Re: Using a sound card for measurement.
- From: Edmund <nomail@xxxxxxxxxxx>
- Date: 12 May 2008 18:18:17 GMT
On Mon, 12 May 2008 05:34:19 -0700, Richard Crowley wrote:
"Edmund" wrote ...
I want to do some testing with a sound card for measurements. A few
things I need are :
1 Some player which can play 192kHz sampled sounds.
So go shopping for a sound card that fits your requirements. Don't be
surprised if you don't find any popular-priced products that will have
that range, however. You may be forced to look at industrial lab
equipment if you want waveform generation up in those ranges.
The sound card in my laptop is able to do that.
2 A way of “making” such sound file from a PCM data text file.
The math for creating sine waves is pretty simple. Most any programming
language (even one-chip microcontrollers) have a "sine" function.
OK that's not a problem, but I need play that sine, so I
expect it has to be in a some standardized format that
a windows player understands. So I must make an 192kHz
sampled wav file?? if that is possible.
3 An oscilloscope program which can record about 20 minutes
of 192kHz sampled data and save it as PCM text data.
Are you sure you want that? You are talking about 230,400,000 sample
values per channel. Do you have the software it takes to analyze (or
even view) a text file that large?
I realize it is quite a lot data but thats not a real problem, I don't
need all that, I need some parts of it. These parts I can easily select.
An alternative would be a 'logging' program that automatically
starts and stops simultaneous with the played or generated sound.
Recording all seems simple.
You also don't mention any bit-depths (8 bit?, 16 bit?, 24 bit?) What
is the application?
That depends what my sound card supports, 16 bit will be good enough.
One thing I like to do is automatically measure the impedance from
a speaker unit.
My sound card can produce a remarkably good sine wave up til a least 45
kHz ( did not yet test higher yet ) with a sound generator but this
generator can not automatic produce all frequencies I want.
The only difference between a sine wave at 1KHz and a sine wave at
100KHz is the period. The math is the same
I am talking about the analoge output, measured with an oscilloscope.
What kind sound file format can be used for reproducing 96kHz with a PC
/ laptop ?
No difference from the one that will do 9.6 KHz. The difference is in
the hardware, not the software or the data.
Hmm CD's use a sample rate of 44.1 kHz so that will definitely not
produce 96 kHz.
Is there any (free?) tool out there to make such a sound file?
How are you making the files you are using now?
I don't have anything for it now, so far I only used a sound generator.
There are free and inexpensive software applications that will create
various waveforms using your computer sound card. Google can find them
for you in a few milliseconds.
If you get hardware that supports 192KHz, it will almost certainly come
with software that will run it, or at least demonstrate its
capabilities.
Not with my laptop :-)
Edmund
.
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