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Author Topic: Church Sound System  (Read 31307 times)

David Parker

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Re: Church Sound System
« Reply #90 on: March 20, 2014, 11:07:10 am »

Combfiltering is when 2 identical signals arrive at a location slightly out of time.

It causes notches in the response.

The freq of the first notch is 1/2 of the time difference in arrival and the freq spacing of the notches is equal to the time arrival difference

Here is a link to a paper I wrote a number of years ago.  The combfilter part is a little later on in the paper.

http://www.dbaudioandvideo.com/files/resource/loudspeaker_placement_rev041021.pdf
seems I heard that comb filtering was used to create chorus effect, or was it flanging
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TJ (Tom) Cornish

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Re: Church Sound System
« Reply #91 on: March 20, 2014, 11:21:48 am »

seems I heard that comb filtering was used to create chorus effect, or was it flanging
Both of these are delay related; the difference is in the amount.

The closer in time the two signals are, the higher the frequency(s) of destructive interaction.  A flange effect is definitely comb-filtering.  A delay of a couple milliseconds is used - often a variable delay - and the resulting sound is the changing nature of the comb-filtering interaction.

Chorus effects can be more complicated, using combinations of delay (usually longer than flange delay), detuning, and other tricks.
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Ivan Beaver

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Re: Church Sound System
« Reply #92 on: March 20, 2014, 12:56:30 pm »

seems I heard that comb filtering was used to create chorus effect, or was it flanging
If you change the time of one of the arrivals it is a nice chorus effect.

Flanging is basically more than 2 arrivals at different times.

The different arrivals cause peaks and dips in the response
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

ProSoundWeb Community

Re: Church Sound System
« Reply #92 on: March 20, 2014, 12:56:30 pm »


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