A
Arny Krueger
Guest
<calcerise@hotmail.com> wrote in message
news:1105418183.224771.81960@f14g2000cwb.googlegroups.com
like Swiss Cheese if not Muenster. Let's see if you have the facts to back
this one up.
matter of picking the physical configuration you want. Obviously Cal doesn't
know about audio interfaces at all, even common ones like a Delta 1010 seem
to have eluded his fractional-second technical *study*.
Obviously Cal, you are not well-informed about audio interfaces or PCs.
and output connections including XLR, TRS, and RCA.
or aluminum boxes with some kind of RF bypassing on all of the inputs and
outputs.
circuitry entirely inside the PC, on a PCI card.
professional audio purposes. They are widely availble with true balanced
input and output connections. While audio interfaces are typically
AC-coupled, so is virtually every other piece of audio production equipment
on the market today.
as well.
audio interfaces as well.
are used for test and measurement purposes.
used and have excellent performance.
System Two for $10K (used) -$25K and up (new), or you pop a $850 LynxTWO
into a $500 PC and run Audition ($300) and Spectra Lab ($800) software on it
for a total of about $2500 brand new. BTW the prices I'm quoting are highly
approximate, YMMV.
Finally, there are some problems with PCs + sound cards as test equipment
that weren't covered in Cal's post, and as soon as Cal admits this post of
his is like totally wrong, I'll tell what they are.
news:1105418183.224771.81960@f14g2000cwb.googlegroups.com
OK, that's your opinion, Cal. So far your posts have been full of holesJust as Jack Mormons are untempleworthy and aircraft can be
unairworthy, a PC is unbenchworthy when used as a source or a
demodulator of audio for test and measurement purposes.
like Swiss Cheese if not Muenster. Let's see if you have the facts to back
this one up.
Wrong. The audio interface can be wherever you want it to be, its just aFor one thing, the drives and power and reset buttons are on the front
whereas the sound card, usually the I/O in this application, is either
a PCI card in the back or on the motherboard.
matter of picking the physical configuration you want. Obviously Cal doesn't
know about audio interfaces at all, even common ones like a Delta 1010 seem
to have eluded his fractional-second technical *study*.
Obviously Cal, you are not well-informed about audio interfaces or PCs.
Wrong, Audio interfaces are available with a variety of common audio inputThe input and output are by a couple of sub-mini phono jacks.
and output connections including XLR, TRS, and RCA.
Wrong. In fact PC power supplies are as a rule built inside shielded steelThis alone makes it unbenchworthy. But these problems can be addressed
by DIY measures. The fact is that others, however, cannot.
The PC has a low-priced, noisy switchmode supply and a usually total
lack of RF shielding internally.
or aluminum boxes with some kind of RF bypassing on all of the inputs and
outputs.
Wrong. In fact some of the quietest audio interfaces that exist have theirWhile not audible, the noise level
can and will be induced in cabling to the DUT, the DUT itself, and
everywhere else.
circuitry entirely inside the PC, on a PCI card.
Wrong, computer audio interfaces are widely used for audio production andThe PC soundcard is an entertainment grade, AC-coupled, single ended
affair.
professional audio purposes. They are widely availble with true balanced
input and output connections. While audio interfaces are typically
AC-coupled, so is virtually every other piece of audio production equipment
on the market today.
You want quality audio? You pay for it. True for computer audio interfacesPCI cards with more sophisticated, instrument grade design do
exist-however they are often quite expensive.
as well.
You still want quality audio? You still pay for it. Still true for computerSerious cards designed for legit T&M work, usually CompactPCI, PXI, or
VME/VXI, are
astonishingly expensive.
audio interfaces as well.
Actually, there's a wide variety of computer PCI cards on the market thatAs are their host backplanes, enclosures, and
CPU cards (although old VMEbus stuff can usually be found and the
appropriate software compiled for the OS you wind up running.)
are used for test and measurement purposes.
You forgot the part where these supposedly unsuitable products are widelyThere are PC PCI oscilloscopes, spectrum analyzers, and arbs which
provide their own shielded and filtered micro-environment, but not
only they no cheaper than a standalone piece of test equipment, the
host PC still has all of the above disadvantages.
used and have excellent performance.
Right now its a two-option feasibility study. You buy an Audio PrecisionIn short, PC-based test sucks for hobbyists, technicians, and
educators.
System Two for $10K (used) -$25K and up (new), or you pop a $850 LynxTWO
into a $500 PC and run Audition ($300) and Spectra Lab ($800) software on it
for a total of about $2500 brand new. BTW the prices I'm quoting are highly
approximate, YMMV.
Finally, there are some problems with PCs + sound cards as test equipment
that weren't covered in Cal's post, and as soon as Cal admits this post of
his is like totally wrong, I'll tell what they are.
BS.It's probably OK for ATE installations, usually they go
with the aforementioned PXI or VXI for good measure and inflate the
budget anyway.