LF: Re: SMPS noise cancelling software (with appendix)

["Markus Vester" <markusvester@aol.com>]

...resending as the appended .bat had apparently been removed. 73 - Markus

----- Original Message ----- 
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, March 08, 2008 12:52 PM
Subject: LF: Re: SMPS noise cancelling software


> 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" <markusvester@aol.com>
> To: <rsgb_lf_group@blacksheep.org>
> 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

start_nc3f4_5512_mono.zip
Description: Zip compressed data