H04R

LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS

DEAF-AID SETS

PUBLIC ADDRESS SYSTEMS generating mechanical vibrations in general B06B; transducers for measuring particular variables G01; transducers in clocks G04; producing sounds with frequency not determined by supply frequency G10K; transducers in recording or reproducing heads G11B; transducers in motors H02

This subclass covers :

loudspeakers, microphones, acoustic transducers therefor producing acoustic waves or variations of electric current or voltage, or gramophone pick-ups;

arrangements actuated by variations of electric current or voltage for cutting grooves in records;

circuits for the above-mentioned loudspeakers, microphones, acoustic transducers, gramophone pick-ups or arrangements;

monitoring or testing of the above-mentioned loudspeakers, microphones, acoustic transducers, gramophone pick-ups or arrangements

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

H04R1/00

Details of transducers,

loudspeakers or microphones

H04R1/005

using digitally weighted transducing elements

H04R1/02

Casings

Cabinets

; Supports therefor;

Mountings therein H04R1/28 takes precedence

; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075

H04R1/021

incorporating only one transducer

H04R1/023

Screens for loudspeakers

H04R1/025

Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture

H04R1/026

Supports for loudspeaker casings

H04R1/028

associated with devices performing functions other than acoustics, e.g. electric candles

H04R1/04

Structural association of microphone with electric circuitry therefor in deaf-aid sets H04R25/00

H04R1/06

Arranging circuit leads

Relieving strain on circuit leads

H04R1/08

Mouthpieces

Microphones;

Attachments therefor

H04R1/083

Special constructions of mouthpieces

H04R1/086

Protective screens, e.g. all weather or wind screens

H04R1/10

Earpieces

Attachments therefor

; Earphones; Monophonic headphones H04R1/28 takes precedence; stereophonic headphones H04R5/033

This group covers details of headphones, both of monophonic and stereophonic type.

When classifying in this group or in its subgroups, aspects relating to stereophonic headphones are to be classified in H04R5/033 as well

H04R1/1008

Earpieces of the supra-aural or circum-aural type

H04R1/1016

Earpieces of the intra-aural type

H04R1/1025

Accumulators or arrangements for charging secondary cells per se H01M10/00; charging in general H02J7/00

H04R1/1033

Cables or cables storage, e.g. cable reels cord reels per se H02G11/02; 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

H04R1/1041

Mechanical or electronic switches, or control elements switches in general H01H

H04R1/105

Earpiece supports, e.g. ear hooks for stereophonic headphones H04R5/0335

H04R1/1058

Manufacture or assembly

H04R1/1066

Constructional aspects of the interconnection between earpiece and earpiece support earpiece support for monophonic headphones H04R1/105; earpiece support for stereophonic headphones H04R5/0335

H04R1/1075

Mountings of transducers in earphones or headphones

H04R1/1083

Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06

H04R1/1091

Details not provided for in groups H04R1/1008 - H04R1/1083

H04R1/12

Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection

H04R1/14

Throat mountings for microphones

H04R1/16

Mounting or connecting stylus to transducer with or without damping means

H04R1/18

Holders for styli

Mounting holders on transducers

H04R1/20

Arrangements for obtaining desired frequency or directional characteristics for stereophonic purpose H04R5/00

H04R1/22

for obtaining desired frequency characteristic only circuit for combining transducers having different responses H04R3/00

for hearing aids H04R25/407

H04R1/222

for microphones H04R1/24, H04R1/26 take precedence

H04R1/225

for telephonic receivers

H04R1/227

using transducers reproducing the same frequency band

H04R1/24

Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges

H04R1/245

of microphones

H04R1/26

Spatial arrangements of separate transducers responsive to two or more frequency ranges

H04R1/265

of microphones

H04R1/28

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

H04R1/2803

for loudspeaker transducers

H04R1/2807

Enclosures comprising vibrating or resonating arrangements for the reduction of undesired resonances or vibrations H04R1/2869

