Originally Posted by sivadselim
You can put the identical 16-bit, 44.1kHz .wavs from the CD onto a data DVD. But you'll never, ever be able to take a CD that's 16-bit, 44.1kHz and put the material onto a disc as 24-bit, 96kHz material. That would be impossible. Even if you did have a way to put it on a DVD @ 24-bit, 96kHz, the quality would still be that of a 16-bit, 44.1kHz CD.
You can't just magically get higher quality out of a CD than what you start with.
I don't agree with this. Every digital signal must be converted to analog signal (reconstructed). During this process there is digital filtering (to filter aliasing artifacts - noise). If you upsample 16-bit, 44.1 kHz source signal to for example 24-bit, 176,4 kHz, you don't get more resolution from source signal, but you "move" these noise artifacts to higher frequency, thus allowing better filtering.
So when reconstructing digital signal to analog, there is always noise in the process (the ideal filter doesn't exists - that's fact), so upsampling (or oversampling) will make better the conversion when speaking about noise.
For those who don't understand what I wrote here: by converting lower resolution signal to high resolution we don't get more information in signal, but we can convert it "clearly" (with less noise) to analog signal. That's all about the digital signals. Filters matters.