Message-ID: <B989666F1D3B443B96094EAD88A6DFC7@Amilo3205>
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
References: <000901c87ef9$2cd34960$08a3fea9@edgar1ew1re1zt> <47D1150A.6090407@ukonline.co.uk> <000701c88045$c681e740$0301a8c0@g3kev> <D497FEBD783F41C6B8AB2EEA5FF265E3@Amilo3205> <DBCF865A16A14180B06D2E4590E6F6E6@Amilo3205>
In-Reply-To: <DBCF865A16A14180B06D2E4590E6F6E6@Amilo3205>
Date: Sat, 8 Mar 2008 13:00:54 +0100
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Subject: LF: Re: SMPS noise cancelling software (with appendix)
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...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
>>
>>
>>
> 

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