Hi again David. David Rowe wrote: > Hi Brian, > > Apologies for taking so long to reply, I have had my head down working > on the fdmdv2 GUI program with Dave Witten, which we hope to release > before the end of this year. > > Brian, I listened to the samples and I do think there is some > improvements on some samples. I'd agree with you that the samples sound > more natural on average. Nice work ! > > Some comments: > > 1/ Many of the samples sound less clicky or buzzy, more natural. > > 2/ However the level of many samples has shifted down, they > sound quieter > > This is mostly because there is a divide-by-8 done on the energy to offset the power increase, which is probably too aggressive. It is easily fixed, using a divide-by-4 or something else instead.
> 3/ Also some of the samples sound more band-limited, this might > affect intelligibility, not sure. morig is a good example of > this, sounds like some HF filtering. The power law might be > doing this, enhancing higher amplitude LF sounds more while > attenuating lower energy HF energy. > > Keeping the full set of FFT bins and only doing the powf thing seems to help with this. I can post some more samples with only the powf change for more comparisons if you want. Another idea is to narrow the range of FFT samples down to just a single FFT bin instead of 3, or even just sample the filter at precisely the harmonic frequency. (I'm just throwing some ideas around really, seeing what helps) > 4/ the background noise on mmt1 was noticeably reduced. Maybe > this is positive effect of (3), i.e. annoying HF noise has been > attenuated, which in this case dominates the sample, so we don't > miss the HF speech energy. > > It would be good if we can keep (1) & (4), but improve on (2) and (3). > -- Brian Smith. "The bells of clocktowers stitch the sleeper's dreams together." - Memory Palace ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
