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)
06/1989
06/21/1989EP0320934A2 An antibacterical protection device for telephone handsets
06/20/1989US4840183 Electrocardiograph
06/15/1989WO1989005557A1 Natural headphones for conducting the human voice to the auditory system
06/15/1989DE3740653A1 Wide-band sound transducer system
06/15/1989DE3740643A1 Bass speaker system
06/14/1989EP0320270A2 Stereophonic sound output system with controlled directivity
06/13/1989US4839871 Underwater communication device
06/08/1989DE3739845A1 Television receiver with a loudspeaker enclosure
06/07/1989EP0319437A1 Acoustic enclosures
06/07/1989EP0319010A2 Microphone with frequency pre-emphasis
06/06/1989US4837839 Compact speaker assembly with improved low frequency response
06/06/1989US4837837 Loudspeaker
06/06/1989US4837836 Microphone pickup system
06/06/1989US4837835 Speaker system for motor vehicles with an alarm device
06/06/1989US4837833 Microphone with frequency pre-emphasis channel plate
06/06/1989US4837826 Stereophonic baffle
06/06/1989US4836329 Loudspeaker system with wide dispersion baffle
06/06/1989US4836328 Omnidirectional acoustic transducer
06/06/1989US4836327 Sound reinforcement enclosure employing cone loudspeaker with annular central loading member and coaxially mounted compression driver
06/06/1989US4836326 Optimal shadow omniphonic microphone and loudspeaker system
06/01/1989DE3810028C1 Stereo reproduction arrangement
06/01/1989DE3739290A1 Loudspeaker unit
05/1989
05/31/1989CN2038694U Wireless telephone transmitter for bus-dispatching with signal lamp
05/30/1989US4834212 Sound muffler for covering the mouth
05/24/1989EP0317167A1 Moisture barrier assembly
05/24/1989DE3738940A1 Sound generating device
05/24/1989DE3738698A1 Television receiver with a loudspeaker enclosure
05/24/1989CN2038303U Disinfection microphone cover with fragrance
05/23/1989US4832150 Sound-permeable cover for a loudspeaker
05/18/1989WO1989004581A1 Electro-acoustic transducers
05/18/1989WO1989004580A1 Microphone provided with earphone
05/18/1989DE3737846A1 Microphone with optical fibres, non-electric and non-metallic pick-up
05/17/1989CN2037908U Antenna for audio wireless earphone
05/16/1989US4831656 Conference microphone for use with hearing impaired amplification system
05/16/1989US4830138 Pressure ring for ear cover
05/16/1989EP0214130A4 Aerodynamic bass-reflex enclosure.
05/09/1989US4829581 Electrodynamic transducer comprising a two-part diaphragm
05/09/1989US4829571 Headphone
05/05/1989WO1989004106A1 Acoustic filter microphone cup
05/05/1989WO1989004096A1 Single-use hygienic device for telephone handsets
05/05/1989WO1989003919A1 A device for a meeting-hall
05/03/1989EP0314419A2 Electro-acoustic transducer
05/03/1989DE3835977A1 Hoerhilfe Hearing aid
05/03/1989CN2037130U Stereophonic sound box with sound source
05/02/1989CA1253440A1 Loudspeaker enclosures
04/1989
04/26/1989EP0313192A1 Dental lamp shield or prophylactic
04/25/1989US4823908 Directional loudspeaker system
04/25/1989US4823907 Balloon assembly
04/18/1989US4823327 Electroacoustic transducer
04/13/1989DE3732985A1 Multipath dipole acoustic transducer of highest quality according to the principle of mutually interleaved frequency ranges (regions)
04/11/1989US4821331 Coaxial speaker unit
04/11/1989US4821330 Wide-band loudspeaker having a diaphragm area divided into sub-areas for various frequency ranges
04/11/1989US4820753 Acoustic window and material therefor
04/11/1989US4819761 Tubular loudspeaker system
04/06/1989WO1989003161A1 Speaker system
04/06/1989DE3731366A1 Television receiver with a bass loudspeaker enclosure
04/05/1989EP0309857A2 Loudspeaker unit
04/04/1989US4819270 Stereo dimensional recording method and microphone apparatus
04/04/1989US4819265 Disposable cover for telephone
04/04/1989US4819264 Telephone sanitation device
03/1989
03/30/1989DE3826897A1 Otoplasty for sound transmission
03/28/1989US4817168 Directional microphone
03/28/1989US4817164 Electrostatic discharge protector for an electret microphone
03/28/1989US4817163 Loud-speaker combined with a device for producing lighting effects
03/28/1989US4817153 Method and apparatus for transforming a monaural signal into stereophonic signals
03/28/1989US4815560 Frequency)compensated hearing aid microphone assembly
03/28/1989US4815559 Portable loudspeaker apparatus for use in live performances
03/28/1989US4815558 Device for accomodating a loudspeaker into a cut-out of a sound panel
03/22/1989EP0307697A1 Hearing aid and method for making it
03/22/1989CN2034758U Mini-telephone transmitter and receiver for operator
03/21/1989US4815143 Wireless microphone
03/21/1989US4815049 Disappearing baffle for sonar arrays
03/14/1989US4811816 Symmetric double phonic diaphragm volume-enhancing device
03/09/1989DE3728571A1 Loudspeaker unit
03/09/1989DE3728481A1 Optical transmission system
03/07/1989US4811406 Compound speaker system
03/07/1989US4811405 Microphone mounting support
03/07/1989US4811403 Ultralight loudspeaker enclosures
03/07/1989US4811309 Microphone probe for acoustic measurement in turbulent flow
03/07/1989US4810913 Increased sensitivity piezoelectric hydrophones
03/07/1989US4809811 Ear pad construction for earphones
03/02/1989DE3721950A1 Frame of a loudspeaker
03/01/1989EP0305062A2 Speaker headrest
02/1989
02/28/1989US4809244 Support member for pressure sensor
02/23/1989WO1989001728A1 Loudspeaker
02/23/1989DE3727098A1 Bass loudspeaker enclosure
02/22/1989EP0303912A2 Woofer-loudspeaker box
02/21/1989US4807293 Loudspeaker housing
02/21/1989US4805731 Sound projection method and apparatus
02/21/1989US4805730 Loudspeaker enclosure
02/21/1989US4805729 Speaker enclosure
02/15/1989EP0303547A1 Omnidirectional wide-band elastic wave transducer
02/14/1989US4805221 Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes
02/14/1989CA1249971A1 Speaker adapted to corner-loaded installation
02/09/1989DE3724881A1 Thread fitting to a TV headset
02/07/1989US4802551 Loudspeaker unit
02/07/1989US4802243 Acoustic headgear-sun visor assembly
02/01/1989EP0301552A2 Dome-like speaker system
01/1989
01/31/1989US4802068 Foamed silicone
01/31/1989US4800983 Energized acoustic labyrinth
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