DB4PLE
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Re:neues Noise Reduction - Feedback
« Reply #60 on: 17. December 2017, 17:56:08 »
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Hi Andreas,
how reproduced the issue: - OVI40 UI + mcHF RF - Dummy Load - Spectrum Light On - NR off or on - AGC default settings, any AGC value
Switching between menu / no menu makes sound change obvious. And you can see it in the PC USB recording clearly.
73 Danilo
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DD4WH
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Re:neues Noise Reduction - Feedback
« Reply #62 on: 17. December 2017, 18:26:14 »
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Hi Andreas,
OVI40 + mcHF has the same noise, so it is not a question of ground loops in the ui board.
73 Frank
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----------------------------------------- Teensy Convolution SDR https://github.com/DD4WH/Teensy-ConvolutionSDR
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DB4PLE
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Re:neues Noise Reduction - Feedback
« Reply #64 on: 17. December 2017, 19:45:30 »
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Hi,
I forgot: 80m shows highest volume of the effect. On higher bands not so pronounce or even inaudible.
73 Danilo
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peter_77
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Re:neues Noise Reduction - Feedback
« Reply #65 on: 18. December 2017, 10:10:13 »
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Here is a video showing the noise effect. First scene is NR on with Scope light ON and second is Scope light OFF. You can clearly hear the sweeping noise with scope light enabled and also clearly the sound bursts when opening and closing the menues while scope light is off.
(Download file with a right click and rename it to "noise.mov" and open with VLC player or equivalent.
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Noise-mov.txt « Last Edit: 18. December 2017, 10:16:53 by peter_77 » |
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S53DZ
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Re:neues Noise Reduction - Feedback
« Reply #67 on: 18. December 2017, 13:47:57 »
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Hi,
As it was already said, the only thing that really lowers or out-nulls the LCD refresh noise is putting the UI and RF boards of an mcHF 90° off. http://lea.hamradio.si/~s53dz/arhiv/7-SDR/1-mcHF/1-mods/mcHF_90deg_inside.jpg I maid the modification this way and the result concerning the noise was excellent. Of course, said that, one have to find a mechanical solution for the enclosure, ...
On the other UI board I have changed the LCD from SPI to parallel and that helps also a little.
73 Bojan
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S53DZ
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Re:neues Noise Reduction - Feedback
« Reply #69 on: 18. December 2017, 15:48:13 »
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But of course, Andreas,
As I said, my example was with the mcHF UI/RF and yours is with OVI/OVI boards! I believe you that you have solved some PCB layout troubles on OVI/OVI setup to get better results.
BTW, I am talking about small interference in audio at no signal at the antenna input and using headphones, whereas you, on the other side, are showing a video of a QSO and audio from the loudspeaker. Different things, don't you think?
73 Bojan
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DD4WH
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Re:neues Noise Reduction - Feedback
« Reply #71 on: 10. January 2018, 21:47:07 »
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Michael DL2FW has implemented a new algorithm for the spectral noise reduction, which seems very promising, although still in alpha version.
Now we have three algorithms implemented for testing:
1.) Activate NR with the DSP box 2.) Choose algorithm in the debug menu (DEBUG menu -> NR Mode), the new one is called "Devel2" 3.) adjust parameters 4.) please report back your experience ! :-)
ADJUSTMENTS FOR DEVEL2 (noise estimation by MMSE following Gerkmann & Hendriks 2012) * alpha = NR setting in DSP box = smoothing constant for SNRprio calculation
in DEBUG menu * tax = smoothing time constant for noise power estimate (in milliseconds) [default: 72ms] * tap = smoothing time constant for smoothed speech probability (in milliseconds) [default: 152ms] * asnr = active SNR in dB [default 15dB] * SNR prio min = minimum value for SNRprio estimator [default 15dB] * all other NR settings are ignored by the devel2 algorithm
Sorry, the algorithm is quite complex now and behaves non-linearly, so I am not able to tell you anything about a "correct" setting. Please try and enjoy!
We would be very happy, if anybody could provide us with prefered settings and listening experiences !!!
WIKI: https://github.com/df8oe/UHSDR/wiki/Noise-reduction
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peter_77
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Re:neues Noise Reduction - Feedback
« Reply #72 on: 18. January 2018, 11:50:41 »
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Not so good news about the Devel2... I installed this on the standard mcHF hardware and adjusted all the parameters as described to their default values. Result: That way its not usable. These periodic scratching noises described in the threads before even got worser to such a high level that the NR function is not usable.
I made some further tests. With mode "Devel 1" its the same result als with Devel 2. If you set the mode to "Release" the scratching noise is much lesser and sometimes temporarily dissapears shortly. If you change bands it comes back. The overall level is much lower as in the Devel modes. Very interesting is the fact that 80 meters is somehow not affected. I could not reproduce the scratching noise there neither in the Devel modes nor in Release mode. All other bands are affected with the same noise level.
I also tested the same behaviour in Scope light mode and there the scratchy noise has twice the level..its worser and definitely not usable. All is gone if you switch off DSP of course.
And...only the mcHF hardware is affected by this. On the UHSDR I40 UI hardware it is not reproducable in whatever mode you choose.
You can hear the result in the attached video. Rename it to .zip, unzip it and watch the .avi.
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Devel2zip.txt « Last Edit: 18. January 2018, 12:00:55 by peter_77 » |
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peter_77
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Re:neues Noise Reduction - Feedback
« Reply #74 on: 18. January 2018, 12:17:00 »
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As i said...its classic mcHF hardware only and NOT the I40 hardware ! I maybe have to add the fact that i tested it only on SPI mode mcHFs and not on parallel ones. I dont have any parallel mode mcHF at hand for testing. On I40 UI hardware it did not happen or is reproducable there in any mode. Everything is fine there with the NR.
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« Last Edit: 18. January 2018, 12:18:41 by peter_77 » |
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