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)
01/1999
01/21/1999WO1999003091A1 Methods and apparatus for measuring signal level and delay at multiple sensors
01/21/1999CA2297655A1 Combined speech coder and echo canceler
01/21/1999CA2295869A1 Method and apparatus for formatting the digital audio signal for use of the sound reproduction
01/19/1999US5862237 Speaker apparatus
01/13/1999EP0891117A2 Loudspeaker and sound reproduction system employing such a loudspeaker
01/13/1999EP0890291A1 Process and arrangement for converting an acoustic signal to an electrical signal
01/13/1999EP0890232A1 Computer controlled home entertainment system
01/12/1999CA2143227C Noise-canceling differential microphone assembly
01/07/1999WO1998039863A3 Audio crossover circuit
01/07/1999DE19727674A1 Sound system switching device, esp. for car stereo equipment
01/06/1999CN2303418Y Low distortion and low noise mouth-piece
01/05/1999US5857167 Combined speech coder and echo canceler
01/05/1999US5857019 Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
01/05/1999US5856759 Audio output amplifier with parallel class AB stages
12/1998
12/30/1998WO1998059531A1 Device for protecting an electric circuit against interface micro-discharges
12/30/1998EP0888032A1 Electro-mechanical-acoustic transducing arrangement
12/30/1998EP0886990A1 Process and device for transmitting sound
12/23/1998WO1998058522A2 Sound reproduction system
12/23/1998EP0886456A2 Method and apparatus for operating a sound system
12/22/1998CA2138698C Telephone set with background noise suppression function
12/17/1998DE19724673A1 Method and circuit arrangement for noise reduction in electroacoustics transducers e.g. for transmission of audio signals
12/16/1998EP0884926A1 Method and device for optimized processing of an interfering signal when recording sound
12/16/1998EP0884886A2 Echo canceler employing multiple step gains
12/16/1998EP0883972A1 Acoustic element and method for sound processing
12/16/1998CN2301028Y Small power speaker device with echo generator
12/16/1998CN1202064A Voice recognition rate increasing method in call initation of voice recognition calling device
12/16/1998CN1202051A Echo canceler employing multiple step gains
12/15/1998CA2025002C Automatic mixer apparatus
12/10/1998WO1998056210A1 Continuous frequency dynamic range audio compressor
12/10/1998WO1998056208A2 Cabin communication system
12/10/1998CA2290486A1 Cabin communication system
12/09/1998EP0883326A2 Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer
12/09/1998EP0883325A2 Multi-strategy array processor
12/08/1998US5848170 Acoustic antenna for computer workstation
12/08/1998US5847610 Protection circuit for an audio amplifier
12/02/1998EP0880869A1 Portable speakers with phased arrays
12/02/1998EP0880499A1 Distamycin derivatives, process for preparing them, and their use as antitumor and antiviral agents
12/02/1998EP0719493A4 Apparatus and method for reducing acoustic feedback
12/02/1998CN1041042C Noise cancellation apparatus, and telephone set having same
12/01/1998US5844997 Method and apparatus for locating the origin of intrathoracic sounds
11/1998
11/26/1998WO1998053639A1 Electric or electronic circuit element free from microdischarge
11/26/1998WO1998053595A1 Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions
11/25/1998EP0880260A2 Echo/noise canceler with delay compensation
11/24/1998US5841308 Amplifier for cancelling noise between circuit systems
11/17/1998US5838804 Apparatus and method for providing proper microphone DC bias current and load resistance for a telephone
11/17/1998US5838384 System for assigning multichannel audio signals to independent wireless audio output devices
11/11/1998EP0779014B1 Device for controlling the volume of a car radio dependently upon the ambient noise
11/11/1998CN1198620A Echo/noise eliminator with delay compensation
11/10/1998US5835608 Signal separating system
11/10/1998US5835607 Mobile radiotelephone with handsfree device
11/04/1998EP0781446B1 Directional ear device with adaptive bandwidth and gain control
