I created FRD file using HOLMImpulse to use with Xsim. But something is not right. The created frd file doesn't work with Xsim. I am attaching file for reference.
Please let me know what was wrong.
Please let me know what was wrong.
Now I see something weird. Phase column has some huge numbers (it should be between -180 and 180).
I thought it is just off scale, because it's low volume.
I thought it is just off scale, because it's low volume.
Not necessarily. Unwrapped phase is valid and easier to handle because separate unwrapping logic is not required, though it should exist for response files with wrapped phase.
Hm, not really easier than.
We would really need strict specification of FRD. It's so simple, yet it requires "artificial intelligence" to parse all different variants.
BTW why do you need unwrapped phase?
@Aucosticraft are you sure it is not just off scale?
We would really need strict specification of FRD. It's so simple, yet it requires "artificial intelligence" to parse all different variants.
BTW why do you need unwrapped phase?
@Aucosticraft are you sure it is not just off scale?
Phase wrapping is decade easier than unwrapping, and unwrapping with simple logic becomes unreliable when excess delay (in phase response) is long enough compared to frequency resolution.
Unwrapped phase helps at least interpolation and extrapolation (re-scaling of frequency axis), smoothing and group delay calculation.
Wrapped phase (with decent or removed excess delay) is de facto standard in response files. Attached sample file HOLMImpulse.frd is raw result of FFT beginning at 0 Hz and therefore not so typical, small and fast as response file could be.
Unwrapped phase helps at least interpolation and extrapolation (re-scaling of frequency axis), smoothing and group delay calculation.
Wrapped phase (with decent or removed excess delay) is de facto standard in response files. Attached sample file HOLMImpulse.frd is raw result of FFT beginning at 0 Hz and therefore not so typical, small and fast as response file could be.
Seems to work (I had to change scale):
Thanks , That change of scale made it work.
It's working for me too.
When exporting FR as text from HOLM, I always add 99dB in the adjustment window before export. That brings the numbers up to a range suitable for XSim and Rephase. Remember to remove the 99dB boost in HOLM, or you'll be way off the scale. 😉
99.9dB is the max allowed, IIRC - so I simply use 99
99.9dB is the max allowed, IIRC - so I simply use 99
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