1011dd1081
Moved audio_stream.h from interfaces to core headers
2023-08-30 18:04:24 +02:00
278d7850c7
M17: add data structures for GNSS and extended callsign metadata.
2023-08-28 10:25:46 +02:00
e93b461beb
Added phase inversion setting to M17 modulator
2023-05-29 22:12:40 +02:00
4a3bc93fa4
Always send an M17 EOT frame as the last frame before terminating baseband output
2023-03-12 16:27:31 +01:00
a89a7523cb
Updated year in copyright headers
2023-02-08 16:33:02 +01:00
49c6cbd7c0
Added implementation of soft-decision Viterbi decoder for M17 protocol, updated version number in meson.build
2022-11-11 22:04:34 +01:00
21481072e7
Moved audio management in M17 opmode handler to audio path system
2022-10-28 09:47:47 +02:00
b5fc9b252d
Moved code of compensating filter for MDx PWM-based DAC to a dedicated class.
2022-08-28 12:17:04 +02:00
d11bb903b1
Made public the M17Modulator.stop() function, added macro to enable the transmission of an M17 EOT frame (disabled by default).
2022-08-28 12:00:36 +02:00
fa33f15417
Implemented M17 EOT marker
2022-08-28 11:59:31 +02:00
a22aceb576
Reorganized code for M17 transmission: removed M17Transmitter class, use M17FrameEncoder to assemble LSF and data frames, modified API of M17Modulator class.
2022-08-28 11:59:31 +02:00
9c2091c060
Changed M17 RX behaviour so that received stream data is forwarded to codec2 decode only when a full valid LSF is received.
2022-07-21 22:14:55 +02:00
54af6bf429
Made decode functions in M17Viterbi class return the final decode cost
2022-07-21 22:03:48 +02:00
54aa794bf8
Changed file extension of all C++ only header files from .h to .hpp
2022-07-09 18:22:36 +02:00
34c90c2485
Moved FIR filter class to a dedicated header file
2022-07-09 18:07:42 +02:00
d2e0b7d940
Improved heap memory management in M17 modulator class
2022-06-05 12:27:25 +02:00
a1888ae19e
Improved heap memory management in M17 demodulator class
2022-06-05 12:24:43 +02:00
4d4ebae2f3
Added configurable phase inversion to M17 demodulator. Forced enabling of phase inversion for MD3x0 VHF radios.
2022-05-30 19:19:01 +02:00
bfa3494777
Fixed bug in M17 demodulator causing the M17Demodulator::getFrame() function to return the frame currently being processed instead of the fully demodulated one.
2022-05-27 21:49:33 +02:00
63f4c787c0
Moved helper functions for M17 Golay to a dedicated source file
2022-05-27 21:49:33 +02:00
6322cb49a4
Cleanup demodulator, improved quantization log
...
Unified offset and phase variable to reduce the chance of off-by-ones
between buffers. Improved logging on linux and module17 adding
quantization indices.
TG-81
2022-05-27 21:49:33 +02:00
29ad0830f0
M17 demodulation improvement
...
Add logging in syncword sweep, fix unsigned underflow bug,
fixed symbol average computation for quantization.
Do syncword sweep whenever available.
TG-81
2022-05-27 21:49:33 +02:00
d17d683b2d
M17 code cleanup pass: reorganised data type definitions and constants
2022-05-27 21:49:33 +02:00
7aff678069
Improved robustness of frame type detection, now based on minimum hamming distance between syncwords
2022-05-27 21:49:33 +02:00
c987848382
Add syncword hot re-sync fix DC removal
...
DC removal filter had a bug that created weird positive spikes on
Module17, add a syncword hot re-sync to be able to correct small phase
errors that appear every five seconds more or less.
TG-81
2022-05-27 21:48:47 +02:00
1f77c2af6c
Reorganised logging inside M17 demodulator, logging is disabled by default.
...
On non-linux devices log data is printed on the serial port in raw binary format.
2022-05-27 21:48:47 +02:00
ef61c532a3
Cleaned up quantization average
...
Now average is computed over all the syncword symbols, for each syncword
as a simple average.
TG-81
2022-05-27 21:48:47 +02:00
5fe5b0e578
Refactor M17 logging
...
