Microphone Array for Hands-Free Voice Communication in a Car

  • Stephen Oh
  • Vishu Viswanathan
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 327)


We present the results of our research on developing a speech acquisition and enhancement system so that a speech recognizer can reliably be used inside a noisy automobile environment, for the digital cellular telephone application. Our research results have demonstrated that a beamforming method with a microphone array is a reliable approach for hands-free voice dialing application in the car noise environment. Two beamforming algorithms were investigated in our research: delay-and-sum beam-former and generalized sidelobe canceler. Performance evaluation results of these two algorithms are presented for speech database collected in real cars under different noise conditions. Signal-to-noise ratio and speech recognition error rate were used as performance measures in these evaluations.


Speech Recognition Speech Data Speech Enhancement Speech Recognition System Microphone Array 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Stephen Oh
    • 1
  • Vishu Viswanathan
    • 1
  1. 1.Texas Instruments, Inc.DallasUSA

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