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Old 01 March 2003, 13:38   #1
Paul
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Interpolation new Sound options

What does RH and Crux stand for?

What is the difference?

Thanks
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Old 01 March 2003, 14:33   #2
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Crux is Berndt Schmidts old handle. RH stands for Richard Hoffmann, who wrote the other interpolation code

Last edited by Lockrobster; 01 March 2003 at 14:54.
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Old 01 March 2003, 14:50   #3
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Oh I see. Thanks for the info
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Old 01 March 2003, 15:49   #4
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I have updated the guide now
http://guide.abime.net/wb3.1/chap1.htm

Last edited by Paul; 14 August 2006 at 18:52.
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Old 01 March 2003, 17:21   #5
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I checked an old post and found this explanation of the interpolation options. Their purpose as I understand it is to smooth out distortion that happens because UAE produces sound at a fixed samplerate (ie. 48kHz = 48.000 samplepoints per second), while Amiga Paula running at 7Mhz and continously producing samples has like 7 million samplepoints per second. This produces a slightly uneven distribution of Paula samples in the output, audible as unwanted frequencies = noise.

Now the RH method works by making an average between two neighbouring samples and this way turns the 'square' UAE waveform into a triangle wave. This method filters some noise but sometimes sounds a bit more muffled.

Bernds method seems to work a bit like antialiasing applied to the 'square' waveforms of UAE. It inserts a certain amount of averaged samples between the square 'steps' of the waveform to give more sliding volume changes.

Please don't take this info as authoritative, it's an abstraction from the only bit of info I ever saw on the subject.
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Old 01 March 2003, 22:35   #6
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Heh, I always wondered what the whole "Interpolation" thing was about.
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Old 02 March 2003, 11:06   #7
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interpolation

I also wondered about interpolation differences.
I guess that RH is LINEAR interpolation and CRUX is CUBIC interpolation.
Crux gives better results so I don't know why there are two method of interpolation.
Just delete the RH option in WinUAE.
 
Old 13 August 2006, 16:29   #8
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An old thread but, what is Anti or Sinc?

In WinUAE 1.3, which one of the four should I say is best to use on my guides?

OK in XMPlay (audio player) I use Sinc as this gives me better sound, going via http://support.xmplay.com/article.php?id=14

Quote:
Interpolation

Linear - 2 point interpolation Linear
Sinc - 8 point interpolation Sinc

Linear 2 point interpolation "draws" a straight line between the samples, Sinc 8 point interpolation "draws" a smooth curve between the samples and requires more CPU power (Supports 3DNow! Technology.).

Linear interpolation gives decent sound quality with minimal cpu usage.
Sinc interpolation has, as a result of its complexity, far higher sound quality, with the price of higher cpu usage.
Also is the above post right?
Quote:
RH is LINEAR interpolation and CRUX is CUBIC interpolation
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Old 14 August 2006, 17:12   #9
Toni Wilen
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http://board.kohina.net/viewtopic.php?t=894
http://board.kohina.net/viewtopic.php?t=850

Anti is enabled by default in WinUAE since 1.3 (or was it 1.2..). It is very fast and should have good quality. Sinc is better but needs much more CPU power (but it also has free "led" filter emulation)

(It probably needs very special sample/sound pitch and/or frequency to hear the difference..)
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Old 16 August 2006, 00:34   #10
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Would be useful to have some of this in WinUAE.

RH - Good
Crux - Better
Anti - Even Better
Sinc - Best

Not sure though if this is really correct.
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Old 17 March 2019, 20:57   #11
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It would be nice if this info would be included in the WinUAE helpfile.
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