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Old 14th March 2009, 06:28 AM   #11
Pano is offline Pano  United States
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Yes, the impulse measuremants will be very interesting!

Thanks for dong this.
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Old 14th March 2009, 01:39 PM   #12
HK26147 is offline HK26147  United States
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The use of the phrase "comb filter" depends on the context of use, but when graphed in a linear ( non log ) fashion the harmonic nature is very apparent.
For someone involved in setting up microphones for PA or recording, it manifests when the delayed secondary source from a reflection ( from a floor or podium ), creates constructive and destructive interference patterns with the primary source.
The Δd of the primary to secondary source ( and the delay in time ) can be such that it create patterns of cancellation and reinforcement.

In the Pro Sound area guys like Bob McCarthy deal with combing because they have big stacks of speakers to distribute sound over a large area and LF stacks will create the same effect if not dealt with appropriately. Constructive/destructive interference, is not just from a "virtual source" reflection.

This is one my favorite applets from this site
http://www.falstad.com/interference/

It demonstrates interference fairly well, between 2 sources (real or virtual ).

To TV engineers and users of music synthesizers comb filter have a use in their domain.
It is always a harmonic relationship.
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