| Patents for H04R 29 - Monitoring arrangements; Testing arrangements (4,957) |
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| 07/29/1997 | US5652566 Alarm system |
| 07/22/1997 | US5651070 Warning device programmable to be sensitive to preselected sound frequencies |
| 07/17/1997 | WO1997025834A2 Method and device for processing a multi-channel signal for use with a headphone |
| 07/17/1997 | WO1997025790A2 Noise cancellation and noise reduction apparatus |
| 07/16/1997 | CA2167219A1 Active speaker system with automatic power on/off capability |
| 07/01/1997 | US5644505 Universal audio analyzer |
| 06/26/1997 | WO1997023117A1 Virtual electroacoustic audiometry for unaided, simulated aided, and aided hearing evaluation |
| 06/26/1997 | WO1997023068A2 An adaptive noise cancelling arrangement, a noise reduction system and a transceiver |
| 06/25/1997 | CN1152851A Measuring method and system for parameters of electro-acoustic transducing device |
| 06/19/1997 | DE19703320A1 Stereo signal adaptor for matching hearing ability of hard-of- hearing person to music on head-phones |
| 05/29/1997 | WO1997019573A1 An apparatus and method for monitoring magnetic audio systems |
| 05/20/1997 | US5631566 Radio speaker short circuit detection system |
| 05/13/1997 | US5629985 Apparatus and methods for auditory conditioning |
| 05/07/1997 | EP0772374A2 Method and apparatus for controlling the performance of a loudspeaker in a room |
| 05/06/1997 | US5627899 Compensating filters |
| 04/30/1997 | DE19544152C1 Electro=acoustic emergency warning system with testing device e.g. for telephone system |
| 04/29/1997 | US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system |
| 04/23/1997 | EP0769888A2 System and method for testing communications devices |
| 04/23/1997 | CN2253087Y Vibrating diaphragm resonant frequency auto-testing grading machine |
| 04/18/1997 | CA2187472A1 System and method for testing communications devices |
| 04/09/1997 | EP0767569A1 Method and device for adaptive identification and related adaptive echo canceller |
| 04/01/1997 | US5617331 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles |
| 03/27/1997 | WO1997011533A1 A directional acoustic signal processor and method therefor |
| 03/20/1997 | DE19534471A1 Assessing loudspeaker timbre for stereo systems |
| 02/05/1997 | EP0756741A1 Methods and apparatus for adaptive beamforming |
| 01/21/1997 | US5596647 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles |
| 12/03/1996 | US5581621 Automatic adjustment system and automatic adjustment method for audio devices |
| 12/03/1996 | US5581620 Signal processing apparatus |
| 11/26/1996 | US5578987 Monitoring apparatus for an alarm device |
| 11/21/1996 | WO1996036862A1 Intensity acoustic calibrator |
| 11/21/1996 | DE19612981A1 Acoustic testing system for loudspeakers of stereo equipment |
| 11/21/1996 | CA2221244A1 Intensity acoustic calibrator |
| 11/14/1996 | WO1996029779A3 A method for implementing a sound reproduction system for a large space, and a sound reproduction system |
| 11/13/1996 | EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system |
| 11/07/1996 | WO1996035314A1 Process for controlling a programmable or program-controlled hearing aid for its in-situ fitting adjustment |
| 10/22/1996 | US5567863 For testing microphones |
| 10/09/1996 | EP0736775A2 Circuit for testing the connection of a reproduction set to a source of audio signals |
| 10/08/1996 | US5563953 Apparatus and method for evaluating audio distorting |
| 10/01/1996 | US5561737 Voice actuated switching system |
| 09/26/1996 | WO1996029779A2 A method for implementing a sound reproduction system for a large space, and a sound reproduction system |
| 09/19/1996 | WO1996028953A1 Signal quality determining device and method |
| 09/19/1996 | WO1996028952A1 Signal quality determining device and method |
| 09/19/1996 | WO1996028950A1 Signal quality determining device and method |
| 09/10/1996 | US5555311 Electro-acoustic system analyzer |
| 08/20/1996 | US5548656 Remote method and apparatus for listening to birds |
| 08/06/1996 | US5544249 Method of simulating a room and/or sound impression |
| 08/06/1996 | US5544248 Audio data file analyzer apparatus |
| 06/12/1996 | EP0716403A1 Monitor apparatus of alarm apparatus |
