[sdiy] IR Reverb

Mikko Helin maohelin at gmail.com
Wed Feb 21 07:37:39 CET 2018


Regarding the IR formats they are usually time domain .WAV files.

I think the real world low-latency implementantions of IR reverbs or
convolution in general are hybrids - convolution for the initial partition
of IR uses time domain FIR and the rest of it FFT.

On Wed, Feb 21, 2018 at 4:27 AM, <rsdio at audiobanshee.com> wrote:

> Oops, I’ve already lost the response from this thread where someone
> recommended getting your feet wet on the desktop.
>
> That’s good advice.
>
> Nearly all of this DSP stuff comes down to the same building blocks. I’ve
> ported plugins from Intel’s x86-specific DSP library to Apple’s
> processor-independent macOS DSP library  and they all have the same blocks.
> The TMS320 code that I worked on was original, not ported from existing
> code, but it also basically used the same blocks. The CMSIS-DSP library has
> the same blocks, although they won’t quite be the fastest.
>
> So, the easiest way to learn all of this math is to build something on the
> desktop - maybe with CoreAudio - so that you understand all of the pieces.
> Once you have this code running and producing sound, you can then start
> looking at the hardware platform design. You’ll know from your desktop code
> what FFT sizes you’re happy with. If the embedded DSP options lean towards
> a different FFT size for any reason, you can tweak your desktop code to
> mimic the exact same operations. Then you can spec out the various DSP chip
> options by looking at benchmarks. I selected the TMS320VC5506 after I knew
> the exact FFT size, sample rate, number of channels, and desired update
> rate. Then I could select chips that met those requirements while also
> meeting the dollar cost and USB power consumption limitations of the
> project.
>
> Having some working desktop DSP code will really help you get your mind
> around what your hardware design will need to be. The vendor for the DSP
> chip that you end up selecting will surely have libraries available for
> their chips that provide exactly the same building blocks that you need.
> You’ll just know more about what to look for after you’ve written the code
> on the desktop.
>
> Wish I hadn’t lost that email response, because I’d like to give credit to
> the person who first suggested this approach in this thread.
>
> Brian
>
>
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