| Patents for H04R 27 - Public address systems (2,454) |
|---|
| 02/02/2000 | EP0976200A1 Vehicular loudspeaker system |
| 01/18/2000 | US6015026 Acoustical diffuser assembly and method of installation |
| 01/18/2000 | US6015025 Diffuser panel with built-in speaker arrangement and methods of installation |
| 01/13/2000 | DE19830620A1 Transmission and processing method for audio frequency signals |
| 01/12/2000 | EP0842508B1 Acoustic wave focusing method and device |
| 01/05/2000 | CN2357458Y Movable mounting for loadspeaker box |
| 12/29/1999 | WO1999053612A8 User adjustable volume control that accommodates hearing |
| 12/29/1999 | EP0967833A2 PA system having zone isolator circuits |
| 12/08/1999 | EP0716403B1 Monitor apparatus of alarm apparatus |
| 12/01/1999 | EP0713625A4 An audio processing system for teleconferencing |
| 11/30/1999 | US5993314 Method and apparatus for interactive audience participation by audio command |
| 10/21/1999 | WO1999053612A1 User adjustable volume control that accommodates hearing |
| 10/21/1999 | CA2328353A1 User adjustable volume control that accommodates hearing |
| 10/20/1999 | CN1232362A Auricular device for hypoacusic patients |
| 10/13/1999 | CN2343730Y 无源分频器 Passive crossover |
| 10/07/1999 | WO1999051010A1 Distributing environmental sound/paging via telephone extensions |
| 10/06/1999 | CN2342539Y Loudspeaker with short circuit and overload protection function |
| 09/22/1999 | EP0944035A2 Method and apparatus for the focalisation of acoustic waves |
| 09/14/1999 | US5953432 Line source speaker system |
| 09/14/1999 | US5953429 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles |
| 08/31/1999 | US5946401 Linear speaker array |
| 08/26/1999 | WO1999042984A1 Light emitting diode dot matrix display system with audio output |
| 08/24/1999 | US5941905 Public alarm for cochlear implant |
| 08/19/1999 | WO1999041880A1 Teleconferencing method and apparatus with three-dimensional sound positioning |
| 08/18/1999 | EP0936841A1 Auricular device for patients with hypoacusis |
| 08/18/1999 | CN2334131Y Wire broadcasting megaphone for use in countryside |
| 08/17/1999 | US5940118 System and method for steering directional microphones |
| 08/03/1999 | CA2174271C Microphone selection process for use in a multiple microphone voice actuated switching system |
| 07/15/1999 | WO1999035351A1 Acoustical diffuser assembly and method of installation |
| 07/13/1999 | US5923002 For diffusing sound in a predetermined manner |
| 07/07/1999 | CN1222050A Audio player |
| 07/01/1999 | WO1999033323A1 Method and apparatus for multi-way conference calling with a full-duplex speakerphone and a digital wireless communication terface |
| 06/17/1999 | WO1999009787A8 A distributed stereo system |
| 06/15/1999 | US5912978 Loudspeaker |
| 06/02/1999 | CN2322349Y Electricity-charging type public-address amplifier for teaching |
| 05/06/1999 | WO1999022549A1 Public addressing system |
| 05/04/1999 | CA2168341C An audio processing system for point-to-point and multipoint teleconferencing |
| 04/29/1999 | DE19746525A1 Audio equipment for motor vehicles |
| 04/28/1999 | CN2316789Y Conical sound wave reflecting body leadspeaker box |
| 04/14/1999 | EP0909112A1 Wireless system with digital transmission for loudspeakers |
| 04/08/1999 | WO1999017585A1 Public alarm apparatus and method for cochlear implants |
| 03/30/1999 | US5889843 Methods and systems for creating a spatial auditory environment in an audio conference system |
| 03/23/1999 | US5886621 Talking poster |
| 02/25/1999 | WO1999009787A1 A distributed stereo system |
| 02/11/1999 | DE19734143A1 Danger warning device for person in inaccessible location |
| 01/27/1999 | CN1041885C Body sense speaker and music reproducing system using the same |
| 01/12/1999 | US5860023 Device for getting sophisticated data and voice information from audience |
| 01/12/1999 | US5859915 Lighted enhanced bullhorn |
