| Patents for H04R 29 - Monitoring arrangements; Testing arrangements (4,957) |
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| 11/15/1994 | CA1333100C Emergency signal warning system |
| 11/01/1994 | US5361381 Dynamic equalizing of powered loudspeaker systems |
| 11/01/1994 | US5361305 Automated system and method for automotive audio test |
| 10/27/1994 | WO1994024834A1 Hearing aid having a microphone switching system |
| 08/03/1994 | EP0484354B1 Stereo headphone for the "in front" location of auditory events generated by stereo headphones |
| 07/27/1994 | EP0607693A2 Method and apparatus for diagnosing AMP to Speaker Connections |
| 06/28/1994 | US5325436 Method of signal processing for maintaining directional hearing with hearing aids |
| 06/07/1994 | US5319714 Audio phase polarity test system |
| 05/31/1994 | US5317273 Hearing protection device evaluation apparatus |
| 05/04/1994 | EP0595457A1 Noise cancellation apparatus |
| 04/30/1994 | CA2109440A1 Noise cancellation apparatus |
| 03/29/1994 | CA2032848C Automatic calibrating apparatus and method for second-order gradient microphone |
| 03/01/1994 | US5291183 Multi-functional alarming system |
| 02/08/1994 | US5285499 Ultrasonic frequency expansion processor |
| 11/30/1993 | US5266938 Method for calibrating a display and apparatus for implementing the same method |
| 11/11/1993 | WO1993022891A1 Sound calibrator |
| 10/27/1993 | EP0567061A1 Method and system for reproducing audio frequencies |
| 09/29/1993 | EP0561881A1 Compensating filters |
| 07/07/1993 | EP0550151A1 Digital mobile radio communication apparatus |
| 06/29/1993 | US5224170 Time domain compensation for transducer mismatch |
| 05/12/1993 | EP0541277A2 Integrated vibration reducing and structural health and usage monitoring system for a helicopter |
| 02/16/1993 | US5187692 Acoustic transfer function simulating method and simulator using the same |
| 02/09/1993 | US5185801 Correction circuit and method for improving the transient behavior of a two-way loudspeaker system |
| 01/28/1993 | DE4224338A1 Compensating sound signals according to auditorium conditions - varying high frequency range according to results of tests on room before playback |
| 12/16/1992 | EP0518326A2 Method and apparatus for the processing of acoustic information |
| 11/03/1992 | US5161197 Acoustic analysis |
| 10/21/1992 | EP0509654A2 Time domain compensation for transducer mismatch |
| 10/21/1992 | EP0509048A1 Correction circuit and method for a two-way loudspeaker system |
| 10/14/1992 | EP0508089A2 Process and appliance for testing an armature |
| 09/30/1992 | EP0505949A1 Acoustic transfer function simulating method and simulator using the same |
| 09/15/1992 | US5147986 For providing acoustic energy |
| 09/15/1992 | US5146780 Vacuum-isolation vessel and method for measurement of thermal noise in microphones |
| 09/12/1992 | CA2062533A1 Method and apparatus for testing a valve |
| 06/30/1992 | US5125260 Calibrator and calibration method for computationally compensating for phase mismatch in sound intensity probes |
| 06/25/1992 | WO1992010876A1 Compensating filters |
| 06/10/1992 | CN2107102U Microphone testing classifier |
| 06/04/1992 | DE4038211A1 Calibrating LF signal source of audiometer - storing reference levels in memory and adjusting LF source output w.r.t data for partic. transducer |
| 05/13/1992 | EP0484354A1 Stereo headphone for the "in front" location of auditory events generated by stereo headphones. |
| 01/28/1992 | CA1294893C Device adjusting the sound pattern including the time of reverberation in a room |
| 09/03/1991 | US5044373 Method and apparatus for fitting of a hearing aid and associated probe with distance measuring means |
| 08/01/1991 | DE4002645A1 Method of testing adhesion quality in piezoelectric connector - the quality is determined by ascertaining planar coupling factors of ceramic plate and contacts |
| 07/11/1991 | WO1991010284A1 Correction circuit and method for a two-way loudspeaker system |
| 07/02/1991 | US5029215 Automatic calibrating apparatus and method for second-order gradient microphone |
| 03/21/1991 | WO1991001616A3 System for the 'in front' location of auditory events generated by stereo headphones |
| 02/14/1991 | DE3925921A1 Contactless distance measurement of objects or distance changes - measuring changing voltage value and limiting permissible distances to specified region |
| 02/07/1991 | WO1991001616A2 System for the 'in front' location of auditory events generated by stereo headphones |
| 12/13/1990 | DE3919049A1 Spectacles with integral deaf aid vol. control - has visual indicator of acoustic loudness measured by integral or separate microphone |
