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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 20:06:23 +00:00
parent 8ccaff0d8e
commit 2a32e498c8
1 changed files with 8 additions and 1 deletions
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util/spkmodem_recv/spkmodem-recv.c
+8 -1
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@@ -186,15 +186,22 @@ decode_pulse(struct decoder_state *st)
ringpos = st->ringpos; ringpos = st->ringpos;
sep_pos = st->sep_pos; sep_pos = st->sep_pos;
/*
* Moving sum of the last N
* pulses; O(1) per sample.
*/
old_ring = st->pulse[ringpos]; old_ring = st->pulse[ringpos];
old_sep = st->pulse[sep_pos]; old_sep = st->pulse[sep_pos];
st->freq_data -= old_ring; st->freq_data -= old_ring;
st->freq_data += old_sep; st->freq_data += old_sep;
st->freq_separator -= old_sep; st->freq_separator -= old_sep;
sample = read_sample(st); sample = read_sample(st);
/*
* Noise suppression, with a frequency
* tolerancy defined by THRESHOLD.
*/
if ((unsigned)(sample + THRESHOLD) if ((unsigned)(sample + THRESHOLD)
> (unsigned)(2 * THRESHOLD)) > (unsigned)(2 * THRESHOLD))
new_pulse = 1; new_pulse = 1;