| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 04/14/1992 | US5105394 Constrained diaphragm transducer |
| 04/14/1992 | US5103927 Variable pattern, collapsible, directional transducer |
| 04/09/1992 | DE4042315A1 Acoustic coupling system for handsets |
| 04/08/1992 | EP0479604A2 Method and apparatus for presentation of on-line directional sound |
| 04/08/1992 | EP0479317A2 Method of manufacturing a loudspeaker damper and loudspeakerdämper resulting from such method |
| 04/08/1992 | EP0478979A2 Electrodynamic loudspeaker |
| 04/08/1992 | CN1060192A Acoustic transmitter |
| 04/08/1992 | CN1060185A Noise eliminating element and electrical circuit having same |
| 04/07/1992 | US5103482 Apparatus and method for reproducing high fidelity sound |
| 04/07/1992 | US5101816 Separable valve assembly |
| 04/02/1992 | DE4028057A1 Camcorder TV camera with microphone - has housing with noise receiver, whose output voltage is subtracted from microphone output signal |
| 03/31/1992 | US5101384 Acoustic devices |
| 03/31/1992 | US5099948 Compact woofer speaker system |
| 03/29/1992 | WO1992006567A1 Acoustic transmitter |
| 03/25/1992 | EP0476082A1 Device for improving bass reproduction in loudspeaker systems with closed housings. |
| 03/25/1992 | CN2100068U Minisize wireless microphone |
| 03/24/1992 | US5099519 Headphones |
| 03/17/1992 | US5097514 Approximating the movement of a vibrating surface |
| 03/17/1992 | US5097513 Speaker system enclosure integrated with amplifier circuit board |
| 03/17/1992 | US5096252 Truck cab speaker and seat organization |
| 03/17/1992 | CA1297579C Piezo-electric transducer with several coaxial sensitive elements |
| 03/17/1992 | CA1297578C Modular microphone assembly |
| 03/17/1992 | CA1297575C Hearing aid transducer |
| 03/11/1992 | EP0474167A2 Method of mounting loudspeakers and device therefor |
| 03/11/1992 | CN2098774U Multifunctional combined miniature sound enclosure |
| 03/11/1992 | CN2098773U Frame-type earphone |
| 03/10/1992 | US5095509 Audio reproduction utilizing a bilevel switching speaker drive signal |
| 03/10/1992 | US5095382 Wireless headphone |
| 03/07/1992 | WO1992004792A1 Noise-cancelling handset |
| 03/05/1992 | DE4133412A1 Loudspeaker housing with reduced characteristic resonance - has apertured housing walls with foam layers providing separation from adjacent components |
| 03/05/1992 | DE4027811A1 Damping system for loudspeaker housing - has oscillation system converting received sound waves into mechanical oscillations |
| 03/05/1992 | DE4027448A1 Damping mounting for microphone capsule - has concentric spring element and damping element with viscous paste in gap between them |
| 03/04/1992 | CN2098134U Ear inner tunica microphone |
| 03/03/1992 | US5093865 Reflecting sound imaging speaker enclosure |
| 03/03/1992 | US5092424 Electroacoustical transducing with at least three cascaded subchambers |
| 02/26/1992 | EP0471990A2 Double-coil loudspeaker |
| 02/26/1992 | CN2097491U Microphone |
| 02/25/1992 | US5091958 Wiring structure of loudspeaker |
| 02/25/1992 | US5091892 Expandable sonar array structure |
| 02/25/1992 | CA1296418C Microphone with frequency pre-emphasis |
| 02/20/1992 | WO1992003024A1 Panel-form loudspeaker |
| 02/20/1992 | DE4126122A1 Loudspeaker fixture with smaller surface for grille attachment - is distinguished by snap-on part for holding together shaped surfaces of grille and bordered frame |
| 02/20/1992 | DE4040292C1 Loudspeaker focusing with good acoustic resonance characteristics - has gap between two moulds filled with mineral mixture, e.g. sand and cement of gypsum plaster |
| 02/18/1992 | US5088574 Ceiling speaker system |
| 02/12/1992 | CN2096179U Telescopic sound box |
| 02/11/1992 | US5086871 Omnidirectional electro-accoustical chamber |
| 02/06/1992 | WO1992002107A1 Hydraulic lever actuator |
