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