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RTL - RMS based soft squelch and tweaks; #125

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lwvmobile
2023-05-19 11:27:13 -04:00
parent bf4a4b574c
commit 0842613b24
7 changed files with 52 additions and 16 deletions
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16
src/rtl_sdr_fm.cpp
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@@ -628,9 +628,9 @@ int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency)
int r;
r = rtlsdr_set_center_freq(dev, frequency);
if (r < 0) {
fprintf (stderr, "WARNING: Failed to set center freq.\n");
fprintf (stderr, " WARNING: Failed to set center freq.\n");
} else {
fprintf (stderr, "Tuned to %u Hz.\n", frequency);
fprintf (stderr, " Tuned to %u Hz.\n", frequency);
}
return r;
}
@@ -984,7 +984,7 @@ void open_rtlsdr_stream(dsd_opts *opts)
}
dongle.dev_index = opts->rtl_dev_index;
demod.squelch_level = opts->rtl_squelch_level;
// demod.squelch_level = opts->rtl_squelch_level; //no longer used here, used in framesync vc rms value under select conditions
fprintf (stderr, "Setting RTL VFO Bandwidth to %d Hz\n", rtl_bandwidth);
fprintf (stderr, "Setting RTL Sample Multiplier to %d\n", bandwidth_multiplier);
fprintf (stderr, "Setting RTL Squelch Level to %d\n", demod.squelch_level);
@@ -1087,10 +1087,20 @@ void get_rtlsdr_sample(int16_t *sample, dsd_opts * opts, dsd_state * state)
pthread_rwlock_unlock(&output.rw);
}
//function may lag since it isn't running as its own thread
void rtl_dev_tune(dsd_opts * opts, long int frequency)
{
int r;
dongle.freq = opts->rtlsdr_center_freq = frequency;
optimal_settings(dongle.freq, demod.rate_in);
r = verbose_set_frequency(dongle.dev, dongle.freq);
dongle.mute = BUFFER_DUMP; //test this here -- seems to help with sample lag sending stale samples
}
//return RMS value (root means square) power level -- used as soft squelch inside of framesync
int rtl_return_rms()
{
int sr = 0;
sr = rms(demod.lowpassed, demod.lp_len, 1);
return (sr);
}