Comments (20)
JvanKatwijk
commented on July 28, 2024
Any chance that I get a recording giving the questionable output?
Op ma 27 feb 2023 om 12:42 schreef srcejon ***@***.***>:
… A user in France reported a main TII of what should be 0x16 decoding as
0xff. I've found the same in the UK on 215.072MHz near London.
Here's a dump of some of the data computed in TII_Detector::processNULL
hulpTable[] =
{0.033322,0.032229,0.017495,0.003001,0.015740,0.005635,0.005190,0.014116,0.015232,0.017211,0.071607,0.050573,0.001726,0.006226,0.030202,0.027032,0.013247,0.015970,0.046357,0.003054,0.036548,0.014234,0.041270,0.013134,0.048222,0.534342,0.036374,0.013863,0.017658,0.316324,0.054635,0.013134,0.007199,0.006602,0.006587,0.018351,0.021258,0.024930,0.020262,0.006384,0.024990,0.046117,2.992398,0.112000,0.039069,0.004858,0.037524,0.046304,0.009315,0.007271,0.024175,0.039459,0.012557,0.030397,0.018799,0.031979,0.021991,0.011365,0.016714,0.006930,0.004808,0.026931,0.015936,0.027846,0.028176,0.017205,0.015438,0.023799,0.004915,0.028892,0.031529,0.036843,0.019947,0.453491,0.092666,0.023731,0.071105,0.268657,0.052420,0.006335,0.016436,0.008851,0.021607,0.034120,0.016978,0.037421,0.102918,0.015863,0.014173,0.146825,3.385903,0.068001,0.030084,0.007933,0.005267,0.008046,0.112886,0.615365,0.024125,0.006107,0.063406,0.058142,0.047537,0.046570,0.016502,0.031814,0.043064,0.038356,0.007928,0.006931,0.046983,0.075101,0.008154,0.136534,1.859743,0.079350,0.044245,0.035166,0.048226,0.037586,0.042892,0.016159,0.019534,0.018744,0.002744,0.022694,0.044072,0.036351,0.009865,0.053853,0.052355,0.012978,0.023112,0.010522,0.043566,0.052566,0.013896,0.016469,0.005868,0.019383,0.012732,0.021551,0.047526,0.013804,0.017613,0.038883,0.019552,0.007354,0.020700,0.031689,0.012262,0.007234,0.025951,0.017694,0.005677,0.012981,0.032183,0.053012,0.039971,0.005391,0.010107,0.004228,0.010894,0.012265,0.009924,0.030246,0.022637,0.008334,0.013652,0.611818,0.033609,0.004411,0.032916,0.070446,0.026055,0.037627,0.012676,0.037599,0.019006,0.005473,0.013352,0.014759,0.054502,0.005546,0.007376,0.062512,2.749999,0.063616,0.012755,0.003153,0.019487,0.038988,};
avgTable[] = {0.022098, 0.185391, 0.020553, 0.204533, 0.145409, 0.025552,
0.019033, 0.164639, };
C_table[] = {0.000000, 0.615365, 0.000000, 0.000000, 0.000000, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 10.988042, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, };
D_table[] = {0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0,
0, 0, 0, 0, };
maxIndex 18
x[] = {0.046357, 2.992398, 0.015438, 3.385903, 1.859743, 0.005868,
0.010894, 2.749999, };
pattern 0x59 89
invtable[89] 0xff
pattern is repeatedly 0x59, but presumably should be 0x55 to map to Main
Tii of 0x16, which suggests x[4] and x[5] are the wrong way around.
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srcejon
commented on July 28, 2024
Sure: https://sdrangel.org/downloads/dab_tii_2023-02-28T13_02_10_458.zip
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JvanKatwijk
commented on July 28, 2024
There is a slight problem, I cannot read the file. Very strange, VLC can
read it (but that does not help)
and neither the windows version of qt-dab, the fedora version nor the
ubuntu version recognize the file as legitimate wav file
Op di 28 feb 2023 om 14:06 schreef srcejon ***@***.***>:
… Sure: https://sdrangel.org/downloads/dab_tii_2023-02-28T13_02_10_458.zip
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andimik
commented on July 28, 2024
Confirmed, very strange.
Qt-DAB even says, "File not found" when I change the extension to *.sdr (assuming it's wav).
