Denon 2910 and 3910 upsample redbook??

I'm not sure this answers your question, but I've never seen a decent explanation for what upsampling is. All CD players since the 1980s interpolate data, that is, they create virtual samples in between the ones at 44.1 khz. This helps with the D/A conversion, but doesn't create any new information. This is sometimes called "oversampling." I don't get how oversampling is any different, or why it should be better.

No 2910 and 3910 do not up-sample Redbook. 3910 converts Redbook from 16 to 24 bit using 32 bit ADSP. Of course, at least 8 times linear oversampling is done in the Digital filter for CD which is a feature of the actual DAC. Further more the oversampled data is converted to Bitstream inside the DAC too.

When people refer to up-sampling they mean non-linear conversion of 44.1 to 96 or 192 kHz sample rate. As I mentioned in my previous posts, since 96 and 192 can not divide by 44.1 the actual CD (redbook) data is slightly truncated so the up-sampled version is actually worse than the original and this is the reason why the available up-sampling machines does not sound right (it is artificial to me). This is also the reason why the wiser DSP engineers prefer just data word expansion as there is no truncaton using this method and it still helps utilizing the latest 24 bit DACs which results in extracting even the last detail out of Redbook CD.

Regards,
Alex

Most clearly and simply put. Thanks Alex.