Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 3 - Circuits for transducers
Patents for H04R 3 - Circuits for transducers (18,190)
06/1999
06/02/1999CN1218361A Adaptive controller for actuator systems
06/01/1999US5909499 Speaker with magnetic structure for damping coil displacement
06/01/1999US5909496 Speaker apparatus
06/01/1999US5909489 Method of and circuit arrangement for improving the transmission properties of an echo affected transmission link in a telecommunications network
05/1999
05/27/1999WO1999026454A1 Low-frequency audio simulation system
05/27/1999DE19740601C1 Signal distortion correction device for wideband transmission system
05/26/1999EP0788722B1 Apparatus and method of enhancing audio signals
05/26/1999CN2321189Y Amplifying circuit controller of speaker
05/26/1999CN2321188Y Speaker with Karaoke function
05/26/1999CN1217864A High-fidelity and high-efficiency analog amplifier combined with digital amplifier
05/20/1999WO1999025151A1 Audio system comprising audio signal processing circuit
05/20/1999WO1999025150A1 Audio system comprising audio signal processing circuit
05/20/1999WO1999016170A3 Device for separation of signals
05/20/1999DE19746645C1 Adaptiver akustischer Monitor Adaptive acoustic monitor
05/19/1999EP0917396A2 Method and arrangement for attenuating mechanical resonance in a loudspeaker
05/19/1999EP0917395A2 Audio system
05/19/1999EP0917046A2 Audio system utilizing personal computer
05/19/1999CN2319986Y Low distortion loudspeaker vibration negative feedback system assembly
05/18/1999US5905802 Dual action automatic sound level control
05/06/1999WO1999022366A2 Improved audio reproduction arrangement and telephone terminal
05/06/1999EP0913929A2 Audio output amplifier with parallel class AB stages
05/05/1999CN1043287C Protection arrangement for audio output channel
05/04/1999US5901230 Hands-free communication method for a multichannel transmission system
05/04/1999CA2021244C Noise reducing device
04/1999
04/29/1999WO1999021400A1 Hearing aid comprising an array of microphones
04/29/1999WO1999021396A1 Howling eliminator
04/29/1999WO1999021395A1 Adaptive acoustic monitor
04/28/1999CN1215540A Acoustic feedback correction
04/28/1999CN1215299A Portable microphone for realizing image-word output function and its method
04/28/1999CN1215296A Mobile telephone set with amplified listening
04/28/1999CN1214901A Ultrasonic image coherent filtering method and device
04/27/1999US5897569 Ultrasonic generator with supervisory control circuitry
04/22/1999DE19745949A1 Arrangement for limiting loudness in a room, e.g. for use at concerts
04/21/1999CN1043110C Apparatus for virtual expansion of power supply capacity
04/14/1999EP0909114A2 Method and apparatus for indicating speaker faults
04/14/1999EP0909077A2 Method and arrangement for improving leak tolerance of an earpiece in a radio device
04/14/1999EP0908019A1 Acoustic heterodyne device and method
04/13/1999US5894513 Hands-free communication unit having residual acoustic echo suppression means for suppressing residual echoes which have been left unremoved by an echo canceller, a bilateral communication system and a method for suppressing residual echoes
04/07/1999EP0907122A1 Power adapter having a speaker for an electronic device
04/06/1999US5892833 Gain and equalization system and method
04/06/1999CA2247694A1 Audio output amplifier with parallel class ab stages
04/06/1999CA2149687C Long-time balancing of omni microphones
04/01/1999WO1999016286A1 Car radio system
04/01/1999WO1999016285A1 Process and electric appliance for optimising acoustic signal reception
04/01/1999WO1999016170A2 Device for separation of signals
03/1999
03/31/1999EP0905999A2 Motor vehicle communication system
03/31/1999CN1212555A Direction transform echo canceller and method
03/30/1999US5889870 Acoustic heterodyne device and method
