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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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ft8/ft8.cpp
-72
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@@ -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.