H04R1/2811

for loudspeaker transducers

H04R1/2815

of the bass reflex type

H04R1/2819

for loudspeaker transducers

H04R1/2823

Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material number or position of ports H04R1/2815; vents in bandpass type enclosures H04R1/2846

H04R1/2826

for loudspeaker transducers

H04R1/283

using a passive diaphragm

H04R1/2834

for loudspeaker transducers

H04R1/2838

of the bandpass type

H04R1/2842

for loudspeaker transducers

H04R1/2846

Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material number or position of ports H04R1/2838; vents in bass reflex type enclosures H04R1/2823

H04R1/2849

for loudspeaker transducers

H04R1/2853

using an acoustic labyrinth or a transmission line

H04R1/2857

for loudspeaker transducers

H04R1/2861

using a back-loaded horn

H04R1/2865

for loudspeaker transducers

H04R1/2869

Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself

H04R1/2873

for loudspeaker transducers

H04R1/2876

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

H04R1/288

for loudspeaker transducers

H04R1/2884

by means of the enclosure structure, i.e. strengthening or shape of the enclosure by means of Helmholtz resonators H04R1/2869

H04R1/2888

for loudspeaker transducers

H04R1/2892

Mountings or supports for transducers

H04R1/2896

for loudspeaker transducers

H04R1/30

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

H04R1/32

for obtaining desired directional characteristic only

specially adapted for hearing aids H04R25/40

H04R1/323

for loudspeakers H04R1/34 and H04R1/40 take precedence

H04R1/326

for microphones H04R1/34 and H04R1/40 take precedence

H04R1/34

by using a single transducer with sound reflecting, diffracting, directing or guiding means

specially adapted for hearing aids H04R25/402

H04R1/342

for microphones

H04R1/345

for loudspeakers

H04R1/347

for obtaining a phase-shift between the front and back acoustic wave

H04R1/36

by using a single aperture of dimensions not greater than the shortest operating wavelength

H04R1/38

in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone

H04R1/40

by combining a number of identical transducers

specially adapted for hearing aids H04R25/405

H04R1/403

loud-speakers

H04R1/406

microphones

H04R1/42

Combinations of transducers with fluid-pressure or other non-electrical amplifying means

H04R1/44

Special adaptations for subaqueous use, e.g. for hydrophone

H04R1/46

Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope throat mountings H04R1/14

H04R3/00

Circuits for transducers

, loudspeakers or microphones

H04R3/002

Damping circuit arrangements for transducers, e.g. motional feedback circuits

H04R3/005

for combining the signals of two or more microphones specially adapted for hearing aids H04R25/407

H04R3/007

Protection circuits for transducers

H04R3/02

for preventing acoustic reaction

, i.e. acoustic oscillatory feedback specially adapted for hearing aids H04R25/453

H04R3/04

for correcting frequency response

H04R3/06

of electrostatic transducers

H04R3/08

of electromagnetic transducers

H04R3/10

of variable resistance microphones

H04R3/12

for distributing signals to two or more loudspeakers

specially adapted for hearing aids H04R25/407

H04R3/14

Cross-over networks

H04R5/00

Stereophonic arrangements stereophonic pick-ups H04R9/16, H04R11/12, H04R17/08, H04R19/10

In this group, the expression "stereophonic arrangements" covers quadraphonic or similar arrangements.

H04R5/02

Spatial or constructional arrangements of loudspeakers

H04R5/023

in a chair, pillow

H04R5/027

Spatial or constructional arrangements of microphones, e.g. in dummy heads

H04R5/033

Headphones for stereophonic communication

details thereof, e.g. relating to batteries, cables or control elements H04R1/10

H04R5/0335

Earpiece support, e.g. headbands or neckrests for monophonic headphones H04R1/105

