Linear vs Minimum Phase filters in REW for miniDSP - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 45 Old 06-19-16, 06:05 PM Thread Starter
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Linear vs Minimum Phase filters in REW for miniDSP

Hi, Recently miniDSP announced the miniDSP2x4HD. This contains FIR and IIR filters. Which means that it makes minimum phase and linear phase happen.
On the other hand the EQ generation facility of REW assumes minimum phase only. Does this idea correct? Or REW provides (or will provide) linear phase EQ too? like Dirac's mixed phase.
Yuichi Arai
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post #2 of 45 Old 06-21-16, 01:46 PM
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Re: Linear vs Minimum Phase filters in REW for miniDSP

REW will provide only minimum phase filter settings. An impulse can be generated for IIR filter application, but it will only contain minimum phase filter info.
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post #3 of 45 Old 06-21-16, 05:32 PM Thread Starter
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Re: Linear vs Minimum Phase filters in REW for miniDSP

Thanks, Yuichi
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post #4 of 45 Old 06-27-16, 02:08 PM
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Re: Linear vs Minimum Phase filters in REW for miniDSP

There are multiple tools available, some freeware, some for $$, some simple, some very complex, for generating FIR impulse that can be used with the 2x4 HD

miniDSP provides explanations and links to many of them on their FIR FILTER TOOLS PAGE.
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post #5 of 45 Old 06-27-16, 07:27 PM Thread Starter
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Re: Linear vs Minimum Phase filters in REW for miniDSP

Thanks again. I will take a look the URL and find out easier one. Yuichi
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post #6 of 45 Old 06-30-16, 06:08 AM
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Re: Linear vs Minimum Phase filters in REW for miniDSP

Look at rePhase or Align2 for ease of use.
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post #7 of 45 Old 06-30-16, 09:17 PM Thread Starter
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Re: Linear vs Minimum Phase filters in REW for miniDSP

Thanks Wayne start to look rePhase. Yuichi
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post #8 of 45 Old 08-04-16, 12:04 AM Thread Starter
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Re: Linear vs Minimum Phase filters in REW for miniDSP

Quote:
AraiYuichi wrote: View Post
Thanks Wayne start to look rePhase. Yuichi
One question about REW and rePhase relations.
Assumption is the EQ generation of speaker sound property.

In REW, minimum phase EQ is generated after compensation of time delay (sound travel time).
To generate FIR filter EQ (Linear phase) , measured data has to be exported from REW to rePhase. Exported REW data has time delay, therefore, phase graph is out of scale in rePhase screen. So, is there any way to generate minimum phase in rePhase or any other way to generate linear phase EQ on rePhase?
rePhase works good for very small delay(phase) contained in the data. Does this mean that it is not a good way to use this combination to generate for the speaker sound EQ?

Yuichi
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post #9 of 45 Old 08-04-16, 04:20 PM
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Re: Linear vs Minimum Phase filters in REW for miniDSP

If I am not mistaken, the time delay is to be removed before filter generation. jtalden is by far the expert around here in that area.
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post #10 of 45 Old 08-04-16, 05:48 PM Thread Starter
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Re: Linear vs Minimum Phase filters in REW for miniDSP

I think so. Therefore, IIR filter is properly generated by REW. But to generate FIR filter for miniDSP2x4 HD, it is recommended to use rePhase. Where, measured data which is obtained by REW is exported to rePhase as original. Which means that phase information contains delay time. This means that the phase curve on rePhase screen changes so sharply. So, I can not adjust phase to linear on rePhase. Does this mean that this method (REW->rePhase) is not applicable speaker measurement and EQ generation because of large delay (sound travel from the speaker to the mic)?

Or simply saying, how to generate FIR (Linear phase) filter for speaker sound?

Yuichi
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