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Re: Finally some rational arguments

It's a little bit more than just imperfect filters and quantization error. If you model jitter as well, then for situations where you only have 2-3 samples per period (and a rapidly changing signal in terms of frequency and amplitude), you get a "perfect storm" scenario where the error ends up being exponentially large.

I must admit the results surprised me greatly, but I was able to confirm by empirical observations based on actual outputs from a physical DAC.

It certainly explains why people hear CD high frequencies as "wrong" when the theory says the quantization error should be insignificant. And the fact that the error is significant down to fs/4 is also interesting. If there are huge reconstruction errors at 20kHz, I would probably say "so what? very few people can hear that". But significant reconstruction errors at 10kHz will be audible, and clearly is audible to a lot of people. It also confirms why even tiny amounts of jitter are so audible, and why jitter reduction strategies can be so beneficial in DAC implementations.

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