Patents for H04R 29 - Monitoring arrangements; Testing arrangements (4,957)
07/1997
07/29/1997US5652566 Alarm system
07/22/1997US5651070 Warning device programmable to be sensitive to preselected sound frequencies
07/17/1997WO1997025834A2 Method and device for processing a multi-channel signal for use with a headphone
07/17/1997WO1997025790A2 Noise cancellation and noise reduction apparatus
07/16/1997CA2167219A1 Active speaker system with automatic power on/off capability
07/01/1997US5644505 Universal audio analyzer
06/1997
06/26/1997WO1997023117A1 Virtual electroacoustic audiometry for unaided, simulated aided, and aided hearing evaluation
06/26/1997WO1997023068A2 An adaptive noise cancelling arrangement, a noise reduction system and a transceiver
06/25/1997CN1152851A Measuring method and system for parameters of electro-acoustic transducing device
06/19/1997DE19703320A1 Stereo signal adaptor for matching hearing ability of hard-of- hearing person to music on head-phones
05/1997
05/29/1997WO1997019573A1 An apparatus and method for monitoring magnetic audio systems
05/20/1997US5631566 Radio speaker short circuit detection system
05/13/1997US5629985 Apparatus and methods for auditory conditioning
05/07/1997EP0772374A2 Method and apparatus for controlling the performance of a loudspeaker in a room
05/06/1997US5627899 Compensating filters
04/1997
04/30/1997DE19544152C1 Electro=acoustic emergency warning system with testing device e.g. for telephone system
04/29/1997US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system
04/23/1997EP0769888A2 System and method for testing communications devices
04/23/1997CN2253087Y Vibrating diaphragm resonant frequency auto-testing grading machine
04/18/1997CA2187472A1 System and method for testing communications devices
04/09/1997EP0767569A1 Method and device for adaptive identification and related adaptive echo canceller
04/01/1997US5617331 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles
03/1997
03/27/1997WO1997011533A1 A directional acoustic signal processor and method therefor
03/20/1997DE19534471A1 Assessing loudspeaker timbre for stereo systems
02/1997
02/05/1997EP0756741A1 Methods and apparatus for adaptive beamforming
01/1997
01/21/1997US5596647 Integrated video and audio signal distribution system and method for use on commercial aircraft and other vehicles
12/1996
12/03/1996US5581621 Automatic adjustment system and automatic adjustment method for audio devices
12/03/1996US5581620 Signal processing apparatus
11/1996
11/26/1996US5578987 Monitoring apparatus for an alarm device
11/21/1996WO1996036862A1 Intensity acoustic calibrator
11/21/1996DE19612981A1 Acoustic testing system for loudspeakers of stereo equipment
11/21/1996CA2221244A1 Intensity acoustic calibrator
11/14/1996WO1996029779A3 A method for implementing a sound reproduction system for a large space, and a sound reproduction system
11/13/1996EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system
11/07/1996WO1996035314A1 Process for controlling a programmable or program-controlled hearing aid for its in-situ fitting adjustment
10/1996
10/22/1996US5567863 For testing microphones
10/09/1996EP0736775A2 Circuit for testing the connection of a reproduction set to a source of audio signals
10/08/1996US5563953 Apparatus and method for evaluating audio distorting
10/01/1996US5561737 Voice actuated switching system
09/1996
09/26/1996WO1996029779A2 A method for implementing a sound reproduction system for a large space, and a sound reproduction system
09/19/1996WO1996028953A1 Signal quality determining device and method
09/19/1996WO1996028952A1 Signal quality determining device and method
09/19/1996WO1996028950A1 Signal quality determining device and method
09/10/1996US5555311 Electro-acoustic system analyzer
08/1996
08/20/1996US5548656 Remote method and apparatus for listening to birds
08/06/1996US5544249 Method of simulating a room and/or sound impression
08/06/1996US5544248 Audio data file analyzer apparatus
06/1996
06/12/1996EP0716403A1 Monitor apparatus of alarm apparatus
