Patents for H04R 29 - Monitoring arrangements; Testing arrangements (4,957)
05/1983
05/10/1983US4382398 Method and apparatus for eliminating feedback in stage monitors
04/1983
04/06/1983EP0075615A1 Sound field simulation system and method for calibrating same
03/1983
03/03/1983WO1983000792A1 Container for acoustic testing
02/1983
02/15/1983US4374435 Passenger entertainment system transducer failure detector
12/1982
12/08/1982EP0066515A1 Apparatus to generate noise and device to control the acoustic insulation in buildings
11/1982
11/02/1982US4357499 Acoustic test box
10/1982
10/26/1982US4356356 Headset/groundcord tester apparatus
09/1982
09/07/1982US4348750 Energy control device
08/1982
08/31/1982US4347410 Microphone droop and sensitivity measurement device
08/24/1982US4346268 Automatic audiological analyzer
04/1982
04/20/1982US4325455 Loudspeaker grille
03/1982
03/17/1982EP0047281A1 Automatic corrector for the frequency transmission characteristics of an electro acoustic channel
12/1981
12/15/1981US4306113 Method and equalization of home audio systems
11/1981
11/03/1981US4298965 Directivity display device and method
09/1981
09/17/1981WO1981002658A1 Automatic corrector for the frequency transmission characteristics of an electro acoustic channel
09/15/1981US4289143 Method of and apparatus for audiometrically determining the acoustic impedance of a human ear
08/1981
08/18/1981US4284860 Time doman measurement of moving coil loudspeaker driver parameters
05/1981
05/26/1981US4270216 Tuning and volume indicator
05/05/1981CA1100621A1 Artificial ear for telephonometric measurements
10/1980
10/15/1980EP0016820A1 Method and apparatus for measuring attack and release times of hearing aids
09/1980
09/16/1980US4223397 Turbulent flow device for testing hydrophones
08/1980
08/20/1980EP0014324A2 Device for measuring the acoustical ear impedance
06/1980
06/24/1980US4209672 Method and apparatus for measuring characteristics of a loudspeaker
05/1980
05/27/1980US4205394 Sealed cavity hydrophone array calibration
04/1980
04/30/1980EP0010169A1 Method and device to measure, control and in particular to adjust the maximum sound pressure output of hearing aids
04/30/1980EP0010168A1 Method and arrangement to select, adapt, adjust, measure and test hearing aids
03/1980
03/20/1980WO1980000519A1 Method and apparatus for measuring attack and release times of hearing aids
03/04/1980US4191864 Method and apparatus for measuring attack and release times of hearing aids
03/04/1980US4190937 Method of manufacturing electroacoustic transducer elements which operate in the vicinity of resonance
09/1979
09/25/1979CA1063177A1 Supervisory circuit for monitoring speaker coils
05/1979
05/01/1979US4152555 Artificial ear for telephonometric measurements
02/1979
02/08/1979WO1979000046A1 A dereverberation system
12/1978
12/19/1978US4130023 Method and apparatus for testing and evaluating loudspeaker performance
12/19/1978CA1044762A1 Speaker supervision in a public address system
11/1978
11/07/1978US4124786 Speaker comparator devices and methods of making and using the same
09/1978
09/12/1978CA1038486A1 Acoustic emission transducer calibration
08/1978
08/29/1978US4110571 Test unit for stereophonic speaker systems
07/1978
07/11/1978US4100380 Supervisory circuit for monitoring speaker coils
06/1978
06/13/1978US4095057 Frequency response testing apparatus
05/1978
05/02/1978US4087633 Dereverberation system
03/1978
03/07/1978US4078233 Analog to digital converter circuit with gain ranging feedback
12/1977
12/27/1977US4065647 Automatic acoustical testing system
12/06/1977US4061891 Test instrument for determining apparent power consumption and ground faults in various portions of a distributed-load, constant voltage audio distribution system
11/1977
11/29/1977US4060701 Method for testing acoustical attenuation of hearing protectors
11/15/1977US4058675 Loudspeaker system for use in a stereophonic sound reproduction system
08/1977
08/02/1977US4039767 Acoustic emission transducer calibration
08/02/1977US4039750 Audio frequency phase modulator in hearing test system
07/1977
07/26/1977US4038500 Microphone coupler
07/19/1977US4037222 Supervision of transducers
04/1977
04/26/1977US4020298 Apparatus for testing acoustical attenuation of hearing protectors
03/1977
03/01/1977US4010492 Using a radio feedback link to the engineer
01/1977
01/18/1977US4004111 Horn testing device
01/11/1977US4002862 Sound audit station and method of testing electric horns
12/1976
12/14/1976US3997724 Loudspeaker drive mechanism monitoring assembly
11/1976
11/02/1976US3989908 Speaker supervision in a public address system
10/1976
10/12/1976US3985960 Stereophonic sound reproduction with acoustically matched receiver units effecting flat frequency response at a listener's eardrums
09/1976
09/07/1976US3979567 Microphone coupler for hearing aid having inverted conical end configuration
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