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FT4 demod: copy original FT8 worker to FT4. Isolate AI generated classes

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f4exb 2026-03-07 11:57:08 +01:00
parent 724a9a0f83
commit fbfa04a06d
9 changed files with 4433 additions and 90 deletions
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3720
ft8/ft4.cpp
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632
ft8/ft4.h
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@ -17,8 +17,163 @@ class QThread;
namespace FT8 {
// 1920-point FFT at 12000 samples/second
// 6.25 Hz spacing, 0.16 seconds/symbol
// encode chain:
// 77 bits
// append 14 bits CRC (for 91 bits)
// LDPC(174,91) yields 174 bits
// that's 58 3-bit FSK-8 symbols
// gray code each 3 bits
// insert three 7-symbol Costas sync arrays
// at symbol #s 0, 36, 72 of final signal
// thus: 79 FSK-8 symbols
// total transmission time is 12.64 seconds
// tunable parameters
class FT8_API FT4Params
{
public:
int nthreads; // number of parallel threads, for multi-core
int npasses_one; // number of spectral subtraction passes
int npasses_two; // number of spectral subtraction passes
int ldpc_iters; // how hard LDPC decoding should work
int snr_win; // averaging window, in symbols, for SNR conversion
int snr_how; // technique to measure "N" for SNR. 0 means median of the 8 tones.
float shoulder200; // for 200 sps bandpass filter
float shoulder200_extra; // for bandpass filter
float second_hz_win; // +/- hz
int second_hz_n; // divide total window into this many pieces
float second_off_win; // +/- search window in symbol-times
int second_off_n;
int third_hz_n;
float third_hz_win;
int third_off_n;
float third_off_win;
float log_tail;
float log_rate;
int problt_how_noise;
int problt_how_sig;
int use_apriori;
int use_hints; // 1 means use all hints, 2 means just CQ hints
int win_type;
int use_osd;
int osd_depth; // 6; // don't increase beyond 6, produces too much garbage
int osd_ldpc_thresh; // demand this many correct LDPC parity bits before OSD
int ncoarse; // number of offsets per hz produced by coarse()
int ncoarse_blocks;
float tminus; // start looking at 0.5 - tminus seconds
float tplus;
int coarse_off_n;
int coarse_hz_n;
float already_hz;
float overlap;
int overlap_edges;
float nyquist;
int oddrate;
float pass0_frac;
int reduce_how;
float go_extra;
int do_reduce;
int pass_threshold;
int strength_how;
int known_strength_how;
int coarse_strength_how;
float reduce_shoulder;
float reduce_factor;
float reduce_extra;
float coarse_all;
int second_count;
int soft_phase_win;
float subtract_ramp;
int soft_ones;
int soft_pairs;
int soft_triples;
int do_second;
int do_fine_hz;
int do_fine_off;
int do_third;
float fine_thresh;
int fine_max_off;
int fine_max_tone;
int known_sparse;
float c_soft_weight;
int c_soft_win;
int bayes_how;
FT4Params()
{
nthreads = 8; // number of parallel threads, for multi-core
npasses_one = 3; // number of spectral subtraction passes
npasses_two = 3; // number of spectral subtraction passes
ldpc_iters = 25; // how hard LDPC decoding should work
snr_win = 7; // averaging window, in symbols, for SNR conversion
snr_how = 3; // technique to measure "N" for SNR. 0 means median of the 8 tones.
shoulder200 = 10; // for 200 sps bandpass filter
shoulder200_extra = 0.0; // for bandpass filter
second_hz_win = 3.5; // +/- hz
second_hz_n = 8; // divide total window into this many pieces
second_off_win = 0.5; // +/- search window in symbol-times
second_off_n = 10;
third_hz_n = 3;
third_hz_win = 0.25;
third_off_n = 4;
third_off_win = 0.075;
log_tail = 0.1;
log_rate = 8.0;
problt_how_noise = 0; // Gaussian
problt_how_sig = 0; // Gaussian
use_apriori = 1;
use_hints = 2; // 1 means use all hints, 2 means just CQ hints
win_type = 1;
use_osd = 1;
osd_depth = 0; // 6; // don't increase beyond 6, produces too much garbage
osd_ldpc_thresh = 70; // demand this many correct LDPC parity bits before OSD
ncoarse = 1; // number of offsets per hz produced by coarse()
ncoarse_blocks = 1;
tminus = 2.2; // start looking at 0.5 - tminus seconds
tplus = 2.4;
coarse_off_n = 4;
coarse_hz_n = 4;
already_hz = 27;
overlap = 20;
overlap_edges = 0;
nyquist = 0.925;
oddrate = 1;
pass0_frac = 1.0;
reduce_how = 2;
go_extra = 3.5;
do_reduce = 1;
pass_threshold = 1;
strength_how = 4;
known_strength_how = 7;
coarse_strength_how = 6;
reduce_shoulder = -1;
reduce_factor = 0.25;
reduce_extra = 0;
coarse_all = -1;
second_count = 3;
soft_phase_win = 2;
subtract_ramp = 0.11;
soft_ones = 2;
