Hi-Rez Highway

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Re: keep us posted on your listening experience

Posted by theaudiohobby on October 31, 2005 at 09:24:21:
"Well Upsampling takes the signal from 44'1 to 98, 198, 398, 598, 798 or whatever rate higher than the 44.1Kz. If the cd was mastered and there is digital noise up in higher bandwith, then upsampling would pick up this audio noise,"
It does not work like that at all, The Nyquist frequency is an effective ceiling and no data is captured above that frequency. Therefore the upsampling cannot pick up digital noise from non-existent data. The process of interpolation approximates new data points, but that approximation is based on initial data at the original sampling frequency, in this case 44.1. The filters used in the upsampling process may introduce problems of their own, but that is another matter entirely.

Music making the painting, recording it the photograph