Patents for H04R 27 - Public address systems (2,454)
04/2005
04/27/2005CN1610448A Audio frequency broadcasting device with loudspeaker
04/21/2005DE10052896B4 Verfahren zum Konfigurieren einer Beschallungsanlage und konfigurierbare Beschallungsanlage A method for configuring a sound system and configurable sound system
04/07/2005US20050076219 Transmitting device and method
04/07/2005US20050074128 Hearing system
04/05/2005US6876298 Audible warning for vehicle safety systems
03/2005
03/31/2005WO2004082321A3 Multi-channel digital feedback reducer system
03/31/2005DE10340104A1 Verfahren und System zur effizienten Übertragung der Leistung bei der Beschallung von Räumen Method and system for efficient transfer of power at the sound in rooms
03/31/2005DE10339115A1 Vehicle speech processing system has links to navigation, telephone and electronic address book using voice commands to create alarm event stored speech announcements
03/30/2005EP1519618A1 Method and communication equipment with means for audio signals interference suppression
03/24/2005WO2004093488A3 Directional speakers
03/23/2005EP1517464A2 Digital audio distribution system
03/16/2005EP0976200A4 Vehicular loudspeaker system
03/16/2005CN2686267Y Radio microphone language learning machine
03/10/2005WO2005022804A2 Method and system for efficiently transmitting power when acoustically irradiating rooms
03/09/2005CN2684505Y 数字混音器 Digital Mixer
03/09/2005CN1592492A Stereophony amplifying and playing (replaying) system
03/09/2005CN1591572A Voice matching system for audio transducers
03/03/2005US20050047614 System and method for generating sound transitions in a surround environment
03/03/2005US20050047610 Voice matching system for audio transducers
03/02/2005EP1511351A2 System and method for generating sound transitions in a surround environment
03/02/2005EP1511350A2 Voice matching system for audio transducers
02/2005
02/10/2005US20050032500 Wireless/IR headphones with integrated rear seat audio control for automotive entertainment system
02/10/2005US20050031151 Speaker with adjustable voice coil impedance
02/10/2005US20050031135 Statistical analysis of potential audio system configurations
02/10/2005DE10330808A1 Konferenzeinrichtung und Verfahren zur Mehrpunktkommunikation Conference facilities and methods for multi-point communication
02/09/2005EP1504367A2 Audio network distribution system
02/09/2005CN1578542A Conference device and method for multi-point communication
02/03/2005WO2005011327A1 Howling margin measuring device
02/03/2005US20050026538 Interactive sports audio toy
02/02/2005EP1244278B1 Portable telephone attachment for person hard of hearing
02/02/2005CN1575037A Loudspeaker assembly
01/2005
01/27/2005US20050018857 Wired, wireless, infrared, and powerline audio entertainment systems
01/27/2005US20050018836 Method to reduce acoustic coupling in audio conferencing systems
01/27/2005US20050018039 Conference device and method for multi-point communication
01/26/2005EP1501332A2 A method to reduce acoustic coupling in audio conferencing systems
01/26/2005EP1500303A2 Audio distribution
01/20/2005WO2005006807A1 Transmitter of wireless microphone, receiver for wireless microphone, mobile information communication apparatus, and communication system for wireless microphone
01/20/2005WO2005006806A1 Wireless microphone communication system
01/20/2005US20050013453 Flat panel loudspeaker system for mobile platform
01/13/2005US20050009583 Directional wireless communication systems
01/13/2005US20050008169 Arrangement and method for audio source tracking
01/13/2005US20050008164 Level meter displaying method and level meter apparatus
01/12/2005EP1496680A1 Conference system and method applying HRTF-filter
01/12/2005EP1123637B1 Public address apparatus
01/12/2005CN1564634A 3D8-C stereo audio amplifier system
01/12/2005CN1564633A 3D8-E stereo audio amplifier system
01/12/2005CN1564632A 3D8-B stereo audio amplifier system
