Patents for H04R 27 - Public address systems (2,454) |
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05/28/1997 | EP0728403A4 Voice transmission adaptor assembly |
05/14/1997 | CN2254259Y Multidirectional megaphone |
05/02/1997 | EP0771133A1 Multiple cone electroacoustic transducer |
04/29/1997 | US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system |
04/28/1997 | CA2188899A1 Multiple cone transducer |
04/16/1997 | EP0768014A1 A communication system for supplying information on objects on display by means of hand-held devices |
04/10/1997 | WO1997013239A1 Message output controller and system |
04/10/1997 | CA2233318A1 Message output controller and system |
04/01/1997 | US5617331 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles |
03/26/1997 | EP0710427B1 Sound pick-up and reproduction apparatus and use thereof for conference calls |
03/26/1997 | CN2250615Y infrared wireless loudspeaker box |
03/11/1997 | US5609320 Method and apparatus for mounting a bowling scoring monitor |
02/27/1997 | DE19530138A1 Multichannel audio system with central unit |
02/25/1997 | US5606624 Audio apparatus demonstrating |
02/06/1997 | WO1997004617A1 Personal listening device |
02/04/1997 | CA2056110C Public address intelligibility system |
01/30/1997 | WO1997003438A1 Acoustic wave focusing method and device |
01/22/1997 | EP0755045A2 Sound wave cancellation arrangement |
01/21/1997 | US5596647 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles |
12/25/1996 | CN2243758Y Audio main body with operation keys installed within top cover |
12/18/1996 | CN2243156Y Mini-size wired microphone |
12/11/1996 | EP0746959A1 Digitally controlled analog cancellation system |
12/04/1996 | EP0745964A1 Traffic information apparatus with multilingual message generator |
11/26/1996 | US5578987 Monitoring apparatus for an alarm device |
11/19/1996 | US5577128 Audio distribution system with controllable volume override |
11/19/1996 | US5576685 Sound generation apparatus responsive to environmental conditions for use in a public space |
11/14/1996 | WO1996036109A1 Distributed self-adjusting master-slave loudspeaker system |
11/14/1996 | WO1996029779A3 A method for implementing a sound reproduction system for a large space, and a sound reproduction system |
11/13/1996 | EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system |
11/06/1996 | EP0740894A1 Infrared communication systems |
11/05/1996 | US5572592 Remote control audio apparatus for hunters |
10/17/1996 | WO1996032804A1 Device and method for voice conference communication |
10/16/1996 | CN2237915Y Multifunctional audio amplifier |
10/03/1996 | WO1996031086A1 Improvements in or relating to loudspeakers |
09/26/1996 | WO1996029779A2 A method for implementing a sound reproduction system for a large space, and a sound reproduction system |
09/11/1996 | EP0606387B1 System for sound pick-up, apparatus for sound pick-up and reproduction |
08/28/1996 | EP0728403A1 Voice transmission adaptor assembly |
08/20/1996 | US5548272 Talking poster |
07/30/1996 | US5541998 Health club audio system |
07/24/1996 | EP0723380A1 Electronic information device, particularly emergency column |
07/18/1996 | WO1996021380A1 Method and apparatus for mounting a bowling scoring monitor |
07/03/1996 | EP0719493A1 Apparatus and method for reducing acoustic feedback |
06/12/1996 | EP0716403A1 Monitor apparatus of alarm apparatus |
06/06/1996 | WO1996017140A1 Sound arrangement |
06/05/1996 | CN1124079A Computer-to-telephone interface |
06/04/1996 | US5524059 Sound acquisition method and system, and sound acquisition and reproduction apparatus |
05/29/1996 | EP0713625A1 An audio processing system for teleconferencing |
05/28/1996 | US5522089 Personal digital assistant module adapted for initiating telephone communications through DTMF dialing |
05/08/1996 | EP0710427A1 Sound pick-up and reproduction apparatus and use thereof for conference calls |
05/01/1996 | CN2226359Y Microcomputerized electronic radio remote-control alarm |
