virus TI internal specs
 

I've contacted Access concerning the internal specs. On one hand, the support assistant told me that the internal bit resolution is 56bits, but on the other hand, he didn't want to tell me the internal sampling rate...

To me 56bits is stunning, so that might be the reason why he told me this. Is the sampling rate exaxt the opposite? 40'000 (there should be some aliasing in the higher notes according to some reviewers, I had no chance yet to have a look/an ear to it, there's no single virus available in the shops at the moment)?

So its internal resolution is 56bits and it outputs 24/192 through the analog outs. That sounds good!

DS

I think the "192Khz DAC" jst refers to the specification of the DAC part and says nothing of the actual sample rate it is run at.

The internal processing rate may also have nothing to do with the rate at which the DAC is fed (just to add to the fun) because the DAC feed rate *appears* to be tied to the USB sample rate - ie 44.1 or 48, or mabe some multiple (88.2/96 etc).

All the previous virus models have worked at 44.1 or 48kHz. And if the TI's usb connection works at that rate I guess they still use it. And Access is known of programming efficient code (the B-series for example had the reverb later and more polyphony if I remember right) and not use too much dsp power so running things at 96kHz is not their style, I guess. :wink:

How do you want to know that since Access don't give any informations?

Is there a tech expert who knows Motorola processors? What sampling rate does the 56bit processor model *support*?

If you mean, how do I know? I got an answer for this from access support a few moths ago when I was asking the sampling rate of the virus ti.

Yes, that's actually what I mean. In German, you ask it that way I've done first.

the internal SR must even be bader than 44kHz, there's an immense aliasing on the upper notes... horrible

Correct me if I'm wrong but isn't it related to the fact that this is a VA and the OSC waveform arent multisampled accross the whole range?

I don't think the internal samplerate would be less than 44.1 but my guess would be that it is 48 since for some reason my TI(im not alone) ALWAYS resets to that samplerate.

area they sampled at all? I hope not

yea tk from access said its internal rate is 24/48 -depending on if your working 44 or 48

sounds gorgeous to my ears!

The 56 bits size is only available as a special accumulator register on the motorola dsp series they are using.. it makes sure no bits are lost during long calculations. After the calculation some bits will have to be striped away again to fit the result in a normal register.. which is 24 bits.

Contrast this to 32bit math on pc which uses 64bit or even 80 bit accumulators inside the cpu.. 56 is nothing to go wild about ;-)

on the samplerate:

44/48 is probably right for -some- parts of the synth, but it wouldnt surprise me if some parts (like the filters) are oversampled to 88/96 to keep the resonance stable at the high end.

funny, oversampled filters but horrible aliasing on higher notes... that doesn't make any sense

im just not hearing anything horrible out of the TI.
some instruments actually use alaising as a defining point...microwave xt

the TI is at the top of the food chain in VA.
it sounds just as good and better then the previous viri..

dr. orange: I understand what you mean regarding aliasing but most VA and vsts have the same issues(especially Z3TA+).

Virus might be far from the best in the high range but still an awesome all around synth. Great in many areas but not the best in every type of sound.

oversampling just the filter has a lot less impact on cpu than oversampling 16 oscillators... but it has a lot more impact on soundquality in the normal playing range.

I just checked the basic osc.. it indeed does produce quite a bit of aliasing... (*frowns at access* There is no need for aliasing like this anymore!)

but.. until we see the code responsible for the sound, its all guesswork..
I was just making some observations to illustrate "samplerate" and "bitdepth" not having to be uniform across a synth.

DEAR PALS!!!

despite the horrible horrible aliasing which indeed is very horrible and a pain in the ass having it at a synth like the virus, I just have preordered it!

LOL :twisted:

Thanks Zephod!
Your posts were quite informative :)

Do you mean that aliasing might be related to the fact that the TI doesn't have enough CPU to render the osc at higher samplerate?

What about Hypersaw. Is this aliasing free?

Dr. orange: Wow I'm actually surprised :) Have fun tweaking your virus!(ti?)

yeah.. the cpu (I guess the DSP can be called central enough in this box?) might be a limiting factor here.. or memory. A common strategy to prevent aliasing is to store pre-bandlimited wavetables for every octave and then oversample 2x. Or store a new wavetable for every harmonic that drops from the sound.

I'll have to check the hypersaw later tonight. Its probably harder to see the aliasing with the dense spectrum caused by the detune, but I'll see what I can do.

Hehehe, classic! :D

After the shit you have dribbled on this forum against Access,
don't be surprised if they build a special unit just for you.

A quote...

Nice to see you're helping out Access with the alphatesting.

Wanker.

no problem