Re: echo in the freq. domain

[Danijel Domazet <Danijel.Domazet@xxxxxxxxxxxxxxxx>]

Hi Dan,
I am trying this in the frequency domain because I have a freq domain 
"framework" ready:
time in > hop size shift > window > dft > SOMETHING > idft > window 
>overlapp add > time out

I wanted to use this setup to try ANY kind of effect I can just by 
manipulating with the spectrum bins or whole dft frames. It was pretty 
easy to get a decent reverb. I also just did simple echo: saved quarter 
a second worth of dft frames and then added them back (attenuated) to 
current frames... and voila, not bad echooo choo oo o!


Regards,

Danijel Domazet
/CEO/
www.LittleEndian.com


On 13.5.2010 0:02, Dan Stowell wrote:
> Hi -
>
> You can do an echo (delay) effect in the frequency domain using 
> convolution, exactly the same as you would for reverb - you would just 
> use a different impulse response (a sparser one, typically, in the 
> time domain).
>
> However, the sparsity means that you can typically implement it 
> efficiently enough in the time domain, so there's not much point doing 
> it frequency-domain. Why do you want to do it?
>
> Best
> Dan
>
>
> Danijel Domazet wrote:
> > Hi auditory,
> > I'd like to do a simple Echo effect in the frequency domain. Does 
> > anyone remember any paper on the subject? There is a nice paper on 
> > freq domain reverberation ("Frequency Domain Artificial Reverberation 
> > using Spectral Magnitude Decay", Vickers E.), but couldn't find any 
> > on the echo....
> >
> > Thanks,
> >
> > Danijel Domazet
> > CEO
> > LittleEndian.com