kopia lustrzana https://github.com/ag1le/morse-wip
75 wiersze
3.1 KiB
Plaintext
75 wiersze
3.1 KiB
Plaintext
(C) 2013,2014 AG1LE Mauri Niininen
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2014-JAN-02
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New release bmorse-0.1.01
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Added FFT filtering code from FLDIGI cw.cxx and fftflt.cxx
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Converted all files from C to C++.
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Found a workaround for P(max) bug - see Sept 26. Adjusting dur[] initialization value from 1000.0 to 9000.0 in proces.cxx worked in most test files so far.
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2013-DEC-29
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Added more options to enable debugging and testing bmorse decoder while using WAV audio files as source.
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Bit filter (-bfv) option does envelope smoothing - 10 msec rise time assumption based on experiences with FLDIGI.
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Plot option (-plt) enables piping such as "bmorse -plt <sndfile> | xplot" to visualize the CW envelope.
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AGC option (-agc) has fast rise and slow decay in case original signal has very large dynamic range.
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AMP option (-amp) allows to multiply envelope signal with a constant.
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DUR option (-dur) allows manually to set Bayesian decoder sample duration (used in path.c).
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FFT option (-fft) enables either FFT based signal recovery or just low pass filtering.
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- FFT has also peak_detection() to find if there are multiple signals in the audio frequency range.
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- Parameter "delta" sets peak detection threshold
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- Width (-wid) and length (-len) parameters can be used to set FFT size and chunking
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2013-DEC-28
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Renamed this program as "bmorse" - it stands for Bayesian Morse code decoder.
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Built new functionality and options for testing both sound files and text files.
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2013-SEP-26
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enabled decoding from FLDIGI data feed. clamping x value to 1.0 max as FLDIGI sends values over 20.0 during startup before AGC kicks in.
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BUG: P(dah) abruptly goes from near 1.0 down and the bounces back => P(max) jumps to huge values
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too long dahs?
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2013-SEP-25
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BUG: missing word space /pause between words QUICK BROWN when < 30 db SNR ?
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FOUND: enabled noise.c processing in morse.c
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changed to:
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noise_(&x, &rn, &zout);
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retstat = proces_(&zout, &rn, &xhat, &px, &elmhat, &spdhat, &imax, &pmax);
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much better decoding with low SNR test signals.
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2013-SEP-25
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run "./morse t test/test20db.in | less"
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BUG: QUICD and FOB when high 20 dB SNR?
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D should be K and B should be X
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for some reason last 'dah' following word space gets decoded as 'dit'.
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FOUND: Initl.c - line 123 1, 1, 0, 0, 0, 0, // mauri 2013-09-25 bugfix
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had 0 instead of 1 in state k=4
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2013-SEP-02 Morse decoding works on C++ version. Added decoding struct TREE in transl.c
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and logic to translate incoming morse symbols. This is marked as version v01.
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2013-SEP-01 Initial version. Original Fortran sources compiled with
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gfortran -g *.f
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produces a.out executable program.
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Based on initial testing the element state estimation works, but translating letters
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has still problems. Produces a sequence of letter states but translation to actual
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characters produces incorrect letters.
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Compilation of C-sources produced by f2c is done with following commands:
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gcc -c *.c
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gcc *.o -lf2c -lm
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produces a.out executable program. The output of both versions of a.out is in
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output_c.txt
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output_f.txt
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These have minor differences - source still unknown.
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