f82fd1f8d7
Tease apart utility.hpp, other header dependencies.
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Trying to get a host-testable FSK demodulator, and finding a lot of M4- and ChibiOS-specific code is getting included. Boo.
2015-11-06 09:40:03 -08:00
e049097f49
Remove spurious commented code.
2015-11-06 09:40:03 -08:00
4aae77f565
MatchedFilter improvements
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Use single set of taps for positive and negative filters.
Reverse taps (since new samples are pushed into buffer from the high end).
Make complex multiply explicit to avoid fancy but irrelevant arithmetic checks.
Compute negative filter from conjugation of positive filter taps.
Move filter power and difference calculations into MatchedFilter.
2015-11-06 09:40:03 -08:00
ab28639a3d
Use std::move to move samples in buffer.
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Yes, std::rotate works, but it's fancy and does unnecessary work.
2015-11-06 09:40:02 -08:00
4141d6fe0f
Untemplate MatchedFilter, a different way.
2015-11-06 09:40:02 -08:00
fe94cfa45a
De-std::vector MatchedFilter, was chewing up far too much memory.
2015-11-06 09:40:02 -08:00
64ed539554
Change LinearResampler.advance to external use only.
2015-11-06 09:40:02 -08:00
4ed385d15e
Prioritize PacketBuilder found_end_flag() over packet_truncated().
2015-11-06 09:40:02 -08:00
c2e7f9a6f4
Shorten AIS training sequence match length.
2015-11-06 09:40:02 -08:00
d92c962c0c
Set MatchedFilter taps with separate method.
2015-11-06 09:40:02 -08:00
8198db768d
Move some MatchedFilter code to .cpp file.
2015-11-06 09:40:02 -08:00
aff7865c61
Move (some) AIS bits to a separate file.
2015-11-06 09:40:02 -08:00
7a5100baf1
Enlarge packet payload size 256 -> 1024 bits.
2015-11-06 09:40:01 -08:00
68250b4d30
Expose weight() of FixedErrorFilter.
2015-11-06 09:40:01 -08:00
474eaa8541
Template ClockRecovery for ErrorFilter type.
2015-11-06 09:40:01 -08:00
9879af37d5
FixedErrorFilter constructor.
2015-11-06 09:40:01 -08:00
727d4c8a1f
Const the FixedErrorFilter operator().
2015-11-06 09:40:01 -08:00
93b9b9d9ef
LinearErrorFilter constructor.
2015-11-06 09:40:01 -08:00
37b1d7cf2f
Remove payload_length from PacketBuilder, etc.
2015-11-06 09:40:01 -08:00
cf3bff3b03
Decouple PacketBuilder PayloadHandler function from method type.
2015-11-06 09:40:01 -08:00
1bdad62496
Simplify PacketBuilder pattern matching and symbol accumulation.
2015-11-06 09:40:00 -08:00
36689f5c45
Refactor bit pattern matching.
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Remove AccessCodeCorrelator, Unstuff classes.
2015-11-06 09:40:00 -08:00
f918a774b7
Address implicit cast compiler warnings.
2015-11-06 09:40:00 -08:00
0bc8f551de
Use matched filter for AIS GMSK demodulation demo.
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Less than optimal for plain FSK, but flexible enough to also support GFSK/GMSK. Not at all optimized for SIMD instructions, so may not perform adequately at Bluetooth/GSM rates.
2015-11-06 09:40:00 -08:00
a9c190b6bb
Matched filter implementation.
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Essentially a complex FIR filter that's more flexible than the ones already in the code base. Refactor?!
2015-11-06 09:40:00 -08:00
e9f28f9ef3
Provide configuration of symbol unstuffing.
2015-11-06 09:40:00 -08:00
a00fcbaa8f
Unstuffing pattern length of zero should never match.
2015-11-06 09:40:00 -08:00
05badaddda
Put symbol coding into PacketBuilder.
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Removes stuffing symbols before placing them into packet buffer.
2015-11-06 09:40:00 -08:00
c936e09702
Add bit unstuffing algorithm.
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For use in AIS. Probably useful elsewhere, too...
2015-11-06 09:39:59 -08:00
31ff13f1c0
Un-const Message in message handler interfaces.
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I want to modify in place the messages that are received. Naughty, but oh well.
2015-11-06 09:39:59 -08:00
5c31e803c8
Change interface to AccessCodeCorrelator, inline in header.
2015-11-06 09:39:59 -08:00
a3cce5632e
Complete rewrite of clock recovery, lots of refactoring.
2015-11-06 09:39:59 -08:00
8b2e75a299
Add LinearResampler implementation for clock recovery.
2015-11-06 09:39:59 -08:00
f13e2d32c0
Add symbol coding namespace, NRZI decoder.
2015-11-06 09:39:59 -08:00
934936d3f6
Enhancements to clock recovery
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Linearly interpolate input and delayed samples, based on phase of internal symbol clock.
2015-11-06 09:39:59 -08:00
291de8f869
Change channel_spectrum type to std::complex<float>.
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Move FFT bit-reversal to complex<int16_t> -> complex<float> copy.
Change window so that adjacent bins have constant(-ish) gain.
Change window to float.
Change time domain samples to accumulate at even intervals over the FFT interval.
2015-10-14 11:10:24 -07:00
7f46f0d071
Add tick tracking for all baseband threads.
2015-10-14 10:44:20 -07:00
e2bb77d756
Change wideband FFT bin filter, clean up code a bit.
2015-09-02 11:29:38 -07:00
c4de9c4423
Mute audio whenever baseband mode is changed.
2015-09-01 21:05:47 -07:00
c52de7abe6
Clean up baseband/RSSI streaming control.
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Address hang-up of baseband and RSSI when switching modulation modes really fast.
2015-09-01 21:05:32 -07:00
5d8c636f40
Halt M4 right after sending M0 the shutdown message.
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Addresses issue #55 .
2015-09-01 13:49:09 -07:00
3fea68d777
Adjust wideband specan gain to match other modes.
2015-08-27 14:57:05 -07:00
b13081696d
Simplify MessageQueue pop() usage.
2015-08-27 14:35:17 -07:00
d8b3b4cb6b
Check queue empty only once when reading messages.
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There was a second is_empty() call hidden in the pop() call, so the while(condition) was redundant.
2015-08-27 14:27:29 -07:00
e751e10e45
Add wideband spectrum processor.
2015-08-27 13:57:31 -07:00
23ac04ad56
Make channel spectrum members protected, not private.
2015-08-27 13:51:55 -07:00
c7907e948c
Extract FSKProcessor into separate files.
2015-08-27 13:31:39 -07:00
ffe829cf67
Extract WidebandFMAudio into separate files.
2015-08-27 13:19:34 -07:00
7c5db55f8f
Extract NarrowbandFMAudio into separate files.
2015-08-27 13:14:45 -07:00
e246ea2c39
Extract NarrowbandAMAudio class into separate files.
2015-08-27 13:07:07 -07:00
Jared Boone