H04R5/04

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

H04R7/00

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

H04R7/02

characterised by the construction

H04R7/04

Plane diaphragms

H04R7/045

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

H04R7/06

comprising a plurality of sections or layers

H04R7/08

comprising superposed layers separated by air or other fluid

H04R7/10

comprising superposed layers in contact

H04R7/12

Non-planar diaphragms or cones

H04R7/122

comprising a plurality of sections or layers

H04R7/125

comprising a plurality of superposed layers in contact

H04R7/127

dome-shaped

H04R7/14

corrugated, pleated or ribbed

H04R7/16

Mounting or tensioning of diaphragms or cones

H04R7/18

at the periphery

H04R7/20

Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

H04R7/22

Clamping rim of diaphragm or cone against seating

H04R7/24

Tensioning by means acting directly on free portions of diaphragm or cone

H04R7/26

Damping by means acting directly on free portion of diaphragm or cone air damping H04R1/28

H04R9/00

Transducers of moving-coil, moving-strip, or moving-wire type

H04R9/02

Details

H04R9/022

Cooling arrangements

H04R9/025

Magnetic circuit

H04R9/027

Air gaps using a magnetic fluid

H04R9/04

Construction, mounting, or centering of coil

H04R9/041

Centering

H04R9/042

by pressurised air

H04R9/043

Inner suspension or damper, e.g. spider outer suspension or surround H04R7/16

H04R9/045

Mounting H04R9/043 takes precedence

H04R9/046

Construction

H04R9/047

in which the windings of the moving coil lay in the same plane

H04R9/048

of the ribbon type

H04R9/06

Loudspeakers

H04R9/063

using a plurality of acoustic drivers H04R1/24 and H04R1/403 take precedence

H04R9/066

using the principle of inertia

H04R9/08

Microphones

H04R9/10

Telephone receivers

H04R9/12

Gramophone pick-ups using a stylus

Recorders using a stylus

H04R9/14

comprising two or more styli or transducers H04R9/16 takes precedence

H04R9/16

signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

H04R9/18

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

H04R11/00

Transducers of moving-armature or moving-core type acoustic diaphragm of magnetisable material directly coacting with electromagnet H04R13/00

H04R11/02

Loudspeakers

H04R11/04

Microphones

H04R11/06

Telephone receivers

H04R11/08

Gramophone pick-ups using a stylus

Recorders using a stylus

H04R11/10

comprising two or more styli or transducers H04R11/12 takes precedence

H04R11/12

signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

H04R11/14

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

H04R13/00

Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

H04R13/02

Telephone receivers

H04R15/00

Magnetostrictive transducers magnetostrictive elements in general H10N30/00

H04R15/02

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

H04R17/00

Piezo-electric transducers

Electrostrictive transducers piezo-electric or electrostrictive elements in general H10N30/00; details of piezo-electric or electrostrictive motors, generators or positioners

H10N30/00

H04R17/005

using a piezo-electric polymer

H04R17/02

Microphones

H04R17/025

using a piezo-electric polymer

H04R17/04

Gramophone pick-ups using a stylus

Recorders using a stylus

H04R17/06

comprising two or more styli or transducers H04R17/08 takes precedence

H04R17/08

signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

H04R17/10

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

H04R19/00

Electrostatic transducers

H04R19/005

using semiconductor materials

H04R19/01

characterised by the use of electrets

H04R19/013

for loudspeakers

H04R19/016

for microphones

H04R19/02

Loudspeakers H04R19/01 takes precedence

H04R19/04

Microphones H04R19/01 takes precedence

H04R19/06

Gramophone pick-ups using a stylus

Recorders using a stylus H04R19/01 takes precedence

H04R19/08

comprising two or more styli or transducers H04R19/10 takes precedence

H04R19/10

signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

H04R21/00

Variable-resistance transducers gaseous resistance transducers H04R23/00; magneto-resistive transducers H04R23/00

H04R21/02

Microphones

H04R21/021

with granular resistance material

H04R21/023

with more than one granular chamber

H04R21/025

disposition of the granular chamber in microphones

H04R21/026

in which the sound is perpendicular to the current crossing the transducer material

