Subject: Re: echo in the freq. domain From: Danijel Domazet <Danijel.Domazet@xxxxxxxx> Date: Fri, 14 May 2010 11:13:24 +0200 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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 > >