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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: A lot of people don't understand dither posted by Christine Tham on March 1, 2007 at 14:03:41:
"The best analogy I can think of is taking a 24-bit picture and truncating the colors down to 16-bit" CUT!!!!!When it comes to applying dither, truncating to 16 bits is a big difference from truncating to 20 bits. It's a totally different ballgame. 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.
"Check out the izotope white paper on dither, which explains this is more detail."
It's an interesting paper, in terms of graphic explanation.
It doesn't really back up the notion that adding noise to truncate 24-bit to 20-bit is necessary.
"Dither is not necessary if you are not processing the original signal in any way (because they signal has already been dithered by the decimation process in the ADC)."
Don't presume it's been dithered. The vast majority of recordings are dither-encoded, but not all recordings.
Besides, in the 24-bit case, if it's then truncated to 20, the 20-bit signal is not the original, but taking that non-original 20 and then truncating it to 16, you definitely need dither in order to minimize the losses from truncation.
"However, dithering is required whenever you do any processing on the signal, even if you maintain bit depth. It's because processing can introduce additional quantization noise which needs to be dithered."
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.
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Follow Ups
- Indeed They Don't..... - Todd Krieger 05:09:50 03/02/07 (3)
- Re: Indeed They Don't..... - Christine Tham 14:36:16 03/02/07 (0)
- How About Remastered Recordings? - Robertc88 08:04:22 03/02/07 (1)
- Re: How About Remastered Recordings? - Todd Krieger 13:09:21 03/03/07 (0)
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