H04R21/028

with a fluid as resistance material

H04R21/04

Gramophone pick-ups using a stylus

Recorders using a stylus

H04R23/00

Transducers other than those covered by groups H04R9/00 - H04R21/00

diaphragms for transducers of the distributed-mode type H04R7/045

H04R23/002

using electrothermic-effect transducer

H04R23/004

using ionised gas

H04R23/006

using solid state devices solid state devices per se

H01L

H04R23/008

using optical signals for detecting or generating sound

H04R23/02

Transducers using more than one principle simultaneously

H04R25/00

Deaf-aid sets

, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception electrical stimulation of auditory nerves to promote the auditory function A61N1/36038; optical stimulation of auditory nerves to promote the auditory function A61N5/0622

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

H04R25/02

adapted to be supported entirely by ear

H04R25/04

comprising pocket amplifiers

H04R25/30

Monitoring or testing of hearing aids, e.g. functioning, settings, battery power

H04R25/305

Self-monitoring or self-testing

H04R25/35

using translation techniques

H04R25/353

Frequency, e.g. frequency shift or compression

H04R25/356

Amplitude, e.g. amplitude shift or compression

H04R25/40

Arrangements for obtaining a desired directivity characteristic

H04R25/402

using contructional means

H04R25/405

by combining a plurality of transducers

H04R25/407

Circuits for combining signals of a plurality of transducers

H04R25/43

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

H04R25/45

Prevention of acoustic reaction, i.e. acoustic oscillatory feedback

H04R25/453

electronically

H04R25/456

mechanically

H04R25/48

using constructional means for obtaining a desired frequency response H04R25/652 takes precedence

H04R25/50

Customised settings for obtaining desired overall acoustical characteristics

H04R25/502

using analog signal processing

H04R25/505

using digital signal processing

H04R25/507

implemented by neural network or fuzzy logic

H04R25/55

using an external connection, either wireless or wired

H04R25/552

Binaural

H04R25/554

using a wireless connection, e.g. between microphone and amplifier or using Tcoils

H04R25/556

External connectors, e.g. plugs or modules H04R25/607 takes precedence

H04R25/558

Remote control, e.g. of amplification, frequency

H04R25/60

Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles ear wax retarders, e.g. mounting thereof H04R25/654

H04R25/602

of batteries

H04R25/603

of mechanical or electronic switches or control elements

H04R25/604

of acoustic or vibrational transducers

H04R25/606

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

H04R25/607

of earhooks

H04R25/609

of circuitry of electronic switches or control elements H04R25/603

H04R25/65

Housing parts, e.g. shells, tips or moulds, or their manufacture

Housing parts for mechanical mounting or interconnection of hearing aid parts covered by H04R25/60 are to be classified in H04R25/60

H04R25/652

Ear tips; Ear moulds hybrid ear moulds or post-processing thereof for their customisation H04R25/659

H04R25/654

Ear wax retarders

H04R25/656

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

H04R25/658

Manufacture of housing parts

H04R25/659

Post-processing of hybrid ear moulds for customisation, e.g. in-situ curing

H04R25/70

Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting

H04R25/75

Electric tinnitus maskers providing an auditory perception

H04R27/00

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

H04R27/02

Amplifying systems for the deaf

H04R27/04

Electric megaphones

H04R29/00

Monitoring arrangements

Testing arrangements

for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308

H04R29/001

for loudspeakers H04R29/007 takes precedence

H04R29/002

Loudspeaker arrays

H04R29/003

of the moving-coil type

H04R29/004

for microphones H04R29/007 takes precedence

H04R29/005

Microphone arrays

H04R29/006

Microphone matching

H04R29/007

for public address systems public address systems per se

H04R27/00

H04R29/008

Visual indication of individual signal levels visual indication of stereophonic sound image H04S7/40

H04R31/00

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

H04R31/003

for diaphragms or their outer suspension

H04R31/006

Interconnection of transducer parts of diaphragm and outer suspension by moulding H04R31/003

