tetra

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162 discussions

Strange offset in float_to_bits.c
by Frank A. Stevenson 18 Nov '12

18 Nov '12

I made this change: diff --git a/src/float_to_bits.c b/src/float_to_bits.c index 08fad54..4547ffe 100644 --- a/src/float_to_bits.c +++ b/src/float_to_bits.c @@ -113,7 +113,7 @@ int main(int argc, char **argv) exit(1); } else if (rc == 0) break; - rc = process_sym_fl(0.3f, fl); + rc = process_sym_fl(0.0f, fl); sym_int2bits(rc, bits); //printf("%2d %1u %1u %f\n", rc, bits[0], bits[1], fl); if (opt_verbose) Which improved decoding rate on correctly tuned captures. I think this 0.3 offset is an oversight that will generally increase BER. In other news, I have gotten my own GPU (openCL) assisted demodulator working, I am thinking about decoding multiple carriers concurrently with this code, but I think the gnu_radio demodulator has an edge with regards to BER, especially if the offset is set to 0.0f :-) Cheers, Frank

3 2

[PATCH] Add missing if braces in decode_chan_alloc
by Gregor 04 Oct '12

04 Oct '12

Took me longer then it should to find it.

2 1

[PATCH] Add missing if braces in decode_chan_alloc
by Gregor Gregoric 01 Oct '12

01 Oct '12

--- src/tetra_mac_pdu.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/src/tetra_mac_pdu.c b/src/tetra_mac_pdu.c index 882a0e7..70b5ec9 100644 --- a/src/tetra_mac_pdu.c +++ b/src/tetra_mac_pdu.c @@ -93,8 +93,10 @@ static int decode_chan_alloc(struct tetra_chan_alloc_decoded *cad, const uint8_t cad->ext_carr.reverse_oper = bits_to_uint(cur, 1); cur += 1; } cad->monit_pattern = bits_to_uint(cur, 2); cur += 2; - if (cad->monit_pattern == 0) - cad->monit_patt_f18 = bits_to_uint(cur, 2); cur += 2; + if (cad->monit_pattern == 0) { + cad->monit_patt_f18 = bits_to_uint(cur, 2); + cur += 2; + } if (cad->ul_dl == 0) { cad->aug.ul_dl_ass = bits_to_uint(cur, 2); cur += 2; cad->aug.bandwidth = bits_to_uint(cur, 3); cur += 3; -- 1.7.4.1 --========GMX151621349116554584744--

1 0

Audio decoding
by Javier Coso 09 Sep '12

09 Sep '12

Hi, I´m using the mod for getting the audio into ".out" files. It seems to work fine but many times the audio goes to the "16777215" file, when it should go to a real ssi file, so part of the audio is into the correct ssi_file and the other part is into the "16777215" file. It is horrible to try to listen the audio!!! Is it only my problem? Is the same to you? Regards, -- Javier Coso

1 0

speech codec - voice signal?
by Media 28 Aug '12

28 Aug '12

Hey guys, i wondering if has anyone complete the speech codec for listen to the voice signal? Is this working? Because i don't find working code to do this... Regards.

2 1

wrong decim with fcd device / osmosdr-tetra_demod_fft.py
by Stefan Mandl 24 Jul '12

24 Jul '12

Hello, using a FUNcube dongle, the first_decim rate is to high. regards Stefan My patch --- a/src/demod/python/osmosdr-tetra_demod_fft.py +++ b/src/demod/python/osmosdr-tetra_demod_fft.py @@ -61,8 +61,11 @@ class top_block(grc_wxgui.top_block_gui): out_sample_rate = symbol_rate * sps options.low_pass = options.low_pass / 2.0 - - first_decim = 10 + + if sample_rate == 96000: + first_decim = 2 + else: + first_decim = 10 self.offset = 0

1 0

code-linking
by Graham Palmer 18 Jul '12

18 Jul '12

Hi all Can anyone give me any ideas how to link the traffic.data to the channel decoder (ETSI) in real time to enable a continuous real time decoder from demod to audio. Many thanks and best regards. Graham p.

1 0

code-linking
by Graham Palmer 18 Jul '12

18 Jul '12

Hi all. Can anyone give me an idea how to link the traffic.data to the channel decoder (ETSI) in real-time to make a continuous real time decoder. Many thanks and best regards. Graham p.

1 0

Address/Usage Marker decoding patch
by Ronny Kunze 14 Jul '12

14 Jul '12

Hello, here is a small patch for the address and usage marker decoding. There is a wrong offset for the usage marker used. Ronny

2 1

control and listen tetra unencrypted network
by Media 12 Jul '12

12 Jul '12

hi all, I would like to know, if someone tested the network in ex-jugo states (like is Slovenia)? In our country use no encrypted network (clear, no TEA encrypted)... So, i wonder if is possible with osmcom project to listen (real time) to tetra groups? If is possible to do this with DVB-T reciver, like this: http://www.youtube.com/watch?v=Z0hEquzLsWU product: https://www.cosycave.co.uk/product.php?id_product=220 This means that you can monitoring all tetra network, but not for voice,because i need a voice decoder? Thanks for help and answers.

4 13

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