| Patents for H04R 1 - Details of transducers (42,173) |
|---|
| 03/16/1982 | US4320492 Variable weight phonograph cartridge |
| 03/16/1982 | US4320475 Monomodal optical fibre hydrophone operating by the elastooptical effect |
| 03/02/1982 | US4317965 Thin miniaturized dynamic-type loudspeaker |
| 02/24/1982 | EP0046388A1 Multi-way loudspeaker system |
| 02/23/1982 | US4317009 Coldproof reflex horn speaker |
| 02/18/1982 | WO1982000543A1 Apparatus and method for enhancing the frequency response of a loudspeaker |
| 02/17/1982 | EP0045989A2 Acoustic impedance matching device |
| 02/16/1982 | CA1118363A1 Varying loudspeaker spatial characteristics |
| 02/09/1982 | US4314620 Loudspeaker with cone driven horn |
| 02/03/1982 | EP0045145A2 Electroacoustic transducers |
| 02/02/1982 | US4313521 Speaker housing |
| 01/26/1982 | US4313032 Folded horn loudspeaker system |
| 01/26/1982 | US4312420 Sound diffusion plant with very low directivity |
| 01/20/1982 | EP0043995A1 Loudspeaker box and method for its manufacture |
| 01/20/1982 | EP0043864A1 Pick-up stylus with exchangeable mounting |
| 01/19/1982 | US4311874 Teleconference microphone arrays |
| 01/19/1982 | US4311872 Portable voice communication system |
| 01/19/1982 | CA1116739A1 Ultrasonic detection system maintains shields between adjacent transducers for suppression of sidelobes |
| 01/12/1982 | US4310917 Pick-up |
| 01/12/1982 | US4310730 Shielded piezoelectric acoustic pickup for mounting on musical instrument sounding boards |
| 01/06/1982 | EP0043195A1 Improvements in or relating to ultrasonic transducers |
| 01/05/1982 | US4309575 Apparatus for intercranial transmission of audio signals |
| 01/05/1982 | US4308932 Loudspeaker horn |
| 12/30/1981 | EP0042685A1 Transducers |
| 12/29/1981 | US4308431 Speaker with low mass driver |
| 12/29/1981 | US4308426 Simulated ear for receiving a microphone |
| 12/29/1981 | US4308425 Variable-directivity microphone device |
| 12/29/1981 | CA1115254A1 Hanger and method for sound speakers |
| 12/22/1981 | CA1114748A1 Low frequency folded exponential horn loudspeaker apparatus with bifurcated sound path |
| 12/16/1981 | EP0041799A1 Stereophonic pick-up cartridges |
| 12/15/1981 | US4306121 Electro-acoustic transducer assembly |
| 12/10/1981 | WO1981003595A1 Multi-way horn loudspeaker enclosure with electrical reverberation and digital power amplifier |
| 12/02/1981 | EP0040948A1 Method of making an electro dynamic transducer |
| 12/01/1981 | US4303807 Ultra-small portable sound reproducing apparatus |
| 12/01/1981 | US4303142 Combined acoustical transducer and grille |
| 11/25/1981 | EP0040281A1 Loudspeaker and enclosure system with digital encoding phase shifted crossover network and self contained digital power drive system, and a modular method of utilizing moulded inserts |
| 11/24/1981 | US4302728 Ultrasonic wave oscillator circuit with output meter |
| 11/24/1981 | US4302635 Headphone construction |
| 11/24/1981 | US4301889 Speaker enclosure |
| 11/18/1981 | EP0040063A1 Acoustic energy system |
| 11/18/1981 | EP0039740A1 Loud-speaker |
| 11/17/1981 | US4301332 Woofer loudspeaker |
| 11/17/1981 | CA1112579A1 Speaker apparatus |
| 11/10/1981 | US4300217 Acoustic transducer housing |
| 11/10/1981 | US4299304 Exponential folded horn speaker enclosure |
| 11/03/1981 | US4298087 Unidirectional speaker enclosure |
| 10/29/1981 | WO1981003100A1 Speaker with low mass driver |
| 10/28/1981 | EP0038430A1 Transmitter and receiver set to be carried on a protecting helmet |
