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| Number | Title | Issue Date |
| 6519342 | Method and apparatus for filtering an audio signal A method and an apparatus for filtering an audio signal include the steps of making the audio signal available in digitalized form, wherein the duration of the sampling interval is half or less than half of the period duration of the highest frequency to ... | 02/11/2003 |
| 5903644 | Monaural communication device A monaural communication device is composed of a housing for receiving a receiver and a support component which is resiliently connected to the housing and is to be worn binaurally. The support component is constructed symmetrically and the housing and/or... | 05/11/1999 |
| 5283397 | Diaphragm for electrodynamic transducer A diaphragm with moving coil for electrodynamic transducers has in the center thereof a spherically-shaped portion and adjacent to the spherically-shaped portion a toroidally-shaped zone which may be provided with corrugations. An outwardly diverging, tru... | 02/01/1994 |
| 5146235 | Helical UHF transmitting and/or receiving antenna A helical UHF transmitting and/or receiving antenna for electromagnetic waves in the frequency range of between 400 MHz and 1000 MHz. The helical antenna is arranged within a closed housing which is permeable to HF radiation. The UHF signal is supplied to... | 09/08/1992 |
| 5033086 | Stereophonic binaural recording or reproduction method A stereophonic binaural recording and reproduction method for audio signals presented to headsets. Signals of the left stereo channel are supplied to the left ear, weighted with the outer ear transmission function of the left ear for the angle range of be... | 07/16/1991 |
| 5031216 | Device for stereophonic recording of sound events A device for the stereophonic recording of sound events by means of two microphones arranged with essentially oppositely directed orientation and mounted in replicas of the human head. The microphones are mounted in the replicas of the outer auditory meat... | 07/09/1991 |
| 4955578 | Resiliently fastened support device for a microphone A resiliently fastened support device for supporting an arrangement carrying a microphone, such as, a tripod tube, a gooseneck, a plug-type connection or the like. The support device is connected to an end of the arrangement which faces away from the micr... | 09/11/1990 |
| 4891610 | UHF-feedback oscillator A UHF-feedback oscillator for a frequency range of at least 300 MHz to 1000 MHz includes an amplifier stage, a voltage controlled tuning filter and a feedback quadripole. The feedback quadripole comprises a two- or three- loop helical waveguide resonator.... | 01/02/1990 |
| 4858719 | Pressure gradient pickup A pressure gradient pickup, particularly a capacitor microphone or a dynamic microphone, has a diaphragm arranged in a housing and at least one sound entry opening which conducts the sound to the rear side of the diaphragm. Acoustically acting phase-shift... | 08/22/1989 |
| 4817168 | Directional microphone A directional microphone operating according to the electrostatic or electrodynamic transducer principle. The pickup effect of the microphone is determined by a single phase-shifting delay line section between the rear side of the active transducer diaphr... | 03/28/1989 |
| 4790021 | Electrostatic transducer An electrostatic transducer with a diaphragm supported by means of a stretching ring, and a back plate which is formed by a thin metal plate supported on a carrier member and mounted spaced apart from the diaphragm. A plurality of support members are atta... | 12/06/1988 |
| 4005278 | Headphone The headphone preferably comprises a toroidal seal ring which rests against or surrounds the user's ear and is constituted of a soft, yielding, and preferably elastic material. The seal ring, with the headphone positioned on the head of a user, forms a co... | 01/25/1977 |