soft_pairs = 1;
soft_triples = 1;
do_second = 1;
do_fine_hz = 1;
do_fine_off = 1;
do_third = 2;
fine_thresh = 0.19;
fine_max_off = 2;
fine_max_tone = 4;
known_sparse = 1;
c_soft_weight = 7;
c_soft_win = 2;
bayes_how = 1;
}
}; // class FT4Params
class FT8_API FT4ParamsLight
{
public:
int nthreads;
int ldpc_iters;
@ -27,7 +182,7 @@ public:
int osd_ldpc_thresh;
int max_candidates;
FT4Params() :
FT4ParamsLight() :
nthreads(8),
ldpc_iters(25),
use_osd(1),
@ -37,9 +192,473 @@ public:
{}
};
class FT8_API FT4Decoder : public QObject
// The FT8 worker
class FT8_API FT4 : public QObject
{
Q_OBJECT
public:
FT4(
const std::vector<float> &samples,
float min_hz,
float max_hz,
int start,
int rate,
int hints1[],
int hints2[],
double deadline,
double final_deadline,
CallbackInterface *cb,
std::vector<cdecode> prevdecs,
FFTEngine *fftEngine
);
~FT4();
// Number of passes
void set_npasses(int npasses) { npasses_ = npasses; }
// Start the worker
void start_work();
// strength of costas block of signal with tone 0 at bi0,
// and symbol zero at si0.
float one_coarse_strength(const FFTEngine::ffts_t &bins, int bi0, int si0);
// return symbol length in samples at the given rate.
// insist on integer symbol lengths so that we can
// use whole FFT bins.
int blocksize(int rate);
//
// look for potential signals by searching FFT bins for Costas symbol
// blocks. returns a vector of candidate positions.
//
std::vector<Strength> coarse(const FFTEngine::ffts_t &bins, int si0, int si1);
FT4Params& getParams() { return params; }
//
// given log likelihood for each bit, try LDPC and OSD decoders.
// on success, puts corrected 174 bits into a174[].
//
static int decode(const float ll174[], int a174[], FT4Params& params, int use_osd, std::string &comment);
// encode a 77 bit message into a 174 bit payload
// adds the 14 bit CRC to obtain 91 bits
// apply (174, 91) generator mastrix to obtain the 83 parity bits
// append the 83 bits to the 91 bits message e+ crc to obtain the 174 bit payload
static void encode(int a174[], const int s77[]);
//
// set ones and zero symbol indexes
//
static void set_ones_zeroes(int ones[], int zeroes[], int nbBits, int bitIndex);
//
// mags is the vector of 2^nbSymbolBits vector of magnitudes at each symbol time
// ll174 is the resulting 174 soft bits of payload
// used in FT-chirp modulation scheme - generalized to any number of symbol bits
//
static void soft_decode_mags(FT4Params& params, const std::vector<std::vector<float>>& mags, int nbSymbolBits, float ll174[]);
//
// Generic Gray decoding for magnitudes (floats)
//
static std::vector<std::vector<float>> un_gray_code_r_gen(const std::vector<std::vector<float>> &mags);
private:
//
// reduce the sample rate from arate to brate.
// center hz0..hz1 in the new nyquist range.
// but first filter to that range.
// sets delta_hz to hz moved down.
//
std::vector<float> reduce_rate(
const std::vector<float> &a,
float hz0,
float hz1,
int arate,
int brate,
float &delta_hz
);
// The actual main process
void go(int npasses);
//
// what's the strength of the Costas sync blocks of
// the signal starting at hz and off?
//
float one_strength(const std::vector<float> &samples200, float hz, int off);
//
// given a complete known signal's symbols in syms,
// how strong is it? used to look for the best
// offset and frequency at which to subtract a
// decoded signal.
//
float one_strength_known(
const std::vector<float> &samples,
int rate,
const std::vector<int> &syms,
float hz,
int off
);
int search_time_fine(
const std::vector<float> &samples200,
int off0,
int offN,
float hz,
int gran,
float &str
);
int search_time_fine_known(
const std::vector<std::complex<float>> &bins,
int rate,
const std::vector<int> &syms,
int off0,
int offN,
float hz,
int gran,
float &str
);
//
// search for costas blocks in an MxN time/frequency grid.
// hz0 +/- hz_win in hz_inc increments. hz0 should be near 25.
// off0 +/- off_win in off_inc incremenents.
//
std::vector<Strength> search_both(
const std::vector<float> &samples200,
float hz0,
int hz_n,
float hz_win,
int off0,
int off_n,
int off_win
);
void search_both_known(
const std::vector<float> &samples,
int rate,
const std::vector<int> &syms,
float hz0,
float off_secs0, // seconds
float &hz_out,
float &off_out
);
//
// shift frequency by shifting the bins of one giant FFT.
// so no problem with phase mismatch &c at block boundaries.
// surprisingly fast at 200 samples/second.
// shifts *down* by hz.
//
std::vector<float> fft_shift(
const std::vector<float> &samples,
