On Mon, 23 Nov 2015 09:46:55 -0800 (PST) Len Ovens <len@xxxxxxxxxxxxx> wrote: > On Mon, 23 Nov 2015, jonetsu@xxxxxxxxxxxx wrote: > > > On Mon, 23 Nov 2015 17:00:47 +0000 > > Will Godfrey <willgodfrey@xxxxxxxxxxxxxxx> wrote: > >> Although it seems counter-intuitive that actually is quite wrong! > > Hmmmm. Not sure about intuition. A sine wave with 16 sampled points > > will end up like a linked list of edges. Saving that to file and > > resampling at 128 will only add points to the straight lines. It > > will not create curves as per the original. It cannot. How would > > it know it was a sine wave and not a guitar tone when it had to > > process basically what was a robotic tone ? > > Very simplified.... Filtering. Really, watch the video a xiph.org > before you say any more. They compare (on analog equipment) input and > output wave forms at 44.1k. I watched the video. I still remain with what I said, really. As a parallel, a picture - parallel also made in this video - if you take a very low resolution of the Mona Lisa it will not be possible to reconstruct the quality of the original. The information is not there. This is quite obvious with pictures. Same with sampling. Attached is a quick drawing to illustrate. It is coarse as there are very few sampling points, but the principle applies. The limit is the finesse of the source material. If there are extremely minute changes in the wave then the sampling must be done at an according rate if one wishes to preserve the original as much as possible. Parameters of interpolation can be applied, but how would you interpolate a 4-bit Mona Lisa to show the subtleties of Da Vinci's painting ? Now, I would like to know that in reality things are not like that and that high, true-to-orignal, quality can be made from low quality sources so I remain open to all comments and ideas.
Attachment:
samplingPoints.png
Description: PNG image
_______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
