KVR Audio

bengeorge · Post by **bengeorge** » Fri Feb 02, 2007 4:13 am

please for the telling: what is waveshaper symmetry? how does infect the sound? ok.

aciddose · Post by **aciddose** » Fri Feb 02, 2007 4:16 am

it infects the sound with leet analog juicyness.

actually it doesnt really do anything at the moment. it just adds a dc offset to the waveform before passing into the waveshaper, resulting in asymetric saturation. the function i'm using for waveshaping now (n(2-abs(n))) doesnt work well with this though.

aciddose · Post by **aciddose** » Fri Feb 02, 2007 5:46 am

http://xhip.cjb.net/xhip/releases/v0/b6 ... .11.11.dll

i changed the waveshaper, this seems to work better. the symmetry control responds more or less correctly now too.

bengeorge · Post by **bengeorge** » Fri Feb 02, 2007 6:30 am

i once read a technical treatise on audio that stated that one should "watch out for asymmetrical waves, cause it will eff up your speakers real bad, till they maybe bleed, even."

is this true of your asymmetrically saturated waves? will they, in fact, potentially eff my speakers? i think the idea was that, because they were asymmetrical, they are pulling/pushing the speakers much harder than is acoustically evident.

aciddose · Post by **aciddose** » Fri Feb 02, 2007 8:18 am

it is extremely rare to find waveforms which are symmetric. ramps (saws) are asymmetric. anything with even harmonics is asymmetric. what the symmetry control allows you to do is to adjust the balance of odd/even harmonics generated. if you pass a sine through the waveshapper and adjust the depth/symmetry, you'll see what effects these controls have on the harmonics generated. with a sine, adjusting the symmetry will be simmilar to adjusting the pulsewidth on a pulse waveform.

bengeorge · Post by **bengeorge** » Fri Feb 02, 2007 7:39 pm

oh... i see. because the wave form is a small cycle, the asymmetry doesn't matter. i think what i was referring to was when you can see over a long period of time (1+ sec) that the wave stays above or below zero.

aciddose · Post by **aciddose** » Fri Feb 02, 2007 7:53 pm

hm, yes using a dc input to your speakers is generally bad. the soundcard's output (and probably also your amplifier) should have dc blocking capacitors on the input/output though. when i apply dc to my amp/speakers for example, it seems to have a 20hz highpass applied somewhere.

gsoto · Post by **gsoto** » Sat Feb 03, 2007 12:58 am

I just wanted to say that I'm interested in ANY opinion/suggestion/critique/whatever regarding the GUI. So please don't hesitate to express yourselves.
If possible, try to avoid the stupid discussions too.

Now, back to studying some fine GUI references...

sweet_trip · Post by **sweet_trip** » Sat Feb 03, 2007 1:13 am

gsoto wrote:I just wanted to say that I'm interested in ANY opinion/suggestion/critique/whatever regarding the GUI. So please don't hesitate to express yourselves.
If possible, try to avoid the stupid discussions too.

Now, back to studying some fine GUI references

yeah...ok, can you change the font to Symbols?...

aciddose · Post by **aciddose** » Sat Feb 03, 2007 3:24 am

gsoto, you have no idea how you have made my heart beat with such vigour, as if new life has suddenly been brought to it. i think i am in love! http://xhip.cjb.net/temp/public/nice_gui.jpg

ok, now i will just need to find a suitable board to pound you with...

http://xhip.cjb.net/temp/public/yogart.mp3

mistertoast · Post by **mistertoast** » Sat Feb 03, 2007 3:30 am

aciddose wrote:hm, yes using a dc input to your speakers is generally bad. the soundcard's output (and probably also your amplifier) should have dc blocking capacitors on the input/output though. when i apply dc to my amp/speakers for example, it seems to have a 20hz highpass applied somewhere.

Interesting. I've been wondering about this because it's relatively easy to create a DC bias in my synth in a couple different ways. I was worried that I might have to handle the DC bias before it escaped my synth. I wasn't sure if it's something that each VST and VSTi should take care of, the host should take care of, or the hardware should take care of.

aciddose · Post by **aciddose** » Sat Feb 03, 2007 3:45 am

"I might have to handle the DC bias before it escaped my synth"

do not worry, just do it. there is an option in xhip. just add something like this to the end of your processing stage:

Code: Select all

  long n = samples + 1;
  float r = 1.0 - exp(-(2*pi) * hz / rate);
  float b, *p;
  p = left;
  b = highpass_buffer+channel; //need one for each channel
  b += 1e-18;  b -= 1e-18; //denormal elimination
  while (--n)
  {
   *p -= b;
   b += *p * r;
   p++;
  }
  *low = b;
}

this keeps everything in registers, you can even use sse for this of course.. although then your channels would have to be interlaced. based upon the cpu requirement, it isnt going to make a difference anyway.

mistertoast · Post by **mistertoast** » Sat Feb 03, 2007 5:02 am

Thanks. When you say it's an option in xhip, do you mean you have a UI element for letting the user decide if they want to eliminate DC bias?

gsoto · Post by **gsoto** » Sat Feb 03, 2007 5:49 am

sweet_trip wrote:yeah...ok, can you change the font to Symbols?...

Oh, I was thinking in Comic Sans but you got a point there.

aciddose wrote:gsoto, you have no idea how you have made my heart beat with such vigour, as if new life has suddenly been brought to it. i think i am in love! http://xhip.cjb.net/temp/public/nice_gui.jpg

aciddose wrote:http://xhip.cjb.net/temp/public/yogart.mp3

Delightful, reminds me of Brahms with some Tchaikovsky influences.

mistertoast wrote:Thanks. When you say it's an option in xhip, do you mean you have a UI element for letting the user decide if they want to eliminate DC bias?

I belive it's the "remove dc" checkbox in the Control page.

bengeorge · Post by **bengeorge** » Sat Feb 03, 2007 6:56 am

gsoto, that nice_gui was truly the nicest gui i have ever seen. is there any way of improving it? maybe not. but maybe yes!!!1

we pwn this city! we pwn this city on pwn and pwn!!

XHip--Please finish your synth!!