int off,
int len,
int rate,
float hz
);
//
// shift down by hz.
//
std::vector<float> fft_shift_f(
const std::vector<std::complex<float>> &bins,
int rate,
float hz
);
// shift the frequency by a fraction of 6.25,
// to center hz on bin 4 (25 hz).
std::vector<float> shift200(
const std::vector<float> &samples200,
int off,
int len,
float hz
);
// returns a mini-FFT of 79 8-tone symbols.
FFTEngine::ffts_t extract(const std::vector<float> &samples200, float, int off);
//
// m79 is a 79x8 array of complex.
//
FFTEngine::ffts_t un_gray_code_c(const FFTEngine::ffts_t &m79);
//
// m79 is a 79x8 array of float.
//
std::vector<std::vector<float>> un_gray_code_r(const std::vector<std::vector<float>> &m79);
//
// normalize levels by windowed median.
// this helps, but why?
//
std::vector<std::vector<float>> convert_to_snr(const std::vector<std::vector<float>> &m79);
//
// normalize levels by windowed median.
// this helps, but why?
//
static std::vector<std::vector<float>> convert_to_snr_gen(const FT4Params& params, int nbSymbolBits, const std::vector<std::vector<float>> &mags);
//
// normalize levels by windowed median.
// this helps, but why?
//
std::vector<std::vector<std::complex<float>>> c_convert_to_snr(
const std::vector<std::vector<std::complex<float>>> &m79
);
//
// statistics to decide soft probabilities,
// to drive LDPC decoder.
// distribution of strongest tones, and
// distribution of noise.
//
static void make_stats(
const std::vector<std::vector<float>> &m79,
Stats &bests,
Stats &all
);
//
// generalized version of the above for any number of symbols and no Costas
// used by FT-chirp decoder
//
static void make_stats_gen(
const std::vector<std::vector<float>> &mags,
int nbSymbolBits,
Stats &bests,
Stats &all
);
//
// convert 79x8 complex FFT bins to magnitudes.
//
// exploits local phase coherence by decreasing magnitudes of bins
// whose phase is far from the phases of nearby strongest tones.
//
// relies on each tone being reasonably well centered in its FFT bin
// (in time and frequency) so that each tone completes an integer
// number of cycles and thus preserves phase from one symbol to the
// next.
//
std::vector<std::vector<float>> soft_c2m(const FFTEngine::ffts_t &c79);
//
// guess the probability that a bit is zero vs one,
// based on strengths of strongest tones that would
// give it those values. for soft LDPC decoding.
//
// returns log-likelihood, zero is positive, one is negative.
//
static float bayes(
FT4Params& params,
float best_zero,
float best_one,
int lli,
Stats &bests,
Stats &all
);
//
// c79 is 79x8 complex tones, before un-gray-coding.
//
void soft_decode(const FFTEngine::ffts_t &c79, float ll174[]);
//
// c79 is 79x8 complex tones, before un-gray-coding.
//
void c_soft_decode(const FFTEngine::ffts_t &c79x, float ll174[]);
//
// turn 79 symbol numbers into 174 bits.
// strip out the three Costas sync blocks,
// leaving 58 symbol numbers.
// each represents three bits.
// (all post-un-gray-code).
// str is per-symbol strength; must be positive.
// each returned element is < 0 for 1, > 0 for zero,
// scaled by str.
//
std::vector<float> extract_bits(const std::vector<int> &syms, const std::vector<float> str);
// decode successive pairs of symbols. exploits the likelihood
// that they have the same phase, by summing the complex
// correlations for each possible pair and using the max.
void soft_decode_pairs(
const FFTEngine::ffts_t &m79x,
float ll174[]
);
void soft_decode_triples(
const FFTEngine::ffts_t &m79x,
float ll174[]
);
//
// bandpass filter some FFT bins.
// smooth transition from stop-band to pass-band,
// so that it's not a brick-wall filter, so that it
// doesn't ring.
//
std::vector<std::complex<float>> fbandpass(
const std::vector<std::complex<float>> &bins0,
float bin_hz,
float low_outer, // start of transition
float low_inner, // start of flat area
float high_inner, // end of flat area
float high_outer // end of transition
);
//
// move hz down to 25, filter+convert to 200 samples/second.
//
// like fft_shift(). one big FFT, move bins down and
// zero out those outside the band, then IFFT,
// then re-sample.
//
// XXX maybe merge w/ fft_shift() / shift200().
//
std::vector<float> down_v7(const std::vector<float> &samples, float hz);
std::vector<float> down_v7_f(const std::vector<std::complex<float>> &bins, int len, float hz);
//
// putative start of signal is at hz and symbol si0.
//
// return 2 if it decodes to a brand-new message.
// return 1 if it decodes but we've already seen it,
