2811	12	{for loudspeaker transducers}	H04R1/28	H04R1/28		1490
H04R1/2815	12	{of the bass reflex type}	H04R1/28	H04R1/28		69
H04R1/2819	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		875
H04R1/2823	13	{Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material}	H04R1/28	H04R1/28		159
H04R1/2826	14	{for loudspeaker transducers}	H04R1/28	H04R1/28		696
H04R1/283	12	{using a passive diaphragm}	H04R1/28	H04R1/28		74
H04R1/2834	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		800
H04R1/2838	12	{of the bandpass type}	H04R1/28	H04R1/28		55
H04R1/2842	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		515
H04R1/2846	13	{Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material}	H04R1/28	H04R1/28		94
H04R1/2849	14	{for loudspeaker transducers}	H04R1/28	H04R1/28		244
H04R1/2853	12	{using an acoustic labyrinth or a transmission line}	H04R1/28	H04R1/28		135
H04R1/2857	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		621
H04R1/2861	12	{using a back-loaded horn}	H04R1/28	H04R1/28		27
H04R1/2865	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		226
H04R1/2869	11	{Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself}	H04R1/28	H04R1/28		279
H04R1/2873	12	{for loudspeaker transducers}	H04R1/28	H04R1/28		440
H04R1/2876	12	{by means of damping material, e.g. as cladding (damping material for tuning desired resonances H04R1/2807, e.g. in vents H04R1/2823, H04R1/2846)}	H04R1/28	H04R1/28		238
H04R1/288	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		938
H04R1/2884	12	{by means of the enclosure structure, i.e. strengthening or shape of the enclosure}	H04R1/28	H04R1/28		107
H04R1/2888	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		573
H04R1/2892	12	{Mountings or supports for transducers}	H04R1/28	H04R1/28		100
H04R1/2896	13	{for loudspeaker transducers}	H04R1/28	H04R1/28		397
H04R1/30	10	Combinations of transducers with horns, e.g. with mechanical matching means {, i.e. front-loaded horns}(horns in general G10K; {transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345})	H04R1/30	H04R1/30		1289
H04R1/32	9	for obtaining desired directional characteristic only {(specially adapted for hearing aids H04R25/40)}	H04R1/32	H04R1/32		451
H04R1/323	10	{for loudspeakers (H04R1/34 and H04R1/40 take precedence)}	H04R1/32	H04R1/32		1491
H04R1/326	10	{for microphones (H04R1/34 and H04R1/40 take precedence)}	H04R1/32	H04R1/32		762
H04R1/34	10	by using a single transducer with sound reflecting, diffracting, directing or guiding means {(specially adapted for hearing aids H04R25/402)}	H04R1/34	H04R1/34		403
H04R1/342	11	{for microphones}	H04R1/34	H04R1/34		628
H04R1/345	11	{for loudspeakers}	H04R1/34	H04R1/34		2537
H04R1/347	12	{for obtaining a phase-shift between the front and back acoustic wave}	H04R1/34	H04R1/34		170
H04R1/36	11	by using a single aperture of dimensions not greater than the shortest operating wavelength	H04R1/36	H04R1/36		35
H04R1/38	11	in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone	H04R1/38	H04R1/38		598
H04R1/40	10	by combining a number of identical transducers {(specially adapted for hearing aids H04R25/405)}	H04R1/40	H04R1/40		528
H04R1/403	11	{loud-speakers}	H04R1/40	H04R1/40		2472
H04R1/406	11	{microphones}	H04R1/40	H04R1/40		3672
H04R1/42	8	Combinations of transducers with fluid-pressure or other non-electrical amplifying means	H04R1/42	H04R1/42		249
H04R1/44	8	Special adaptations for subaqueous use, e.g. for hydrophone	H04R1/44	H04R1/44		1083
H04R1/46	8	Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H04R1/14)	H04R1/46	H04R1/46		795
H04R3/00	7	Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)	H04R3/00	H04R3/00		12374
H04R3/002	8	{Damping circuit arrangements for transducers, e.g. motional feedback circuits}	H04R3/00	H04R3/00		1252
H04R3/005	8	{for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)}	H04R3/00	H04R3/00		6327
H04R3/007	8	{Protection circuits for transducers}	H04R3/00	H04R3/00		1239
H04R3/02	8	for preventing acoustic reaction {, i.e. acoustic oscillatory feedback (specially adapted for hearing aids H04R25/453)}	H04R3/02	H04R3/02		2008
