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NMT: Fix and adjustements to supervisory signal detection

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This commit is contained in:
Andreas Eversberg
2017-06-10 17:11:47 +02:00
parent 50b2021d21
commit 19afb792b5
2 changed files with 10 additions and 7 deletions
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7
src/nmt/dsp.c
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@@ -65,7 +65,8 @@
#define DIALTONE_HZ 425.0 /* dial tone frequency */
#define TX_PEAK_DIALTONE 0.5 /* dial tone peak FIXME */
#define SUPER_DURATION 0.25 /* duration of supervisory signal measurement */
#define SUPER_DETECT_COUNT 4 /* number of measures to detect supervisory signal */
#define SUPER_LOST_COUNT 4 /* number of measures to loose supervisory signal */
#define SUPER_DETECT_COUNT 6 /* number of measures to detect supervisory signal */
#define MUTE_DURATION 0.280 /* a tiny bit more than two frames */
/* two signaling tones */
@@ -385,7 +386,7 @@ static void super_decode(nmt_t *nmt, sample_t *samples, int length)
if (nmt->state == STATE_ACTIVE)
PDEBUG_CHAN(DDSP, DEBUG_NOTICE, "Supervisory level %.0f%% quality %.0f%%\n", result[0] / 0.63662 / TX_PEAK_SUPER * 100.0, quality * 100.0);
if (quality > 0.5) {
if (quality > 0.7) {
if (nmt->super_detected == 0) {
nmt->super_detect_count++;
if (nmt->super_detect_count == SUPER_DETECT_COUNT) {
@@ -399,7 +400,7 @@ static void super_decode(nmt_t *nmt, sample_t *samples, int length)
} else {
if (nmt->super_detected == 1) {
nmt->super_detect_count++;
if (nmt->super_detect_count == SUPER_DETECT_COUNT) {
if (nmt->super_detect_count == SUPER_LOST_COUNT) {
nmt->super_detected = 0;
nmt->super_detect_count = 0;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Supervisory signal lost.\n");