03/25/1999WO1999014984A1 Improved directional microphone audio system
03/25/1999WO1999014982A1 Headphone with a switching-off device
03/25/1999WO1998046043A3 Sound pickup device, specially for a voice station
03/25/1999DE19842191A1 Medical ultrasound device for imaging structures
03/25/1999DE19742087A1 Car radio system, esp. with at least two loudspeakers
03/25/1999DE19741596A1 Optimum directional reception of acoustic signals for speech recognition
03/24/1999EP0903961A2 Inductive braking in a dual coil speaker driver unit
03/24/1999EP0903960A1 Antenna formed by a plurality of acoustic detectors
03/24/1999EP0903909A1 Loudspeaking mobile telephone
03/24/1999EP0903726A2 Active acoustic noise and echo cancellation system
03/24/1999EP0903058A1 Electroacoustic transducer
03/24/1999EP0903056A1 Superdirective microphone arrays
03/24/1999EP0903055A1 Method and apparatus for localization of an acoustic source
03/23/1999US5887066 Headphone apparatus
03/23/1999US5886656 Digital microphone device
03/23/1999CA2149686C Directional microphone system
03/18/1999WO1999013683A1 Method and device for reproducing a stereophonic audiosignal
03/18/1999WO1999013589A1 Audio processor
03/17/1999EP0901726A2 Microphone noise rejection system
03/17/1999EP0627139B1 Feedback level estimator between loudspeaker and microphone
03/17/1999CN1211379A Method for producing ball sounds during a sporting event, and ball therefor
03/17/1999CN1211155A Electro-mechanical-acoustic transducing device
03/11/1999WO1999012386A1 5-2-5 matrix encoder and decoder system
03/11/1999WO1998058522A3 Sound reproduction system
03/11/1999DE19839250A1 Audio signal output apparatus for simultaneous output to loudspeaker and headphones
03/11/1999DE19739425A1 Verfahren und Anordnung zur Wiedergabe eines sterophonen Audiosignals Method and apparatus for reproducing an audio signal sterophonen
03/11/1999CA2242510A1 Coupled acoustic echo cancellation system
03/10/1999EP0901267A2 The detection of the speech activity of a source
03/10/1999EP0706732A4 Short range inductively coupled communication system employing time variant modulation
03/09/1999US5881157 Apparatus for compensating a frequency characteristic of a reproduction audio signal
03/04/1999WO1999011045A1 Telephone handset noise suppression
03/03/1999EP0898816A2 Echo suppressor and non-linear processor of echo canceller
03/03/1999EP0847666B1 Panel-form loudspeakers
03/03/1999CN2309678Y Sound signal output device
02/1999
02/25/1999WO1999009787A1 A distributed stereo system
02/25/1999WO1999009786A1 A method for electronically beam forming acoustical signals and acoustical sensor apparatus
02/25/1999DE19826855A1 Tone generator system, e.g. loudspeaker, in portable casing
02/24/1999EP0898441A2 Method for inputting acoustic signals into an electric apparatus ans electric apparatus
02/24/1999EP0898364A2 Compensating filters
02/18/1999WO1999008479A1 Sound radiating devices/systems
02/18/1999CA2295724A1 Sound radiating devices/systems
02/17/1999EP0847567B1 A vending machine
02/17/1999EP0791279B1 Loudspeaker system with controlled directional sensitivity
02/16/1999CA2066624C Method and apparatus for adaptive audio resonant frequency filtering
02/10/1999CN2307417Y Electric accordatura device
02/09/1999US5869892 Noise eliminating element and electrical circuit having the same
02/02/1999US5867573 Telephone handset interface with feedback control
02/02/1999US5867223 System for assigning multichannel audio signals to independent wireless audio output devices
01/1999
01/28/1999WO1999004598A1 Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus
01/21/1999WO1999003303A1 Method and apparatus for formatting the digital audio signal for use of the sound reproduction
01/21/1999WO1999003199A1 Voice signal processor
01/21/1999WO1999003093A1 Combined speech coder and echo canceler
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