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Re: LF: WOLF - a question

To: [email protected]
Subject: Re: LF: WOLF - a question
From: "James Moritz" <[email protected]>
Date: Wed, 11 Apr 2001 14:03:27 +0000
In-reply-to: <3AD4550E.24139.D4F389@localhost>
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
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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