Optimal and Adaptive Microphone Arrays for Speech Input in Automobiles
Blekinge Institute of Technology, Department of Telecommunications and Signal Processing2001 (English)In: Microphone Arrays: Signal Processing Techniques and Applications / [ed] Ward, Michael S. Brandstein and Darren B., Springer Verlag , 2001, 307-330 p.Chapter in book (Other academic)Alternative title
Optimala och Adaptiva Mikrofon-Arrayer för tal-signaler i bilar (Swedish)
In this chapter, speech enhancement and echo cancellation for hands-free mobile telephony is discussed. A number of microphone array methods have been tested and results from car measurements are given. Traditional methods such as linearly constrained beamforming and generalised sidelobe cancellers are discussed as well as array gain optimisation methods. An in-situ calibrated method which gives an over all improved performance is also presented. Algorithms such as LS and NLMS are used to find optimal weights. The improved performance using an LS-method is shown. This has however limitations in realtime implementations because of the numerical complexity. By introducing subband processing these limitations can be avoided. The results show a noise suppression of approximately 18 dB and hands-free loudspeaker suppression of the same order.
Kapitlet beskriver optimala och adaptiva metoder för bredbandig beamforming av talsignaler. Simuleringar med verkliga data insamlat i en bil-miljö presenteras.
Place, publisher, year, edition, pages
Springer Verlag , 2001. 307-330 p.
Beamforming, Subband, Speech Enhancement, Arrays
IdentifiersURN: urn:nbn:se:bth-9689Local ID: oai:bth.se:forskinfoA940DE115D0B71CDC1256B5200296395ISBN: 3-540-41953-5OAI: oai:DiVA.org:bth-9689DiVA: diva2:837600