Interpolation new Sound options

Paul · 01 March 2003, 13:38

What does RH and Crux stand for?

What is the difference?

Thanks

Lockrobster · 01 March 2003, 14:33

Crux is Berndt Schmidts old handle. RH stands for Richard Hoffmann, who wrote the other interpolation code

Paul · 01 March 2003, 14:50

Oh I see. Thanks for the info

Paul · 01 March 2003, 15:49

I have updated the guide now
http://guide.abime.net/wb3.1/chap1.htm

Lockrobster · 01 March 2003, 17:21

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.

MethodGit · 01 March 2003, 22:35

Heh, I always wondered what the whole "Interpolation" thing was about.

02 March 2003, 11:06

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.

Paul · 13 August 2006, 16:29

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

Toni Wilen · 14 August 2006, 17:12

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..)

NoX1911 · 16 August 2006, 00:34

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.

bladecgn · 17 March 2019, 20:57

It would be nice if this info would be included in the WinUAE helpfile.

01 March 2003, 13:38	#1
Paul RIP Friends Join Date: Sep 2005 Location: UK Posts: 2,157	Interpolation new Sound options What does RH and Crux stand for? What is the difference? Thanks

01 March 2003, 14:33	#2
Lockrobster Junior Member Join Date: Jan 2003 Location: Old Europe Posts: 22	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.

01 March 2003, 15:49	#4
Paul RIP Friends Join Date: Sep 2005 Location: UK Posts: 2,157	I have updated the guide now http://guide.abime.net/wb3.1/chap1.htm Last edited by Paul; 14 August 2006 at 18:52.

02 March 2003, 11:06	#7
SwinkelS Posts: n/a	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.

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01 March 2003, 14:50	#3
Paul RIP Friends Join Date: Sep 2005 Location: UK Posts: 2,157	Oh I see. Thanks for the info

01 March 2003, 17:21	#5
Lockrobster Junior Member Join Date: Jan 2003 Location: Old Europe Posts: 22	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.

01 March 2003, 22:35	#6
MethodGit Junior Member Join Date: Dec 2002 Location: The Streets Age: 39 Posts: 2,731	Heh, I always wondered what the whole "Interpolation" thing was about.

14 August 2006, 17:12	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	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..)

16 August 2006, 00:34	#10
NoX1911 2064 Join Date: Jul 2005 Location: de Posts: 231	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.

17 March 2019, 20:57	#11
bladecgn Registered User Join Date: Nov 2013 Location: Essen / Germany Posts: 188	It would be nice if this info would be included in the WinUAE helpfile.

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