H04R2201/00

Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups

H04R2201/003

Mems transducers or their use of the electrostatic type H04R19/005

H04R2201/02

Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups

H04R2201/021

Transducers or their casings adapted for mounting in or to a wall or ceiling

H04R2201/023

Transducers incorporated in garment, rucksacks or the like

H04R2201/025

Transducer mountings or cabinet supports enabling variable orientation of transducer of cabinet

H04R2201/028

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

H04R2201/029

Manufacturing aspects of enclosures transducers

H04R2201/10

Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

H04R2201/103

Combination of monophonic or stereophonic headphones with audio players, e.g. integrated in the headphone

H04R2201/105

Manufacture of mono- or stereophonic headphone components

H04R2201/107

Monophonic and stereophonic headphones with microphone for two-way hands free communication

H04R2201/109

Arrangements to adapt hands free headphones for use on both ears

H04R2201/34

Directing or guiding sound by means of a phase plug

H04R2201/40

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

H04R2201/401

2D or 3D arrays of transducers

H04R2201/403

Linear arrays of transducers

H04R2201/405

Non-uniform arrays of transducers or a plurality of uniform arrays with different transducer spacing

H04R2203/00

Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups

H04R2203/12

Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays

H04R2205/00

Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups

H04R2205/021

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

H04R2205/022

Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure

H04R2205/024

Positioning of loudspeaker enclosures for spatial sound reproduction

H04R2205/026

Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer

H04R2205/041

Adaptation of stereophonic signal reproduction for the hearing impaired

H04R2207/00

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

H04R2207/021

Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges

H04R2209/00

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

H04R2209/021

Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer

H04R2209/022

Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils

H04R2209/024

Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers

H04R2209/026

Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice H04R2400/03 takes precedence

H04R2209/027

Electrical or mechanical reduction of yoke vibration

H04R2209/041

Voice coil arrangements comprising more than one voice coil unit on the same bobbin

H04R2209/043

Short circuited voice coils driven by induction

H04R2217/00

Details of magnetostrictive, piezo-electric, or electrostrictive transducers covered by H04R15/00 or H04R17/00 but not provided for in any of their subgroups

H04R2217/01

Non-planar magnetostrictive, piezo-electric or electrostrictive benders

H04R2217/03

Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves

H04R2225/00

Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups

H04R2225/021

Behind the ear [BTE] hearing aids

H04R2225/0213

Constructional details of earhooks, e.g. shape, material

H04R2225/0216

BTE hearing aids having a receiver in the ear mould

H04R2225/023

Completely in the canal [CIC] hearing aids

H04R2225/025

In the ear hearing aids [ITE] hearing aids

H04R2225/31

Aspects of the use of accumulators in hearing aids, e.g. rechargeable batteries or fuel cells

H04R2225/33

Aspects relating to adaptation of the battery voltage, e.g. its regulation, increase or decrease

H04R2225/39

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

H04R2225/41

Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest

H04R2225/43

Signal processing in hearing aids to enhance the speech intelligibility

H04R2225/49

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

H04R2225/51

Aspects of antennas or their circuitry in or for hearing aids

H04R2225/53

Hearing aid for unilateral hearing impairment using Contralateral Routing Of Signals [CROS]

H04R2225/55

Communication between hearing aids and external devices via a network for data exchange

H04R2225/57

Aspects of electrical interconnection between hearing aid parts

H04R2225/59

Arrangements for selective connection between one or more amplifiers and one or more receivers within one hearing aid

H04R2225/61

Aspects relating to mechanical or electronic switches or control elements, e.g. functioning

H04R2225/67

Implantable hearing aids or parts thereof not covered by H04R25/606

H04R2225/77

Design aspects, e.g. CAD, of hearing aid tips, moulds or housings

H04R2225/81

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

H04R2225/83

Aspects of electrical fitting of hearing aids related to problems arising from growth of the hearing aid user, e.g. children

