Room Acoustics Forum by Rives Audio

RE: ETC

145.64.134.223

In Reply to: RE: ETC posted by joamonte on July 08, 2009 at 14:32:37

To give you one example: some people say that comb filters are a problem and the proof is that they appear in measurements (e.g. Fig.1 on
http://www.realtraps.com/rfz.htm)
BUT
How do you know that what you measure is indeed audible?
You don't unless you go to the lab and run psychoacoustic experiments with comb filters. This has been done and subsequently thresholds of audibility do exist but simple measurements not taking such thresholds into acount are preety much meaningless:
Salomons (1995), “Coloration and binaural decoloration of sound due to reflections”, Thesis, Delft University
http://www.darenet.nl/en/page/repository.item/show?saharaIdentifier=tuddare:oai:tudelft.nl:200755
The same goes for "what happens in the first 6 or 30 ms of early reflections". The precedence effect has been studied very extensively so perceptional scientists have a good idea of what is going on:
Litovsky et al. (1999), “The precedence effect”, J. of Acoust. Soc. of America, vol. 106, p.1633
I'm not saying "do not measure but listen instead", I'm saying" measure but correlate what you've been measuring to how humans hear.
Klaus

Edits: 07/09/09

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