Microphone Diversity Combining for In-Car Applications. (27th April 2010)

• Record Type: Journal Article
• Authors: Freudenberger Freudenberger, Jürgen Jürgen; Stenzel Stenzel, Sebastian Sebastian; Venditti Venditti, Benjamin Benjamin
• Other Names: Tashev Tashev Ivan Ivan Academic Editor.
• Is Part Of: EURASIP journal on advances in signal processing. Volume 2010(2010)
• Publication Date: 2010-04-27
• Subjects: Signal processing -- Periodicals; Traitement du signal; Signal processing; Periodicals; 621.3822
• DOI: 10.1155/2010/509541
• Languages: English
• ISSNs: 1687-6172

Abstract

Abstract : This paper proposes a frequency domain diversity approach for two or more microphone signals, for example, for in-car applications. The microphones should be positioned separately to insure diverse signal conditions and incoherent recording of noise. This enables a better compromise for the microphone position with respect to different speaker sizes and noise sources. This work proposes a two-stage approach. In the first stage, the microphone signals are weighted with respect to their signal-to-noise ratio and then summed similar to maximum ratio combining. The combined signal is then used as a reference for a frequency domain least-mean-squares (LMS) filter for each input signal. The output SNR is significantly improved compared to coherence-based noise reduction systems, even if one microphone is heavily corrupted by noise.