| Patents for H04R 27 - Public address systems (2,454) |
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| 03/06/2002 | EP1185138A2 System for delivering audio content |
| 02/28/2002 | CA2350247A1 System for delivering synchronized audio content to viewers of movies |
| 02/12/2002 | US6347148 Method and apparatus for feedback reduction in acoustic systems, particularly in hearing aids |
| 02/07/2002 | US20020016165 Localised audio data delivery |
| 01/31/2002 | US20020013698 Use of voice-to-remaining audio (VRA) in consumer applications |
| 01/30/2002 | EP1175812A1 Method for the reproduction of sound waves using ultrasound loudspeakers |
| 01/24/2002 | WO2001039370A3 Signal processing system and method |
| 01/23/2002 | CN2473843Y Fully automatic overlapping loudspeaker system for teaching |
| 01/03/2002 | WO2002001812A2 Localised audio data delivery |
| 01/03/2002 | WO2001043490A3 Speech distribution system |
| 01/02/2002 | EP1168885A2 Speaker system comprising a means for selecting a specific speaker in order to transmit an audible message to a specific location |
| 12/23/2001 | CA2345187A1 Addressable speaker system |
| 12/20/2001 | WO2001041499A3 Method and device for improving communication in a vehicle |
| 12/19/2001 | EP1163824A1 Intelligent speaker training using microphone feedback and pre-loaded templates |
| 12/19/2001 | EP0818122B1 Improvements in or relating to loudspeakers |
| 12/11/2001 | US6329908 Addressable speaker system |
| 11/29/2001 | WO2001091314A2 Method and means for receiving a digital transmission comprising a plurality of digital audio signals and for simultaneous reproduction of these signals as analog audio programmes |
| 11/28/2001 | CN2462619Y intelligent protecting audio amplifier |
| 11/22/2001 | US20010043652 Digital pulse-width-modulation generator |
| 11/20/2001 | US6321278 Automatically detecting a connection into a computer system standardized connector for disabling a front speaker |
| 11/07/2001 | EP1151629A1 Diffuser panel with built-in speaker arrangement and methods of installation |
| 10/30/2001 | US6311155 Use of voice-to-remaining audio (VRA) in consumer applications |
| 10/17/2001 | EP0746959A4 Digitally controlled analog cancellation system |
| 10/04/2001 | US20010026623 Remote Broadcasting System |
| 10/04/2001 | EP1138129A1 A method for use in a teleloop system, a teleloop system and an amplifier for a teleloop system |
| 08/30/2001 | WO2001063757A2 Portable equalizer with frequencies adjustable according to the user's hearing capacity |
| 08/28/2001 | US6282297 Angle adjustment structure for speaker system |
| 08/23/2001 | WO2001062044A1 Method and device for comparing signals to control transducers and transducer control system |
| 08/16/2001 | EP1123637A2 Public address apparatus |
| 08/15/2001 | CN2443572Y Handy-to-regulate starter for audio frequency device |
| 08/14/2001 | US6275580 Teleconferencing device having acoustic transducers positioned to improve acoustic echo return loss |
| 08/09/2001 | WO2001058064A1 Use of voice-to-remaining audio (vra) in consumer applications |
| 08/09/2001 | CA2399495A1 Use of voice-to-remaining audio (vra) in consumer applications |
| 08/08/2001 | EP1122973A2 Digital pulse-width-modulation generator |
| 08/02/2001 | WO2001055833A1 Spatialized audio system for use in a geographical environment |
| 07/25/2001 | CN1305661A User adjustable volume control that accommodates hearing |
| 07/12/2001 | WO2001050817A1 Accumulator-powered mobile amplified enclosures |
| 07/05/2001 | DE19938171C2 Verfahren zur Verarbeitung von akustischen Signalen und Kommunikationsanlage für Insassen in einem Fahrzeug A method of processing acoustic signals, and communication system for occupant in a vehicle |
| 07/03/2001 | US6256394 Transmission system for correlated signals |
| 06/27/2001 | EP1110425A1 Acoustical speaker housing and methods of installation |
| 06/26/2001 | US6252969 Howling detection and prevention circuit and a loudspeaker system employing the same |
| 06/14/2001 | WO2001043490A2 Speech distribution system |
| 06/07/2001 | WO2001041499A2 Method and device for improving communication in a vehicle |
| 06/07/2001 | CA2391797A1 Method and device for improving communication in a vehicle |
| 05/31/2001 | WO2001039370A2 Signal processing system and method |
| 05/31/2001 | DE19958836A1 In car communication system has individual microphones and loudspeakers allows easy conversation |
| 05/24/2001 | US20010001603 Process and device for focusing acoustic waves |
