nVidia CUDA GPU computing PC FIR

[KOON3876]

>Maiky: sorry, now I made my own GUI to control complicated command line programs.
This is small program by vb2005, about 1200 lines. I'm not sure copyright of this program.
attached shows main GUI and Calculated Frequency response.

I can drag/drop folders or single file to play list or conversion box, then convert / play / stop / prev / next. enough so far

[KOON3876]

I got a contact from nVidia and they told me which dll can be / to be included.
Then I posted zip binary package to my site.

Package has
FIR Parameter generator
GPU FIR Converter, 44.1/16 stereo wav to 8ch extended
Source codes
sample BAT file

requirement
XP32
CUDA capable GPU (8x00, 9x00) and driver
Microsoft VisualC++ 2005 redistributable runtime(many people already should have. or search Microsoft & download)

Optional
Exact Audio Copy : to rip CD to wave, without list / info chunk
Audacity : to look converted wave

How to play
easy: 7.1ch audio, and Microsoft Media (9 or later) / foobar
great: foobar / ASIO / Lynx AES16 board

How to recompile
Visual C++ 2005 (or you can try edit and recompile on Linux)
nVidia CUDA toolkit
nVidia CUDA SDK

I hope someone can find bugs in source code

[SunRa]

Hello Koon,

I was reading about cuda some days ago and it's kind of funny reading about your project now...

By far the most interesting solution in FIR/DSP domain. Congratulations!

[peufeu]

Interesting. I'm definitely bookmarking this. Keep up, man

8.5 G tap calculation / sec ? Nice.

What format are you using for the FIR ? 64 bit float ?

[KOON3876]

Hi
>SunRa
Maybe only one solution to get true FIR within acceptable money

Originally posted by peufeu
8.5 G tap calculation / sec ? Nice.
What format are you using for the FIR ? 64 bit float ?

8.5GTaps are just a "minimum required". GPU can do far more than that.

nVidia GPU accepts 32bit float, but I estimated before that it is enough for 16bit output. (insufficient for full 24bit accuracy)

[peufeu]

Hm. Even 32 bit fixed point is unsuitable for 24 bit audio... isn't it possible to use some 64 bit format ?

[KOON3876]

Next generation of ATI or nVidia GPU computing will support double precision format. it has 52 bits of numerics, so will be accurate enough for 24bit audio.
But it will be trading between performance.(maybe no problem practically? I hope)

In my opinion, 16bit - 24bit is below -100dB issue, more important is true FIR, linear phase, flat synthesized responce, with sharp -80dB filtering in 1/4 Octave, is now possible.
and 88.2kHz(or 176.4kHz) up-sampling will improve for high freqs.

I recommend you will look extended wave format playback and sending data to your DAC. it's convenient.

[KOON3876]

nVidia linked to my site,
http://www.nvidia.com/object/cuda_showcase.html

Other pages are highly academic..

[Cyan]

I think i'll use something like this when i'll get my new hifi system (in no less than 5 years /cry...).
Do you think by that time the video card will be able to interface with the audio card? That is, i use the video card as crossover, but i link the amplifier directly to my audio card.

[KOON3876]

Hi, please see my other thread,
8 channel LPCM over HDMI, It's Multi Amp for Everyone