Quote:
Originally posted by nec
I think you missed the point of the article. In summary it explains that upsampling is by default used in all DACs and CD players since 1984. Upsampling and oversampling are just different names for the same process. |
No, I got that, I was just so flabbergasted that I did not repeatedly "dis" it. It is my understanding that these are not the same thing. Oversampling does not introduce new "interpolated" values, as the article states. It introduces intermediate zero values, as your second link states. It is then the analog filter's job to do this so-called "interpolation". This is
more work for the analog filter. Doing this interpolation in the digital domain makes less work for the analog filter.
For example (meaning, as I meant last time, that this is only one datum of my argument, not the entirety of my argument) how could they provide intermediate values of a 16-bit signal on a 16-bit DAC, which is the most those older players had, back when oversampling was first introduced? Quote:
Sticking word "upsampling" on the DAC is a marketing ploy by manufacturer to fool people into thinking that their product is inherently better than the competition. |
Nope.
For example, in the MSB Tech Link DAC III, it's an upgrade. There's a whole separate chip/daughter board. Installed it myself.
Also, there are standalone upsampling devices, such as the GW Labs DSP and (going from memory on the name of this one) the Sonic Frontiers D2D-1. Their input: a 16/44.1 digital signal; their output: a 24/96 digital signal. I have physical proof and evidence that these do more than nothing.
I understand where you're coming from. When upsampling was first introduced onto the market, there was some confusion, and quite a bit of skepticism about what they were doing, if anything. This trickled up into the magazines. (The same thing is happening with DSD and high-res PCM.) But I'd be quite curious about all the follow-up that occured since then, and what the "audiophile" conclusions about these are now.
Not the company line, which, as you've implied, can be affected by contributing advertisers. Quote:
Even worse: some ads (for example MF's on the last page of 06/02 Stereophile) imply that by using upsampling DAC you magically transform your CDs to SACD level. |
Alright, have a hard time disagreeing with that. That's poppycock. One of the reasons that I got the GW Labs DSP is that it has a nice little feature wherein it also downconverts a 24/96 signal to CD level. I was doing this so that I could take some of my DAD's, downconvert them to CD's 16/44.1, then upsample them back to 24/96, and see if I could tell the difference. I suspect I will. They (upsampled CD and fully high-res material, such as DAD's) are
not the same. Quote:
Yeah, well, it would be nice if Stereophile was consistent. It's not like they've never been wrong before. I rememeber reading in a paragraph somewhere where the criticism of "transients" was invoked against DSD. The answer that they came back with? Something to the effect of, we asked Sony, and Sony said that SACD was really a hybrid of DSD and PCM. I would still like to see some follow-up on this, because every article that I've read since, both in Stereophile and otherwhere, contradicts this.
I think the problem is that it is not sufficiently understood, and it is hard to understand, because the two are so close. It really is getting down to the nitty-gritty, but they are different.