Idle Channel Noise?

Archived from groups: rec.audio.tech (More info?)

In article <34a4f456.0405202229.64f92a89@posting.google.com>,
Curious <curious11112001@yahoo.com> wrote:

>What is it?

In the broad sense - any noise which you detect in a signal channel,
under conditions when (in theory) you'd detect no noise at all. In a
purely analog system, this might include hiss from thermal/Johnson
noise, hum or buzz from power supply noise, etc.

Another, more specific use of the term can refer to noise of specific
types which can occur in an analog-to-digital or digital-to-analog
conversion system. Certain types of A/D and D/A conversion system
(e.g. those which use a very high sampling rate, a relatively narrow
converter, and some sort of noise-shaping feedback system) can suffer
from an effect often called "birdies" - a converted signal which
*should* be completely silent, will have a very-low-level audio tone
superimposed on it.

--
Dave Platt <dplatt@radagast.org> AE6EO
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