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)
12/2000
12/20/2000EP0809906A4 Very low power cordless headset system
12/20/2000CN1277756A Device for separation of signals
12/20/2000CN1277530A Stereo signal processing device
12/19/2000US6163613 Low-distortion loudspeaker
12/19/2000US6163610 Telephonic handset apparatus having an earpiece monitor and reduced inter-user variability
12/14/2000WO2000076267A1 Method and apparatus for canceling noise in a microphone communications path using an electrical equivalence reference signal
12/14/2000WO2000076266A2 Virtual multichannel speaker system
12/14/2000WO2000076195A1 Symmetry based subband acoustic echo cancellation
12/14/2000WO2000076176A2 Loudspeaker volume range control
12/14/2000DE10028557A1 Stereo audio unit for cars, has impulse response derived correction of stereo image
12/13/2000EP1059831A1 Speaker device
12/13/2000EP1059830A2 Electrodynamic loudspeaker with a control device for an active vehicle noiceattenuator
12/13/2000EP0903055A4 Method and apparatus for localization of an acoustic source
12/12/2000US6160894 Speaker apparatus and sound reproduction system employing same
12/12/2000US6160757 Antenna formed of a plurality of acoustic pick-ups
12/07/2000WO2000074350A2 Adaptability to multiple hands-free communication accessories
12/06/2000EP1058480A2 Audio system and head attachment audio unit
12/06/2000EP1057366A1 Microphone apparatus for producing signals for surround reproduction
12/06/2000EP1057365A1 Personal sound masking system
12/06/2000EP1057364A1 Digital and analog directional microphone
12/06/2000EP1057291A1 System and method for factoring a merged wave field into independent components
12/06/2000CN1275875A Acoustic system and head held acoustic apparatus
12/05/2000US6157724 Apparatus having loudspeakers concurrently producing music sound and reflection sound
12/05/2000CA2215592C Stereophonic acoustic echo cancellation using nonlinear transformations
11/2000
11/30/2000WO2000072630A1 Multipurpose loudspeaker apparatus with adjustable mode and effect
11/30/2000WO2000072627A2 Transducer driver
11/30/2000WO2000072567A1 Acoustic echo cancellation
11/30/2000WO2000072565A1 Enhancement of near-end voice signals in an echo suppression system
11/30/2000WO2000072564A2 Echo compensation device
11/30/2000WO2000072556A1 System and method for near-end talker detection by spectrum analysis
11/30/2000WO2000041437A3 Speaker system
11/30/2000DE10024723A1 Loudspeaker has conducting oscillation coil body with gap extending longitudinally so oscillation coil is formed with winding, and coil is attached to coil body by bonding material
11/29/2000EP1055804A1 Active exhaust silencer
11/29/2000EP1055318A2 Method for improving acoustic noise attenuation in hand-free devices
11/29/2000EP1055317A1 Method for improving acoustic noise attenuation in hand-free devices
11/29/2000CN1275044A Loudspeaker
11/29/2000CN1275001A Adaptive filter emitting control in echo suppressor using structure lagging amplitude distribution estimation method
11/28/2000US6154553 Sound bubble structures for sound reproducing arrays
11/23/2000WO2000048427A3 Method and system of compensating for boundary effects on a primary sound source
11/23/2000DE19923170A1 Fully digital sound signal supply to sound transducers e.g. for headsets, supplies transducer from digital-to-analogue converter directly and/or via computer-supported digital sound signal processing unit
11/22/2000EP1053591A1 Device for amplifying signals
11/22/2000EP0812492A4 Dual audio program system
11/22/2000CN1274513A Anti-noise-electret pick-up
11/21/2000US6151402 Vibration transducers
11/16/2000WO2000068936A1 Cancellation of non-stationary interfering signals for speech recognition
11/16/2000WO2000030403A3 Dynamic bass control circuit with variable cut-off frequency
11/15/2000EP1052838A1 Method and device for stereo echo cancelling by filtering in the frequency domain
11/15/2000EP1052831A1 A receiving section of a telephone with suppression of interference upon switching on/off
11/15/2000EP1052619A2 Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis
11/15/2000EP1051879A1 Audio signal processors
11/15/2000EP1051835A1 Generating calibration signals for an adaptive beamformer
11/15/2000EP1051700A1 Multielement ultrasonic contact transducer
