CASA in the lateral plane for 2 channel loudspeaker (John )

Subject: CASA in the lateral plane for 2 channel loudspeaker
From:    John  <J.S.Usher(at)STUDENT.SALFORD.AC.UK>
Date:    Thu, 1 Mar 2001 12:23:26 +0100

I am conducting a CASA based investigation to identify common musical "elements" and to predict where these elements would be percieved on playback on a conventional loudspeaker pair arrangment. The material is limited to 2 -channel, and to simplify the model, any environmental room effect is ignored (ie anachoic conditions assumed). Interaural coherence function is used as an index to identify "common" frequency elements, and phase unwrapped to time delay, and amplitude difference, are used for localisation cues. The work by Uwe Baumann on identification and segregation of auditory objects seems very relevant, but is not concerned with the complex interaction of frequency- overlapping elements, and is more to do with event analysis of mon-aural sounds I think. An integrrating time period of 100ms is assumed at the moment (this was suggested by Blaurt in Spatial hearing), and the frequency resolution is only 128 taps- so broad -band "element" envelopes are not easily seperated spatially (due to usual time/ frequency resolution trade-off's). I have been unable to find any research on perceptual effect of coherence on localisation ability for loud-speaker playback, or much information regarding the "integrating time window", and I would be extremely greatful for any help on this topics and feedback on my project idea. Regards John j.s.usher(at)

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