Publications – Details
A Differential Microphone Array with Input Level Alignment, Directional Equalization and Fast Notch Adaptation for Handsfree Communication
- Authors:
- Bernd Geiser, Hauke Krüger, Peter Vary, and Detlef Wiese
- Book Title:
- ITG-Fachtagung Sprachkommunikation
- Venue:
- Erlangen, Germany
- Event Date:
- 24.-26.9.2014
- Organization:
- ITG, VDE
- Date:
- Sept. 2014
- Language:
- English
Abstract
We revisit the standard differential microphone of [1] and propose three algorithmic enhancements. First, a simple alignment procedure equalizes the power levels of the input signals. Second, we describe an efficient algorithm to equalize the distorted directional response of the original algorithm. This enables a wider operating frequency range and helps to reduce the noise gain of the array. Third, a fast time-domain notch adaptation algorithm is presented to reliably track interfering sound sources. Its tracking performance is not impaired by the activity of desired sound sources. Finally, we describe a fixed-point arithmetic implementation of the modified algorithm for wideband handsfree communication (fs=16 kHz) using two miniature digital MEMS microphone capsules.
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