[LAU] [Rakarrack-users] multiplying signal by external synth

[Renato Budinich]

On Mon, Feb 21, 2011 at 5:32 AM, Ryan Billing <ryjobil at gmail.com> wrote:

> No, the preset used in the video was not in the banks.  I just started with
> "New", then added Vocoder from "Put order in your Rack" button.  Load one of
> the internal presets then tweak with things to get the levels correct for
> Aux level and other things.Usually output level needs to be increased quite
> a bit.
>

uh, I've would have sworned there was some distortion first in the effect
chain (to beef up the carrier I thought)... can't check the video right now


> 2 ways to reduce vocoder CPU usage :
> 1) Set number of bands to 16 or so (diction is less clear)
> 2) Use a Downsample setting of 22050 or less in vocoder from Preferences.
>

thanks, I'll certainly try that.


> This is part of the reason I hope to use the FFT in a new Vocoder mode.
> Probably the FFT could be used for signal analysis, then I could possibly
> apply it to 8 filter bands with adaptable frequency and resonance.
>
> The other thing I need to do is add a "Stereo" switch so it only processes
> the output in mono--- will cut CPU usage in half for the output filters,
> which is a big reduction ;)
>
>
> On Sun, Feb 20, 2011 at 2:09 PM, Renato <rennabh at gmail.com> wrote:
>
>> On Sun, 20 Feb 2011 13:45:50 -0900
>> Ryan Billing <ryjobil at gmail.com> wrote:
>>
>> > this is nearly what an FFT vocoder does, while a phase vocoder is
>> > more in line with this.
>> >
>> > You would window both signals, convolve via FFT, then iFFT to
>> > transform back to audio. Overlap and add...
>> >
>> > In my list of things to try is to do this exactly -- I think it would
>> > be a nice lower cpu alternative to the Vocoder, and it will be
>> > similar to the Vocoder with 256 or 512 bands.  Really good diction.
>> >
>> > The short answer is, yes this can be done, and yes it would be really
>> > interesting :)
>> >
>> >
>>
>> great :)
>>
>> today fiddled around first time with the vocoder and it was very
>> cpu hungry (~80% in rakarrack top right, ~30% in 'htop') and causing
>> lots of xruns - I wasn't on realtime kernel though so I'll give it
>> another try.
>>
>> also, is the preset you used in the vocoder youtube video in one of the
>> banks?
>>
>> cheers
>> renato
>>
>
>
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