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Old 5th November 2006, 12:35 AM   #1
lndm is offline lndm  Australia
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Default Baffle step phase respose

I am working on a baffle that at its extremes comes in from a flat half space section, to a quarter space section (flat baffle in a corner), as opposed to the normal half space into free space.

I am using baffle simulation software, which appears not to be designed for this. I am inverting the response it gives so there is an upward step of 6dB. I am assuming this is reasonable, if I'm wrong, please say so.

My real question is should I also mirror the phase response of the baffle around the 0 degree line?
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Old 7th November 2006, 11:02 AM   #2
lndm is offline lndm  Australia
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Old 7th November 2006, 01:00 PM   #3
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You might want to take a look at the paper "Fundamentals of Difraction" by J.R. Wright -- it was in the Journal of the Audio Engineering Society, May 1997, p347. The paper corrects some of the errors previously published in the JAES.
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Old 7th November 2006, 03:13 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

????????

Quarter space to half space in a corner ?

Baffle step is going from free space to half space.

Two walls are 1/4 space, adding the third wall = 1/8 space.

I can't see that you'd get any baffle step.

/sreten.
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Old 7th November 2006, 07:48 PM   #5
Svante is offline Svante  Sweden
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Hmm, I don't understand the question either. Maybe a drawing would help. What simulation software are you using?
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Old 7th November 2006, 09:00 PM   #6
lndm is offline lndm  Australia
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Imagine a corner, and insert a tall, 2' wide panel into it so it chamfers the corner. Ignore the floor and ceiling for the moment.

I figured that small waves contained on the baffle would be in half space, and once extended between the two intersecting walls, they would be in quarter space.

Sorry, in retrospect I don't like my wording on the first post either

I am using The Edge.
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Old 8th November 2006, 10:57 AM   #7
rabbitz is offline rabbitz  Australia
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If I understand correctly, baffle step would not be an issue as it's operating in 2PI.
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Old 8th November 2006, 11:15 AM   #8
lndm is offline lndm  Australia
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A corner as I see it, before floor or ceiling come into it, is like an orange with a quarter wedge removed or in other words, PI space. If sound from a normal box is considered to be in 2PI space whilst wavelengths are small enough to fit on the baffle.....unless I've missed something?

Svante, kudos on The Edge. I used to use a spreadsheet, but I find your program is easier to set up, easier to manipulate, covers a wider frequency range and has phase information, unlike the spreadsheet.
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Old 8th November 2006, 11:29 AM   #9
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by lndm
...

Svante, kudos on The Edge. I used to use a spreadsheet, but I find your program is easier to set up, easier to manipulate, covers a wider frequency range and has phase information, unlike the spreadsheet.

Is that the phase of the compensator or the phase of the edge diffraction?
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Old 8th November 2006, 11:31 AM   #10
rabbitz is offline rabbitz  Australia
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Ah.... I see. PI space it is and no baffle step for sure.

Close proximity to the corner I'm sure will give some strange boundry effects with boosts (up to 150Hz?) and suckouts (331Hz?).... thinking aloud
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