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KB2VXA > DSP 13.07.03 03:53l 47 Lines 1952 Bytes #999 (0) @ WW
BID : 10172_WT3V
Read: GUEST DB0FHN DK5RAS
Subj: Re: G0FTD > DSP & impulse noise
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<VK6HGR<VK5UJ<VK5BRC<VK5ATB<VK2AAB<
FK8KAB<N7QDN<K1UOL<K1UOL<WA2PNU<KC2COJ<WT3V
Sent: 030711/0544Z @:WT3V.#CNJ.NJ.USA.NA #:10172 [Lakehurst] $:10172_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NA
To : DSP@WW
Hi Andy,
Without realizing it you have answered your own question.
To begin with, I experience the same noise you describe on all HF bands
which is AC mains related in some way as during a recent power failure it
disappeared completely. The DSP built into the IC-706 Mk2G when properly
adjusted is completely effective against my being deafened by it, but DSP
has it's limitations which are much greater when dealing with audio DSP
than the more effective IF DSP. In either case the ears may be saved from
the racket but wanted signals still suffer, such is the nature of the
beast.
On the other hand I have a GE Mastr2 VHF LO FM rig converted to 6M with
IF noise blanking which suffers not a whit from the effects of this
noise. I have experience with several receivers which employ IF noise
blankers, some more effective than others and once had an old CB rig in
which it was completely innefective. The conclusion which may be drawn is
simply that some are better than others. You just haven't found a good
one yet.
As for answering your own question, since you say that a noise blanker
which I assume works in the IF is innefective, what makes you think that
using the exact same method in the audio chain will be? FYI, those noise
reduction algorithms you speak of include the simplest one of all which
does exactly what you're looking to do only it works with a digital train
rather than audio. Remove the noise bits or remove the waveform, six of
one and half dozen of the other.
Sorry there Andy, there is no such thing as perfection in the real world,
only Perfection Nevada and they have giant killer worms. (;->)
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
E-MAIL: kb2vxa@juno.com
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Message timed: 05:51 on 2003-Jul-11 GMT
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