On Mon, Jun 13, 2005 at 04:08:47PM +0200, Prakash Punnoor wrote:
But what do you want to tell me? You are right or me? I am not an audio expert, but if I may quote following, I think it rather backs me up, as AFAIk noise shaping is a form of dithering, too. I understand:
96kHz, 20 bit pcm ~ SACD ~ 96kHz, 16 bit pcm w/ noise shaping
IMHO you do not get bak the exact original shape/wave form regardless how good the dithering is. What you can do is IMHO a mostly perfect guessing how it may look like at recording time and before quantization. This is somewhat of a higher art of fitting.
So dithering does help to reduce noise levels. Or did I completely misunderstand anything?
It helps to get the signal noise ratio as low as possible to avoid the requantization noise.
I am not suggesting to add dither later to a signal, but if you have a 20bit source and dither down to 16bit, you will have a better signal than 16 bit truncated/rounded - which was my original claim.
Hmmm ... IMHO the problem is: You may restore at most the original wave form, nevertheless you are never sure that you find the correct one without the ``forgotten'' information.
Werner