MP2 data corruption

[peteredhead]

Hi,

I have run into a problem using dab2eti where the MP2 data contains nothing but what sounds like monkey chatter when played back.

The problem has been encountered on different PCs, using different types of RTLSDR sticks and multiple multiplexes around the country.

Here's what I'm seeing:

• Using the latest version of dab2eti, I record the ETI for a few minutes.
• The structure of the ETI is valid. (Sync, frame charactersation, stream characterisation, etc all look good)
• I can also decode the FIC successfully.
• If I extract the MP2 frames from the ETI, it looks like a valid file but when playing back it is nothing but high-pitched glitching noises.

What's strange is that the MP2 headers look absolutely fine:

00000000  ff fc 84 40 c8 5d 55 32  23 24 22 33 22 14 49 24  |...@.]U2#$"3".I$|
00000010  90 00 00 aa aa 47 03 c8  10 c5 1c 0d 02 09 3c f3  |.....G........<.|
00000020  ce 45 04 d2 51 34 95 51  44 d2 41 34 8f 49 24 54  |.E..Q4.QD.A4.I$T|
00000030  41 24 94 45 34 93 49 44  d7 55 45 54 51 35 53 49  |A$.E4.ID.UETQ5SI|
00000040  35 17 4d 55 17 61 66 1a  6d 96 99 79 b6 da 71 b7  |5.MU.af.m..y..q.|

I can supply ETI files if that helps.

Cheers, Pete

[basicmaster]

Hi Pete,

are all (MP2) sub-channels of an ETI recording concerned or only specific ones? A regarding ETI file would be helpful.

Regards, Stefan

[peteredhead]

Hi Stefan,

Thanks for your reply. I am finding that all of the sub-channels in the ETI suffer from the same problem. I have made ETI file available here: http://we.tl/npcd5Smz5i

Trying the same approach with various files in the WorldDMB ETI library works fine.

Best wishes, Pete