Mediainfo says,
Complete name : /home/andreas/Downloads/test.sdr
Format : Wave
File size : 37.9 MiB
Duration : 4 s 856 ms
Overall bit rate mode : Constant
Overall bit rate : 65.5 Mb/s
FileExtension_Invalid : act at9 wav
Audio
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 4 s 856 ms
Bit rate mode : Constant
Bit rate : 65.5 Mb/s
Channel(s) : 2 channels
Sampling rate : 2 048 kHz
Bit depth : 16 bits
Stream size : 37.9 MiB (100%)
eti-cmdline says
./eti-cmdline-wavfiles -F ~/Downloads/test.sdr
/home/andreas/Downloads/test.sdr is not a recorded dab file, sorry
Installing device failed, fatal25
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srcejon
commented on July 28, 2024
It"s a 16-bit 2.048MSa/s IQ .wav file recorded in SDRangel. I'll have to build qt-dab to see what it needs.
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JvanKatwijk
commented on July 28, 2024
can you just build a "raw" file when using a dabstick?
I know there are some(times) issues with the distributions of the
libsndfile lib.
Op wo 1 mrt 2023 om 19:55 schreef srcejon ***@***.***>:
… It"s a 16-bit 2.048MSa/s IQ .wav file recorded in SDRangel. I'll have to
build qt-dab to see what it needs.
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andimik
commented on July 28, 2024
Oh, indeed, it's a 16bit 2ch wave file, Jan.
I checked under Windows. It's very difficult to lock. Left and right there are very strong signals.
Needed to use a bw filter.
I get
0x59 22 18
0x59 22 01
QIRX 4.0.7.0 TII Logger started at 2023_03_01 19:07:17 UTC
All times in the log are UTC as received from DAB!
Date/Time Chn EId Label MER Thrsh Patt M_Id S_Id Stren km abs km rel Bearing Own Lat Own Long OwnMSL Valid
---------------------- --- ---- ------------------ ---- ----- ---- ---- ---- ----- ------ ------ ------- --------- --------- ------ -----
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 9.1 0.24 0x59 22 18 0.872 1178.0 0.0 299.2 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 9.9 0.13 0x59 22 18 0.869 1178.0 0.0 299.2 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 9.9 0.13 0x59 22 1 0.157 1192.5 14.5 298.1 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 7.8 0.24 0x65 26 5 0.645 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 7.8 0.24 0x93 39 8 0.610 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 7.8 0.24 0xac 50 0 0.558 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 7.8 0.24 0xac 50 1 0.524 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 7.8 0.24 0xf 0 22 0.479 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0x65 26 5 0.645 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0x93 39 8 0.610 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xac 50 0 0.558 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xac 50 1 0.524 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xf 0 22 0.479 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.7 0.24 0x65 26 5 0.645 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.7 0.24 0x93 39 8 0.610 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.7 0.24 0xac 50 0 0.558 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.7 0.24 0xac 50 1 0.524 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.7 0.24 0xf 0 22 0.479 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.7 0.28 0x59 22 18 0.894 1178.0 0.0 299.2 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 9.8 0.14 0x59 22 18 0.874 1178.0 0.0 299.2 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.0 0.24 0x65 26 5 0.645 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.0 0.24 0x93 39 8 0.610 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.0 0.24 0xac 50 0 0.558 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.0 0.24 0xac 50 1 0.524 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 8.0 0.24 0xf 0 22 0.479 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0x65 26 5 0.645 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0x93 39 8 0.610 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xac 50 0 0.558 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xac 50 1 0.524 0.000000 0.000000 -999 False
2023-02-28 13:02:00 Z NN C1B2 (Herts Beds Bucks) 4.9 0.24 0xf 0 22 0.479 0.000000 0.000000 -999 False
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andimik
commented on July 28, 2024
These are the transmitters, right?
---------------------------
Hemel Hempstead/Pimlico
---------------------------
Id: 2800259
Latitude: 51.7285
Longitude: -.4261
Altitude: 137m
Name: Hemel Hempstead/Pimlico
DAB Block: 10D
EId: C1B2
Main, SubId: 22 18
Frequency: 215.072MHz
Ant. Height: 69m
Power: 4KW
Polarisation: v
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andimik
commented on July 28, 2024
Dear Clem, assuming (= I don't know the spec, but even my muxes here have 2 hex numbers) that the pattern always contains of 2 hex numbers, Qirx shows it as 0xf (one digit) as well.
Any idea?
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srcejon
commented on July 28, 2024
Yes, those are the transmitters. I updated the original comment to use the correct decimal number!
