diff options
| -rw-r--r-- | util/spkmodem_decode/spkmodem-decode.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/util/spkmodem_decode/spkmodem-decode.c b/util/spkmodem_decode/spkmodem-decode.c index af60f997..a1a197bc 100644 --- a/util/spkmodem_decode/spkmodem-decode.c +++ b/util/spkmodem_decode/spkmodem-decode.c @@ -571,6 +571,14 @@ detect_tone(struct decoder_state *st) if (st->learn_frames != LEARN_FRAMES) return; + /* + * If the observed frequencies are too close, + * learning likely failed (only one tone seen). + * Keep the default threshold. + */ + if (st->freq_max - st->freq_min < 2) + return; + st->freq_threshold = (st->freq_min + st->freq_max) / 2; |