| 02/06/1992 | WO1992002012A1 Composite acoustic system for telephone hand-sets |
| 02/06/1992 | DE4024758A1 Car mounted loudspeaker with rigid basket - has decoration ring releasably coupled to basket flange from outside |
| 02/05/1992 | CN1015415B Modular microphone assembly |
| 02/04/1992 | CA1295410C Adjustable tension support band for headset |
| 02/04/1992 | CA1295408C Headset having a post auricle mount and arranged to be worn on a person's outer ear |
| 01/30/1992 | DE4120331A1 Multidirectional loudspeaker box with very deep woofer - radiates rearwards in housing defined aperture(s), rated for max. woofer rise |
| 01/29/1992 | EP0468610A2 Method and apparatus for performing noise cancelling in headphones |
| 01/29/1992 | CN2094840U Ear phone |
| 01/28/1992 | CA2047855A1 Method and apparatus for performing noise cancelling and headphoning |
| 01/22/1992 | CN2094166U Ear-muff type earphone |
| 01/21/1992 | US5082084 Extensible sound case |
| 01/21/1992 | US5082083 Structure wall mounted speaker assembly |
| 01/16/1992 | DE4021000A1 HI=FI loudspeaker with sprung coupling member - has mechanical oscillation element controlled by movement of electrical conductor within magnetic field |
| 01/15/1992 | EP0466676A2 Hearing aid with a directive microphone having variable directivity |
| 01/15/1992 | EP0465971A2 Combination head-protective helmet & communications system |
| 01/15/1992 | CN2093488U Multi-channel earphone socket |
| 01/14/1992 | US5081683 Loudspeakers |
| 01/14/1992 | CA1294360C Ring-shell projector |
| 01/08/1992 | EP0464220A1 Earphone device |
| 01/08/1992 | CN2092841U Sound header of microphone |
| 01/08/1992 | CN2092840U Box baffle with waterproof loudspeaker |
| 12/31/1991 | US5076260 Sensible body vibration |
| 12/27/1991 | EP0462571A1 Loudspeaker arrangement in television receiver cabinet |
| 12/26/1991 | WO1991020162A1 Speaker for use in a sound output system |
| 12/26/1991 | WO1991020161A1 An ear protector |
| 12/18/1991 | EP0452370A4 Viscoelastic damping system |
| 12/17/1991 | US5073948 Midrange loudspeaker driver |
| 12/17/1991 | US5073947 Hearing device for a protective helmet |
| 12/17/1991 | US5073946 Thin speaker having an enclosure with an open portion and a closed portion |
| 12/17/1991 | US5073945 Loudspeaker system |
| 12/17/1991 | US5073944 Audio system for automotive vehicles |
| 12/17/1991 | US5073937 Hydrodynamically pressure regulated loudspeaker systems |
| 12/17/1991 | US5073936 Stereophonic microphone system |
| 12/15/1991 | WO1991020109A1 Microwave antennas |
| 12/15/1991 | CA2085131A1 Microwave antennas |
| 12/12/1991 | WO1991019408A1 Loudspeaker assembly with multi-cellar diaphragm |
| 12/12/1991 | WO1991019406A1 Speaker system |
| 12/12/1991 | WO1991019405A1 Loudspeaker with a diaphragm having an air conduit |
| 12/05/1991 | DE4017554A1 Sound reception device for percussion drum - comprises microphone supported at free end of holder within drum interior |
| 12/04/1991 | EP0459682A2 Speaker cabinet with energy absorbent means |
| 12/04/1991 | EP0353226B1 Housing for an entertainment electronics appliance |
| 12/04/1991 | CN2090134U Simple earplug |
| 12/04/1991 | CN2090133U Multifunction earphone |
| 12/04/1991 | CN2090132U Joiner for mike lead join |
| 11/28/1991 | DE4104514A1 Loudspeaker box housing for easy assembly - has interfitting profile and plate elements |
| 11/27/1991 | EP0458046A2 Handset for telephone apparatus |
| 11/26/1991 | US5068901 Dual outlet passage hearing aid transducer |
| 11/26/1991 | US5067583 Polymer-filled audio loudspeaker cabinet |
| 11/21/1991 | EP0457487A2 Horn speaker |
| 11/21/1991 | EP0456968A2 Piezoelectric transducer |
| 11/19/1991 | US5067159 Structure of a speaker apparatus |
| 11/19/1991 | CA1292308C Transducer device |
| 11/15/1991 | CA2016766A1 Method for decreasing vibration of loudspeaker enclosures |