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)
12/2005
12/08/2005WO2005117484A1 Speaker system, and speaker cluster system
12/08/2005DE102004021546A1 Electroacoustic transducer for loudspeaker with horn incorporates amplifier with negative output impedance and has power amplifier with negative feedback via resistor
12/08/2005CA2568189A1 Speaker system
12/06/2005US6973184 System and method for stereo conferencing over low-bandwidth links
12/01/2005US20050265560 Indoor communication system for a vehicular cabin
11/2005
11/30/2005EP1600041A1 Audio distribution system
11/30/2005CN2744113Y Operating panel structure for hybrid system and mixing system, and controlling apparatus for mixing system
11/24/2005WO2005101176A3 Intuitive user interface and method
11/24/2005DE10362073A1 Vorrichtung und Verfahren zum Verarbeiten eines Eingangssignals Apparatus and method for processing an input signal
11/22/2005US6967541 Digital pulse-width-modulation generator
11/17/2005WO2005109951A1 Angular discrimination of acoustical or radio signals
11/17/2005US20050254640 Sound pickup apparatus and echo cancellation processing method
11/16/2005EP1596634A2 Sound pickup apparatus and echo cancellation processing method
11/16/2005EP0719493B1 Apparatus and method for reducing acoustic feedback
11/10/2005US20050249361 Selective shaping of communication signals
11/09/2005CN2739904Y Wireless megaphone
11/03/2005WO2005104610A1 Resonance frequency determining method, resonance frequency selecting method, and resonance frequency determining apparatus
11/03/2005US20050246041 Audio related system communication protocol
11/02/2005EP1591995A1 Indoor communication system for a vehicular cabin
10/2005
10/27/2005WO2005101176A2 Intuitive user interface and method
10/27/2005WO2004095877A3 Fastener and nut with axially interrupted threads
10/27/2005US20050239397 System for audio related equipment management
10/27/2005US20050239396 System for audio-related device communication
10/20/2005US20050232602 Audio related system link management
10/20/2005US20050232445 Use of voice-to-remaining audio (VRA) in consumer applications
10/20/2005DE202005007262U1 Conference speech point, has acoustic conductor provided in part of housing surface
10/19/2005EP1587230A2 System and method for management and control of audio-related equipment
10/19/2005EP1587229A2 System for node structure determination in an audio-related system
10/19/2005EP1587228A2 Communication protocol for audio system
10/13/2005US20050226595 Audio-related system node instantiation
10/13/2005US20050226440 P.A. system installation method
10/13/2005US20050226438 Parametric ring emitter
10/13/2005US20050226430 System for node structure discovery in an audio-related system
10/12/2005EP1585241A2 System for audio related equipment management
10/12/2005EP1585240A2 System and method for communication among audio-related device
10/12/2005CN1682566A Calibrating a first and a second microphone
10/06/2005WO2005094117A1 Integrated electro acoustic equipment with portable compact construction for sound applications
10/06/2005US20050219228 Intuitive user interface and method
09/2005
09/29/2005US20050216263 Methods and systems for intelligibility measurement of audio announcement systems
09/29/2005US20050213528 Audio distributon
09/28/2005EP1581024A1 Integrated electro acoustic equipment with portable compact construction for sound applications
09/28/2005EP1580910A2 Audio-related system node instantiation
09/28/2005CN2730067Y Audio power amplifier with radio intercom
09/22/2005US20050207595 Microphone apparatus built in computer network
09/22/2005US20050207591 Audio input unit, audio input method and audio input and output unit
09/22/2005US20050207590 Method of reproducing audio sound with ultrasonic loudspeakers
09/21/2005CN2728151Y Built-in microphone apparatus for FM broadcasting loud-speaker
09/20/2005US6947566 Method and apparatus for a portable public address system
09/14/2005EP1238498B1 Localised audio data delivery