H04R3/04	8	for correcting frequency response	H04R3/04	H04R3/04		4714
H04R3/06	9	of electrostatic transducers	H04R3/06	H04R3/06		240
H04R3/08	9	of electromagnetic transducers	H04R3/08	H04R3/08		305
H04R3/10	9	of variable resistance microphones	H04R3/10	H04R3/10		27
H04R3/12	8	for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)}	H04R3/12	H04R3/12		5007
H04R3/14	9	Cross-over networks	H04R3/14	H04R3/14		942
H04R5/00	7	Stereophonic arrangements (stereophonic pick-ups H04R9/16, H04R11/12, H04R17/08, H04R19/10)<br><br><u>NOTE</u><br><br>In this group, the expression "stereophonic arrangements" covers quadraphonic or similar arrangements.	H04R5/00	H04R5/00		376
H04R5/02	8	Spatial or constructional arrangements of loudspeakers	H04R5/02	H04R5/02		4604
H04R5/023	9	{in a chair, pillow}	H04R5/02	H04R5/02		854
H04R5/027	8	Spatial or constructional arrangements of microphones, e.g. in dummy heads	H04R5/027	H04R5/027		1283
H04R5/033	8	Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)}	H04R5/033	H04R5/033		3987
H04R5/0335	9	{Earpiece support, e.g. headbands or neckrests (for monophonic headphones H04R1/105)}	H04R5/033	H04R5/033		1969
H04R5/04	8	Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)}	H04R5/04	H04R5/04		4864
H04R7/00	7	Diaphragms for electromechanical transducers (in general F16J3/00); Cones (for musical instruments G10){(cones, diaphragms or the like, for emitting or receiving sound in general G10K13/00; Mounting thereof)}	H04R7/00	H04R7/00		703
H04R7/02	8	characterised by the construction	H04R7/02	H04R7/02		2034
H04R7/04	9	Plane diaphragms	H04R7/04	H04R7/04		2282
H04R7/045	10	{using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion}	H04R7/04	H04R7/04		1444
H04R7/06	10	comprising a plurality of sections or layers	H04R7/06	H04R7/06		848
H04R7/08	11	comprising superposed layers separated by air or other fluid	H04R7/08	H04R7/08		190
H04R7/10	11	comprising superposed layers in contact	H04R7/10	H04R7/10		954
H04R7/12	9	Non-planar diaphragms or cones	H04R7/12	H04R7/12		1551
H04R7/122	10	{comprising a plurality of sections or layers}	H04R7/12	H04R7/12		514
H04R7/125	11	{comprising a plurality of superposed layers in contact}	H04R7/12	H04R7/12		453
H04R7/127	10	{dome-shaped}	H04R7/12	H04R7/12		768
H04R7/14	10	corrugated, pleated or ribbed	H04R7/14	H04R7/14		591
H04R7/16	8	Mounting or tensioning of diaphragms or cones	H04R7/16	H04R7/16		1251
H04R7/18	9	at the periphery	H04R7/18	H04R7/18		1465
H04R7/20	10	Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands	H04R7/20	H04R7/20		1338
H04R7/22	10	Clamping rim of diaphragm or cone against seating	H04R7/22	H04R7/22		280
H04R7/24	9	Tensioning by means acting directly on free portions of diaphragm or cone	H04R7/24	H04R7/24		177
H04R7/26	8	Damping by means acting directly on free portion of diaphragm or cone (air damping H04R1/28)	H04R7/26	H04R7/26		478
H04R9/00	7	Transducers of moving-coil, moving-strip, or moving-wire type	H04R9/00	H04R9/00		301
H04R9/02	8	Details	H04R9/02	H04R9/02		5929
H04R9/022	9	{Cooling arrangements}	H04R9/02	H04R9/02		770
H04R9/025	9	{Magnetic circuit}	H04R9/02	H04R9/02		5573
H04R9/027	10	{Air gaps using a magnetic fluid}	H04R9/02	H04R9/02		295
H04R9/04	9	Construction, mounting, or centering of coil	H04R9/04	H04R9/04		1639
H04R9/041	10	{Centering}	H04R9/04	H04R9/04		363
H04R9/042	11	{by pressurised air}	H04R9/04	H04R9/04		42
H04R9/043	11	{Inner suspension or damper, e.g. spider (outer suspension or surround H04R7/16)}	H04R9/04	H04R9/04		905
H04R9/045	10	{Mounting (H04R9/043 takes precedence)}	H04R9/04	H04R9/04		1576
H04R9/046	10	{Construction}	H04R9/04	H04R9/04		1307
H04R9/047	11	{in which the windings of the moving coil lay in the same plane}	H04R9/04	H04R9/04		606
H04R9/048	12	{of the ribbon type}	H04R9/04	H04R9/04		151
H04R9/06	8	Loudspeakers	H04R9/06	H04R9/06		10042
H04R9/063	9	{using a plurality of acoustic drivers (H04R1/24 and H04R1/403 take precedence)}	H04R9/06	H04R9/06		970
H04R9/066	9	{using the principle of inertia}	H04R9/06	H04R9/06		456
H04R9/08	8	Microphones	H04R9/08	H04R9/08		586
H04R9/10	8	Telephone receivers	H04R9/10	H04R9/10		202
