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minimodem auto-set tones per baud-rate

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This commit is contained in:
Kamal Mostafa 2011-05-29 12:44:10 -07:00
parent f9085e84cb
commit d1ce25db02
1 changed files with 21 additions and 10 deletions
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31
src/minimodem.c
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@ -44,13 +44,6 @@ int main(int argc, char*argv[]) {
/*
* Bell 103: mark=1270 space=1070
* ITU-T V.21: mark=1280 space=1080
*/
unsigned int bfsk_mark_f = 1270;
unsigned int bfsk_space_f = 1070;
if ( argc < 2 ) { if ( argc < 2 ) {
fprintf(stderr, "usage: minimodem baud_rate [ mark_hz space_hz ]\n"); fprintf(stderr, "usage: minimodem baud_rate [ mark_hz space_hz ]\n");
return 1; return 1;
@ -65,6 +58,27 @@ int main(int argc, char*argv[]) {
unsigned int decode_rate = atoi(argv[argi++]); unsigned int decode_rate = atoi(argv[argi++]);
unsigned int band_width;
band_width = decode_rate;
/*
* Bell 103: baud=300 mark=1270 space=1070
* ITU-T V.21: baud=300 mark=1280 space=1080
*/
unsigned int bfsk_mark_f = 1270;
unsigned int bfsk_space_f = 1070;
band_width = 10;
// band_width = 50; /* close enough? */
/*
* Bell 202: baud=1200 mark=1200 space=2200
*/
if ( decode_rate >= 400 ) {
bfsk_mark_f = 1200;
bfsk_space_f = 2200;
band_width = 200;
}
if ( argi < argc ) { if ( argi < argc ) {
assert(argc-argi == 2); assert(argc-argi == 2);
bfsk_mark_f = atoi(argv[argi++]); bfsk_mark_f = atoi(argv[argi++]);
@ -73,9 +87,6 @@ int main(int argc, char*argv[]) {
unsigned int sample_rate = ss.rate; unsigned int sample_rate = ss.rate;
unsigned int band_width = decode_rate / 2;
// unsigned int band_width = decode_rate;
unsigned int bfsk_mark_band = (bfsk_mark_f +(float)band_width/2) / band_width; unsigned int bfsk_mark_band = (bfsk_mark_f +(float)band_width/2) / band_width;
unsigned int bfsk_space_band = (bfsk_space_f +(float)band_width/2) / band_width; unsigned int bfsk_space_band = (bfsk_space_f +(float)band_width/2) / band_width;