| 05/23/2001 | DE19953003A1 Equipment controlling device, for PA system and lighting at public events, uses an operational area with a stage and a public area separated from each other at an interface fitted with loudspeakers. |
| 03/06/2001 | US6198829 Process and device for focusing acoustic waves |
| 03/01/2001 | DE19938171A1 Acoustic signal processing method for passenger vehicle communications installation processes acoustic signals in dependence on respective seating position for providing respective acoustic zones |
| 02/21/2001 | EP1076928A1 User adjustable volume control that accommodates hearing |
| 02/20/2001 | US6192135 Dearticulator |
| 02/01/2001 | WO2001008449A1 Method for the reproduction of sound waves using ultrasound loudspeakers |
| 01/25/2001 | WO2001006475A1 Audio signal sound diffusion system |
| 01/16/2001 | CA2170026C Digitally controlled analog cancellation system |
| 01/04/2001 | DE19930638A1 Acoustic reproduction of information in vehicle involves outputting information at least over first loudspeaker and spatially separate second loudspeaker or number of two or more loudspeaker |
| 01/03/2001 | CN2412631Y Portable toy with loud-speaker |
| 12/21/2000 | WO2000078092A1 Loudspeaker |
| 12/20/2000 | EP1060592A1 Teleconferencing method and apparatus with three-dimensional sound positioning |
| 12/14/2000 | CA2275040A1 Exterior audio receiver system |
| 11/29/2000 | CN2408638Y PT type megaphone |
| 11/29/2000 | CN2408637Y Magaphone with solified voice sheet |
| 11/22/2000 | CN1274254A 3D-space sound system |
| 11/14/2000 | US6148003 Information distribution system |
| 11/14/2000 | US6147593 Message output controller and system |
| 11/02/2000 | EP0728403B1 Voice transmission adaptor assembly |
| 10/18/2000 | CN2401936Y Computerised sound card plug-in type recording/playing audio power amplifier |
| 09/26/2000 | US6125188 Compact personal monitor system |
| 09/26/2000 | US6125115 Teleconferencing method and apparatus with three-dimensional sound positioning |
| 09/21/2000 | WO2000056119A1 Intelligent speaker training using microphone feedback and pre-loaded templates |
| 09/20/2000 | EP1037501A1 Public addressing system |
| 09/19/2000 | US6122620 System for the radio transmission of real-time airline flight information |
| 08/23/2000 | CN2393290Y Transistor broadcaster |
| 08/16/2000 | CN2392331Y Additional device for expanded function for medium wave radio |
| 08/10/2000 | DE19904999A1 Arrangement for influencing at least one note, determines positional viewpoint(s) in room with at least two receptors, each with controller for sounds or music independent of the other |
| 08/08/2000 | US6098743 Acoustical speaker housing and method of installation |
| 08/02/2000 | CN2390366Y Portable radio acoustic device |
| 07/18/2000 | US6091826 Method for implementing a sound reproduction system for a large space, and a sound reproduction system |
| 06/21/2000 | EP1009502A1 Method and apparatus for interactive audience participation by audio command |
| 06/08/2000 | WO2000018188A3 Public address apparatus |
| 06/06/2000 | US6072879 Sound field control unit and sound field control device |
| 06/02/2000 | WO2000031891A1 A method for use in a teleloop system, a teleloop system and an amplifier for a teleloop system |
| 05/31/2000 | EP1004222A1 A distributed stereo system |
| 05/31/2000 | CN1255004A Intelligent audio amplifier system for meeting |
| 05/30/2000 | US6069844 Acoustic annunciator for audio tracking collars |
| 05/30/2000 | CA2120019C Sound acquisition method and system, and sound acquisition and reproduction apparatus |
| 05/24/2000 | CN2379986Y Remote control voic box/power amplifier selector |
| 05/10/2000 | CN2377791Y Three-in-one noiseproof sound concentrator for radio |
| 04/27/2000 | DE19846821A1 Audiokommunikationssystem Audio communication system |
| 04/25/2000 | CA2011674C Electro-acoustic system |
| 04/18/2000 | US6052471 Smart audio receiver that automatically select an input audio source |
| 04/12/2000 | EP0993229A2 Audio communication system |
| 04/05/2000 | CN2372859Y Electronic heightened device for table tennis |
| 03/30/2000 | WO2000018188A2 Public address apparatus |
| 03/16/2000 | WO2000014999A1 Acoustical speaker housing and methods of installation |
| 03/16/2000 | WO2000014996A1 Diffuser panel with built-in speaker arrangement and methods of installation |
| 03/16/2000 | CA2340390A1 Diffuser panel with built-in speaker arrangement and methods of installation |
| 03/16/2000 | CA2340249A1 Acoustical speaker housing and methods of installation |
| 03/15/2000 | EP0698326B1 Computer-to-telephone interface |
| 03/02/2000 | WO2000011911A1 Parametric ring emitter |