H04R9/12	8	Gramophone pick-ups using a stylus; Recorders using a stylus	H04R9/12	H04R9/12		187
H04R9/14	9	comprising two or more styli or transducers (H04R9/16 takes precedence)	H04R9/14	H04R9/14		1
H04R9/16	9	signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously	H04R9/16	H04R9/16		213
H04R9/18	8	Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency	H04R9/18	H04R9/18		60
H04R11/00	7	Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly coacting with electromagnet H04R13/00)	H04R11/00	H04R11/00		1240
H04R11/02	8	Loudspeakers	H04R11/02	H04R11/02		930
H04R11/04	8	Microphones	H04R11/04	H04R11/04		168
H04R11/06	8	Telephone receivers	H04R11/06	H04R11/06		170
H04R11/08	8	Gramophone pick-ups using a stylus; Recorders using a stylus	H04R11/08	H04R11/08		651
H04R11/10	9	comprising two or more styli or transducers (H04R11/12 takes precedence)	H04R11/10	H04R11/10		28
H04R11/12	9	signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously	H04R11/12	H04R11/12		224
H04R11/14	8	Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency	H04R11/14	H04R11/14		30
H04R13/00	7	Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet	H04R13/00	H04R13/00		341
H04R13/02	8	Telephone receivers	H04R13/02	H04R13/02		377
H04R15/00	7	Magnetostrictive transducers (magnetostrictive elements in general H10N30/00)	H04R15/00	H04R15/00		299
H04R15/02	8	Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency	H04R15/02	H04R15/02		28
H04R17/00	7	Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00})	H04R17/00	H04R17/00		4456
H04R17/005	8	{using a piezoelectric polymer}	H04R17/00	H04R17/00		810
H04R17/02	8	Microphones	H04R17/02	H04R17/02		983
H04R17/025	9	{using a piezoelectric polymer}	H04R17/02	H04R17/02		158
H04R17/04	8	Gramophone pick-ups using a stylus; Recorders using a stylus	H04R17/04	H04R17/04		225
H04R17/06	9	comprising two or more styli or transducers (H04R17/08 takes precedence)	H04R17/06	H04R17/06		119
H04R17/08	9	signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously	H04R17/08	H04R17/08		478
H04R17/10	8	Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency	H04R17/10	H04R17/10		431
H04R19/00	7	Electrostatic transducers	H04R19/00	H04R19/00		696
H04R19/005	8	{using semiconductor materials}	H04R19/00	H04R19/00		2631
H04R19/01	8	characterised by the use of electrets	H04R19/01	H04R19/01		267
H04R19/013	9	{for loudspeakers}	H04R19/01	H04R19/01		134
H04R19/016	9	{for microphones}	H04R19/01	H04R19/01		793
H04R19/02	8	Loudspeakers (H04R19/01 takes precedence)	H04R19/02	H04R19/02		1028
H04R19/04	8	Microphones (H04R19/01 takes precedence)	H04R19/04	H04R19/04		4030
H04R19/06	8	Gramophone pick-ups using a stylus; Recorders using a stylus (H04R19/01 takes precedence)	H04R19/06	H04R19/06		72
H04R19/08	9	comprising two or more styli or transducers (H04R19/10 takes precedence)	H04R19/08	H04R19/08		6
H04R19/10	9	signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously	H04R19/10	H04R19/10		26
H04R21/00	7	Variable-resistance transducers (gaseous resistance transducers H04R23/00; magneto-resistive transducers H04R23/00)	H04R21/00	H04R21/00		92
H04R21/02	8	Microphones	H04R21/02	H04R21/02		161
H04R21/021	9	{with granular resistance material}	H04R21/02	H04R21/02		913
H04R21/023	9	{with more than one granular chamber}	H04R21/02	H04R21/02		93
H04R21/025	9	{disposition of the granular chamber in microphones}	H04R21/02	H04R21/02		2
H04R21/026	9	{in which the sound is perpendicular to the current crossing the transducer material}	H04R21/02	H04R21/02		54
H04R21/028	9	{with a fluid as resistance material}	H04R21/02	H04R21/02		31
H04R21/04	8	Gramophone pick-ups using a stylus; Recorders using a stylus	H04R21/04	H04R21/04		110
H04R23/00	7	Transducers other than those covered by groups H04R9/00&#160;-&#160;H04R21/00{(diaphragms for transducers of the distributed-mode type H04R7/045)}	H04R23/00	H04R23/00		657
H04R23/002	8	{using electrothermic-effect transducer}	H04R23/00	H04R23/00		230
H04R23/004	8	{using ionised gas}	H04R23/00	H04R23/00		169
H04R23/006	8	{using solid state devices (solid state devices per seH10)}	H04R23/00	H04R23/00		268
