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

In article <48180c72$0$7713$4c368faf@[EMAIL PROTECTED]
>,
Green Xenon [Radium] <glucegen1@[EMAIL PROTECTED]
> wrote:

>I want my audio system to be able to record, process, playback, receive, 
>transmit, generate, reproduce and otherwise perfectly-handle audio and 
>ultrasonic acoustic signals as loud as 200 dB without any clipping and 
>as high-frequency as 300 GHz without any aliasing.

>300 GHz is the highest ultrasonic acoustic frequency that can exist in 
>Earth's atmosphere, as you can see below.

>Igor wrote in http://www.lns.cornell.edu/spr/2006-11/msg0075905.html
:

>"The mean free path in air at sea level is about 0.1 micron[1]. Let's
>take the speed of sound to be roughly 300 m/s. Then the upper limit on
>sustainable sound frequencies is

>f_max = (300 m/s) / (10^-7 m) = 3*10^9 Hz = 3 GHz."

And, as Bob Morein explained to you in some detail back in December of
last year, the mean free path travel distance is *not* the primary
limiting factor on the upper frequency which can be carried through
the air via sound.  Rather, it's the kinetic energy of the
molecules... and this limits the upper frequency to around 30 MHz.

Similarly, the "200 dB" maximum SPL you ask for is meaningless
(assuming you're referencing it to the usual "0 dB" standard of
pressure, which is set to the minimum volume level that a human
listener can detect in an otherwise-silent environment) since it
exceeds the theoretical limit for the passage of undistorted sound
through atmosphere at sea level (which one reference gives as being
194 dB).  You cannot have "200 dB" and "perfectly handle... without
any clipping", because the air itself will distort the signal.

It's also far, *far* above the "threshold of pain" (at which the sound
becomes unbearable to the listener) and the "threshold of damage" (at
which irreversable damage to the listener's hearing can occur even due
to short exposures).

>Unfortunately for me, this audio system of mine is way too good to ever 
>be true.

It's not just "way too good to ever be true".  It's defined in a way
which is actually *meaningless*.

And, if it weren't meaningless, it wouldn't be an audio reproduction
system.  It would be a weapon of war.

-- 
Dave Platt <dplatt@[EMAIL PROTECTED]
>                                   AE6EO
Friends of Jade Warrior home page:  http://www.radagast.org/jade-warrior
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