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minimodem cleanup

This commit is contained in:
Kamal Mostafa 2011-06-21 14:01:16 -07:00
parent 118722249b
commit e1b8082e4c
1 changed files with 6 additions and 5 deletions
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11
src/minimodem.c
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@ -522,7 +522,8 @@ main( int argc, char*argv[] )
// FIXME: explain
unsigned int try_max_nsamples = nsamples_per_bit;
unsigned int try_step_nsamples = nsamples_per_bit / 8;
#define FSK_ANALYZE_NSTEPS 8 /* accuracy vs. performance */
unsigned int try_step_nsamples = nsamples_per_bit / FSK_ANALYZE_NSTEPS;
if ( try_step_nsamples == 0 )
try_step_nsamples = 1;
@ -591,14 +592,14 @@ main( int argc, char*argv[] )
* but not past the stop bit, since we want it to appear as
* the prev_stop bit of the next frame, so ...
*
* advance = 1 prev_stop + 1 start + 8 data bits == 10 bits
* advance = 1 prev_stop + 1 start + N data bits == n_data_bits+2
*
* but actually advance just a bit less than that to allow
* for clock skew, so ...
*
* advance = 9.5 bits */
*/
#define FSK_SCAN_LAG 0.5
advance = frame_start_sample +
nsamples_per_bit * (float)(fskp->n_data_bits + 1.5);
nsamples_per_bit * (float)(fskp->n_data_bits + 2 - FSK_SCAN_LAG);
debug_log("@ nsamples_per_bit=%.3f n_data_bits=%u "
" frame_start=%u advance=%u\n",