H04R23/008	8	{using optical signals for detecting or generating sound}	H04R23/00	H04R23/00		600
H04R23/02	8	Transducers using more than one principle simultaneously	H04R23/02	H04R23/02		275
H04R25/00	7	Electric hearing aids<br><br><u>NOTE</u><br><br>Classification should be directed to groups H04R25/02, H04R25/04 or H04R25/50 and its subgroups, if and only if the technical subject in consideration cannot be classified elsewhere under the main group H04R25/00.	H04R25/00	H04R25/00		1768
H04R25/02	8	adapted to be supported entirely by ear	H04R25/02	H04R25/02		340
H04R25/04	8	comprising pocket amplifiers	H04R25/04	H04R25/04		233
H04R25/30	8	{Monitoring or testing of hearing aids, e.g. functioning, settings, battery power}	H04R25/00	H04R25/30		849
H04R25/305	9	{Self-monitoring or self-testing}	H04R25/00	H04R25/30		601
H04R25/35	8	{using translation techniques}	H04R25/00	H04R25/35		73
H04R25/353	9	{Frequency, e.g. frequency shift or compression}	H04R25/00	H04R25/35		378
H04R25/356	9	{Amplitude, e.g. amplitude shift or compression}	H04R25/00	H04R25/35		520
H04R25/40	8	{Arrangements for obtaining a desired directivity characteristic}	H04R25/00	H04R25/40		196
H04R25/402	9	{using contructional means}	H04R25/00	H04R25/40		188
H04R25/405	9	{by combining a plurality of transducers}	H04R25/00	H04R25/40		567
H04R25/407	9	{Circuits for combining signals of a plurality of transducers}	H04R25/00	H04R25/40		1077
H04R25/43	8	{Electronic input selection or mixing based on input signal analysis, e.g. mixing or selection between microphone and telecoil or between microphones with different directivity characteristics (H04R25/407 takes precedence)}	H04R25/00	H04R25/43		602
H04R25/45	8	{Prevention of acoustic reaction, i.e. acoustic oscillatory feedback}	H04R25/00	H04R25/45		109
H04R25/453	9	{electronically}	H04R25/00	H04R25/45		730
H04R25/456	9	{mechanically}	H04R25/00	H04R25/45		425
H04R25/48	8	{using constructional means for obtaining a desired frequency response (H04R25/652 takes precedence)}	H04R25/00	H04R25/48		380
H04R25/50	8	{Customised settings for obtaining desired overall acoustical characteristics}	H04R25/00	H04R25/50		840
H04R25/502	9	{using analog signal processing}	H04R25/00	H04R25/50		456
H04R25/505	9	{using digital signal processing}	H04R25/00	H04R25/50		1974
H04R25/507	10	{implemented by neural network or fuzzy logic}	H04R25/00	H04R25/50		320
H04R25/55	8	{using an external connection, either wireless or wired}	H04R25/00	H04R25/55		417
H04R25/552	9	{Binaural}	H04R25/00	H04R25/55		1097
H04R25/554	9	{using a wireless connection, e.g. between microphone and amplifier or using Tcoils}	H04R25/00	H04R25/55		2661
H04R25/556	9	{External connectors, e.g. plugs or modules (H04R25/607 takes precedence)}	H04R25/00	H04R25/55		406
H04R25/558	9	{Remote control, e.g. of amplification, frequency}	H04R25/00	H04R25/55		1084
H04R25/60	8	{Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles (ear wax retarders, e.g. mounting thereof H04R25/654)}	H04R25/00	H04R25/60		791
H04R25/602	9	{of batteries}	H04R25/00	H04R25/60		837
H04R25/603	9	{of mechanical or electronic switches or control elements}	H04R25/00	H04R25/60		929
H04R25/604	9	{of acoustic or vibrational transducers}	H04R25/00	H04R25/60		1040
H04R25/606	10	{acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window}	H04R25/00	H04R25/60		1550
H04R25/607	9	{of earhooks}	H04R25/00	H04R25/60		511
H04R25/609	9	{of circuitry (of electronic switches or control elements H04R25/603)}	H04R25/00	H04R25/60		715
H04R25/65	8	{Housing parts, e.g. shells, tips or moulds, or their manufacture}<br><br><u>NOTE</u><br><br>Housing parts for mechanical mounting or interconnection of hearing aid parts covered by H04R25/60 are to be classified in H04R25/60. 	H04R25/00	H04R25/65		1232
H04R25/652	9	{Ear tips; Ear moulds (hybrid ear moulds or post-processing thereof for their customisation H04R25/659)}	H04R25/00	H04R25/65		1291
H04R25/654	10	{Ear wax retarders}	H04R25/00	H04R25/65		404
H04R25/656	10	{Non-customized, universal ear tips, i.e. ear tips which are not specifically adapted to the size or shape of the ear or ear canal}	H04R25/00	H04R25/65		626
