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B-Netz: Use standard deviation to determine if an FSK frame is valid or not

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This commit is contained in:
Andreas Eversberg
2017-08-13 14:15:53 +02:00
parent 41bd9999b1
commit ee61c4362b
3 changed files with 22 additions and 10 deletions
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10
src/bnetz/bnetz.c
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@@ -445,21 +445,23 @@ void bnetz_receive_tone(bnetz_t *bnetz, int bit)
}
/* A digit was received. */
void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double level, double quality)
void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double level_avg, double level_dev, double quality_avg)
{
struct impulstelegramm *it;
int digit = 0;
/* drop any telegramm that is too bad */
if (quality < 0.2)
if (level_dev / level_avg > 0.2)
return;
PDEBUG_CHAN(DDSP, DEBUG_INFO, "RX Level: average=%.0f%% deviation=%.0f%% Quality: %.0f%%\n", level_avg * 100.0, level_dev / level_avg * 100.0, quality_avg * 100.0);
it = bnetz_telegramm2digit(telegramm);
if (it) {
digit = it->digit;
PDEBUG(DBNETZ, (bnetz->sender.loopback) ? DEBUG_NOTICE : DEBUG_INFO, "Received telegramm '%s' (RX Level: %.0f%% Quality=%.0f)\n", it->description, level * 100.0 + 0.5, quality * 100.0 + 0.5);
PDEBUG(DBNETZ, (bnetz->sender.loopback) ? DEBUG_NOTICE : DEBUG_INFO, "Received telegramm '%s'\n", it->description);
} else {
PDEBUG(DBNETZ, DEBUG_DEBUG, "Received unknown telegramm digit '0x%04x' (RX Level: %.0f%% Quality=%.0f) (might be radio noise)\n", telegramm, level * 100.0 + 0.5, quality * 100.0 + 0.5);
PDEBUG(DBNETZ, DEBUG_DEBUG, "Received unknown telegramm digit '0x%04x' (might be radio noise)\n", telegramm);
return;
}