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)
06/1990
06/23/1990CA2006565A1 Signal sensor insensitive to static pressure variations
06/20/1990EP0373816A2 Electroacoustic transducer apparatus
06/19/1990US4934998 Prenatal audio apparatus
06/19/1990US4934480 Device for the fastening of covers or panels for the decoration and shielding of instruments, especially electrical and electronic instruments
06/14/1990WO1990006662A1 Device for avoiding direct mouth and ear contact with the transmitter and receiver of public on private telephone handsets
06/14/1990WO1990006661A1 Loudspeaker system
06/13/1990EP0372883A2 Headphone device
06/13/1990EP0372830A2 Room sound reproducing
06/13/1990EP0372186A1 Loudspeaker boxes for a television set and other apparatuses
06/12/1990US4933982 Bass reflex type speaker system duct having multiple sound paths
06/12/1990US4933981 Sound system
06/06/1990CA2004581A1 Room sound reproducing
06/05/1990US4930742 Rearview mirror and accessory mount for vehicles
06/05/1990US4930596 Loudspeaker system
06/05/1990US4930520 Earpiece for auditory testing of infants
06/02/1990CA2004558A1 Headphone device
05/1990
05/31/1990WO1990005910A1 Wholly microfabricated biosensors and process for the manufacture and use thereof
05/30/1990EP0370619A2 Multiple loudspeaker sound system for a video display device
05/29/1990US4928914 Tiltable mounting bracket
05/29/1990US4928788 Ported automotive speaker enclosure apparatus and method
05/29/1990US4928787 Mobile speaker system
05/23/1990EP0369434A2 Speaker damper configuration
05/23/1990EP0369127A2 Compound ultrasonar sonar transducer
05/22/1990US4928312 Acoustic transducer
05/22/1990US4926961 Use with communications equipment
05/17/1990WO1990005434A1 Loudspeaker arrangement
05/17/1990WO1990005433A1 Communication method and equipment
05/16/1990EP0368355A2 Conference box
05/15/1990US4926487 Speaker system
05/15/1990US4926486 Transducer assembly for automatic message system
05/15/1990US4926398 Pressure compensated communication system
05/15/1990US4924965 Speaker system
05/15/1990US4924964 Loudspeaker enclosure
05/15/1990US4924963 Compact and efficient sub-woofer system and method for installation in structural partitions
05/15/1990US4924962 Sound reproducing apparatus for use in vehicle
05/10/1990DE3937090A1 Schallbox fuer tonwandlung Schallbox for tonwandlung
05/09/1990CN1042036A Speaker assembly
05/08/1990US4924502 Means for stabilizing sound pressure produced at the eardrum under an earpad
05/08/1990US4923032 Ceiling panel sound system
05/08/1990US4923031 High output loudspeaker system
05/07/1990CA2002034A1 Acoustic box for sound transduction
05/03/1990WO1990004908A1 Headgear and clamp for positioning audio transducer
05/01/1990US4922542 Headphone comfort
05/01/1990US4922541 Acoustic horn audio reproducer
05/01/1990CA1268537A1 Second order toroidal microphone
04/1990
04/24/1990US4920564 Moisture barrier assembly
04/24/1990US4919369 Loudspeaker mounting mechanism
04/24/1990US4919227 Tamper resistant speaker grille for intercom module
04/19/1990DE3835258A1 Damping device for damping popping noises
04/18/1990EP0363425A1 Loudspeaker mounting
04/18/1990EP0363376A1 Procedure and device for facilitating audiovisual observation of a distant object
04/17/1990US4918738 Structural assembly for housing an acoustical system
04/17/1990US4918666 Tubular piezo-electric sensor with high sensitivity
04/17/1990US4917504 Communications headset
04/17/1990US4917212 Speaker supporting unit
04/11/1990EP0363082A2 Headphone devices
04/11/1990EP0363032A2 Flextensional transducers
04/10/1990US4916675 Broadband omnidirectional electroacoustic transducer
04/10/1990US4915647 Wire trap speaker terminal
04/05/1990WO1990003711A1 Loudspeaker
04/05/1990WO1990003708A1 Electrodynamic-fluidic transducer element for pneumatic loudspeaker
04/05/1990WO1990003136A1 Headrest and headrest-carrying movable body
04/05/1990CA2000147A1 Air-gap hydrophone
04/04/1990EP0362097A1 Omnidirectional electroacoustic enclosure
04/04/1990EP0362068A1 Electrodynamic-fluidic transducer equipment for a pneumatic loudspeaker
04/04/1990EP0361642A2 Coupler terminal unit for speaker
04/04/1990EP0361445A2 Acoustic apparatus
04/04/1990EP0361444A2 Driving apparatus
04/04/1990EP0361249A1 Sound reproduction set for screens
03/1990
03/29/1990DE3832617A1 Loudspeaker for a digital control signal
03/29/1990DE3832616A1 Loudspeaker
03/28/1990EP0360517A2 Sound reproducing apparatus
03/28/1990CN2055311U Earplug unit made of retard-resilience foam material
03/27/1990CA1267217A1 Earphone
03/21/1990EP0359191A2 Apex loudspeaker
03/21/1990CN2054962U Folding dynamic stereo headphones
03/20/1990US4910795 Wireless hand held microphone
03/15/1990DE3830461A1 Loudspeaker for a digital control signal
03/14/1990EP0357722A1 Nonresonant sound transducer/radiator system
03/14/1990CN2054602U 多功能话筒 Multifunction Microphone
03/13/1990US4908737 Mounting structure of a small-sized acoustic component
03/13/1990US4907671 Wide dispersion reflector
03/08/1990WO1990002470A1 Adjustable headphones grip mechanism
03/07/1990EP0357402A2 Sound imaging method and apparatus
03/07/1990EP0356871A2 Loudspeaker arrangement for a HDTV receiver
03/07/1990CN2054244U Wall hanging type ultra thin speaker with picture
03/07/1990CN2054243U Pyramid type speaker
03/06/1990US4905860 Speaker box
03/06/1990US4905788 Electro-acoustic transducers
02/1990
02/28/1990EP0355694A2 Piezoelectric composite transducer for use in ultrasonic probe
02/28/1990EP0355178A1 Apparatus for the contactless desintegration of concrements in a living thing body
02/28/1990EP0355177A1 Apparatus for the contactless desintegration of concrements in a living thing body
02/28/1990EP0355175A1 Apparatus for the contactless disintegration of concrements in the body of a living being
02/28/1990EP0222813B1 Improvements in or relating to microphones
02/27/1990US4905276 Telephone earpiece extension attachment
02/27/1990US4903703 Conversation device of MR imaging apparatus
02/20/1990US4903300 Compact and efficient sub-woofer system and method for installation in structural partitions
02/13/1990US4901356 For a protective face mask
02/13/1990US4901355 Combination multiple supported variable position audio intake control devices
02/08/1990DE3826294A1 Hands-free device for communications systems
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