09/07/2005CN2724344Y Multifunction loudspeaker for automobile
08/2005
08/31/2005CN2722544Y Wireless amplification director
08/31/2005CN2722384Y DVD player on desk with built-in loudspeakers
08/25/2005WO2005076912A2 An addressable loudspeaker
08/25/2005US20050184137 Bullhorn cup
08/18/2005WO2005076663A1 Audio system having reverberation reducing filter
08/17/2005CN1215717C Audio-frequency input device, input method thereof, and audio-frequency input-output device
08/16/2005US6931136 Infrared emitter
08/11/2005US20050177256 Addressable loudspeaker
08/11/2005DE10330808B4 Konferenzeinrichtung und Verfahren zur Mehrpunktkommunikation Conference facilities and methods for multi-point communication
08/03/2005EP1559257A2 Method and device for the synchronised restitution of data flows
08/03/2005EP1559225A1 Mechanism and method for audio system synchronization
08/03/2005CN1213556C Cinema system for treating audio signal in consumer applications and relative method
07/2005
07/28/2005WO2005069685A1 Intelligibility testing for monitoring or public address systems
07/28/2005WO2005069684A1 Bullhorn cup
07/27/2005CN1647581A Audio distribution
07/21/2005WO2004084177A3 Audible warning for vehicule safety systems
07/13/2005CN1638532A Audio-frequency input device, input method thereof, and audio-frequency input-output device
07/06/2005EP0861547B1 Information distribution system
07/05/2005US6914996 Portable telephone attachment for person hard of hearing
06/2005
06/28/2005US6912501 Use of voice-to-remaining audio (VRA) in consumer applications
06/23/2005US20050135637 Intelligibility measurement of audio announcement systems
06/22/2005CN1630433A Portable underwater playback device
06/22/2005CN1630430A An underwater loudspeaker
06/22/2005CN1630429A An underwater playback device
06/16/2005WO2005022804A3 Method and system for efficiently transmitting power when acoustically irradiating rooms
06/16/2005US20050131558 Audio network distribution system
06/16/2005US20050129254 Location aware directed audio
06/15/2005EP1540987A1 P.a. system installation method
06/15/2005EP1540986A1 Calibrating a first and a second microphone
06/09/2005DE10351793A1 Vorrichtung und Verfahren zum Verarbeiten eines Eingangssignals Apparatus and method for processing an input signal
06/08/2005EP1538876A2 Equipment for collection and measurement of quadraphonic sound data and metadata as well as a corresponding recording procedure
06/07/2005US6903474 Electro-mechanical transducer
06/02/2005WO2005050953A2 Automatic audio systems for fire detection and diagnosis, and crew and person locating during fires
06/02/2005WO2005050088A1 Public address system for lampposts or similar vertical supports
05/2005
05/26/2005WO2005048650A1 Signal receiving apparatus and method
05/26/2005WO2005002199A3 System and method for delivering audio-visual content along a customer waiting line
05/26/2005US20050111671 Wireless digital transmission system for loudspeakers
05/25/2005CN2702570Y Multifunctional bright light megaphone
05/25/2005CN2702540Y A multimedia device for mobile phone
05/19/2005WO2005046194A1 Device and method for processing an input signal
05/19/2005US20050105743 Automatic audio systems for fire detection and diagnosis, and crew and person locating during fires
05/06/2005WO2005041615A1 Method and communication device with means for interference suppression in audio signals
05/06/2005WO2005041447A1 Multiple channel wireless communication system
05/06/2005CA2542735A1 Multiple channel wireless communication system
05/05/2005US20050094825 Remotely controlled sound generator
05/05/2005US20050094819 Infrared emitter
05/05/2005US20050094664 System for the radio transmission of real-time airline flight information
05/04/2005CN2697997Y Sound mixer with improved sound adjusting device distribution
05/04/2005CN1612869A Novel 1, 2, 4-thiadiazolium derivatives as melanocortin receptor modulators
04/2005
04/27/2005CN2696254Y Multifunctional broadcast audio power amplifier
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