Re: Is 44.1 KHz sample-rate enough? Yes and No.

"Randy Yates" <yates@[EMAIL PROTECTED]
> wrote in message
news:m3k5igno45.fsf@[EMAIL PROTECTED]
> However, it may be POSSIBLE to reach 144 dB DR in a DAC. For example,
> Figure 9 from my presentation on delta-sigma D/A conversion

Sure, in theory. Never said it wasn't.

> > I'm still puzzled how one is going to listen to 144dB dynamic range
even
IF
> > it was possible. Any suggestions Randy?
>
> I'm not sure what the problem would be since you can always turn the
> "volume" down and let the soft parts drop into the ambient noise floor
> (either thermal or acoustical).

That's simply manual compression to reduce the dynamic range. Simply do it
before putting on disk, as is the current practice.
The full dynamic range would require an SPL 144dB above the threshold of
your hearing, plus any extra environmental noise that causes any masking.
NOT something I want to attempt, but you are welcome :-)


>You might even get better results than
> you think given the ear's ability to act like an adaptive matched filter
> (e.g., you can hear a sine wave well below the noise floor).

I'm sure you know the difference between wide band and narrow band DNR
measurements?
CD's can go better than 96dB when measured narrow band too. A sine wave
below the *full band noise floor* is no problem.


> I never intended to challenge the impracticality of it, only the
> possibility. I don't believe it's IMPOSSIBLE to achieve this level of
> dynamic range.

And I never said it was. But there is NO available hardware, the
difficulties are enormous, and you couldn't use it for actual listening in
any case.
Read carefully what I have said all along.

MrT.