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Oh, we could be zeroes, just for one day ...

Chiming in here. Don't even remember whose post I'm responding to (so Ted I'm not picking on you ok?)

Again a lot of confusion, but then industry has done its darnedest best to confuse this for all, not?

You're all pretty close (even Todd, in a way ;-) so there is not much reason for argument. All together in a room with a whiteboard? I'd be glad to. Who's bringing the wine?

Just a couple of remarks, linked to the zillions of posts around this thread.

1) Why did ASRC make it to consumer audio? Because marketing/sales needed a reason to shift more gear. Because DVD was all 48/96/192 (CD should have been 48, too ;-), and they wanted to cash in on the 96/192 buzzwords. How does ASRC sound to them? Easy: like the opening bars of that Pink Floyd song ... That's ALL what matters at the corporate level. And yes, even audio-noble companies like dBS would go that low to shift more gear that way. Especially with the consumer audio world being what it is.

2) Mathematically there is not much wrong with ASRC. Build one for yourself with Matlab and see/listen. Of course, if you have to put one in half a square mm of silicon things look slightly different ...

3) Figure 4 in that AD note is OK. Nothing wrong with it, actually.
Especially 4d, Yes Todd, 4d is correct. Adding zeroes in a dirac-impulse sample train does not alter its informational content or its spectrum. It only moves the stream sample frequency ('enlargens the unit circle'), so that some of what before was above fs/2 (images), now sits below fs/2.
If just zero-stuffed, would the signal sound like music? Of course. It would be like a NONOS DAC. I could generate you music samples of 48kHz baseband, and then the same stream with 2x zeroes (96k) or even 4x (192k). Can you replay such files?

4) Damn, I forgot what I wanted to say ...


Cheers,


W




bring back dynamic range

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