Sennheiser Electronic Gmbh & Co Kg

Alexander Nowak

Heinz Epping

Alexander Krüger

Guenter Rosen

Eugen Rasumow

Marios Athineos

Microphone capsules for condenser or electret microphones often exhibit individual deviations from a desired ideal behavior, e.g. the frequency response and phase response. Particularly if a plurality of microphone capsules are interconnected to form a microphone array, suitable microphone capsules must be found in a selection process. Some of these deviations can be corrected electronically, e.g. by filtering with a corresponding filter that is individually adapted. An improved microphone capsule, with which an automatic selection and automatic assembly of circuit boards with microphone capsules is facilitated, comprises an electrostatic sound transducer, an amplifier element that outputs an amplified output signal of the electrostatic sound transducer, and at least one electronic memory element. Data obtained by a measurement and relating to the individual frequency response or phase response of the respective microphone capsule can be stored therein. The data can be read out during manufacturing and during operation, which enables automatic sorting of the capsules during production and automatic calibration of the target circuit in operation.

Microphone capsule, microphone arrangement with a plurality of microphone capsules and method for calibrating a microphone array

Microphone arrays comprise several microphone capsules, the outputs of which being electronically combined for directional recording of sound. The directional and frequency properties of the microphone array depend on the number and positions of the microphone array. In order to obtain the smallest possible microphone array with only few microphone capsules, which, however, has an essentially uniform directional and frequency dependence over a speech frequency range, is scalable and robust against small incorrect positioning of the capsules, fifteen or twenty-one microphone capsules (K-K, K-K) are arranged on a carrier such that they lie on three similar branches, each with the same number of microphone capsules, which are rotated against each other by 120&#xb0;. Each of the microphone capsules lies on a corner of a triangle of a grid in a flat isometric coordinate system with three axes rotated by 120&#xb0; against each other and forming the grid of equilateral triangles.

Microphone array

An audio processing unit having a first and second input for receiving output signals of a microphone with a first and a second physically symmetrically structured microphone capsule. The audio processing unit further has a first filter unit and a first delay unit which is coupled to the first input, and a second filter unit and a second delay unit which is coupled to the second input. The audio processing unit further has an adding unit for adding signals from the first and second filter units and a control unit for influencing the filter parameters of the first and second filters and/or the delay times of the first and second delay units depending on an amplitude of an audio signal received via the first and/or second input. A directivity factor of the output signal of the microphone is controlled depending on the amplitude of the output signal of the microphone.

Audio processing unit and method of processing an audio signal

The electroacoustic transducer according to the invention has at least one diaphragm and at least one counterelectrode. In that case the diaphragm and/or the counterelectrode each have at least two electrically mutually insulated segments. In that arrangement the segments are so adapted that different electric signals are supplied or that different electric signals are delivered in response to exposure to sound of the sound transducer.

Electroacoustic sound transducer

There is provided a capacitor microphone comprising a microphone capsule (), which has an at least partially electrically conductive diaphragm () and a counterelectrode () associated therewith. The counterelectrode () has a printed circuit board () having a carrier of an insulating material () and at least one electrically conductive surface ().

Condenser microphone

There is provided a condenser microphone including a microphone capsule having a diaphragm and a capsule mounting, and a sound guide unit for guiding sound. The sound guide unit is provided at at least one side of the capsule mounting.

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Hannover, Germany

Alexander Nowak