H04R25/658	9	{Manufacture of housing parts}	H04R25/00	H04R25/65		985
H04R25/659	10	{Post-processing of hybrid ear moulds for customisation, e.g. in-situ curing}	H04R25/00	H04R25/65		88
H04R25/70	8	{Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting}	H04R25/00	H04R25/70		1984
H04R25/75	8	{Electric tinnitus maskers providing an auditory perception}	H04R25/00	H04R25/75		374
H04R27/00	7	Public address systems (circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; {monitoring or testing arrangements for public address systems H04R29/007}; amplifiers H03F)	H04R27/00	H04R27/00		3408
H04R27/02	8	Amplifying systems for the deaf	H04R27/02	H04R27/02		149
H04R27/04	8	Electric megaphones	H04R27/04	H04R27/04		312
H04R29/00	7	Monitoring arrangements; Testing arrangements {(for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308)}	H04R29/00	H04R29/00		2391
H04R29/001	8	{for loudspeakers (H04R29/007 takes precedence)}	H04R29/00	H04R29/00		3431
H04R29/002	9	{Loudspeaker arrays}	H04R29/00	H04R29/00		426
H04R29/003	9	{of the moving-coil type}	H04R29/00	H04R29/00		274
H04R29/004	8	{for microphones (H04R29/007 takes precedence)}	H04R29/00	H04R29/00		1282
H04R29/005	9	{Microphone arrays}	H04R29/00	H04R29/00		538
H04R29/006	10	{Microphone matching}	H04R29/00	H04R29/00		199
H04R29/007	8	{for public address systems (public address systems per seH04R27/00)}	H04R29/00	H04R29/00		502
H04R29/008	8	{Visual indication of individual signal levels (visual indication of stereophonic sound image H04S7/40)}	H04R29/00	H04R29/00		625
H04R31/00	7	Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor {(manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182)}	H04R31/00	H04R31/00		3558
H04R31/003	8	{for diaphragms or their outer suspension}	H04R31/00	H04R31/00		2297
H04R31/006	8	{Interconnection of transducer parts (of diaphragm and outer suspension by moulding H04R31/003)}	H04R31/00	H04R31/00		1890
H04R2201/00	7	Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups	CPCONLY	H04R2201/00		14
H04R2201/003	8	Mems transducers or their use	CPCONLY	H04R2201/003		3121
H04R2201/02	8	Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups	CPCONLY	H04R2201/02		956
H04R2201/021	9	Transducers or their casings adapted for mounting in or to a wall or ceiling	CPCONLY	H04R2201/021		994
H04R2201/023	9	Transducers incorporated in garment, rucksacks or the like	CPCONLY	H04R2201/023		764
H04R2201/025	9	Transducer mountings or cabinet supports enabling variable orientation of transducer of cabinet	CPCONLY	H04R2201/025		949
H04R2201/028	9	Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure (H04R2499/10 takes precedence; Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer H04R2205/026)	CPCONLY	H04R2201/028		704
H04R2201/029	9	Manufacturing aspects of enclosures transducers	CPCONLY	H04R2201/029		601
H04R2201/10	8	Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups	CPCONLY	H04R2201/10		3233
H04R2201/103	9	Combination of monophonic or stereophonic headphones with audio players, e.g. integrated in the headphone	CPCONLY	H04R2201/103		262
H04R2201/105	9	Manufacture of mono- or stereophonic headphone components	CPCONLY	H04R2201/105		1258
H04R2201/107	9	Monophonic and stereophonic headphones with microphone for two-way hands free communication	CPCONLY	H04R2201/107		1963
H04R2201/109	9	Arrangements to adapt hands free headphones for use on both ears	CPCONLY	H04R2201/109		278
H04R2201/34	8	Directing or guiding sound by means of a phase plug	CPCONLY	H04R2201/34		256
H04R2201/40	8	Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups	CPCONLY	H04R2201/40		220
H04R2201/401	9	2D or 3D arrays of transducers	CPCONLY	H04R2201/401		1383
H04R2201/403	9	Linear arrays of transducers	CPCONLY	H04R2201/403		687
H04R2201/405	9	Non-uniform arrays of transducers or a plurality of uniform arrays with different transducer spacing	CPCONLY	H04R2201/405		303
H04R2203/00	7	Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups	CPCONLY	H04R2203/00		135