Refactored logging functions to enable in-system logging on Module17 and
MDx radios.
TG-81
2022-05-27 21:48:47 +02:00
361308be16
Generator of pseudorandom binary sequence compliant with M17 specification
2022-05-27 21:48:47 +02:00
3988540b6c
Changed coefficients for the 41-tap, 24kHz RRC filter to have unitary input-output gain
2022-05-27 21:48:47 +02:00
c3c984d504
Add syncword fuzzy detection
...
Frame decoder now tolerates bit error in syncword, removed syncword type
detection in demodulator code.
TG-81
2022-05-27 21:48:47 +02:00
6b31a73f42
Corrected RRC gain and changed HR_C5000 modulation factor and input gain to have the correct 2.4kHz deviation when transmitting M17 with an MD3x0 radio
2022-05-27 21:48:47 +02:00
2d59658d60
Switch M17 Rx sample rate to 5SPS
...
Due to the RRC computation sometimes violating the timing constraints,
we switched the M17 demodulator to 5 samples per symbol (24KHz), thus
dividing the processing time by four ar the number of samples halves as
well as the number of taps of the RRC.
Minor adaptation on the code followed.
TG-81
2022-05-27 21:48:47 +02:00
63bd864674
Fix M17 Rx LED
...
Now LED turns on when a syncword is successfully detected, not just when
the correlation is sufficiently high.
TG-81
2022-05-27 21:48:47 +02:00
c4483edff0
Improve quantization strategy
...
Now quantization is performed by averaging syncword samples and dividing
the resulting threshold by a constant.
TG-81
2022-05-27 21:48:47 +02:00
7d1b89550e
Rewrite quantization algorithm
...
Quantization algorithm is now based on separate rolling averages for
positive and negative samples.
Merged csv outputs from syncword search and quantization on Linux.
TG-81
2022-05-27 21:48:47 +02:00
aa9fcc26b7
Remove useless DC bias in quantization
...
TG-81
2022-05-27 21:48:47 +02:00
d1651a702c
Add proper DC-bias removal, tuned EMAs
2022-05-27 21:48:47 +02:00
da5c453852
Implemented unpacking and decoding of M17 audio stream frames
2022-05-27 21:48:47 +02:00
beca0d2acc
Reorganised constants inside M17 demodulator class
2022-05-27 21:48:47 +02:00
fda0fed5e7
Moved constant specifying sample rate for M17 baseband decoding from hwconfig.h files to M17Demodulator class
2022-05-27 21:48:47 +02:00
e5b5daba85
Moved state variables of PWM compensator and DC removal filter outside the function bodies to allow keeping their consistency among function calls
2022-05-27 21:48:47 +02:00
4b8685b853
Changed gain and added an offset at tx RRC stage only for Module 17 to compensate for an hardware bug
2022-05-27 21:48:47 +02:00
d1b4973cc9
Fixed reset of DC bias on stream stop in Module 17 output stream driver, made parametric the gain of the RRC at modulator side
2022-05-27 21:48:47 +02:00
54a89abcd0
Removed a printf left behind after debugging from M17 demodulator class and slightly cleaned up the code
2022-05-27 21:48:47 +02:00
c9a4bfb199
Cleanup and refactoring of M17 modulator class, now using output streams for baseband signal output
2022-05-27 21:48:47 +02:00
427c5f50b3
Made M17Demodulator::update() return a boolean indicating when a new decoded frame is ready
2022-05-27 21:48:47 +02:00
77aead675a
Improve runtime performance of M17 Demodulator
...
Tweaked the exponential moving average alpha factors to improve the
reactivity of the M17 demodulator.
TG-81
2022-05-27 21:48:47 +02:00
5ef145cd39
Add fuzzy syncword validation
...
Now syncword match is not exact but can tolerate up to two erroneous
bits.
TG-81
2022-05-27 21:48:47 +02:00
ca49b306b9
Update constants for M17 demodulation
...
Constants were updated to increase performance based on baseband sample
collected with Module17.
TG-81
2022-05-27 21:48:47 +02:00
Silvano Seva
marco
Jacob McSwain
Niccolò Izzo