Re: Acoustic Flow Field Generation (Bradley Wood Libbey )

Subject: Re: Acoustic Flow Field Generation
From:    Bradley Wood Libbey  <gt1556a(at)PRISM.GATECH.EDU>
Date:    Thu, 30 Aug 2001 08:57:11 -0400

Mike, I have also noted degraded recordings from loudspeakers in enclosed environments. When I record speech from a loudspeaker and then play this recording back to a listener on headphones I find it to be less intelligible than a person simply listening to the loudspeaker in the same environment. Even though I took considerable pains to calibrate and balance the recording and playback equipment. Unfortunately I don't have a direct answer, but in my case I suspect it is related to imperfect recordings interacting with the acoustic environment. For example the interaction of reverberation, noise, and the directionality of the ears vs. microphones (in your case it may be related to the directionality of the loudspeakers vs. human-speakers). I suspect that better recording equipment and perfecting the calibration/balancing/directionality of equipment might help and of course reducing the noise. I would appreciate hearing about any answers you find through your research. To close on a more interesting note, the listeners ability to localize a source certainly must be important to the realness of the walking sensation. I'm speculating that Doppler shift at walking speeds would probably NOT be detectable for speech sounds especially considering the reverberation in a hall, but it is a thought to ponder. What about turbulent air flow noise over the pinna? Sincerely, Brad Libbey Georgia Institute of Technology On Wed, 29 Aug 2001, Michael S. Gordon wrote: > Dear List - > I am interested in capturing the acoustic flow field of a person walking > down a hallway. Thus far I have made a couple of binaural recordings of (1) > a perceiver walking past individuals reading text (live) and (2) a perceiver > walking past a series of loudspeakers projecting an assortment of recorded > sounds (e.g., human speech, typewriter clicks, etc.). Those who have > listened to these recordings have found the first set a much more compelling > indication of the listenerąs motion than the second. There are several > reasons why this may have been the case: the live readers were fewer, more > sparsely located, and generally louder than the recordings via loudspeakers. > I am writing to the list because I was hoping that some of you might > have some intuitions or know some references that would help guide me to > more successfully capture the acoustic flow field of a person walking > through a hallway. Specifically I am wondering whether live sounds should be > easier to localize through a loudspeaker than recorded sounds? Furthermore > should the localizability of the sound sources contribute to the Śrealnessą > of the walking event for a listener? I would greatly appreciate any > thoughts on this issue. > > > Respectfully, > > Mike Gordon > -- > Michael S. Gordon > Ecological Acoustics Laboratory > Department of Psychology > University of California, Riverside > Riverside, CA 92521 > USA > 909-787-4579 > mike.gordon(at) > > > >

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