11/04/1998CN1198283A Arrangement for suppressing interfering component of input signal
11/04/1998CN1040590C Sound synthesizer
11/03/1998US5832096 Speaker containing dual coil
10/1998
10/29/1998WO1998048406A1 Method for the optimal transmission of communication having any physical characteristics, method for optimal sound reproduction and system for realising the same, and method for the active, three-dimensional and optimal level reduction of signals having any physical characteristics
10/28/1998EP0874514A2 Method and apparatus for cancelling multi-channel echo
10/28/1998EP0874468A2 Broadcast receiver
10/28/1998EP0873606A1 Systems for feedback cancellation in an audio interface garment
10/27/1998US5828768 Multimedia personal computer with active noise reduction and piezo speakers
10/27/1998US5828767 Inductive braking in a dual coil speaker driver unit
10/27/1998US5828763 For reproducing an audio signal
10/27/1998US5828756 Stereophonic acoustic echo cancellation using non-linear transformations
10/27/1998US5828755 Method and device for processing signals
10/22/1998WO1998047276A1 Method for cancelling multichannel acoustic echo and multichannel acoustic echo canceller
10/21/1998EP0872155A1 Portable speakers with enhanced low frequency response
10/21/1998CN1196652A Earphone
10/20/1998US5825897 Noise cancellation apparatus
10/15/1998WO1998046044A1 Apparatus and method for bass enhancement
10/15/1998WO1998046043A2 Sound pickup device, specially for a voice station
10/14/1998EP0870369A1 Enhanced concert audio process utilizing a synchronized headgear system
10/14/1998EP0870298A2 Noise cancellation and noise reduction apparatus
10/13/1998US5822441 Power amplifier/loudspeaker interface
10/13/1998US5822440 Enhanced concert audio process utilizing a synchronized headgear system
10/13/1998CA2145699C Voice actuated switching system
10/07/1998EP0869697A2 A steerable and variable first-order differential microphone array
10/07/1998EP0869696A1 Stereo/telephone change-over transmitter/receiver
10/07/1998CN1195459A Panel-form loudspeakers
10/07/1998CN1195454A Acoustic device
10/06/1998US5818949 Microphone with infared on/off switch
10/06/1998US5818948 Architecture for a universal serial bus-based PC speaker controller
09/1998
09/30/1998EP0824845B1 Process for controlling a programmable or program-controlled hearing aid for its in-situ fitting adjustment
09/30/1998CN1194567A Multipurpose studying system and its operating method
09/29/1998US5815589 Push-pull transmission line loudspeaker
09/29/1998US5815585 For converting an electric signal into a mechanic or an acoustic signals
09/29/1998US5815580 Compensating filters
09/29/1998US5815579 Portable speakers with phased arrays
09/29/1998US5815578 Method and apparatus for canceling leakage from a speaker
09/29/1998US5814752 Musical instrument crossover circuits and method of using same
09/24/1998WO1998042158A1 Method for restoring the sounds of a sport equipment and sport equipment for implementing same
09/24/1998WO1998041928A1 Method for computer-assisted extraction of statistically independent digital signals from digital signals
09/23/1998EP0700622A4 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles
09/22/1998US5812686 Device for active simultation of an acoustical impedance
09/22/1998US5812683 For powering multiple headphone jacks from a single two-channel source
09/22/1998US5812675 Sound reproducing array processor system
09/22/1998US5812598 Hearing assist system employing time variant modulation transmission to hearing aid
09/22/1998CA2124718C Sequential amplifier
09/20/1998CA2200499A1 Optimized sub-speaker module and block-like constructed multi-way active speaker system
09/17/1998WO1998040974A1 Echo reducing phone with state machine controlled switches
09/17/1998CA2283590A1 Echo reducing phone with state machine controlled switches
09/16/1998EP0865025A1 Apparatus having loudspeakers concurrently producing both music and reflected sound
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