Re: That vinyl sound
> When you digitise, you lose information, based upon the sample rate.
Well to be exact, the sample rate dictates the band limit you can capture. In the case of 44,100Hz that is everything from nothing up to 22,050Hz.
Within that bandwidth, everything is fully reproducible. You lose nothing, no waveform of any kind.
Anything that IS lost, is above 22,050Hz, and is unwanted and would have very likely been filtered out anyway so as to no ADD distortion, which is known as aliasing, because there is a chance that one of your sample points will fall onto part of a waveform above 22,050Hz, but as it is beyond your band linit, you only have part of that waveform, thus trying to reproduce it adds aliasing.
Thus you filter it out. Well actually, we dont...
What we do is record at a HIGHER sample rate that what is needed. Thus we can capture the junk above 22,050Hz with NO NEED to filter any of that out at all. We edit at this higher sample rate also, any noise and junk we add due to that editing again, gets pushed beyond 22,050, like sweeping crap under the carpet. Sampling high really does make that capturing and editing process so easier to deal with the noise. Then when we are ready, we downsample to 44,100Hz.
This literally sends the crap above 22,050Hz into the void. Giving us a nice small file (our master is at 192kHz and is much bigger) and perfect reproduction of ANY WAVEFORM that existed at the time of recording, but not higher than 22,050Hz. Nothing is lost apart from what we dont want, and cant even hear. Nothing.
In fact, we do it when playing back too.
CD players, when they say 6x Oversampling, well that isnt just a "wank feature" but a very good way of playing back the waveform. The 44,100Hz samples are upsampled to 6x 44,100, resulting in a sample rate of 264.6kHz.
Now, sure there is nothing in there. Above 22,050, there is nothing, because we already dumped that crap, but the CD player now can deal with the noise that it adds during conversion. The D-A converter and filtering stages can now be designed to filter out any noise added by the CD player itself using much simpler and gentler filters.
An old CD player that does not oversample will have a harder filter at 22,050Hz which is harder to make and more expensive.
So: Nothing at all is lost that we want. Nothing. Everything that is lost, was not wanted in the first place.
> Can you prove information isn't lost?
Yes, we can. In fact you can see it on youtube. You can do it yourself. In a band limited signal, nothing is lost when converting to digital samples and back again. Nothing. Each sample is like a dot in a connect the dots picture, the dots make the picture, they can only make that picture. The only solution, is the exact original signal that was recorded.
"Perfect audio forever" is not just a tagline. This technology nailed digital audio in the 19 bloody 80's. No matter how may audiofools want to think otherwise.