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Author Topic: Software Noise Reduction  (Read 3726 times)
AC7CW
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Posts: 961




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« on: October 23, 2017, 07:51:53 PM »

Wonder if anybody has found success with filtering in a Windows laptop? I'm searching for hiss reduction via software. Audacity seems to do that but seemingly not for live streaming, Adobe has software that does what I want, not sure how effective it is and at $20/month I'm not going to find out. I found something at http://www.winternet.com/~swezeyt/dsp.htm but so far I can't get the demo to reduce hiss in a recording at all, probably op error of course. I have an email in to the developer. The demo version only works with recordings so I have to shell out $59 to find out how it works with streaming.
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Novice 1958, 20WPM Extra now... (and get off my lawn)
NA4IT
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« Reply #1 on: October 24, 2017, 03:54:36 AM »

Might look at some of these...

http://www.ve3ncq.ca/wordpress/?page_id=106

If those don't suit you, look for sound card spectrum software. I had one at one time that had all kinds of filters (Windoze based). I ran it off my Signalink USB. There was some lag in the receive.
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NA4IT
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« Reply #2 on: October 24, 2017, 04:06:57 AM »

Also look for software with fast Fourier transform (FFT) filters.

This may have been the software I used... http://www.qsl.net/dl4yhf/spectra1.html.

I think I played with this one also.. http://hamsoft.ca/pages/dsp-filter.php.
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AC7CW
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« Reply #3 on: October 24, 2017, 10:36:03 AM »

Thanks! I discovered VST [Virtual Studio Technology] and some ham plugins
https://www.youtube.com/watch?v=aWh2Iluc4Q8
https://www.youtube.com/watch?v=aWh2Iluc4Q8
but they seem to be more about filter bandwidths than removing hiss.

Hiss is removed from recordings to a stunning level by sampling the hiss and using the DSP to remove it. A realtime filter can't necessarily do that with SSB so maybe my search is futile...

« Last Edit: October 24, 2017, 10:43:29 AM by AC7CW » Logged

Novice 1958, 20WPM Extra now... (and get off my lawn)
AC7CW
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Posts: 961




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« Reply #4 on: October 29, 2017, 03:35:11 PM »

I'm going to revisit this when I have a proper desktop cpu and the best soundcard I can find. This laptop soundcard seems unable to deliver much with any of the abovementioned...
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Novice 1958, 20WPM Extra now... (and get off my lawn)
K5TED
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Posts: 88




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« Reply #5 on: October 30, 2017, 08:07:48 PM »

WD6CNF 'DSP Filter' works quite well

http://www.hotamateurprograms.com/

It's not clear exactly what you are attempting to do, but this program will take a live audio input and process it, and output to whatever sound device you desire.

One thing to keep in mind if you are using a PC as live DSP, you should have more than one sound device. One to take the input, and one to output the processed audio. USB sound devices are inexpensive. A 'full duplex' sound card will in some cases, depending on what you are doing, suffice. Still good to have a secondary card though. 

Your mileage may vary depending on what sort of onboard sound device you have. Laptop manufacturers of late hamstrung us by taking away the 'Stereo Mix' or 'WhatUHear' option from the record sound panel.

I recommend finding a SoundBlaster Audigy USB or similar as your secondary device. Also, take a look at VB Cable software to route audio around the digital domain.
« Last Edit: October 30, 2017, 08:21:04 PM by K5TED » Logged
AC7CW
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Posts: 961




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« Reply #6 on: October 31, 2017, 05:10:43 PM »

WD6CNF 'DSP Filter' works quite well

http://www.hotamateurprograms.com/

It's not clear exactly what you are attempting to do, but this program will take a live audio input and process it, and output to whatever sound device you desire.

One thing to keep in mind if you are using a PC as live DSP, you should have more than one sound device. One to take the input, and one to output the processed audio. USB sound devices are inexpensive. A 'full duplex' sound card will in some cases, depending on what you are doing, suffice. Still good to have a secondary card though. 

Your mileage may vary depending on what sort of onboard sound device you have. Laptop manufacturers of late hamstrung us by taking away the 'Stereo Mix' or 'WhatUHear' option from the record sound panel.

I recommend finding a SoundBlaster Audigy USB or similar as your secondary device. Also, take a look at VB Cable software to route audio around the digital domain.

I'm remoting with RCForb client to my club's station. The DSP filter from http://www.hotamateurprograms.com can select Virtual Audio Cables for input.  Preliminarily it's working fine, I can hear noise reduction that is enough to make listening comfortable. I didn't have to do any soundcard settings at all to hook it up, just set the VAC to be the output from a virtual K3 in RCForb and set the other end of it to be the input to the filter and it's all up and running. Thanks much for the link.
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Novice 1958, 20WPM Extra now... (and get off my lawn)
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