06/04/1996US5524056 Hearing aid having plural microphones and a microphone switching system
05/1996
05/23/1996WO1996015646A1 Noise cancellation headset for use with stand or worn on ear
05/23/1996WO1996015541A1 Noise cancellation apparatus
05/23/1996CA2204115A1 Noise cancellation headset for use with stand or worn on ear
05/22/1996CN2227900Y Acoustics monitor
05/07/1996US5515445 Long-time balancing of omni microphones
04/1996
04/24/1996CN1121301A Long-time balancing of omni microphones
04/23/1996US5511129 Method of conditioning programmable filter apparatus
03/1996
03/13/1996EP0700622A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles
02/1996
02/13/1996US5491753 Method and device for testing for audio induced sympathetic buzzes
01/1996
01/16/1996US5485514 Telephone instrument and method for altering audible characteristics
01/11/1996WO1996000955A1 Monitor apparatus of alarm apparatus
01/03/1996EP0690656A2 Long-time balancing of omni microphones
01/02/1996US5481618 Interconnection of a speaker using magnetic coupling
12/1995
12/20/1995CN1113627A Noise-canceling differential microphone assembly
12/13/1995EP0687126A1 Audio-frequency filter and method for determining the filtering function of an audio-frequency filter
12/12/1995US5475709 Adjacent and alternate channels power measurement apparatus
12/07/1995DE4418203A1 Adaptation of transmission characteristic of hearing aid to user
12/05/1995US5473684 Noise-canceling differential microphone assembly
11/1995
11/21/1995US5469405 Detection method and apparatus
11/15/1995EP0682436A2 Voice actuated switching system
11/14/1995US5465469 Method for measuring sound absorption power of a theater chair with a dummy representing a human being seated thereon
11/09/1995WO1995030323A1 Process and device for compensating for acoustic distortion
11/02/1995WO1995029479A1 Methods and apparatus for adaptive beamforming
10/1995
10/25/1995EP0679044A2 Noise-canceling differential microphone assembly
10/18/1995CN1110462A Apparatus and method for evaluating audio distortions
10/03/1995US5455868 Gunshot detector
09/1995
09/12/1995US5450624 Method and apparatus for diagnosing amp to speaker connections
08/1995
08/01/1995US5438700 Digital mobile radio communication apparatus
07/1995
07/26/1995EP0664071A1 Hearing aid having a microphone switching system
05/1995
05/24/1995EP0654955A1 Method and device for testing for audio induced sympathetic vibrations
05/24/1995DE4339906A1 Interference monitoring for signal processor or communication system
05/23/1995CA2136267A1 Radio speaker short circuit detection system
05/23/1995CA2136253A1 Method and device for testing for audio induced sympathetic buzzes
05/18/1995EP0664071A4 Hearing aid having a microphone switching system.
05/11/1995DE4338215A1 Method for determining the initial setting of hearing aids
04/1995
04/04/1995US5402669 Sensor matching through source modeling and output compensation
03/1995
03/28/1995US5402495 Method and apparatus for evaluating audio distortion
03/01/1995EP0641143A2 Method for simulating spatial and/or sonic impression
03/01/1995EP0640839A2 Apparatus and method for evaluating audio distortions
02/1995
02/14/1995US5389009 For testing a hearing aid instrument
01/1995
01/31/1995US5386475 Real-time hearing aid simulation
01/17/1995US5383133 Integrated vibration reducing and health monitoring system for a helicopter
01/10/1995US5381473 Noise cancellation apparatus
01/10/1995US5381381 Far field acoustic radiation reduction
12/1994
12/27/1994US5377274 Correction circuit and method for improving the transient behavior of a two-way loudspeaker system
12/22/1994DE4319764A1 Measuring device for determining the parameters, such as frequency response and directional response, characterising a microphone
12/21/1994EP0629869A1 Test apparatus
12/21/1994CN1096621A Noise cancellation apparatus
12/08/1994WO1994028679A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles
12/01/1994DE4318365A1 Circuit arrangement for functional monitoring of acoustic transmitting devices (transmitters)
11/1994
11/15/1994US5365219 Conversation level warning device
1 ... 38 39 40 41 42 43 44 45 46 47 48 49 50