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Hi Alex, see inserts below. Tks, Ed / W2RF
From: morse-expert...@googlegroups.com <morse-expert...@googlegroups.com> On Behalf Of Alex VE3NEA
Sent: Sunday, December 13, 2020 11:15 AM
To: Morse Expert for Android <morse-expert...@googlegroups.com>
Subject: Re: Testing guidelines
Hi Ed,
At this point my focus is on the stability of the app. One user has reported that he was unable to save decoded text to a file. I am asking everyone to try this function and tell me if it works or not. One theory is that the user rejected the request for write permission and ticked the never-ask-again checkbox in the request dialog. I am not sure if this was the actual scenario or not, I need feedback on that. Also, a few testers have mentioned that they had to reboot/reload/restart (app or phone?), but never provided any detail. This is also something that should be addressed before I start looking into the decoding accuracy.
>>> decoded text is saving as expected on my Note 8, no problems to report.
As far as decoding is concerned, Morse Expert is supposed to have the same accuracy as CW Skimmer since it uses the same code. Morse Expert has to solve one extra problem that does not exist in CW Skimmer, it has to select which signal to decode. To exclude this variable, please switch to the fixed frequency mode (yellow triangle) before your tests. If you still think that decoding is not as accurate as it should be, please use the Save Signals menu command to save the next 20 seconds of data, and email me the .bin file for analysis.
>>> I have been using the triangle to select the signal to decode. In all cases it is bright yellow. There’s definitely a difference between my 3 test scenarios. Is DSP the same resolution in all cases? Also ME might be more sensitive to AGC pumping, but I have adjusted that as carefully as I can. I will test further and report back.
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Hi Alex,
I’m working on the decoding problem. To simplify things I’m sending the sidetone from my winkey to the USB audio input on the Note 8, and I’m making sure it is selected by the triangle. My preliminary tests show that decoding degrades if dBFS > -40. I don’t see signal level in the specs. Does this make sense?
Thanks,
Ed / W2RF
From: morse-expert...@googlegroups.com <morse-expert...@googlegroups.com> On Behalf Of Alex VE3NEA
Sent: Sunday, December 13, 2020 11:15 AM
To: Morse Expert for Android <morse-expert...@googlegroups.com>
Subject: Re: Testing guidelines
Hi Ed,
To view this discussion on the web visit https://groups.google.com/d/msgid/morse-expert-for-android/47bcdd28-c3bc-4b47-afdb-5b0738663341n%40googlegroups.com.
Hi Alex,
At a SNR of around 8-9dB I start getting dropout and decoding errors. The decoded chars display in a fainter font too. But from SNR just above that I get pretty good decoding. The decoding problem seems to come in at high SNR. Also it seems to take a few chars for the decoder to lock on to the “fist” and start getting chars correctly.
To test this I set up a white noise generator in parallel with the sidetone. Both have volume controls, so I can adjust the SNR by increasing the noise. The SNR readout seems to be on a sample and hold, similar to the speed, so it’s sort of difficult to adjust precisely, but I can work by ear too. With that setup I am able to test a lot of scenarios. Here I’m reporting just one, but they all seem similar to it.
With the white noise inserted in the background I sent a series of “567”. Then I dropped the noise out and repeated the series. The first set was copied correctly, but the second set was copied as “5TS7”, dropping the first dit of the 6. This seems typical of the kind of decoding error I’m seeing with real signals.
I’ve attached the text and signal files.
73, Ed / W2RF
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Hi Alex,
Sorry, here’s another try. (BTW the message I see is “Writing…” which made me think the recording process was a FIFO loop.) My current test might not be ideal, because the sidetone is full of harmonics and the noise is pure, but it’s a starting place. Hope this works.
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Flip,
What’s the complete/exact name of the morse decoder you are comparing to Morse Expert? There are a ton of them in the Play store, none exactly called Morse Decoder.
Thanks,
Ed / W2RF
From: morse-expert...@googlegroups.com <morse-expert...@googlegroups.com> On Behalf Of KT9X - Lahra Flip Svare
Sent: Saturday, December 12, 2020 10:43 PM
To: Phil Deaver <phil....@gmail.com>
Cc: Morse Expert for Android <morse-expert...@googlegroups.com>
Subject: Re: Testing guidelines
I used mine the same way I use Morse Decoder (google play store). Just holding my phone up to the speaker. But the Morse Expert barely decoded anything, unfortunately. Morse Decoder decoded about 80% of the same signal. If this app is intended to be used with audio cable input, I did not try that, as I have a computer for that. I tried it in place of Morse Decoder, but it did not decode as I hoped. Less than 5%.
To view this discussion on the web visit https://groups.google.com/d/msgid/morse-expert-for-android/CAGN_71SUMLFrFbWywW8zV1ZPB3bejyK2fJrzzzOyrsgGD6ePLQ%40mail.gmail.com.