04/09/1996 | US5506532 Output limiter for class-D BICMOS hearing aid output amplifier |
03/21/1996 | WO1996008759A1 Micro personal digital assistant |
03/13/1996 | EP0700622A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles |
02/28/1996 | EP0698326A1 Computer-to-telephone interface |
02/27/1996 | CA1338084C Multidimensional stereophonic sound reproduction system |
01/30/1996 | CA2077894C Improved audio distribution system |
01/11/1996 | WO1996001032A1 A communication system for supplying information on objects on display by means of hand-held devices |
01/11/1996 | WO1996000955A1 Monitor apparatus of alarm apparatus |
01/11/1996 | CA2194065A1 A communication system for supplying information on objects on display by means of hand-held devices |
01/09/1996 | US5483371 Lightwave distribution system for audio and video services and terminal equipment therefor |
01/02/1996 | US5481478 Broadcast system for a facility |
12/26/1995 | US5479516 Loudspeaker demonstrating |
12/13/1995 | CN1113334A Phonetic guiding apparatus |
10/31/1995 | US5463693 Voice amplification adapter assembly for face mask |
10/25/1995 | EP0678227A1 Audio distribution system with controllable volume override |
10/17/1995 | US5459813 Public address intelligibility system |
10/04/1995 | EP0674820A1 Lightwave distribution system for audio and video services and terminal equipment therefor |
09/27/1995 | EP0673588A1 Improved audio distribution system with independent audio control |
09/19/1995 | US5452360 Sound field control device and method for controlling a sound field |
08/16/1995 | EP0667730A1 Electrodynamic transducer of polar type with vibratory body |
08/08/1995 | US5440644 Audio distribution system having programmable zoning features |
08/08/1995 | US5440642 Analog noise cancellation system using digital optimizing of variable parameters |
07/18/1995 | US5434912 Audio processing system for point-to-point and multipoint teleconferencing |
07/11/1995 | US5432858 Enhanced concert audio system |
06/28/1995 | CN2202384Y Automatic accompanying wireless karaoke microphone device |
06/20/1995 | US5426706 Remote simultaneous interpretation system |
06/14/1995 | EP0520067B1 Improved audio distribution system |
06/01/1995 | DE4339632A1 Circuit arrangement for electronic acoustic system |
05/31/1995 | CN1028707C Portable type audio reproducing and loudening apparatus |
05/23/1995 | US5418337 Loudspeaker driver surrounding |
05/18/1995 | WO1995013689A1 Voice transmission adaptor assembly |
05/17/1995 | EP0653144A1 Concert audio system |
05/02/1995 | US5412734 Apparatus and method for reducing acoustic feedback |
04/20/1995 | WO1995010927A1 Improved audio distribution system with independent audio control |
04/20/1995 | WO1995010896A1 Lightwave distribution system for audio and video services and terminal equipment therefor |
04/20/1995 | WO1995010894A1 Audio distribution system with controllable volume override |
04/20/1995 | WO1995010831A1 Improvements in reverberators for use in wide band assisted reverberation systems |
04/20/1995 | CA2150130A1 Improved audio distribution system with independent audio control |
04/20/1995 | CA2150010A1 Lightwave distribution system for audio and video services and terminal equipment therefor |
04/20/1995 | CA2150008A1 Audio distribution system with controllable volume override |
04/11/1995 | US5406634 In a public address system |
04/06/1995 | WO1995009517A1 Infrared communication systems |
04/04/1995 | US5404343 Resting place marker with audio system |
03/30/1995 | WO1995008906A1 Digitally controlled analog cancellation system |
03/23/1995 | WO1995008249A1 Apparatus and method for reducing acoustic feedback |
03/22/1995 | EP0575598A4 Multi-zone audio distribution amplifier. |
03/15/1995 | EP0584299A4 Improved audio distribution system. |
03/14/1995 | US5398287 Voice activated multiple microphone electroacoustic amplifier system |
02/21/1995 | US5392455 Transducer with integrated switch element |
02/16/1995 | WO1995005047A1 An audio processing system for teleconferencing |