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fsk: AVOID_TRANSIENTS noise limiter re-enabled 

Algo #5 needs this, just as #3 did.
This commit is contained in:
Kamal Mostafa 2012-08-18 19:15:33 -07:00
parent 076343a9c3
commit e1b055cf4f
1 changed files with 4 additions and 5 deletions
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9
src/fsk.c
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@ -238,17 +238,16 @@ fsk_frame_analyze( fsk_plan *fskp, float *samples, float samples_per_bit,
}
// Note: CONFIDENCE_ALGO 3 does not need AVOID_TRANSIENTS
// #define AVOID_TRANSIENTS 0.7
#define AVOID_TRANSIENTS 0.7
//
#ifdef AVOID_TRANSIENTS
/* Compare strength of stop bit and start bit, to avoid detecting
* a transient as a start bit, as often results in a single false
* character when the mark "leader" tone begins. Require that the
* diff between start bit and stop bit strength not be "large". */
//float i_str = bit_strengths[0];
float s_str = bit_strengths[1];
float p_str = bit_strengths[fskp->n_data_bits + 2];
if ( fabs(s_str-p_str) > (s_str * AVOID_TRANSIENTS) ) {
float s_mag = bit_sig_mags[1];
float p_mag = bit_sig_mags[fskp->n_data_bits + 2];
if ( fabs(s_mag-p_mag) > (s_mag * AVOID_TRANSIENTS) ) {
debug_log(" avoid transient\n");
return 0.0;
}