Dear Mike, LF Group,
When trying to recover a noisy signal with Wolf, it seems to be
sufficient to set the audio level so that the louder bangs and cracks
cause overload of the soundcard, but most of the time clipping is
not occurring. I do this using Spectrum Lab's input monitor scope
display, setting audio level so the normally green trace blinks red
on the noise peaks every few seconds. I have not used Cool Edit
in anger, but looking in the help files indicates that the 0dB level is
the overload point. There are also a couple of overload indicators
just to the right of the 0dB marks; however, once "lit", these stay
on, so are not very useful in this context. I think setting the audio
level so that 0dB is reached only on noise peaks should be OK.
Ignore very big peaks, so long as they only cause occasional
overloads.
The audio level is not very critical - I think the figure quoted is
signal should be between 20dB and 50dB down on overload level.
If the signal is not audible with the noise level set as above, this
condition will be satisfied. If the signal is audible, setting the signal
level so it is about 20 - 30dB down on the overload level seems to
work well.
Cheers, Jim Moritz
73 de M0BMU
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