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Re: Contexts.

Posted by Paul Eizik (A) on January 17, 2006 at 11:14:05

In Reply to: I would have to say posted by EGeddes on January 16, 2006 at 21:02:11:

Dr. Geddes

The Haas quote was in the context of Everest's sub chapter "The Precedence Effect" (spelling correct this time, as we both have mispelled it). Haas' translated JAES paper "The influence of a single echo on the audibility of speech" is referenced. Everest and Haas are describing a percieved effect, and not necessarily promoting the said "pleasant" effect as an acoustical design tool. Everest notes that the transition zone between the areas where the delayed sounds are integrated with the direct sound, and the point where they are perceived as discrete echos is "...gradual, and therefore, somewhat indefinite." He states that some define this transition as 80 msec, and others at 100 msec as the point where there can be no question that a discrete echo is perceived. He settles on the first 30 msec to define the area of integration. It's interesting that Blauert uses 50 msec and introduces an "annoying" factor. Even more interesting is that the Haas' paper was originally published in
German in 1951, but was'nt translated to English (in the JAES version) untill 1972. Blauert's book "Spatial Hearing, 1983" is referenced by Everest in a discussion of image localization and how the perception of which changes considerably with frequency. Everest notes that "This is an active area of research that is being cotinually refined." Haas' focus was speech inteligbility so one can assume that recorded speech was used in the original study, while Blauert seems to have been using test signals (100 to 10K Hz are mentioned by Everest). Considering the different test situations and areas of focus, it does'nt seem to me that these experts are really at odds with each other.

Paul

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