So actually, it looks like pattern is calculated properly as 0x59 / 89 / 0131
In table[]
0131, // 0 1 0 1 1 0 0 1 22
However, is the bug here:
for (i = 0; i < 70; ++i)
invTable [table [i]] = i;
for (i = 71; i < 256; i ++)
invTable [i] = -1;
The first for loop sets invTable[89] to 22, then the second for loop sets it back to -1.
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srcejon
commented on July 28, 2024
If I change the code to:
for (i = 0; i < 256; i ++)
invTable [i] = -1;
for (i = 0; i < 70; ++i)
invTable [table [i]] = i;
The TII is now correctly decoded as 0x16 (22).
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andimik
commented on July 28, 2024
but do you mean 0xff or 0xf?
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srcejon
commented on July 28, 2024
I was always getting a main TII of 0xff (which makes sense, as that table entry is set to -1 in the code above)
I'm not quite sure what you are referring to with regards to Qirx and 0xf. I can't see that in the screenshot you posted.
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andimik
commented on July 28, 2024
The 8th line shows 0xf, not 0xff
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srcejon
commented on July 28, 2024
The 8th line shows 0xf, not 0xff
Ah, I see, in the text below the image. I presume that is because a pattern of 0xf maps to a M_Id of 0:
0017, // 0 0 0 0 1 1 1 1 0
I was definitely getting a pattern of 0x59, which was mapping to a TII of 0xff.
I think it is a bug just by inspecting the code above. invTable is corrupted.
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softsyst
commented on July 28, 2024
Dear Clem, assuming (= I don't know the spec, but even my muxes here have 2 hex numbers) that the pattern always contains of 2 hex numbers, Qirx shows it as 0xf (one digit) as well.
Any idea?
Hello Andreas,
Please have a look at the DAB Standard ETSI EN 300 401 V2.1.1, p. 114, Table 26:
The column p is the TII Main Id, the pattern is the column ab(p). The correspondence is 1:1.
The pattern is just a binary number, which is usually converted into hexadecimal.
The pattern 00001111 (binary) is in hex 0x0f or simple f. 0x0f and f and 00001111 are all identical, decimal 15.
Thus, if the pattern f (=0x0f=00001111) is deocded, this indicates a Main Id of 0 (p value in that row of the table).
As you see by inspecting the table, there is no pattern 0xff, as the table ends at 0xf0 (binary 11110000). The rule guiding the pattern construction is that there MUST be exactly four binary 1's in the pattern, otherwise it is no longer unambiguous (I describe the drawback of this construction principle in detail in my "TII collision" tutorial).
The raw file which I also downloaded is near to unusable, as it is only a few seconds short. This is not enough (at least in qirx) to let all the TII carriers come to a stable state, to allow a correct decoding. As you see from the CIR spectrum, there are probably 5 transmitters contributing to the spectrum, as there are 5 clear peaks in the sepctrum. Due to the short time in my run only one is decoded, being 22/18.
This is also the reason why most of the entries in the TII logging file presented above are crap, they indicate mostly noise.
As correctly mentioned by @srcejon (in his revised table), the ETSI table shows for the Main Id 22 the binary pattern 01011001, which is hex 0x59, or decimal 89.
If a somewhat longer raw file were possible, I am pretty confident that at least three transmitters - perhaps even five - could be decoded, as the carriers are rather clearly showing up in the TII spectrum.
Best,
Clem
Here is the decoding with CIR and TII spectra.
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andimik
commented on July 28, 2024
Many thanks, Clem for your very detailed answer! Appreciating that a lot!
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softsyst
commented on July 28, 2024
You're very welcome, as always!
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JvanKatwijk
commented on July 28, 2024
whow, that is good thinking.
Of course I tried to optimize here, and again, it shows that "optimization
kills"
Thanks for pointing this out. It also needs to be changed in Qt-DAB. I'll
make the change in dab-cmdline as well
Op wo 1 mrt 2023 om 20:41 schreef srcejon ***@***.***>:
… Yes, those are the transmitters. Update the original comment to use the
correct decimal number!
So actually, it looks like pattern is calculated properly as 0x59 / 89 /
0131
In table[]
0131, // 0 1 0 1 1 0 0 1 22
However, is the bug here:
for (i = 0; i < 70; ++i)
invTable [table [i]] = i;
for (i = 71; i < 256; i ++)
invTable [i] = -1;
The first for loop sets invTable[89] to 22, then the second for loop sets
it back to -1.
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srcejon
commented on July 28, 2024
Thanks for the fix!
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