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ToggleIntroductionThe Sinc FunctionUsing the Sinc Function
Introduction
This elaborates some of the claims in my insights article on digital audio.
The Sinc Function
The first link in my insights article has a section on filters, but I will detail the most critical case. The bit depth is assumed to be so large for all practical purposes that it is infinite, and all calculations are done at that resolution. To clarify the statement above, we will start with two times upsampling and how it is done. You put the...

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