Document Type thesis Author Name Laverty, Stephen William Email Address steve at alum.wpi.edu URN etd-051105-110646 Title Detection of Nonstationary Noise and Improved Voice Activity Detection in an Automotive Hands-free Environment Degree MS Department Electrical & Computer Engineering Advisors Dr. Donald R. Brown, Advisor Dr. Brian King, Committee Member Dr. John A. McNeill, Committee Member Keywords automobile noise reduction passing vehicle noise hands-free Date of Presentation/Defense 2005-04-25 Availability unrestricted
Speech processing in the automotive environment is a challenging problem due to the presence of powerful and unpredictable nonstationary noise. This thesis addresses two detection problems involving both nonstationary noise signals and nonstationary desired signals. Two detectors are developed: one to detect passing vehicle noise in the presence of speech and one to detect speech in the presence of passing vehicle noise. The latter is then measured against a state-of-the-art voice activity detector used in telephony. The process of compiling a library of recordings in the automobile to facilitate this research is also detailed.
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