| 01/07/1999 | EP0852785A4 Message output controller and system |
| 12/23/1998 | EP0886456A2 Method and apparatus for operating a sound system |
| 12/16/1998 | CN1041266C Public address intelligibility system |
| 12/15/1998 | CA2025002C Automatic mixer apparatus |
| 12/10/1998 | WO1998055709A1 Acoustical room paneling and method of installation |
| 12/02/1998 | EP0881793A2 Video player and display device for use in aircraft entertainment systems |
| 12/02/1998 | EP0719493A4 Apparatus and method for reducing acoustic feedback |
| 12/02/1998 | EP0653144B1 Concert audio system |
| 11/25/1998 | EP0879545A1 Methods and systems for creating a spatial auditory environment in an audio conference system |
| 11/25/1998 | EP0879502A1 A method for implementing a sound reproduction system for a large space, and a sound reproduction system |
| 11/10/1998 | US5835854 Traffic information system comprising a multilingual message generator |
| 11/05/1998 | WO1998049868A1 Light enhanced bullhorn |
| 10/07/1998 | CN2293924Y Portable broadcasting apparatus |
| 10/06/1998 | US5818382 Long range RF tag |
| 09/23/1998 | EP0700622A4 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles |
| 09/22/1998 | US5812674 Method to simulate the acoustical quality of a room and associated audio-digital processor |
| 09/16/1998 | EP0865225A2 Terminal station for a transmission system |
| 09/15/1998 | US5809153 Loudspeaker system |
| 09/02/1998 | EP0861547A1 Information distribution system |
| 09/01/1998 | US5802190 Linear speaker array |
| 08/18/1998 | US5797125 Voice guide system including portable terminal units and control center having write processor |
| 08/13/1998 | WO1998034697A1 Method and apparatus for interactive audience participation by audio command |
| 08/04/1998 | US5790644 Computer-to-telephone interface |
| 07/15/1998 | EP0852785A1 Message output controller and system |
| 06/10/1998 | EP0847225A2 Electroacoustical transducing |
| 06/03/1998 | EP0845766A2 Method of informing passengers in a traffic system and associated information system |
| 06/02/1998 | US5761320 Audio distribution system having programmable zoning features |
| 05/20/1998 | EP0843502A1 Howling detection and prevention circuit and a loudspeaker system employing the same |
| 05/20/1998 | EP0842508A1 Acoustic wave focusing method and device |
| 04/29/1998 | CN1180470A Improvement in or relating to loudspeakers |
| 04/02/1998 | WO1998013942A1 Vehicular loudspeaker system |
| 04/02/1998 | DE19649875A1 Information equipment for passenger transport system |
| 03/31/1998 | US5734964 Mass programmable FM stereo sound equalized assistive listening apparatus |
| 03/31/1998 | US5734320 Emergency warning gear having a multitude of functions |
| 03/26/1998 | WO1998012837A1 Information distribution system |
| 03/17/1998 | US5729613 Reverberators for use in wide band assisted reverberation systems |
| 01/20/1998 | US5710422 Talking poster |
| 01/14/1998 | EP0818122A1 Improvements in or relating to loudspeakers |
| 12/30/1997 | US5703337 In gas exhaust streams |
| 12/29/1997 | EP0781429A4 Micro personal digital assistant |
| 12/17/1997 | CN2271082Y Karaoke horn and loudspeaker box |
| 11/26/1997 | CN2269041Y Electronic fun for games |
| 11/03/1997 | CA2175607A1 Track mounted distributed audio broadcasting system |
| 09/16/1997 | US5668884 Enhanced concert audio system |
| 09/12/1997 | WO1997033450A1 Methods and systems for creating a spatial auditory environment in an audio conference system |
| 09/09/1997 | US5666428 For use in a facility |
| 08/13/1997 | CN2259737Y External portable carry-on amplifier |
| 07/30/1997 | EP0786920A1 Transmission system of correlated signals |
| 07/24/1997 | WO1997026774A1 Sound recording apparatuses and sound recording and reproducing apparatuses |
| 07/15/1997 | US5649019 Digital apparatus for reducing acoustic feedback |
| 07/02/1997 | EP0781429A1 Micro personal digital assistant |
| 06/17/1997 | US5640459 Portable voice amplifier |