// perhaps in a different pass.
// return 0 if we could not decode.
//
// XXX merge with one_iter().
//
int one_merge(const std::vector<std::complex<float>> &bins, int len, float hz, int off);
// return 2 if it decodes to a brand-new message.
// return 1 if it decodes but we've already seen it,
// perhaps in a different pass.
// return 0 if we could not decode.
int one_iter(const std::vector<float> &samples200, int best_off, float hz_for_cb);
//
// estimate SNR, yielding numbers vaguely similar to WSJT-X.
// m79 is a 79x8 complex FFT output.
//
float guess_snr(const FFTEngine::ffts_t &m79);
//
// compare phases of successive symbols to guess whether
// the starting offset is a little too high or low.
// we expect each symbol to have the same phase.
// an error in causes the phase to advance at a steady rate.
// so if hz is wrong, we expect the phase to advance
// or retard at a steady pace.
// an error in offset causes each symbol to start at
// a phase that depends on the symbol's frequency;
// a particular offset error causes a phase error
// that depends on frequency.
// hz0 is actual FFT bin number of m79[...][0] (always 4).
//
// the output adj_hz is relative to the FFT bin center;
// a positive number means the real signal seems to be
// a bit higher in frequency that the bin center.
//
// adj_off is the amount to change the offset, in samples.
// should be subtracted from offset.
//
void fine(const FFTEngine::ffts_t &m79, int, float &adj_hz, float &adj_off);
//
// subtract a corrected decoded signal from nsamples_,
// perhaps revealing a weaker signal underneath,
// to be decoded in a subsequent pass.
//
// re79[] holds the error-corrected symbol numbers.
//
void subtract(
const std::vector<int> re79,
float hz0,
float hz1,
float off_sec
);
//
// decode, give to callback, and subtract.
//
// return 2 if it decodes to a brand-new message.
// return 1 if it decodes but we've already seen it,
// perhaps in a different pass.
// return 0 if we could not decode.
//
int try_decode(
const std::vector<float> &samples200,
float ll174[174],
float best_hz,
int best_off_samples,
float hz0_for_cb,
float,
int use_osd,
const char *comment1,
const FFTEngine::ffts_t &m79
);
//
// given 174 bits corrected by LDPC, work
// backwards to the symbols that must have
// been sent.
// used to help ensure that subtraction subtracts
// at the right place.
//
std::vector<int> recode(int a174[]);
//
// the signal is at roughly 25 hz in samples200.
//
// return 2 if it decodes to a brand-new message.
// return 1 if it decodes but we've already seen it,
// perhaps in a different pass.
// return 0 if we could not decode.
//
int one_iter1(
const std::vector<float> &samples200x,
int best_off,
float best_hz,
float hz0_for_cb,
float hz1_for_cb
);
signals:
void finished();
private:
FT4Params params;
FFTEngine *fftEngine_;
int npasses_;
static const double apriori174[];
float min_hz_;
float max_hz_;
std::vector<float> samples_; // input to each pass
std::vector<float> nsamples_; // subtract from here
int start_; // sample number of 0.5 seconds into samples[]
int rate_; // samples/second
double deadline_; // start time + budget
double final_deadline_; // keep going this long if no decodes
std::vector<int> hints1_;
std::vector<int> hints2_;
int pass_;
float down_hz_;
QMutex cb_mu_;
CallbackInterface *cb_; // call-back interface
QMutex hack_mu_;
int hack_size_;
int hack_off_;
int hack_len_;
float hack_0_;
float hack_1_;
const float *hack_data_;
std::vector<std::complex<float>> hack_bins_;
std::vector<cdecode> prevdecs_;
}; // class FT4
class FT8_API FT4DecoderLight : public QObject
{
Q_OBJECT
public:
~FT4DecoderLight();
void entry(
float xsamples[],
int nsamples,
int start,
int rate,
float min_hz,
float max_hz,
int hints1[],
int hints2[],
double time_left,
double total_time_left,
CallbackInterface *cb,
int,
struct cdecode *
);
void wait(double time_left);
void forceQuit();
FT4ParamsLight& getParams() { return params; }
private:
FT4ParamsLight params;
std::vector<QThread*> threads;
};
class FT8_API FT4Decoder : public QObject {
Q_OBJECT
public:
~FT4Decoder();
void entry(
@ -57,14 +676,15 @@ public:
int,
struct cdecode *
);
void wait(double time_left);
void forceQuit();
void wait(double time_left); //!< wait for all threads to finish
void forceQuit(); //!< force quit all threads
FT4Params& getParams() { return params; }
private:
FT4Params params;
std::vector<QThread*> threads;
};
std::vector<FFTEngine*> fftEngines;
}; // FT4Decoder
} // namespace FT8

