6322cb49a4
Cleanup demodulator, improved quantization log
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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
46c988bdc2
Restoring priority level of output streams to PRIO_BEEP when the stream terminates, made M17Modulator::emitBaseband() wait for effective stream termination before returning when transmission stop is requested. Fixes #76
2022-05-27 21:49:33 +02:00
76be50db61
Improved debug log in M17 demodulator, changed trigger condition for log dump, re-enabled audio reproduction when logging.
2022-05-27 21:49:33 +02:00
4304013d62
Updated M17 demodulator debug logger: now log data is continously updated and dumped only in case of a missed sync after lock has been acquired.
2022-05-27 21:49:33 +02:00
ff7a28ff59
RingBuffer class: implemented eraseElement() function, rewritten the pop() function in a cleaner way, fixed a bug in the pop() function causing the not_full condition variable to be never rised.
2022-05-27 21:49:33 +02:00
29ad0830f0
M17 demodulation improvement
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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
5b27e6b692
Ensure proper termination of baseband sampling when M17Demodulator::terminate() is called.
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Solves #74 .
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
115982d279
Add demod log script
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Add script to receive the demodulated data from Module17/radio, to use
it you need to add in meson.build:12 the ENABLE_DEMOD_LOG define.
Build and flash into the platform, build and run scripts/get_demod_log,
turn on the radio, remember to turn of radio before you terminate
get_demod_log, print the output with
`scripts/plot_m17_demod_csv.py serial_demod_log.csv`.
TG-81
2022-05-27 21:49:32 +02:00
c987848382
Add syncword hot re-sync fix DC removal
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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.
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On non-linux devices log data is printed on the serial port in raw binary format.
2022-05-27 21:48:47 +02:00
6be567a781
Implementation of a statically allocated ring buffer with blocking and non-blocking push and pop
2022-05-27 21:48:47 +02:00
ef61c532a3
Cleaned up quantization average
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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
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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
54112d4d7b
Increased input gain on MD-UV3x0 type of radios
2022-05-27 21:48:47 +02:00
c3c984d504
Add syncword fuzzy detection
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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
b998d3b78f
Modified time constant of DC removal high-pass filter to avoid a too high cut-off frequency when run with at fast sample rates
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
b1f2cb109f
Switch M17 Rx sample rate to 5SPS
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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
e68b05d859
Fixed double free errors in M17 code, see #73
2022-05-27 21:48:47 +02:00
2d59658d60
Switch M17 Rx sample rate to 5SPS
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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
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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
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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
2e7ed7a8f0
M17 demodulator further improvements
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- Fix phase propagation across buffers
- Fix initial syncword offset detection
- Improve quantization algorithm
TG-81
2022-05-27 21:48:47 +02:00
7d1b89550e
Rewrite quantization algorithm
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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
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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
a37e24c953
Fixed a buffer management bug inside linux input stream driver
2022-05-27 21:48:47 +02:00
086cb549c7
Stub implementation of output stream driver for linux emulator
2022-05-27 21:48:47 +02:00
beca0d2acc
Reorganised constants inside M17 demodulator class
2022-05-27 21:48:47 +02:00
77dfeef9e7
Implemented audio decoding functions in CODEC2 module
2022-05-27 21:48:47 +02:00
c7fbd98dc9
Stub implementatio of output stream driver for GDx devices
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
9139b19aac
Fixed bug in MDx input stream driver causing the SPI clock line towards the DMR chip to be set as analog input when an audio stream from the RF stage was opened
2022-05-27 21:48:47 +02:00
89c05a7332
Adjusted Module17 mic processing gain; interim-fix for DC offset removal
2022-05-27 21:48:47 +02:00
49e5486ea6
Parametric mic gain inside codec2 module
2022-05-27 21:48:47 +02:00
b144657257
Moved CODEC2 management to a dedicated module
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
4a3e31cd03
Fixed bug in M17 demodulator caused by the precedent code refactoring
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
94fdf44954
Biased Module 17 baseband DAC output to Vdd/2 when idle
2022-05-27 21:48:47 +02:00
83020d4fa3
Increased priority of CODEC2 thread, this fixes glitches when generating M17 baseband signal
2022-05-27 21:48:47 +02:00
628c341712
Small improvements to MDx and Module 17 output stream drivers
2022-05-27 21:48:47 +02:00
1bc1316f7d
Fixed bug to Module 17 input stream driver causing the thread waiting on inputStream_getData() to not be woken up when stream was stopped
2022-05-27 21:48:47 +02:00
12dc186129
Fixed bug in Module 17 output stream driver causing outputStream_sync() to hang when a stream was opened for the second time
2022-05-27 21:48:47 +02:00
Niccolò Izzo
Silvano Seva
Mathis Schmieder