H04R2203/12	8	Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays	CPCONLY	H04R2203/12		494
H04R2205/00	7	Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups	CPCONLY	H04R2205/00		24
H04R2205/021	8	Aspects relating to docking-station type assemblies to obtain an acoustical effect, e.g. the type of connection to external loudspeakers or housings, frequency improvement	CPCONLY	H04R2205/021		379
H04R2205/022	8	Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure	CPCONLY	H04R2205/022		545
H04R2205/024	8	Positioning of loudspeaker enclosures for spatial sound reproduction	CPCONLY	H04R2205/024		523
H04R2205/026	8	Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer	CPCONLY	H04R2205/026		157
H04R2205/041	8	Adaptation of stereophonic signal reproduction for the hearing impaired	CPCONLY	H04R2205/041		242
H04R2207/00	7	Details 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	CPCONLY	H04R2207/00		52
H04R2207/021	8	Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges	CPCONLY	H04R2207/021		293
H04R2209/00	7	Details 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	CPCONLY	H04R2209/00		94
H04R2209/021	8	Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer	CPCONLY	H04R2209/021		57
H04R2209/022	8	Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils	CPCONLY	H04R2209/022		518
H04R2209/024	8	Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers	CPCONLY	H04R2209/024		518
H04R2209/026	8	Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice (H04R2400/03 takes precedence)	CPCONLY	H04R2209/026		133
H04R2209/027	8	Electrical or mechanical reduction of yoke vibration	CPCONLY	H04R2209/027		173
H04R2209/041	8	Voice coil arrangements comprising more than one voice coil unit on the same bobbin	CPCONLY	H04R2209/041		261
H04R2209/043	8	Short circuited voice coils driven by induction	CPCONLY	H04R2209/043		30
H04R2217/00	7	Details of magnetostrictive, piezoelectric, or electrostrictive transducers covered by H04R15/00 or H04R17/00 but not provided for in any of their subgroups	CPCONLY	H04R2217/00		43
H04R2217/01	8	Non-planar magnetostrictive, piezoelectric or electrostrictive benders	CPCONLY	H04R2217/01		87
H04R2217/03	8	Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves	CPCONLY	H04R2217/03		518
H04R2225/00	7	Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups	CPCONLY	H04R2225/00		54
H04R2225/021	8	Behind the ear [BTE] hearing aids	CPCONLY	H04R2225/021		458
H04R2225/0213	9	Constructional details of earhooks, e.g. shape, material	CPCONLY	H04R2225/0213		436
H04R2225/0216	9	BTE hearing aids having a receiver in the ear mould	CPCONLY	H04R2225/0216		350
H04R2225/023	8	Completely in the canal [CIC] hearing aids	CPCONLY	H04R2225/023		425
H04R2225/025	8	In the ear hearing aids [ITE] hearing aids	CPCONLY	H04R2225/025		837
H04R2225/31	8	Aspects of the use of accumulators in hearing aids, e.g. rechargeable batteries or fuel cells	CPCONLY	H04R2225/31		631
H04R2225/33	8	Aspects relating to adaptation of the battery voltage, e.g. its regulation, increase or decrease	CPCONLY	H04R2225/33		197
H04R2225/39	8	Aspects relating to automatic logging of sound environment parameters and the performance of the hearing aid during use, e.g. histogram logging, or of user selected programs or settings in the hearing aid, e.g. usage logging	CPCONLY	H04R2225/39		335
H04R2225/41	8	Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest	CPCONLY	H04R2225/41		1065
H04R2225/43	8	Signal processing in hearing aids to enhance the speech intelligibility	CPCONLY	H04R2225/43		1713
H04R2225/49	8	Reducing the effects of electromagnetic noise on the functioning of hearing aids, by, e.g. shielding, signal processing adaptation, selective (de)activation of electronic parts in hearing aid	CPCONLY	H04R2225/49		328
H04R2225/51	8	Aspects of antennas or their circuitry in or for hearing aids	CPCONLY	H04R2225/51		608
H04R2225/53	8	Hearing aid for unilateral hearing impairment using Contralateral Routing Of Signals [CROS]	CPCONLY	H04R2225/53		45
H04R2225/55	8	Communication between hearing aids and external devices via a network for data exchange	CPCONLY	H04R2225/55		1034