14
ft8/ft4worker.cpp
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@ -62,7 +62,7 @@ FT4Worker::FT4Worker(
int start,
int rate,
CallbackInterface *cb,
const FT4Params& params
const FT4ParamsLight& params
) :
m_samples(samples),
m_minHz(minHz),
@ -369,6 +369,7 @@ void FT4Worker::decode()
int plain[174];
int ldpcOk = 0;
int correct_bits = 0;
LDPC::ldpc_decode(llr.data(), m_params.ldpc_iters, plain, &ldpcOk);
if (ldpcOk < ldpcThreshold)
@ -378,8 +379,15 @@ void FT4Worker::decode()
int a174[174];
for (int i = 0; i < 174; i++) {
for (int i = 0; i < 174; i++)
{
a174[i] = plain[i];
if (llr.data()[i] < 0 && a174[i] == 1) {
correct_bits += 1;
} else if (llr.data()[i] > 0 && a174[i] == 0) {
correct_bits += 1;
}
}
bool crcOk = OSD::check_crc(a174);
@ -420,7 +428,7 @@ void FT4Worker::decode()
}
const float off = static_cast<float>(m_start) / m_rate + static_cast<float>(candidate.start) / m_rate;
m_cb->hcb(a91, tone0, off, "FT4-EXP", snr, 0, ldpcOk);
m_cb->hcb(a91, tone0, off, "FT4-EXP", snr, 0, correct_bits);
}
}

