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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

Hmmm.

Interesting photos.

At this point, I'm interested and also skeptical.

I'd like to know how those waveforms were generated and captured. You should also be kind enough to share the specific DACs that were measured. The reason is that I would like to reproduce your experiments. Your last graph claims that the DAC uses an 8x minimum-phase FIR. I am not aware of any product on the market with that combination of features.

We don't own an arbitrary function generator. But that shouldn't be a problem, as a computer program could generate arbitrary waveforms and then be used to burn CD's as test discs.

If you have the WAV files, please e-mail them to me and I will burn a disc and we can use it to test the new MP players.

The thing to remember is that all FIR filters are not alike. So I don't think it's a fair statement to say that they are *all* fatally flawed.

The other thing to remember is that we chose the filters based on the result of listening tests. Those tests included listening to non-oversampling (filterless) designs.


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