| 10/27/1981 | US4297537 Dynamic loudspeaker |
| 10/27/1981 | US4297535 Stereo headset |
| 10/20/1981 | US4296482 Parametric array Doppler sonar apparatus |
| 10/20/1981 | US4296348 Interdigitated electrode ultrasonic transducer |
| 10/20/1981 | US4296280 Wall mounted speaker system |
| 10/14/1981 | EP0037620A1 Acoustic impedance matching device |
| 10/14/1981 | EP0037435A1 Connecting-element |
| 10/13/1981 | US4295006 Speaker system |
| 10/13/1981 | US4294354 Packaging case |
| 10/07/1981 | EP0037139A1 Loudspeaker enclosure |
| 10/06/1981 | US4293742 Microphone device |
| 10/06/1981 | CA1110176A1 Woofer efficiency |
| 09/30/1981 | EP0036577A1 Ultrasonic transducer array |
| 09/29/1981 | US4292561 Attenuating means for electroacoustic transducer |
| 09/23/1981 | EP0036353A1 Ultrasonic imaging probe with acoustic lens and echographic imaging system comprising such a probe |
| 09/15/1981 | US4289929 Loudspeaker and enclosure combination |
| 09/09/1981 | EP0035426A1 Electromechanic transducer with active suspension and process for its production |
| 09/09/1981 | EP0035222A1 Electro-acoustic transducer |
| 09/09/1981 | EP0035220A1 Electro-acoustic transducer |
| 09/08/1981 | US4288663 Noise canceling transmitter |
| 09/08/1981 | US4287770 Method for the manufacture of ultrasonic transducers |
| 09/02/1981 | EP0034844A1 A direction- and frequency-independent loudspeaker- or microphone-column or a loudspeaker- or microphone-surface |
| 09/02/1981 | EP0034730A1 Transducer disk for piezo-electric transducers |
| 09/02/1981 | EP0034596A1 Orthodynamic head-phones |
| 09/01/1981 | US4286688 Loudspeaker apparatus |
| 09/01/1981 | US4286470 Clamp-on ultrasonic transducer |
| 08/25/1981 | CA1107453A1 Ear-pads and assembly procedure |
| 08/18/1981 | US4284844 Loudspeaker system |
| 08/18/1981 | US4284168 Loudspeaker enclosure |
| 08/18/1981 | US4284166 Port devices for bass-reflex speaker enclosures |
| 08/18/1981 | CA1107384A1 Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device |
| 08/18/1981 | CA1107382A1 Electret microphone with simplified electrical connections by printed circuit board mounting |
| 08/11/1981 | US4283606 Coaxial loudspeaker system |
| 08/04/1981 | US4282453 Transducer apparatus for detecting airborne pressure pulse |
| 08/04/1981 | US4281738 Spherical loudspeaker enclosure |
| 08/04/1981 | CA1106293A1 Rear deck mounting adapter for car speaker |
| 07/28/1981 | US4281241 Firing range |
| 07/28/1981 | US4281224 Grille covered speaker assembly construction for compact automobiles and the like |
| 07/28/1981 | US4281222 Miniaturized unidirectional electret microphone |
| 07/28/1981 | US4280586 Speaker enclosure |
| 07/28/1981 | US4280585 Multi-sound speaker system |
| 07/21/1981 | US4280019 Combination acoustic conditioner and light fixture |
| 07/21/1981 | US4279691 Vapor deposition onto a metal pipe |
| 07/15/1981 | EP0032095A1 Acoustic radar antenna matching process and device for carrying it out |
| 07/14/1981 | US4278852 Earphone construction |
| 07/14/1981 | US4278000 Piezoelectric transducer for electrical string instruments and pickup means comprising the same |
| 07/07/1981 | US4277654 Stethoscopic headphone set |
| 07/07/1981 | US4277653 Speaker adapter |
| 07/07/1981 | CA1104504A1 Microphone assembly |
| 07/01/1981 | EP0031122A1 Electromagnetic pickup cartridge |
| 07/01/1981 | EP0031049A2 Acoustic transducer |
| 06/30/1981 | US4276446 Acoustic transducer system |