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)
11/1990
11/07/1990EP0396300A2 Communications headset
11/06/1990US4969196 Speaker and horn array
11/06/1990US4967874 Microphone baffle apparatus
11/06/1990US4967872 Loud speaker system
11/01/1990WO1990012658A1 Process for manufacturing an acoustic sensor with an essentially non-detachable protective layer, and acoustic sensor so obtained
10/1990
10/30/1990US4966558 Coupler terminal unit for speaker
10/30/1990US4966252 Microphone windscreen and method of fabricating the same
10/25/1990DE4005849A1 Konuslautsprecher Cone speaker
10/23/1990US4965855 Automobile shaped miniature radio set
10/23/1990US4965839 Electro acoustic transducer and loudspeaker
10/23/1990US4965838 Ear piece transducer
10/23/1990US4965837 Environmentally resistant loudspeaker
10/23/1990US4965836 Stereo headphone
10/23/1990US4965775 Image derived directional microphones
10/23/1990US4964482 Loudspeaker enclosure
10/18/1990WO1990012475A1 Circuit for modulation and distribution of alternative electric power
10/17/1990EP0392649A2 Speaker
10/17/1990EP0392407A2 Sound-absorbing body
10/17/1990EP0391933A1 Method and device for generating sound in a space for people.
10/17/1990CN2064141U Voice coil lead wire of loudspeaker
10/16/1990US4964091 Electroacoustic transducer
10/04/1990WO1990011668A1 A loudspeaker cabinet
10/04/1990WO1990011667A1 Speaker mounting arrangement
10/04/1990DE4008646A1 Electrodynamic loudspeaker for mid-range frequencies - has membrane with outer and inner surface symmetrical to gap for neck of loudspeaker cone
10/03/1990EP0390758A2 A microphone amplifier for contact microphones
10/03/1990EP0390626A1 Sound reproduction unit
10/03/1990EP0390165A2 Speaker system
10/03/1990EP0390123A2 Nondirectional acoustic generator and speaker system
10/02/1990US4961227 Portable loud speaker system
10/02/1990US4961226 Stereo electroacoustical transducing
09/1990
09/27/1990DE3909353A1 Electrodynamic transducer
09/26/1990EP0389174A1 Wireless headphones
09/25/1990US4959674 Acoustic ink printhead having reflection coating for improved ink drop ejection control
09/25/1990US4958697 Anatomically shaped earseals for headsets
09/20/1990DE3904943A1 Loudspeaker arrangement for improving the acoustic sound impression in living rooms
09/18/1990US4957184 Loudspeaker enclosure
09/13/1990DE3904443A1 Sound reproduction picture frame
09/12/1990EP0386846A1 Electro-acoustic system
09/11/1990US4956868 Magnetically shielded electromagnetic acoustic transducer
09/11/1990US4955578 Resiliently fastened support device for a microphone
09/07/1990WO1990010362A1 Telephone earpiece cushion
09/05/1990EP0385897A1 Microechographic probe using ultrasound focusing through a deformable surface
09/05/1990EP0385889A1 Piezoelectric unit with a flat supporting surface and elastic holding elements
09/05/1990EP0385888A1 Piezoelectric unit with conductive elastic holding elements
09/04/1990US4953655 Acoustic apparatus
08/1990
08/29/1990EP0334843B1 Loudspeaker installation
08/28/1990US4953223 Speaker mounting system
08/28/1990US4953220 Mobile speaker system having an illumination effect
08/28/1990US4953219 Stereo signal reproducing system using reverb unit
08/27/1990CA2010977A1 Piezoelectric capsule with planer hearing and plexible support element
08/27/1990CA2010975A1 Piezoelectric capsule with conductive flexible support elements
08/23/1990WO1990009726A1 Cordless headset telephone
08/22/1990EP0383483A1 Earphone having resilient insertion device
08/21/1990US4949806 Headset for underwater use
08/16/1990EP0381796A1 Ultrasonic sensor
08/14/1990US4949386 Speaker system
08/14/1990US4949384 Driving apparatus
08/14/1990US4949377 Telephone sterilizer
08/14/1990US4948076 Speaker support stand
08/09/1990WO1990009083A1 Microphone for detecting bodily sounds
08/09/1990DE4001599A1 Loudspeaker housing - made of ceramic plates with optimum vibration mountings
08/08/1990EP0381498A2 Array microphone
08/08/1990CN2060273U Sound box with streamlined inverter pipe
08/07/1990US4947075 Piezoelectric insert with side electric connection clips
08/02/1990DE3902437A1 Bass reflex enclosure for bass loudspeakers for motor vehicles
08/01/1990EP0379988A1 Loudspeaker enclosure
08/01/1990CN1044376A Loudspeaker system
07/1990
07/26/1990DE3902062A1 Loudspeaker unit with a reflector
07/24/1990US4944019 Low sound region reproducing speaker system
07/24/1990US4942939 Speaker system with folded audio transmission passage
07/19/1990DE3901249A1 Loudspeaker enclosure
07/19/1990DE3901248A1 Bass loudspeaker enclosure
07/19/1990DE3901158A1 Directional microphone
07/18/1990EP0378337A2 Wire trap speaker terminal
07/18/1990EP0378021A1 Signal receiver insensitive to static pressure variations
07/17/1990US4942617 Earphone cord take-up device
07/12/1990WO1990007850A1 Improved mid-range loudspeaker assembly
07/12/1990WO1990007824A1 Electronic audio signal amplifier and loudspeaker system
07/12/1990WO1990007673A1 Viscoelastic damping system
07/11/1990EP0377316A2 Voice communication unit
07/11/1990EP0377262A2 A compact and efficient sub-woofer system and method for installation in structural partitions
07/11/1990EP0377142A2 Method and device for correcting a distortion of the loudness perception of a reproduced sound presentation
07/11/1990EP0377074A2 Hearing aid transducer
07/11/1990CN1043845A Signal sensor insensible to static pressure change
07/11/1990CN1043844A Analogue power generator
07/10/1990US4940108 Open line source speaker system
07/05/1990DE3900051A1 Receiver capsule
07/05/1990CA2002593A1 Compact and efficient sub-woofer system and method for installation in structural partitions
07/04/1990EP0375714A1 Loudspeaker.
07/04/1990CN2059038U Recorder loudspeak box rotary lighting according to sound lever
07/03/1990US4939783 Suspended speaker system
07/03/1990CA1271247A1 Load and dispersion cell for sound
07/03/1990CA1271128A1 Borehole imaging apparatus
06/1990
06/28/1990WO1990007103A1 Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit
06/28/1990DE3843051A1 Device for the direct conversion of digital signals into sound
06/28/1990DE3843033A1 High-sensitivity microphone
06/28/1990DE3842364A1 Loudspeaker enclosure
06/27/1990EP0374902A2 Microphone system for determining the direction and position of a sound source
06/26/1990US4937877 Modular microphone assembly
06/26/1990US4936410 Speaker cover
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