Subject: Re: psychoacoustically driven temporal approximation From: Joachim Thiemann <joachim.thiemann@xxxxxxxx> Date: Wed, 5 Mar 2014 11:01:07 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Hello Alberto, I'm not entirely sure, but this sounds a bit like my thoughts when I started my Ph.D. many years ago: can I synthesize an audio waveform from a perceptual representation of another audio signal? (and what does that imply about that particular perceptual representation?) My answer was to so by iterative resynthesis: make a first good guess of the inverse perceptual transform, then correct for the error. Key point is that the correction needs to go in the right direction. My perceptual transform was a set of sparsely sampled hilbert envelopes of the outputs of a gammatone filterbank. If you want you can have a look at my thesis "A Sparse Auditory Envelope Representation with Iterative Reconstruction for Audio Coding", linked from my homepage (http://jthiem.bitbucket.org/research.html), you can find the MATLAB code on that page too. Of course, in my thesis I refer to work that others have done in a similar vein. Cheers, Joachim. On 4 March 2014 12:05, JesterN Alberto Novello <jestern77@xxxxxxxx> wrote: > Hi all, > i'm trying to find a way to approximate the sample values of an audio > waveform in time domain. > I want a method that takes care of approximating perceptually-relevant audio > bands better than others. > Basically a spectral-weighted temporal approximation method. > In my head it's not clear how to connect frequency components to specific > samples in the time domain. > Any DSP wizard out there with a good idea/papers ? > Best regards > Alberto > -- Joachim Thiemann :: http://jthiem.bitbucket.org :: http://signalsprocessed.blogspot.co