Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 27 - Public address systems
Patents for H04R 27 - Public address systems (2,454)
05/1997
05/28/1997EP0728403A4 Voice transmission adaptor assembly
05/14/1997CN2254259Y Multidirectional megaphone
05/02/1997EP0771133A1 Multiple cone electroacoustic transducer
04/1997
04/29/1997US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system
04/28/1997CA2188899A1 Multiple cone transducer
04/16/1997EP0768014A1 A communication system for supplying information on objects on display by means of hand-held devices
04/10/1997WO1997013239A1 Message output controller and system
04/10/1997CA2233318A1 Message output controller and system
04/01/1997US5617331 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles
03/1997
03/26/1997EP0710427B1 Sound pick-up and reproduction apparatus and use thereof for conference calls
03/26/1997CN2250615Y infrared wireless loudspeaker box
03/11/1997US5609320 Method and apparatus for mounting a bowling scoring monitor
02/1997
02/27/1997DE19530138A1 Multichannel audio system with central unit
02/25/1997US5606624 Audio apparatus demonstrating
02/06/1997WO1997004617A1 Personal listening device
02/04/1997CA2056110C Public address intelligibility system
01/1997
01/30/1997WO1997003438A1 Acoustic wave focusing method and device
01/22/1997EP0755045A2 Sound wave cancellation arrangement
01/21/1997US5596647 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles
12/1996
12/25/1996CN2243758Y Audio main body with operation keys installed within top cover
12/18/1996CN2243156Y Mini-size wired microphone
12/11/1996EP0746959A1 Digitally controlled analog cancellation system
12/04/1996EP0745964A1 Traffic information apparatus with multilingual message generator
11/1996
11/26/1996US5578987 Monitoring apparatus for an alarm device
11/19/1996US5577128 Audio distribution system with controllable volume override
11/19/1996US5576685 Sound generation apparatus responsive to environmental conditions for use in a public space
11/14/1996WO1996036109A1 Distributed self-adjusting master-slave loudspeaker system
11/14/1996WO1996029779A3 A method for implementing a sound reproduction system for a large space, and a sound reproduction system
11/13/1996EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system
11/06/1996EP0740894A1 Infrared communication systems
11/05/1996US5572592 Remote control audio apparatus for hunters
10/1996
10/17/1996WO1996032804A1 Device and method for voice conference communication
10/16/1996CN2237915Y Multifunctional audio amplifier
10/03/1996WO1996031086A1 Improvements in or relating to loudspeakers
09/1996
09/26/1996WO1996029779A2 A method for implementing a sound reproduction system for a large space, and a sound reproduction system
09/11/1996EP0606387B1 System for sound pick-up, apparatus for sound pick-up and reproduction
08/1996
08/28/1996EP0728403A1 Voice transmission adaptor assembly
08/20/1996US5548272 Talking poster
07/1996
07/30/1996US5541998 Health club audio system
07/24/1996EP0723380A1 Electronic information device, particularly emergency column
07/18/1996WO1996021380A1 Method and apparatus for mounting a bowling scoring monitor
07/03/1996EP0719493A1 Apparatus and method for reducing acoustic feedback
06/1996
06/12/1996EP0716403A1 Monitor apparatus of alarm apparatus
06/06/1996WO1996017140A1 Sound arrangement
06/05/1996CN1124079A Computer-to-telephone interface
06/04/1996US5524059 Sound acquisition method and system, and sound acquisition and reproduction apparatus
05/1996
05/29/1996EP0713625A1 An audio processing system for teleconferencing
05/28/1996US5522089 Personal digital assistant module adapted for initiating telephone communications through DTMF dialing
05/08/1996EP0710427A1 Sound pick-up and reproduction apparatus and use thereof for conference calls
05/01/1996CN2226359Y Microcomputerized electronic radio remote-control alarm
04/1996
04/09/1996US5506532 Output limiter for class-D BICMOS hearing aid output amplifier
03/1996
03/21/1996WO1996008759A1 Micro personal digital assistant
03/13/1996EP0700622A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles
02/1996
02/28/1996EP0698326A1 Computer-to-telephone interface
02/27/1996CA1338084C Multidimensional stereophonic sound reproduction system
01/1996
01/30/1996CA2077894C Improved audio distribution system
01/11/1996WO1996001032A1 A communication system for supplying information on objects on display by means of hand-held devices
01/11/1996WO1996000955A1 Monitor apparatus of alarm apparatus
01/11/1996CA2194065A1 A communication system for supplying information on objects on display by means of hand-held devices
01/09/1996US5483371 Lightwave distribution system for audio and video services and terminal equipment therefor
01/02/1996US5481478 Broadcast system for a facility
12/1995
12/26/1995US5479516 Loudspeaker demonstrating
12/13/1995CN1113334A Phonetic guiding apparatus
10/1995
10/31/1995US5463693 Voice amplification adapter assembly for face mask
10/25/1995EP0678227A1 Audio distribution system with controllable volume override
10/17/1995US5459813 Public address intelligibility system
10/04/1995EP0674820A1 Lightwave distribution system for audio and video services and terminal equipment therefor
09/1995
09/27/1995EP0673588A1 Improved audio distribution system with independent audio control
09/19/1995US5452360 Sound field control device and method for controlling a sound field
08/1995
08/16/1995EP0667730A1 Electrodynamic transducer of polar type with vibratory body
08/08/1995US5440644 Audio distribution system having programmable zoning features
08/08/1995US5440642 Analog noise cancellation system using digital optimizing of variable parameters
07/1995
07/18/1995US5434912 Audio processing system for point-to-point and multipoint teleconferencing
07/11/1995US5432858 Enhanced concert audio system
06/1995
06/28/1995CN2202384Y Automatic accompanying wireless karaoke microphone device
06/20/1995US5426706 Remote simultaneous interpretation system
06/14/1995EP0520067B1 Improved audio distribution system
06/01/1995DE4339632A1 Circuit arrangement for electronic acoustic system
05/1995
05/31/1995CN1028707C Portable type audio reproducing and loudening apparatus
05/23/1995US5418337 Loudspeaker driver surrounding
05/18/1995WO1995013689A1 Voice transmission adaptor assembly
05/17/1995EP0653144A1 Concert audio system
05/02/1995US5412734 Apparatus and method for reducing acoustic feedback
04/1995
04/20/1995WO1995010927A1 Improved audio distribution system with independent audio control
04/20/1995WO1995010896A1 Lightwave distribution system for audio and video services and terminal equipment therefor
04/20/1995WO1995010894A1 Audio distribution system with controllable volume override
04/20/1995WO1995010831A1 Improvements in reverberators for use in wide band assisted reverberation systems
04/20/1995CA2150130A1 Improved audio distribution system with independent audio control
04/20/1995CA2150010A1 Lightwave distribution system for audio and video services and terminal equipment therefor
04/20/1995CA2150008A1 Audio distribution system with controllable volume override
04/11/1995US5406634 In a public address system
04/06/1995WO1995009517A1 Infrared communication systems
04/04/1995US5404343 Resting place marker with audio system
03/1995
03/30/1995WO1995008906A1 Digitally controlled analog cancellation system
03/23/1995WO1995008249A1 Apparatus and method for reducing acoustic feedback
03/22/1995EP0575598A4 Multi-zone audio distribution amplifier.
03/15/1995EP0584299A4 Improved audio distribution system.
03/14/1995US5398287 Voice activated multiple microphone electroacoustic amplifier system
02/1995
02/21/1995US5392455 Transducer with integrated switch element
02/16/1995WO1995005047A1 An audio processing system for teleconferencing
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