white (?) noise

white (?) noise

Post by Jan Siepel » Sun, 15 Aug 2004 03:33:52

I have an older computer with soundcard. The soundcard is connected to my
amplifier (aux. input).
I recently discovered the possibility of downloading mp3 files.
There's a lot of music available I like (classic rock from teh 70's and
There's only one small problem.
I always hear this sound which is called white noise I believe?
Sorry if I'm wrong, but I'm not a native English speaker.
Anyone who knows, if this has to do with the quality of the sound card /
computer (PII-350 Mhz) or with the connection between computer and
Thanks in advance.

white (?) noise

Post by NoSpa » Sun, 15 Aug 2004 09:11:48

On Fri, 13 Aug 2004 20:33:52 +0200, "Jan Siepelstad"

White noise is a broadband hiss such as one used to hear on
old non-digital FM receivers when tuned between stations.
(Showing my age here!) It could be due to a number of different
things. It might be a poor sound card (low signal-to-noise ratio),
but it can also be caused by recordings made at too low a level
that is then boosted on playback to get back to a normal level...
you end up boosting the residual noise of the system that is
normally masked by a louder signal.

If you only notice this on MP3s, it could be an artifact of using
too low a bit rate.

It's not likely to be related to connections between the card
and external amp. Bad connections typically manifest as
hum at the mains frequency (50 or 60 Hz), plus harmonics
of that.

If you want to verify what white noise sounds like (or pink
noise or band-limited noise or just about any kind of signal
you can imagine), you can download my free DaqGen for
Windows signal generator software at the site below.
I'd be glad to answer questions about it.

Bob Masta

Data AcQuisition And Real-Time Analysis