In this paper the authors consider a two-channel diversity technique that combines the processed signals of two separate microphones. For in-car applications, this enables a better compromise for the microphone positions. The advantage of the proposed system is its insensitivity with respect to varying speaker sizes or local noise sources. To achieve this the authors choose the microphone position in that way that one microphone is optimal for a tall speaker, and the second one is suitable for a small speaker. For local noise sources they may apply a similar design to choose the microphone position in accordance with the location of the noise sources. A corresponding signal combiner has two tasks: compensation of phase shifts and weighting proportional to the signal strength. The authors propose solutions for both problems and demonstrate the effectiveness of diversity combining.
A two-microphone diversity system and its application for hands-free car kits
2005
4 Seiten, 2 Bilder, 3 Tabellen, 10 Quellen
Conference paper
English
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