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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Re: But Can't Make Him Drink.... posted by Werner on August 27, 2003 at 22:19:27:
"Yes. Which is exactly what happens at the end of a digital filter (Sony's had internal word lengths of 48 bits even in 1989) and possibly at each truncation process in a DS DAC."If the "48 bits" was from orignal analog signal captured in A/D to the high-resolution media, such dither *would* be beneficial, because the dither would be acting on *real* information from the original signal. (Although even at 24 bits, the noise is at such a low level and would be difficult to regulate. The noise in the surrounding electronics could actually be higher.)
But if the "48 bits" are created from *calculating* interpolation values (upsampling), the extra bits are *not* in the form of real information from the original signal, and truncation of such derived signals to 24 bits really does not really lose anything. Especially if the original signal had a resolution of 16 bits. (Interpolation provides filtering, it does not add resolution.) So dither does not really accomplish anything in any upconversion scenario.
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Follow Ups
- High Resolution Signal versus Upsampled Signal - Todd Krieger 08/27/0322:52:10 08/27/03 (3)
- Re: High Resolution Signal versus Upsampled Signal - Werner 23:02:15 08/27/03 (2)
- Think About It... - Todd Krieger 00:57:23 08/28/03 (1)
- Re: Think About It... - Werner 01:38:26 08/28/03 (0)
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