| 10/18/1990 | DE3912582A1 Objective evaluation of headphone quality - employs graphs and experience guide data to determine ability to reproduce 3 dimensional sound without subjective factor |
| 10/17/1990 | EP0392166A2 Device for testing the electro-acoustic transmission properties of telephone apparatus |
| 08/28/1990 | US4953219 Stereo signal reproducing system using reverb unit |
| 08/08/1990 | EP0381608A2 Method and apparatus for the fitting of a hearing aid, and associated probe |
| 04/12/1990 | DE3834261A1 Test device for acoustic measurements |
| 03/13/1990 | US4908868 Phase polarity test instrument and method |
| 12/13/1989 | CN1006114B Human head vibration simulator |
| 11/01/1989 | CN1005676B Meter and measurement of harmonic distortion under great power of louderspeaker |
| 08/17/1989 | DE3803280A1 Long-term shock machine for testing acoustic transducers |
| 07/13/1989 | DE3833200A1 Method and device for calibrating public address systems |
| 07/11/1989 | US4847763 Laser audiometer system |
| 03/28/1989 | US4816743 Measuring method |
| 11/29/1988 | US4788708 Universal headset tester |
| 09/28/1988 | EP0284077A1 Process and device for determining linear deformations in an electro acoustic transfer system |
| 09/06/1988 | US4769848 Loudspeaker |
| 06/22/1988 | EP0272244A2 Method and device for determining vibration characteristics and for driving a piezoelectric transducer |
| 06/01/1988 | EP0268788A2 Method and device for testing the operation of a microphone |
| 04/19/1988 | US4739513 Method and apparatus for measuring and correcting acoustic characteristic in sound field |
| 02/16/1988 | US4725989 Method controlling the focusing of an ultrasonic field and apparatus for performing said method |
| 02/02/1988 | US4723292 Voice evacuation system |
| 01/05/1988 | USH413 Microphone output-level tester |
| 12/29/1987 | US4715219 Acoustic calibration device |
| 09/03/1987 | DE3627960C1 Monitoring device for loudspeaker installations |
| 07/29/1987 | EP0229981A1 Method for controlling the focussing characteristics of an ultrasonic field and device for carrying out said method |
| 06/30/1987 | CA1223526A2 Electroacoustic network |
| 06/16/1987 | US4674123 Test bench for the adjustment of electro-acoustic channels and particularly of devices for auditory correction |
| 04/22/1987 | CN86107182A Human head vibration simulator |
| 01/20/1987 | US4638506 Sound field simulation system and method for calibrating same |
| 12/23/1986 | US4631749 ROM compensated microphone |
| 12/09/1986 | US4628530 Automatic equalizing system with DFT and FFT |
| 08/19/1986 | CA1210095A1 Automatic equalizing system with dft or fft |
| 04/29/1986 | US4586194 Earphone characteristic measuring device |
| 03/18/1986 | US4577188 Level display device for audio signal |
| 02/10/1986 | CN85100620A Meter and measurement of harmonic distortion under great power of iouderspeaker |
| 12/27/1985 | EP0165733A2 Method and apparatus for measuring and correcting acoustic characteristic in sound field |
| 12/17/1985 | US4559569 Circuit arrangement for correcting frequency response in accordance with frequency response of a sound field |
| 07/09/1985 | US4528689 Sound monitoring apparatus |
| 06/11/1985 | US4522283 Noise measurement |
| 04/16/1985 | CA1185666A1 Electroacoustic network |
| 02/14/1985 | WO1985000509A1 Signal generation system |
| 02/12/1985 | US4498332 Test device for measuring the fit of hearing aid related devices |
| 01/29/1985 | US4496022 System for interrelating sound transducers or sound sources and their environment |
| 12/19/1984 | EP0128848A1 Test bench for an electroacoustic assembly, in particular for hearing aids |
| 09/26/1984 | EP0119791A1 Circuit arrangement for correcting frequency response in accordance with frequency response of a sound field |
| 09/26/1984 | EP0119645A1 Automatic equalizing system with discrete Fourier transform (DFT) or fast Fourier transform (FFT) |
| 09/19/1984 | EP0118734A2 Earphone characteristic measuring device |
| 07/03/1984 | US4458362 Automatic time domain equalization of audio signals |
| 06/13/1984 | EP0110018A1 Measuring device for testing the density of an ear impression and/or an otoplastic |
| 02/14/1984 | US4430883 Device for the calibration of an ultrasonic transducer |
| 12/20/1983 | US4421949 Electroacoustic network |
| 11/23/1983 | EP0094762A2 Automatic time domain equalization of audio signals |
| 09/27/1983 | US4406921 Apparatus for improving linearity of electromechanical transducers |
| 05/17/1983 | CA1146633A1 Tuning and volume indicator |