From 53a3be97d2ccdac43482206f05128960a1f7f387 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C4=81rlis=20Goba?= <karlis.goba@gmail.com>
Date: Thu, 18 Oct 2018 11:43:51 +0300
Subject: [PATCH] Added explanatory comments

---
 gen_ft8.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/gen_ft8.cpp b/gen_ft8.cpp
index 66b3106..3903006 100644
--- a/gen_ft8.cpp
+++ b/gen_ft8.cpp
@@ -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;
-}
\ No newline at end of file
+}