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RE: No revolutions

Does the very high sampling/oversampling rate in PCM R2R dacs allow for a low order gentle filter like DSD?



No for the digital filter, yes for the analog filter.

There is a gentle low order analog filter on the output of an oversampling DAC. It can be gentle because it's not the reconstruction filter. All it's doing is filtering ultrasonic noise. With some R2R DACs, you might not even need it.

But the digital reconstruction filter will still be a brick wall or close to it. Oversampling at higher rates and with longer filters allows for a more ideal filter response. It also allows for better noise shaping. But you're still stuck trying to fit a steep cut-off between 20-22 KHz regardless of how fast you oversample. Such is the nature of Redbook unfortunately, and there is no way around using brick wall filters without accepting aliasing distortion or rolling off below 20 KHz.

Same thing if you're converting 44.1 KHz PCM to DSD, the conversion will involve a brick wall filter.

If you're sourcing DSD from DSD or analog or high sample rate PCM, then you can avoid it.


Do you think there is anything intrinsically more linear about one format versus the other? I mean in reproducing a waveform, or does it just come down to the sound of filters?



Are you comparing typical oversampled Redbook playback vs. Redbook upsampled to DSD? Or R2R vs. delta-sigma? Or more generally PCM vs. DSD?

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