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www.akutek.info was launched 17.08.2006              Latest change 05.02.2012                         Latest NEWS;           E-mail: akutek@akutek.info

This site is dedicated to topics in room acoustics, music acoustics, speech acoustics, perception and their interrelation in general, and concert hall acoustics and stage acoustics in particular.

Acoustic Visualization

The Doppler Effect and Sonic Booms (animation)

Typical values of LF and 1-IACC in famous concert halls

The acoustics of harmonic singing

A Krokstad: "The common-mode rejection of the ear and its influence on the hearing of born and unborn"

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Sound Strength in Small Halls
by Hyde and Möller

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This week:
Sound Coloration
by T Halmrast

Coloration is defined as changes in Timbre/ ”Klangfarbe”. Adding a reflection automatically changes the frequency response of a signal, giving some kind of coloration. This might be looked upon as distortion. However, reflections have been a part of sound distribution since the Greek amphi-theatres, indicating that some coloration must be acceptable, even “wanted”. The question is:

“Which reflections give disturbing coloration?

On an orchestra platform a strong, discrete reflection arriving some 5-20 msec after the direct sound will give a Box-Klangfarbe. For such reflections, the “Comb- Between-Teeth-Bandwidth” is comparable to the Critical Bandwidth. Adding more ”diffuse”/scattered reflections with time delays of some 5-20 msec will reduce Box-Klangfarbe. Our results on coloration for orchestra shows good agreement with psycho-acoustical studies on coloration, taking practical/musical situations into consideration.