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LF: Re: SMPS noise cancelling software

To: <[email protected]>
Subject: LF: Re: SMPS noise cancelling software
From: "Markus Vester" <[email protected]>
Date: Sat, 8 Mar 2008 12:52:48 +0100
In-reply-to: <D497FEBD783F41C6B8AB2EEA5FF265E3@Amilo3205>
References: <000901c87ef9$2cd34960$08a3fea9@edgar1ew1re1zt> <[email protected]> <000701c88045$c681e740$0301a8c0@g3kev> <D497FEBD783F41C6B8AB2EEA5FF265E3@Amilo3205>
Reply-to: [email protected]
Sender: [email protected]
Thanks to Wolf for your encouraging comments, and your work towards extending 
the audio streaming utility to USB receivers.

I have been running the SMPS noise canceller in front of the colour-DF grabber 
last night, and it seems to have pretty much
killed two of my nastiest noise sources. To faciliate testing, here is a 
slightly different Windows-XP startup script. It offers
a wider passband centered around 1.5 kHz, and also creates the designated ..\dats subdirectory for the audio streams. After the sound
utilities and the main program have started, you should be able to hear 
cleaned-up audio from the soudcard. You can judge the effect
by pressing "b" to toggle bypass mode, or press "q" to quit. Any feedback is 
highly appreciated.

Best wishes
Markus

----- Original Message ----- From: "Markus Vester" <[email protected]>
To: <[email protected]>
Sent: Friday, March 07, 2008 1:51 PM
Subject: LF: SMPS noise cancelling software


Dear LF,

as our LF and MF receiving is often plaguesd by intense hash from various 
switch mode power supplies, I have tried to work towards
a software noise canceller, using estimation and subtraction. A short 
description of the technique, along with free experimental
software and sourcecode, can be found on 
http://members.aol.com/df6nm2/smps_nc/NC3F4.zip (63 kB). Hope you may find it 
useful...

Kind regards
Markus, DF6NM




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