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I would have to say

Posted by EGeddes (P) on January 16, 2006 at 21:02:11

In Reply to: Re: I think there is a misunderstanding posted by Paul Eizik on January 16, 2006 at 20:28:32:

I would have to say that someone may be taking the Hass quotes out of context. The description in Blauert "Spatial Hearing" Pg. 226 states that "At delay times less than 50 ms. echoes are no longer perceived as annoying even if the reflection is considerably stronger than the primary sound" as the Haas efect. This does not mean that these echoes are perceived as beneficial and in fact Bluert makes a strong point of this (could not find the page) that the studies of the perception of an echo were quite independent of questions of image shift and coloration. The later effects were not factors in their experiments. Subjects were not asked is these effects occured, only if they could detect an echo.

In room acoustics it is generally held that reflections < 30 ms. - the "sound fusion" region - are generally bad things because they cause coloration (from comb filtering) and image shifts since the ear cannot sort out the refection from the direct sound.

The quotes from Haas appear completely contradictory to this. Pleasantness, in Haas's context, may be actually be sound that is "colored" with a wide "image blur", although these things are widely held by acousticians to be negative aspects for good "sound reproduction".

I agree that from what you say I may be at odds with Everest and Haas, but modern thinking along this line is pretty much along the lines that I have quoted. At least it is for me.

Earl Geddes

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