H04R2227/00

Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups

H04R2227/001

Adaptation of signal processing in PA systems in dependence of presence of noise

H04R2227/003

Digital PA systems using, e.g. LAN or internet

H04R2227/005

Audio distribution systems for home, i.e. multi-room use

H04R2227/007

Electronic adaptation of audio signals to reverberation of the listening space for PA

H04R2227/009

Signal processing in [PA] systems to enhance the speech intelligibility

H04R2231/00

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

H04R2231/001

Moulding aspects of diaphragm or surround

H04R2231/003

Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms

H04R2307/00

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

H04R2307/021

Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen

H04R2307/023

Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials

H04R2307/025

Diaphragms comprising polymeric materials

H04R2307/027

Diaphragms comprising metallic materials

H04R2307/029

Diaphragms comprising fibres

H04R2307/201

Damping aspects of the outer suspension of loudspeaker diaphragms by addition of additional damping means

H04R2307/204

Material aspects of the outer suspension of loudspeaker diaphragms

H04R2307/207

Shape aspects of the outer suspension of loudspeaker diaphragms

H04R2400/00

Loudspeakers

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

H04R2400/01

Transducers used as a loudspeaker to generate sound aswell as a microphone to detect sound

H04R2400/03

Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones

H04R2400/07

Suspension between moving magnetic core and housing

H04R2400/11

Aspects regarding the frame of loudspeaker transducers

H04R2400/13

Use or details of compression drivers

H04R2410/00

Microphones

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

H04R2410/01

Noise reduction using microphones having different directional characteristics

H04R2410/03

Reduction of intrinsic noise in microphones

H04R2410/05

Noise reduction with a separate noise microphone

H04R2410/07

Mechanical or electrical reduction of wind noise generated by wind passing a microphone

H04R2420/00

Details of connection covered by H04R, not provided for in its groups

H04R2420/01

Input selection or mixing for amplifiers or loudspeakers for hearing aids H04R25/43

H04R2420/03

Connection circuits to selectively connect loudspeakers or headphones to amplifiers

H04R2420/05

Detection of connection of loudspeakers or headphones to amplifiers

H04R2420/07

Applications of wireless loudspeakers or wireless microphones

H04R2420/09

Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones

H04R2430/00

Signal processing covered by H04R, not provided for in its groups

H04R2430/01

Aspects of volume control, not necessarily automatic, in sound systems

H04R2430/03

Synergistic effects of band splitting and sub-band processing

H04R2430/20

Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic H04R2203/12 takes precedence

H04R2430/21

Direction finding using differential microphone array [DMA]

H04R2430/23

Direction finding using a sum-delay beam-former

H04R2430/25

Array processing for suppression of unwanted side-lobes in directivity characteristics, e.g. a blocking matrix

H04R2440/00

Bending wave transducers covered by H04R, not provided for in its groups

H04R2440/01

Acoustic transducers using travelling bending waves to generate or detect sound

H04R2440/03

Resonant bending wave transducer used as a microphone

H04R2440/05

Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels

H04R2440/07

Loudspeakers using bending wave resonance and pistonic motion to generate sound

H04R2460/00

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

H04R2460/01

Hearing devices using active noise cancellation

H04R2460/03

Aspects of the reduction of energy consumption in hearing devices

H04R2460/05

Electronic compensation of the occlusion effect

H04R2460/07

Use of position data from wide-area or local-area positioning systems in hearing devices, e.g. program or information selection

H04R2460/09

Non-occlusive ear tips, i.e. leaving the ear canal open, for both custom and non-custom tips H04R2460/11 takes precedence

H04R2460/11

Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion

H04R2460/13

Hearing devices using bone conduction transducers

H04R2460/15

Determination of the acoustic seal of ear moulds or ear tips of hearing devices

H04R2460/17

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

H04R2499/00

Aspects covered by H04R or H04S not otherwise provided for in their subgroups

H04R2499/01

General technical reviews, overviews, tutorials

H04R2499/10

General applications

H04R2499/11

Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

H04R2499/13

Acoustic transducers and sound field adaptation in vehicles

H04R2499/15

Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops