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polo

sp1200 sound / emulation

Hi!

I've been experimenting with emulating the sound of the sp12 /1200 and I need some help with new sound examples.

Here is where I got so far:

These are the original samples (I took them from a project page from someone who made an emulation for a university project)
http://ccrma.stanford.edu/%7Enolting/220c/piano2.wav
and
http://ccrma.stanford.edu/%7Enolting/220c/kick1.wav

These are his sp1200 versions and the result of his emulation:
http://ccrma.stanford.edu/%7Enolting/220c/piano1_a.wav
http://ccrma.stanford.edu/%7Enolting/220c/piano1_b.wav
and
http://ccrma.stanford.edu/%7Enolting/220c/kick1_a.wav
http://ccrma.stanford.edu/%7Enolting/220c/kick1_b.wav

And here are my results so far:
http://drop.io/pwj0u8o

I would need need some examples with some original sounds and a pitched version of it.
Could you help me with this?
Drinks

Re: sp1200 sound / emulation

polo wrote:

I would need need some examples with some original sounds and a pitched version of it.
Could you help me with this?


Hmmm...

So that's what they get up to at Stanford! Wink

Its not difficult to replicate the word reduction 12-Bit.  The sample rate is around about 22kHz.  But what are you doing about the aliasing and the architecture of the DAC?  I think this is by far the most important aspect of the character of the sound.  Its not that it wasn't intended.  Its the design and what was around at the time.

What kind of data are you collecting, what kind of tests are you running and what are the benchmarks?  Also, what do you hope to achieve in getting someone to sample your sounds into their SP and back out again?  How will you measure the difference?  In terms of dynamic range or a measure of the aliasing?

Here is your suggested signal chain:

WAV > DAC (PC Interface or Sound Card) > [INSERT MIXER HERE, i know I use one!] > SP Sample In > SP OUT (which one?  3 sets of LP Filters) > ADC (PC Interface) DAW > RENDER or BOUNCE at 16-Bit, 44.1kHz [dithering anyone?] PCM WAV.

No.

For this you need the machine so you can test it yourself.  There are much to many variables.  If you are being commissioned to create an emulator, then you should consider purchasing an SP and charging under R&D.

I know I would Wink

drinks
DFACE DXA

Re: sp1200 sound / emulation

[quote="Drinks"]
polo wrote:
you should consider purchasing an SP and charging under R&D.
RHYTHM MONSTER

I think I can do a pretty good SP emulation with audacity and some EQ. Here's some examples:

First off, this is the original .wav file

Nautilus _original_.wav - 0.21MB

This is the above sample being played back in the SP-1200. I'm not sure how familiar you are with the aliasing of the SP so I wanted to show you that the aliasing changes depending on how you pitch it. The first 2 bars are not pitched, the second 2 are -8, the third 2 are -12 and the last 2 bars are -16. Every semi-tone aliases differently but these are common pitch changes.

Nautilus in the SP-1200 _Pitched 0_ 8_ 12 _ 16 Semitones_.wav - 1.68MB

This is the original version modified with audacity and eq to sound like an SP-1200.

Nautilus _emulated_.wav - 0.21MB

To put it in perspective here is the real 1200 -8 semi-tones vs the emulated version. The first 2 bars are the 1200 and the second 2 are the emulated version. Not exact but very similar.

Nautilus _Pitched 8 vs emulated_.wav - 0.84MB

I was going to write an audacity script to handle the emulation but you can't script with the extra plug-ins yet. All that software is free as in speech (and beer of course) so I suppose you could mess around and make a stand alone program that does it but it might not be worth your time. Hope that helps.

rhythmonster
polo

Re: sp1200 sound / emulation

Drinks wrote:
polo wrote:

I would need need some examples with some original sounds and a pitched version of it.
Could you help me with this?


Hmmm...

So that's what they get up to at Stanford! Wink

Its not difficult to replicate the word reduction 12-Bit.  The sample rate is around about 22kHz.  But what are you doing about the aliasing and the architecture of the DAC?  I think this is by far the most important aspect of the character of the sound.  Its not that it wasn't intended.  Its the design and what was around at the time.

What kind of data are you collecting, what kind of tests are you running and what are the benchmarks?  Also, what do you hope to achieve in getting someone to sample your sounds into their SP and back out again?  How will you measure the difference?  In terms of dynamic range or a measure of the aliasing?

Here is your suggested signal chain:

WAV > DAC (PC Interface or Sound Card) > [INSERT MIXER HERE, i know I use one!] > SP Sample In > SP OUT (which one?  3 sets of LP Filters) > ADC (PC Interface) DAW > RENDER or BOUNCE at 16-Bit, 44.1kHz [dithering anyone?] PCM WAV.

No.

For this you need the machine so you can test it yourself.  There are much to many variables.  If you are being commissioned to create an emulator, then you should consider purchasing an SP and charging under R&D.

I know I would Wink

drinks


I just need some examples to fine tune my algorithm, I do it by ear. I'm trying to model the no-filter-version of the sp.
I'm not commissioned by anyone, I got no cash to buy a sp, so I try to model myself one.
polo

RHYTHM MONSTER wrote:
I think I can do a pretty good SP emulation with audacity and some EQ. Here's some examples:

First off, this is the original .wav file

Nautilus _original_.wav - 0.21MB

This is the above sample being played back in the SP-1200. I'm not sure how familiar you are with the aliasing of the SP so I wanted to show you that the aliasing changes depending on how you pitch it. The first 2 bars are not pitched, the second 2 are -8, the third 2 are -12 and the last 2 bars are -16. Every semi-tone aliases differently but these are common pitch changes.

This are some good examples, thanks.
Drinks

Re: sp1200 sound / emulation

polo wrote:


I just need some examples to fine tune my algorithm, I do it by ear. I'm trying to model the no-filter-version of the sp.
I'm not commissioned by anyone, I got no cash to buy a sp, so I try to model myself one.


Sorry Polo.  Tough day at work Wink

I'll try and knock something up for you.  Any old sample good for you?

drinks
polo

Re: sp1200 sound / emulation

Drinks wrote:
polo wrote:


I just need some examples to fine tune my algorithm, I do it by ear. I'm trying to model the no-filter-version of the sp.
I'm not commissioned by anyone, I got no cash to buy a sp, so I try to model myself one.


Sorry Polo.  Tough day at work Wink

I'll try and knock something up for you.  Any old sample good for you?

drinks


Anything would be good, thanks very much!
Drinks

Ok!

Before weekend is up.  We have a holiday here on Monday. Wink

drinks
Drinks

OK Polo.

I just sampled a sine sweep over 2.5 seconds, the maximum allocated.  Its from 0-20kHz and there are varying pitches.  It was sampled and recorded through an Apogee Duet (known to colour the sound but accurate nonetheless).  I used Logic for its test oscillator and also for recording 24-Bit, 44.1kHz - just had 24-Bit checked but I could have/should have recorded at 16-Bit... oh and it's an .aif  Embarassed

The weakest link in terms of fidelity seems to be the SP.  At varying pitches, the sweep generates strange echo artefacts.

Sweep 0-20kHz P0_10.aif - 3.92MB

Either that or its this rose wine Wink.

Hope this helps.  Sorry I seemed negative before.  Would love to see something developped as an AU or VST?!

drinks

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