SCOUG-HELP Mailing List Archives

<< Previous Message << >> Next Message >>

Date:	Sat, 29 Dec 2001 14:10:29 PST7
From:	Ray Davison <raydav@charter.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: oscilloscope multimedia alignment

Content Type: text/plain

=====================================================
If you are responding to someone asking for help who
may not be a member of this list, be sure to use the
REPLY TO ALL feature of your email program.
=====================================================

You seem to want something that is digitally generated. All I can do
record the output of a function generator. But, if you get desperate
---

Ray

Peter Skye wrote:
>

> Ray Davison wrote:
> >
> > Would wav files consisting of signals that
> > run for some period of time be useful?
> > Say a 1KHz square to check damping
> > factor and step or sweep sine waves.
> > Maybe a 20-20K log sweep with a 10 sec
> > sweep time.
>
> Yes, you've definitely got the idea. Sine, square and ramp (or
> triangle) waves are pretty much all you need for audio testing. I've
> never had a need for pulse testing, and the intermodulation distortion
> test using two sine waves at different frequencies would be a fiasco if
> you digitized it (due to the artifacts).
>
> I was hoping there might be a utility that would simply generate the
> waves or .wav files. I have the .WAV file format and I can write the
> program, just didn't want to. :)
>
> Sine waves (including sweep) are great for frequency response testing
> and clipping. Square waves are used for ringing tests, though consumer
> audio gear (= sound cards) aren't likely to have ringing problems.
> Low-frequency square waves can also show power supply problems. Ramp or
> triangle waves can quickly show hysteresis distortion and clipping.
>
> There are some "exotic" waves which are quite useful, such as white and
> pink noise, but I don't need them for what I'm doing. Pink noise is
> handy for acoustically tuning a room; you can try to do it with a
> slow-sweep sine wave but the nodes and nulls are huge even in the best
> rooms so it's hard to interpret the results using a sine wave.
>
> For minimum noise in an entire system, you set the gain of every stage
> so the clipping points occur simultaneously. That gives you maximum
> dynamic range, thus minimum noise, and is one great use for the
> oscilloscope.
>
> - Peter
>
> =====================================================
>
> To unsubscribe from this list, send an email message
> to "steward@scoug.com". In the body of the message,
> put the command "unsubscribe scoug-help".
>
> For problems, contact the list owner at
> "rollin@scoug.com".
>
> =====================================================

=====================================================

To unsubscribe from this list, send an email message
to "steward@scoug.com". In the body of the message,
put the command "unsubscribe scoug-help".

For problems, contact the list owner at
"rollin@scoug.com".

=====================================================

Return to [ 29 | December | 2001 ]

SCOUG, Warp Expo West, and Warpfest are trademarks of the Southern California OS/2 User Group. OS/2, Workplace Shell, and IBM are registered trademarks of International Business Machines Corporation. All other trademarks remain the property of their respective owners.