01/12/2005CN1564631A 3D8-D stereo audio amplifier system
01/06/2005WO2005002199A2 System and method for delivering audio-visual content along a customer waiting line
01/06/2005CA2528588A1 System and method for delivering audio-visual content along a customer waiting line
01/05/2005CN2669541Y Megaphonefor MP3 layer
01/05/2005CN1561144A 3D8-X stero amplifying system
01/05/2005CN1561142A 3D8-A stereo amplifying system
12/2004
12/30/2004US20040264717 Audio reproduction apparatus
12/29/2004WO2004114719A1 Distributed stereo amplifier
12/29/2004WO2004114660A1 Video visitation station
12/29/2004CN2667839Y Portable electric torch megaphone
12/16/2004US20040252184 Video visitation station
12/08/2004EP1484944A2 Method for reproducing an audio signal with an ultrasonic loudspeaker
12/08/2004CN2662582Y 一种扩音器 One kind of megaphone
12/02/2004WO2004105433A1 Clear sound side fill center fill
12/02/2004US20040240679 Public address system and method for an urban transit vehicle
12/01/2004CN2660832Y Portable underwater playback appliances
11/2004
11/30/2004US6826283 Method and system for allowing multiple nodes in a small environment to play audio signals independent of other nodes
11/25/2004US20040234088 Wired, wireless, infrared, and powerline audio entertainment systems
11/18/2004WO2004100546A1 An arrangement and method for audio source tracking
11/18/2004US20040230433 Microphone system
11/10/2004EP1475992A2 Electroacoustical transducing
11/10/2004CN2655580Y Multifunctional digital controlled conference audio amplifier
11/04/2004WO2004095877A2 Fastener and nut with axially interrupted threads
11/04/2004US20040220687 Device and method for transmitting, receiving and processing audio control signals in information systems
11/04/2004US20040218773 Loudspeaker array
11/03/2004EP1238566B1 Method and device for improving communication in a vehicle
11/02/2004US6813360 Audio conferencing with three-dimensional audio encoding
10/2004
10/28/2004WO2004093488A2 Directional speakers
10/28/2004US20040213422 Pollable transformer isolated speaker system and method
10/28/2004DE202004012219U1 Speech conference system has basic conference block with multiple digital signal ports for connection to terminals or further basic blocks
10/26/2004US6810127 Clear sound side fill center fill
10/21/2004US20040209654 Directional speaker for portable electronic device
10/21/2004US20040208333 Directional hearing enhancement systems
10/21/2004US20040208325 Method and apparatus for wireless audio delivery
10/21/2004US20040208324 Method and apparatus for localized delivery of audio sound for enhanced privacy
10/06/2004EP1464205A2 Device and method for transmitting, receiving and processing audio control signals in information systems
09/2004
09/30/2004WO2004084177A2 Audible warning for vehicule safety systems
09/29/2004EP1196907B1 Audio signal sound diffusion system
09/29/2004CN1533217A Digita mixer
09/23/2004WO2004082321A2 Multi-channel digital feedback reducer system
09/23/2004US20040184626 Digital mixer
09/22/2004EP1460880A2 Loudspeaker array
09/22/2004EP1460786A2 Digital mixer
09/22/2004CN1531836A Supplemental audio contents system with wireless communication for cinema and related methods
09/16/2004US20040179387 Multi-channel digital feedback reducer system
09/16/2004US20040178893 Audible warning for vehicle safety systems
09/15/2004EP1457091A2 Method and system for selectively broadcasting data in a space, and equipment used in said system
09/15/2004EP1175812B1 Method for the reproduction of sound waves using ultrasound loudspeakers
09/07/2004US6788983 Audio trigger devices
09/02/2004US20040170284 Sound reinforcement system having an echo suppressor and loudspeaker beamformer
08/2004
08/26/2004US20040165732 Speaker system and method for selectively activating speakers
08/25/2004CN2636567Y Embedded sound amplifying device
08/17/2004US6778966 Segmented mapping converter system and method
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