Title page for ETD etd-06032004-123749


Type of Document Master's Thesis
Author Collins, Christopher Michael
Author's Email Address christophercollins@vt.edu
URN etd-06032004-123749
Title Development of a Virtual Acoustic Showroom for Simulating Listening Environments and Audio Speakers
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Johnson, Martin E. Committee Chair
Carneal, James P. Committee Co-Chair
Bowman, Douglas A. Committee Member
Keywords
  • Virtual Acoustics
  • Image Source
  • Inverse Filter
Date of Defense 2004-05-24
Availability unrestricted
Abstract
Virtual acoustic techniques can be used to create virtual listening environments for multiple purposes. Using multi-speaker reproduction, a physical environment can take on the acoustical appearance of another environment. Implementation of this environment auralization could change the way customers evaluate speakers in a retail store.

The objective of this research is to develop a virtual acoustic showroom using a multi- speaker system. The two main components to the virtual acoustic showroom are simulating living environments using the image source method, and simulating speaker responses using inverse filtering. The image source method is used to simulate realistic living environments by filtering the environment impulse response by frequency-dependant absorption coefficients of typical building materials. Psychoacoustic tests show that listeners can match virtual acoustic cues with appropriate virtual visual cues. Inverse filtering is used to "replace" the frequency response function of one speaker with another, allowing a single set of speakers to represent any number of other speakers. Psychoacoustic tests show that listeners could not distinguish the difference between the original speaker and the reference speaker that was mimicking the original. The two components of this system are shown to be accurate both empirically and psychologically.

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