Title :
Adaptive microphone array employing calibration signals: an analytical evaluation
Author :
Nordholm, Sven ; Claesson, Ingvar ; Dahl, Mattias
Author_Institution :
Dept. of Signal Process., Karlskrona/Ronneby Univ., Sweden
fDate :
5/1/1999 12:00:00 AM
Abstract :
This paper gives an analytical description of an adaptive microphone array that facilitates a simple built-in calibration to the environment and instrumentation. This method, suggested for use in hands-free mobile telephones and speech recognition systems for cars, provides speech enhancement and acoustic echo-cancellation. The scheme offers several advantages, such as a simple calibration procedure, suppression of directional sources, versatile robust beamforming, and reduced target signal distortion. The analysis employs noncausal Wiener filters yielding compact and effective theoretical suppression limits
Keywords :
Wiener filters; acoustic signal processing; acoustic transducer arrays; adaptive signal processing; array signal processing; calibration; echo suppression; filtering theory; land mobile radio; microphones; noise abatement; speech enhancement; speech recognition; telephone sets; acoustic echo-cancellation; adaptive microphone array; built-in calibration; calibration signals; cars; directional sources suppression; echo suppression; hands-free mobile telephones; instrumentation; noncausal Wiener filters; reduced target signal distortion; robust beamforming; speech enhancement; speech recognition systems; theoretical suppression limits; Adaptive arrays; Array signal processing; Calibration; Echo cancellers; Instruments; Microphone arrays; Robustness; Speech enhancement; Speech recognition; Telephony;
Journal_Title :
Speech and Audio Processing, IEEE Transactions on
