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life.exeMPLAR

Member
Joined
Feb 25, 2021
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Hi, I feel like I don't quite get noise in analog-to-digital

1) why can't we record music at for example 17 bits, the quantized noise is last bit, right? And then we cut the last bit so no quantized noise???

2) why can't we oversample > noise shape > downsample to get rid of noise
The noise is just there and we can't remove it?

3) Why oversampling in delta sigma dac is necessary in order to achieve high signal to noise ratio. I get the formula but I don't intuitively see why we are able to get so high signal to noise with just increasing the bandwidth.

As always thanks for explanations
 

thulle

Active Member
Joined
Aug 31, 2021
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It's a bit like writing 1/3 as a decimal number, you can write it as 0,333... with 16x 3's, adding a 17th 3 gets it a little more accurate, but you can never get it exactly right regardless of how many 3's you add, the remaining error is your noise.
 
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