H04R2225/57	8	Aspects of electrical interconnection between hearing aid parts	CPCONLY	H04R2225/57		342
H04R2225/59	8	Arrangements for selective connection between one or more amplifiers and one or more receivers within one hearing aid	CPCONLY	H04R2225/59		47
H04R2225/61	8	Aspects relating to mechanical or electronic switches or control elements, e.g. functioning	CPCONLY	H04R2225/61		1033
H04R2225/67	8	Implantable hearing aids or parts thereof not covered by H04R25/606	CPCONLY	H04R2225/67		727
H04R2225/77	8	Design aspects, e.g. CAD, of hearing aid tips, moulds or housings	CPCONLY	H04R2225/77		319
H04R2225/81	8	Aspects of electrical fitting of hearing aids related to problems arising from the emotional state of a hearing aid user, e.g. nervousness or unwillingness during fitting	CPCONLY	H04R2225/81		49
H04R2225/83	8	Aspects of electrical fitting of hearing aids related to problems arising from growth of the hearing aid user, e.g. children	CPCONLY	H04R2225/83		26
H04R2227/00	7	Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups	CPCONLY	H04R2227/00		36
H04R2227/001	8	Adaptation of signal processing in PA systems in dependence of presence of noise	CPCONLY	H04R2227/001		167
H04R2227/003	8	Digital PA systems using, e.g. LAN or internet	CPCONLY	H04R2227/003		832
H04R2227/005	8	Audio distribution systems for home, i.e. multi-room use	CPCONLY	H04R2227/005		713
H04R2227/007	8	Electronic adaptation of audio signals to reverberation of the listening space for PA	CPCONLY	H04R2227/007		146
H04R2227/009	8	Signal processing in [PA] systems to enhance the speech intelligibility	CPCONLY	H04R2227/009		172
H04R2231/00	7	Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups	CPCONLY	H04R2231/00		189
H04R2231/001	8	Moulding aspects of diaphragm or surround	CPCONLY	H04R2231/001		741
H04R2231/003	8	Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms	CPCONLY	H04R2231/003		654
H04R2307/00	7	Details 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	CPCONLY	H04R2307/00		80
H04R2307/021	8	Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen	CPCONLY	H04R2307/021		276
H04R2307/023	8	Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials	CPCONLY	H04R2307/023		402
H04R2307/025	8	Diaphragms comprising polymeric materials	CPCONLY	H04R2307/025		807
H04R2307/027	8	Diaphragms comprising metallic materials	CPCONLY	H04R2307/027		396
H04R2307/029	8	Diaphragms comprising fibres	CPCONLY	H04R2307/029		453
H04R2307/201	8	Damping aspects of the outer suspension of loudspeaker diaphragms by addition of additional damping means	CPCONLY	H04R2307/201		119
H04R2307/204	8	Material aspects of the outer suspension of loudspeaker diaphragms	CPCONLY	H04R2307/204		196
H04R2307/207	8	Shape aspects of the outer suspension of loudspeaker diaphragms	CPCONLY	H04R2307/207		365
H04R2400/00	7	Loudspeakers<br><br><u>NOTE</u><br><br>H04R2400/00 itself is only to be used for those cases where the classification does not allow specification the type of transducer and the type is important, e.g. frequency control circuit ( H04R3/04 and subgroups) may require different circuits for microphones or for loudspeakers 	CPCONLY	H04R2400/00		185
H04R2400/01	8	Transducers used as a loudspeaker to generate sound aswell as a microphone to detect sound	CPCONLY	H04R2400/01		256
H04R2400/03	8	Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones	CPCONLY	H04R2400/03		698
H04R2400/07	8	Suspension between moving magnetic core and housing	CPCONLY	H04R2400/07		210
H04R2400/11	8	Aspects regarding the frame of loudspeaker transducers	CPCONLY	H04R2400/11		4380
H04R2400/13	8	Use or details of compression drivers	CPCONLY	H04R2400/13		138
H04R2410/00	7	Microphones<br><br><u>NOTE</u><br><br>H04R2410/00 itself is only to be used for those cases where the classification does not allow specification the type of transducer and the type is important, e.g. frequency control circuit ( H04R3/04 and subgroups) may require different circuits for microphones or for loudspeakers 	CPCONLY	H04R2410/00		462
H04R2410/01	8	Noise reduction using microphones having different directional characteristics	CPCONLY	H04R2410/01		609