| 06/04/1996 | US5524056 Hearing aid having plural microphones and a microphone switching system |
| 05/23/1996 | WO1996015646A1 Noise cancellation headset for use with stand or worn on ear |
| 05/23/1996 | WO1996015541A1 Noise cancellation apparatus |
| 05/23/1996 | CA2204115A1 Noise cancellation headset for use with stand or worn on ear |
| 05/22/1996 | CN2227900Y Acoustics monitor |
| 05/07/1996 | US5515445 Long-time balancing of omni microphones |
| 04/24/1996 | CN1121301A Long-time balancing of omni microphones |
| 04/23/1996 | US5511129 Method of conditioning programmable filter apparatus |
| 03/13/1996 | EP0700622A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles |
| 02/13/1996 | US5491753 Method and device for testing for audio induced sympathetic buzzes |
| 01/16/1996 | US5485514 Telephone instrument and method for altering audible characteristics |
| 01/11/1996 | WO1996000955A1 Monitor apparatus of alarm apparatus |
| 01/03/1996 | EP0690656A2 Long-time balancing of omni microphones |
| 01/02/1996 | US5481618 Interconnection of a speaker using magnetic coupling |
| 12/20/1995 | CN1113627A Noise-canceling differential microphone assembly |
| 12/13/1995 | EP0687126A1 Audio-frequency filter and method for determining the filtering function of an audio-frequency filter |
| 12/12/1995 | US5475709 Adjacent and alternate channels power measurement apparatus |
| 12/07/1995 | DE4418203A1 Adaptation of transmission characteristic of hearing aid to user |
| 12/05/1995 | US5473684 Noise-canceling differential microphone assembly |
| 11/21/1995 | US5469405 Detection method and apparatus |
| 11/15/1995 | EP0682436A2 Voice actuated switching system |
| 11/14/1995 | US5465469 Method for measuring sound absorption power of a theater chair with a dummy representing a human being seated thereon |
| 11/09/1995 | WO1995030323A1 Process and device for compensating for acoustic distortion |
| 11/02/1995 | WO1995029479A1 Methods and apparatus for adaptive beamforming |
| 10/25/1995 | EP0679044A2 Noise-canceling differential microphone assembly |
| 10/18/1995 | CN1110462A Apparatus and method for evaluating audio distortions |
| 10/03/1995 | US5455868 Gunshot detector |
| 09/12/1995 | US5450624 Method and apparatus for diagnosing amp to speaker connections |
| 08/01/1995 | US5438700 Digital mobile radio communication apparatus |
| 07/26/1995 | EP0664071A1 Hearing aid having a microphone switching system |
| 05/24/1995 | EP0654955A1 Method and device for testing for audio induced sympathetic vibrations |
| 05/24/1995 | DE4339906A1 Interference monitoring for signal processor or communication system |
| 05/23/1995 | CA2136267A1 Radio speaker short circuit detection system |
| 05/23/1995 | CA2136253A1 Method and device for testing for audio induced sympathetic buzzes |
| 05/18/1995 | EP0664071A4 Hearing aid having a microphone switching system. |
| 05/11/1995 | DE4338215A1 Method for determining the initial setting of hearing aids |
| 04/04/1995 | US5402669 Sensor matching through source modeling and output compensation |
| 03/28/1995 | US5402495 Method and apparatus for evaluating audio distortion |
| 03/01/1995 | EP0641143A2 Method for simulating spatial and/or sonic impression |
| 03/01/1995 | EP0640839A2 Apparatus and method for evaluating audio distortions |
| 02/14/1995 | US5389009 For testing a hearing aid instrument |
| 01/31/1995 | US5386475 Real-time hearing aid simulation |
| 01/17/1995 | US5383133 Integrated vibration reducing and health monitoring system for a helicopter |
| 01/10/1995 | US5381473 Noise cancellation apparatus |
| 01/10/1995 | US5381381 Far field acoustic radiation reduction |
| 12/27/1994 | US5377274 Correction circuit and method for improving the transient behavior of a two-way loudspeaker system |
| 12/22/1994 | DE4319764A1 Measuring device for determining the parameters, such as frequency response and directional response, characterising a microphone |
| 12/21/1994 | EP0629869A1 Test apparatus |
| 12/21/1994 | CN1096621A Noise cancellation apparatus |
| 12/08/1994 | WO1994028679A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles |
| 12/01/1994 | DE4318365A1 Circuit arrangement for functional monitoring of acoustic transmitting devices (transmitters) |
| 11/15/1994 | US5365219 Conversation level warning device |