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Old 10 September 2017, 14:19   #1
Dr.Venom
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Question on audio settings: Should I use UAE "sinc" or OpenAL "4-point sync" or both?

Hi,

I've been tinkering a bit with some sound settings in the OpenAL Soft configuration menu.

In FS-UAE I can choose "sinc" for sound interpolation ("uae_sound_interpol = sinc"). But in the OpenAL configuration menu I can also choose "sinc" as resampler quality:
- 4-point sinc
- bandlimited sinc

See attached picture with the "4-point sinc" selected.

Now what setting should I choose: disable the "sinc" filter in UAE and enable 4-point sinc in OpenAL, or maybe the other way around?

Or should I enable both the "sinc" filter in UAE and enabled the 4-point sinc resampler in OpenAL?

I'm a bit confused at which stage these different filters / resamplers get applied, so hopefully someone can shed some light?
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Old 13 September 2017, 22:06   #2
FrodeSolheim
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Resampling is used when e.g. frequency does not match. So presumably, when FS-UAE already outputs what OpenAL wants (e.g. 48000 Hz or 44100 Hz), the OpenAl resampling setting do not have any effect.
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Old 13 September 2017, 22:07   #3
FrodeSolheim
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Disabling interpolation in FS-UAE will decrease audio quality since FS-UAE will always perform resampling to get a fixed audio output frequency.
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Old 14 September 2017, 09:22   #4
Dr.Venom
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Quote:
Originally Posted by FrodeSolheim View Post
Resampling is used when e.g. frequency does not match. So presumably, when FS-UAE already outputs what OpenAL wants (e.g. 48000 Hz or 44100 Hz), the OpenAl resampling setting do not have any effect.
Quote:
Originally Posted by FrodeSolheim View Post
Disabling interpolation in FS-UAE will decrease audio quality since FS-UAE will always perform resampling to get a fixed audio output frequency.
That makes sense, thanks for explaining.

Last edited by Dr.Venom; 14 September 2017 at 09:31.
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