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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: Indeed They Don't..... posted by Todd Krieger on March 2, 2007 at 05:09:50:
*** Because in the 16-bit case (unlike the 20-bit case), the quantization increment is now bigger than the ambient noise floor, hence applying additional dither noise becomes essential. ***Not necessarily. Have you ever shot a picture in high ISO, long exposure? Lots of color noise.
*** Don't presume it's been dithered. ***
If you are using a sigma delta ADC (99% of ADCs these days) the decimation process is inherently self-dithering. That's what I said, which you yourself quoted: "(because they signal has already been dithered by the decimation process in the ADC)".
*** Dither is only required if any resolution or information, which correlates to the original signal or desired processing effects, would otherwise be lost with non-dithered truncation. ***
Post-processing can generate additional quantization noise, which can be audible.
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- Re: Indeed They Don't..... - Christine Tham 14:36:16 03/02/07 (0)
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