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RE: Think about being more responsible...

75.215.22.107

Todd Krieger

In Reply to: RE: Think about being more responsible... posted by Ted Smith on July 11, 2007 at 08:11:40

"The point is that you said 'Even this page has some technically bogus info..... Dither doesn't apply to D/A conversion, and such techniques are not even possible at -144 dB. The 'effective resolution' is determined by the media and A/D dither applied to the recording, not the D/A conversion.' and that is entirely false and misleading."

Anybody can conveniently claim that a statement is entirely false and misleading. And claim someone isn't responsible. But it's dangerous if done so without an explanation why.

"It's false that it's bogus,"

You *think* it's false..... I've demonstrated that it's true, and I'd be happy to do so again. This isn't rocket science.

"it's false that dither is inapplicable in D/A"

But it is inapplicable in D/A..... The only time it is applicable is in A/D conversion or when resolution (not interpolation precision) is lost in bit truncation.

"it's false that it's not possible at -144 dB."

It's not possible in the context of enhancing the signal. The ambient noise before an A/D would drown it out. (It would in essence be "self-dither.")

"You didn't understand the context of the statement and publicly accused people of 'technically bogus info' when in fact the info was correct."

If you think it's correct, state why.

Follow Ups:

RE: Think about being more responsible... - Ted Smith 09:58:44 07/11/07 (0)
Howdy

I did state why and you still don't understand their point nor that they are talking about DSP not analog circuitry...

I'm sorry that you don't understand DSP, and hence the silliness of your response. And you are right it's not rocket science, but you still don't get it.

I'll try again:

We aren't talking about the analog domain, your points about A/D and D/A are irrelevant. The original info is about their digital processing, i.e. the digital domain.

In the digital domain to preserve the most info you should use dither when you lower precision (e.g. truncate the number of bits) You can claim that they don't need to do it when they go back to 24 bit info, but then you or someone else with good measurement equipment would complain that their S/N ratio isn't what it should be. In DSP this dither isn't too expensive. The original spec was talking about their new approach to doing this dither which they claim has some advantages over the standard, say, triangular PDF dither. But to argue about whether their new dither algo is better than the old dither algo you would have to understand dither in general... so we'll save that for another day.

In the digital domain it's entirely possible to dither to any precision required, -144 dB (24 bits) is just as easy as 16 bits or 32 bits. The point is to dither to the accuracy of the following data stream or equipment, in this case presumably a 24 bit DAC chip.

If this doesn't help enough please ask some questions.

-Ted

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