rpitx/ft8_lib
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Added explanatory comments

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Kārlis Goba 2018-10-18 11:43:51 +03:00 committed by GitHub
parent b65bad8ef0
commit 53a3be97d2
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1 changed files with 5 additions and 3 deletions
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gen_ft8.cpp
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@ -165,10 +165,10 @@ int main(int argc, char **argv) {
return -1;
}
//const char *message = "G0UPL YL3JG 73";
const char *message = argv[1];
const char *wav_path = argv[2];
// First, pack the text data into 72-bit binary message
uint8_t packed[9];
int rc = packmsg(message, packed);
if (rc < 0) {
@ -183,7 +183,8 @@ int main(int argc, char **argv) {
}
printf("\n");
uint8_t tones[NN];
// Second, encode the binary message as a sequence of FSK tones
uint8_t tones[NN]; // NN = 79, lack of better name at the moment
genft8(packed, 0, tones);
printf("FSK tones: ");
@ -192,6 +193,7 @@ int main(int argc, char **argv) {
}
printf("\n");
// Third, convert the FSK tones into an audio signal
const int num_samples = (int)(0.5 + NN / 6.25 * 12000);
const int num_silence = (15 * 12000 - num_samples) / 2;
float signal[num_silence + num_samples + num_silence];
@ -203,4 +205,4 @@ int main(int argc, char **argv) {
save_wav(signal, num_silence + num_samples + num_silence, 12000, wav_path);
return 0;
}
}