Microphone calibration with an RGSC beamformer
AssigneeSiemens Audiologische Technik GmbH
InventorsWalter Kellermann, Parijat Ashok Oak
Life of this patent
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Abstract
It is intended to improve and automate the calculation of calibration filters connected downstream from the microphones of an RGSC beamformer. To this end it is proposed that an adaptive calibration filter calculation unit be used, by means of which calibration filters are calculated from the output signals of adaptive blocking filters such that the power of an output signal of a blocking filter subtracted from a reference signal and filtered by means of a calibration filter respectively is minimized. The calibration filters connected downstream from the microphones are then replaced by the calibration filters thus determined.
Claims10
An RGSC beamformer, comprising:
- a plurality of microphones each generating a respective microphone signal;
- a fixed beamformer connected to the microphones;
- an adaptive blocking matrix connected to the fixed beamformer;
- an adaptive interference canceller connected to the adaptive blocking matrix;
- a calibration filter unit connected downstream from the microphones and comprising a calibration filter which compensates for a component tolerance of the microphones due to the effects of aging on the microphones;
- and
- a calibration filter calculation unit connected to the adaptive blocking matrix which calculates the calibration filter from a signal generated in the adaptive blocking matrix.
A method for operating an RGSC beamformer, comprising:
- generating a microphone signal from a microphone;
- connecting a fixed beamformer to the microphone;
- connecting an adaptive blocking matrix to the fixed beamformer;
- connecting an adaptive interference canceller to the adaptive blocking matrix;
- connecting a calibration filter unit comprising a calibration filter downstream from the microphone;
- compensating for a component tolerance of the microphone by the calibration filter wherein the component tolerance is due to the effects of aging on the microphone;
- calculating the calibration filter adaptively by a signal generated from the adaptive blocking matrix;
- and
- filtering the microphone signal by the calibration filter.
Dependencies are inferred from the claim text.