Microphone capsule, microphone assembly comprising multiple microphone capsules, and method for calibrating a microphone array

Abstract

Microphone capsules for capacitive or electret microphones often have individual deviations from a desired ideal electro-acoustic response, e.g. the frequency response and the phase response. In particular when multiple microphone capsules are connected together to form a microphone array, suitable microphone capsules have to be found in a selection process. Some of these deviations can be corrected electronically, e.g. by filtering with an appropriately individually adjusted filter. The invention relates to an improved microphone capsule (200), by means of which automatic selection and automatic population of circuit boards with microphone capsules is made easier, and which contains an electrostatic acoustic converter (CT), an amplifier element (Q1) that outputs an amplified output signal (AS, DS) from the electrostatic acoustic converter (CT), and at least one electronic storage element (U1). In the latter, data obtained by a measurement, which relates to the individual frequency response or the phase response of the respective microphone capsule, can be stored. The data can be read during manufacture and during operation, which means that both automatic sorting of the capsules during production and automatic calibration of the target circuit during operation are possible.

Description

technical field [0001] The invention relates to a microphone capsule, a microphone arrangement with a plurality of microphone capsules and a method for calibrating the microphone arrangement. Background technique [0002] A microphone capsule is a component used in a microphone and is usually soldered on a circuit board here. Microphone capsules for condenser microphones or electret microphones are usually produced in so-called stacking technology, in which several components are stacked one after the other into the housing. However, there are component tolerances which lead to individual deviations of each microphone capsule from ideal electroacoustic properties, such as frequency response and / or phase response, for example. In the case of high quality requirements, and in particular when several microphone capsules are connected together in a microphone array, these deviations must be corrected electronically, for example by filtering by means of corresponding individuall...

AI Technical Summary

Problems solved by technology

If this measurement is taken after the microphone capsule is soldered to the circuit board, the surrounding circuitry may distort the results

If the measurement is carried out before welding, the following problem arises: The capsules must be sorted according to the measurement results

This error-prone and time-consuming selection, which is usually performed manually, in particular makes it more difficult and expensive to equip circuit boards with microphone capsules by machine

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