11/14/2000US6148088 Speaker system
11/14/2000US6148085 Audio signal output apparatus for simultaneously outputting a plurality of different audio signals contained in multiplexed audio signal via loudspeaker and headphone
11/14/2000US6148080 Mobile telephone with amplified listening
11/12/2000CA2307999A1 Method and device for cancelling stereophonic echo with frequency domain filtering
11/08/2000EP1051058A2 Piezoelectric audio device and method for sound production
11/08/2000EP1050264A1 Implantable acoustic bio-sensing system and method
11/08/2000EP1050191A1 Thin loudspeaker
11/08/2000EP1050189A1 Method and arrangement for voice communications
11/03/2000CA2306196A1 Implantable acoustic biosensing system and method
11/02/2000EP1049353A2 Bass reproduction speaker apparatus
10/2000
10/31/2000US6141597 Audio processor
10/31/2000US6141424 Headphone capable of directly converting digital audio signal into analog audio signal
10/31/2000US6141415 Method and apparatus for detecting speech at a near-end of a communications system, a speaker-phone system, or the like
10/31/2000CA2188533C Industrial headset
10/26/2000WO2000064217A1 Flat surface loudspeaker and method for operating the same
10/26/2000WO2000064216A1 Anti-feedback, full-duplex headset
10/26/2000WO2000028740A3 Improved signal localization arrangement
10/26/2000DE19917584A1 Flat panel loudspeaker operating method
10/24/2000US6137890 Lumped parameter resonator of a piezoelectric speaker
10/24/2000US6137887 Directional microphone system
10/19/2000WO2000062579A1 System and method for dual microphone signal noise reduction using spectral subtraction
10/19/2000WO2000062462A2 Method for switching signal input based on device capability
10/18/2000EP1045614A1 An anti-noise-electret pick-up
10/18/2000EP1044584A1 Mechanical acoustic crossover network and transducer therefor
10/18/2000EP1044583A1 Means for bass enhancement in an audio system
10/17/2000US6134330 Ultra bass
10/12/2000WO2000060901A2 Audio peripheral device comprising usb interface and digital audio mixer
10/12/2000WO2000060841A1 Method and apparatus for space-time echo cancellation
10/11/2000EP1042866A1 Method and system for driving speakers with a 90 degree phase shift
10/11/2000CN1269902A Method and apparatus for measuring signal level and delay at multiple sensors
10/11/2000CN1269688A Automatic sound regulating method
10/10/2000US6131044 Method for increasing the voice recognition rate of a voice recognition calling device
10/10/2000US6130954 High back-emf, high pressure subwoofer having small volume cabinet, low frequency cutoff and pressure resistant surround
10/10/2000US6130949 Method and apparatus for separation of source, program recorded medium therefor, method and apparatus for detection of sound source zone, and program recorded medium therefor
10/05/2000WO2000059264A2 Optical microphone apparatus
10/05/2000DE19923601C1 Echo compensation device for hands-free telephone, uses calibration signal for providing coefficients for echo replicator simulating loudspeaker-room-microphone system
10/04/2000EP1040728A1 Peak to peak signal detector for audio system
10/03/2000US6128395 Loudspeaker system with controlled directional sensitivity
10/03/2000US6127618 Karaoke apparatus improving separation between microphone signal and microphone sound effect signal
09/2000
09/28/2000WO2000057673A1 Band stop filter
09/28/2000WO2000057671A2 Method and device for receiving and treating audiosignals in surroundings affected by noise
09/28/2000WO2000057585A1 Loudspeaker with thermally compensated impedance
09/28/2000DE10008501A1 Audio frequency crossover network for improving sound reproduction, combines high and low pass filters in arrangement capable of passive, active or digital implementation
09/28/2000CA2367579A1 Method and device for recording and processing audio signals in an environment filled with acoustic noise
09/27/2000EP1039778A1 Device for improving the sound reproduction in the range of low frequencies
09/27/2000EP1039736A1 Method and device for adaptive identification and related adaptive echo canceller
09/27/2000EP1038350A1 Apparatus and methods for enhancing electronic audio signals
09/26/2000US6125189 Electroacoustic transducer of digital type
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