H04R2410/03	8	Reduction of intrinsic noise in microphones	CPCONLY	H04R2410/03		409
H04R2410/05	8	Noise reduction with a separate noise microphone	CPCONLY	H04R2410/05		905
H04R2410/07	8	Mechanical or electrical reduction of wind noise generated by wind passing a microphone	CPCONLY	H04R2410/07		627
H04R2420/00	7	Details of connection covered by H04R, not provided for in its groups	CPCONLY	H04R2420/00		93
H04R2420/01	8	Input selection or mixing for amplifiers or loudspeakers	CPCONLY	H04R2420/01		976
H04R2420/03	8	Connection circuits to selectively connect loudspeakers or headphones to amplifiers	CPCONLY	H04R2420/03		1071
H04R2420/05	8	Detection of connection of loudspeakers or headphones to amplifiers	CPCONLY	H04R2420/05		985
H04R2420/07	8	Applications of wireless loudspeakers or wireless microphones	CPCONLY	H04R2420/07		7788
H04R2420/09	8	Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones	CPCONLY	H04R2420/09		1093
H04R2430/00	7	Signal processing covered by H04R, not provided for in its groups	CPCONLY	H04R2430/00		2342
H04R2430/01	8	Aspects of volume control, not necessarily automatic, in sound systems	CPCONLY	H04R2430/01		3541
H04R2430/03	8	Synergistic effects of band splitting and sub-band processing	CPCONLY	H04R2430/03		1399
H04R2430/20	8	Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic (H04R2203/12 takes precedence)	CPCONLY	H04R2430/20		1281
H04R2430/21	9	Direction finding using differential microphone array [DMA]	CPCONLY	H04R2430/21		257
H04R2430/23	9	Direction finding using a sum-delay beam-former	CPCONLY	H04R2430/23		507
H04R2430/25	9	Array processing for suppression of unwanted side-lobes in directivity characteristics, e.g. a blocking matrix	CPCONLY	H04R2430/25		222
H04R2440/00	7	Bending wave transducers covered by H04R, not provided for in its groups	CPCONLY	H04R2440/00		15
H04R2440/01	8	Acoustic transducers using travelling bending waves to generate or detect sound	CPCONLY	H04R2440/01		120
H04R2440/03	8	Resonant bending wave transducer used as a microphone	CPCONLY	H04R2440/03		13
H04R2440/05	8	Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels	CPCONLY	H04R2440/05		373
H04R2440/07	8	Loudspeakers using bending wave resonance and pistonic motion to generate sound	CPCONLY	H04R2440/07		114
H04R2460/00	7	Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups	CPCONLY	H04R2460/00		57
H04R2460/01	8	Hearing devices using active noise cancellation	CPCONLY	H04R2460/01		1789
H04R2460/03	8	Aspects of the reduction of energy consumption in hearing devices	CPCONLY	H04R2460/03		821
H04R2460/05	8	Electronic compensation of the occlusion effect	CPCONLY	H04R2460/05		173
H04R2460/07	8	Use of position data from wide-area or local-area positioning systems in hearing devices, e.g. program or information selection	CPCONLY	H04R2460/07		565
H04R2460/09	8	Non-occlusive ear tips, i.e. leaving the ear canal open, for both custom and non-custom tips (H04R2460/11 takes precedence)	CPCONLY	H04R2460/09		306
H04R2460/11	8	Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion	CPCONLY	H04R2460/11		839
H04R2460/13	8	Hearing devices using bone conduction transducers	CPCONLY	H04R2460/13		2549
H04R2460/15	8	Determination of the acoustic seal of ear moulds or ear tips of hearing devices	CPCONLY	H04R2460/15		378
H04R2460/17	8	Hearing device specific tools used for storing or handling hearing devices or parts thereof, e.g. placement in the ear, replacement of cerumen barriers, repair, cleaning hearing devices	CPCONLY	H04R2460/17		658
H04R2499/00	7	Aspects covered by H04R or H04S not otherwise provided for in their subgroups	CPCONLY	H04R2499/00		7
H04R2499/01	8	General technical reviews, overviews, tutorials	CPCONLY	H04R2499/01		9
H04R2499/10	8	General applications	CPCONLY	H04R2499/10		110
H04R2499/11	9	Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA&apos;s, camera&apos;s	CPCONLY	H04R2499/11		7234
H04R2499/13	9	Acoustic transducers and sound field adaptation in vehicles	CPCONLY	H04R2499/13		5250
H04R2499/15	9	Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops	CPCONLY	H04R2499/15		3616
