Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 1 - Details of transducers
Patents for H04R 1 - Details of transducers (42,173)
11/1991
11/14/1991WO1991017635A1 Hemispherical speaker system
11/13/1991EP0456416A2 Loudspeaker system
11/13/1991EP0455837A1 Ultrasonic resonator
11/10/1991WO1991017539A1 Loading of flextensional transducer shells
11/10/1991CA2079913A1 Loading of flextensional transducer shells
11/06/1991EP0455203A2 Dual outlet passage hearing aid transducer
11/06/1991EP0454931A1 Electronic stethoscopic apparatus
11/06/1991EP0446219A4 Loudspeaker system
11/02/1991CA2040004A1 Dual outlet passage hearing aid transducer
10/1991
10/31/1991WO1991016808A1 Ceiling speaker system
10/31/1991WO1991016798A1 Audio transducer system
10/29/1991US5062140 Induction speaker
10/29/1991US5062139 Coaxial loud speaker system
10/29/1991CA1291466C Dental lamp shield or prophylactic
10/23/1991EP0453230A2 Speaker system
10/23/1991EP0452486A1 Face mask apparatus
10/23/1991EP0452370A1 Viscoelastic damping system
10/22/1991US5060274 Hydrostatic speaker and speaker driver
10/17/1991WO1991015420A1 Moveable stereo sound system
10/16/1991EP0451991A2 Speaker system and TV with the same
10/16/1991EP0451885A1 Audio or video apparatus with in-built loud-speaker
10/16/1991EP0289503B1 Sound emitter
10/16/1991CN2086955U Multifunctional microphone
10/15/1991US5058171 Microphone arrangement
10/15/1991US5058170 Array microphone
10/15/1991US5058169 Public address system
10/15/1991US5056618 Loudspeaker housing
10/15/1991US5056616 Loudspeaker
10/15/1991US5056161 Headset having reduced width nested bands which are grasped by earcup supporting block
10/10/1991WO1991015933A1 Device for improving bass reproduction in loudspeaker systems with closed housings
10/09/1991EP0450685A1 Apparatus for sound reproduction
10/08/1991US5056069 Ultrasonic sensor
10/02/1991DE4010815A1 Microphone system for human utterances - has belt for one or more directional microphones worn by user
10/01/1991US5054085 Preprocessing system for speech recognition
10/01/1991US5054080 Pneumatic loudspeaker with a continuous pressurized fluid flow
10/01/1991US5054079 Bone conduction microphone with mounting means
10/01/1991US5054063 Disposable sanitary telephone cover
09/1991
09/26/1991DE4109758A1 Loudspeaker unit with active auxiliary speaker - has two adjacent chambers with auxiliary speaker supported by common partition wall
09/26/1991DE4108163A1 Helmet communication system - has microphone and loudspeaker supported by respective sections of flexible or deformable carrier
09/25/1991EP0448291A2 Ultrasonic probe having rotary refracting member
09/25/1991EP0448110A2 Headphone apparatus
09/24/1991US5051964 Virtual microphone apparatus and method
09/24/1991US5051799 Digital output transducer
09/19/1991WO1991014350A1 Microphone operating on body-borne noise
09/19/1991DE4008713A1 Pressure gradient microphone with adjustable proximity effect - has adjustable mechanical change of spacing between transducer capsule and main sound inlet aperture
09/19/1991DE4008595A1 Microphone for close speech avoiding background noise - has two sound receivers at slight manual spacing in range of their sensitive surfaces
09/18/1991EP0446219A1 Loudspeaker system
09/17/1991WO1991014351A1 Multipurpose headwear
09/17/1991US5050137 Ultrasonic probe
09/17/1991US5048789 Microphone stand
09/17/1991CA2078328A1 Multipurpose headwear
09/11/1991EP0423172A4 Active noise reduction system
09/10/1991US5048092 Electroacoustic transducer apparatus
09/10/1991US5048089 Portable, removably attached speaker assembly
09/10/1991US5046581 Loudspeaker system
09/10/1991US5046192 Headset sun visor
09/10/1991CA1288612C Support member for pressure sensor
09/05/1991WO1991013525A1 Earwax trap for use with hearing-aid apparatus, and hearing-aid apparatus with such a trap
09/04/1991CN2084264U Changeover plug for earphone
09/04/1991CN2084255U Sterilization piece for mouthpiece of telephone
09/03/1991US5046104 Loudspeaker system
08/1991
08/29/1991DE4004780A1 Ecologically good loudspeaker housings - are made up of hollow fibre-reinforced concrete components, have favourable acoustic properties and are free from standing waves
08/28/1991EP0442969A1 Wholly microfabricated biosensors and process for the manufacture and use thereof
08/28/1991EP0442912A1 Loudspeaker arrangement.
08/28/1991CN2083820U Multi-person used earphone
08/28/1991CN2083819U Separated induction type head wireless earphone
08/22/1991DE4108409A1 Acoustic coupler for loudspeaker - uses ring shaped horn structure formed from two circular shells standing back to back
08/21/1991CN2083373U Loud-speaker for underwater or in the high-humidity air
08/20/1991US5041849 Multi-discrete-phase Fresnel acoustic lenses and their application to acoustic ink printing
08/20/1991CA1287914C Ear microphone
08/14/1991CN1053875A Portable type audio reproducing and loudening apparatus
08/08/1991DE4003585A1 Device for telephone user protection against aural infection - comprises disinfectant-impregnated cap fitted over earpiece, with reinforced frame and tab facilitating removal for disposal
08/06/1991US5036946 Speaker system
08/06/1991CA1287394C Multiple loudspeaker with piezoelectric "tweeter" supported in such away as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm
08/06/1991CA1287375C Mounting structure of a small-sized acoustic component
07/1991
07/31/1991EP0439309A2 Apparatus for reproducing and amplifying sound
07/31/1991EP0363425A4 Loudspeaker mounting
07/30/1991US5035005 Inflight headset for civil aircraft
07/25/1991WO1991011078A1 Earphone device
07/23/1991US5033577 Room sound reproducing
07/19/1991CA2008168A1 Cover for personal communication device
07/17/1991EP0437323A2 Hearing aid
07/17/1991EP0437145A1 Piezoelectric transducer
07/17/1991CN2081179U Integrally formed combined microphone head
07/16/1991US5033094 Adjustable headset
07/16/1991US5031626 Extracorporeal lithotripsy apparatus with an ultrasound locating system
07/11/1991DE4000132A1 Loudspeaker enclosure - lined with convex sound reflecting and absorbing panel(s) prevents unwanted resonance(s)
07/10/1991EP0436160A2 Microphone stand
07/10/1991EP0435914A1 Loudspeaker
07/09/1991US5031220 Mobile stereo speaker set
07/03/1991EP0434931A2 Multi-discrete-phase Fresnel acoustic lenses and their applications to acoustic ink printing
07/03/1991CN2080279U Sound control colour lamp sound box
07/03/1991CN2080278U Hand megaphone vocal accompaninent device
07/03/1991CA2031646A1 Microphone stand
07/02/1991US5029215 Automatic calibrating apparatus and method for second-order gradient microphone
07/02/1991US5029148 Flextensional
06/1991
06/27/1991WO1991009507A1 Manifold loudspeaker system
06/26/1991EP0433704A2 Loudspeaker housing case
06/25/1991US5026016 Retainer clip
06/25/1991US5025886 Multi-ported and multi-directional loudspeaker system
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