4
ft8/ft4worker.h
View File

@ -40,7 +40,7 @@ public:
int start,
int rate,
CallbackInterface *cb,
const FT4Params& params
const FT4ParamsLight& params
);
void start_work();
@ -59,7 +59,7 @@ private:
int m_start;
int m_rate;
CallbackInterface *m_cb;
FT4Params m_params;
FT4ParamsLight m_params;
FFTEngine m_fftEngine;
};

72
ft8/ft8.cpp
View File

@ -47,78 +47,6 @@
namespace FT8 {
//
// return a Hamming window of length n.
//
std::vector<float> hamming(int n)
{
std::vector<float> h(n);
for (int k = 0; k < n; k++) {
h[k] = 0.54 - 0.46 * cos(2 * M_PI * k / (n - 1.0));
}
return h;
}
//
// blackman window
//
std::vector<float> blackman(int n)
{
std::vector<float> h(n);
for (int k = 0; k < n; k++) {
h[k] = 0.42 - 0.5 * cos(2 * M_PI * k / n) + 0.08 * cos(4 * M_PI * k / n);
}
return h;
}
//
// symmetric blackman window
//
std::vector<float> sym_blackman(int n)
{
std::vector<float> h(n);
for (int k = 0; k < (n / 2) + 1; k++) {
h[k] = 0.42 - 0.5 * cos(2 * M_PI * k / n) + 0.08 * cos(4 * M_PI * k / n);
}
for (int k = n - 1; k >= (n / 2) + 1; --k) {
h[k] = h[(n - 1) - k];
}
return h;
}
//
// blackman-harris window
//
std::vector<float> blackmanharris(int n)
{
float a0 = 0.35875;
float a1 = 0.48829;
float a2 = 0.14128;
float a3 = 0.01168;
std::vector<float> h(n);
for (int k = 0; k < n; k++)
{
// symmetric
h[k] = a0 - a1 * cos(2 * M_PI * k / (n - 1)) + a2 * cos(4 * M_PI * k / (n - 1)) - a3 * cos(6 * M_PI * k / (n - 1));
// periodic
// h[k] =
// a0
// - a1 * cos(2 * M_PI * k / n)
// + a2 * cos(4 * M_PI * k / n)
// - a3 * cos(6 * M_PI * k / n);
}
return h;
}
// a-priori probability of each of the 174 LDPC codeword
// bits being one. measured from reconstructed correct
// codewords, into ft8bits, then python bprob.py.

72
ft8/util.cpp
View File

@ -338,4 +338,76 @@ std::string trim(const std::string &s) {
return rtrim(ltrim(s));
}
//
// return a Hamming window of length n.
//
std::vector<float> hamming(int n)
{
std::vector<float> h(n);
for (int k = 0; k < n; k++) {
h[k] = 0.54 - 0.46 * cos(2 * M_PI * k / (n - 1.0));
}
return h;
}
//
// blackman window
//
std::vector<float> blackman(int n)
{
std::vector<float> h(n);
for (int k = 0; k < n; k++) {
h[k] = 0.42 - 0.5 * cos(2 * M_PI * k / n) + 0.08 * cos(4 * M_PI * k / n);
}
return h;
}
//
// symmetric blackman window
//
std::vector<float> sym_blackman(int n)
{
std::vector<float> h(n);
for (int k = 0; k < (n / 2) + 1; k++) {
h[k] = 0.42 - 0.5 * cos(2 * M_PI * k / n) + 0.08 * cos(4 * M_PI * k / n);
}
for (int k = n - 1; k >= (n / 2) + 1; --k) {
h[k] = h[(n - 1) - k];
}
return h;
}
//
// blackman-harris window
//
std::vector<float> blackmanharris(int n)
{
float a0 = 0.35875;
float a1 = 0.48829;
float a2 = 0.14128;
float a3 = 0.01168;
std::vector<float> h(n);
for (int k = 0; k < n; k++)
{
// symmetric
h[k] = a0 - a1 * cos(2 * M_PI * k / (n - 1)) + a2 * cos(4 * M_PI * k / (n - 1)) - a3 * cos(6 * M_PI * k / (n - 1));
// periodic
// h[k] =
// a0
// - a1 * cos(2 * M_PI * k / n)
// + a2 * cos(4 * M_PI * k / n)
// - a3 * cos(6 * M_PI * k / n);
}
return h;
}
} // namespace FT8

5
ft8/util.h
View File

@ -50,6 +50,11 @@ std::vector<float> gfsk_r(
std::vector<float> gfsk_window(int samples_per_symbol, float b);
std::string trim(const std::string &s);
std::vector<float> hamming(int n); // return a Hamming window of length n.
std::vector<float> blackman(int n); // blackman window
std::vector<float> sym_blackman(int n); // symmetric blackman window
std::vector<float> blackmanharris(int n); // blackman-harris window
typedef unsigned long ulong;
typedef unsigned int uint;

2
plugins/channelrx/demodft8/ft8demodworker.h
View File

@ -112,7 +112,7 @@ private:
bool m_invalidSequence;
qint64 m_baseFrequency;
FT8::FT8Decoder m_ft8Decoder;
FT8::FT4Decoder m_ft4Decoder;
FT8::FT4DecoderLight m_ft4Decoder;
FT8::Packing m_packing;
MessageQueue *m_guiReportingMessageQueue;
MessageQueue *m_pskReportingMessageQueue;

2
sdrbench/test_ft4.cpp
View File

@ -216,7 +216,7 @@ void MainBench::testFT4(const QString& wavFile, const QString& argsStr)
wfile.close();
FT8::FT4Decoder decoder;
FT8::FT4DecoderLight decoder;
decoder.getParams().nthreads = nthreads;
decoder.getParams().use_osd = 1;
decoder.getParams().osd_depth = 6;