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ensure all old references of rms have been updated to pwr, we avoid sqrt calculations and squelch comparisons are using the same units with updated default level

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arancormonk
2025-09-04 14:08:22 -04:00
parent da8b9b6116
commit 8ec385fdf2
10 changed files with 87 additions and 71 deletions
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25
src/rtl_sdr_fm.cpp
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@@ -3744,10 +3744,10 @@ void open_rtlsdr_stream(dsd_opts *opts)
}
dongle.dev_index = opts->rtl_dev_index;
// demod.squelch_level = opts->rtl_squelch_level; //no longer used here, used in framesync vc rms value under select conditions
// demod.squelch_level = opts->rtl_squelch_level; //no longer used here, used in framesync vc pwr value under select conditions
fprintf (stderr, "Setting RTL Bandwidth to %d Hz\n", rtl_bandwidth);
// fprintf (stderr, "Setting RTL Sample Multiplier to %d\n", bandwidth_multiplier);
fprintf (stderr, "Setting RTL RMS Squelch Level to %d\n", opts->rtl_squelch_level);
fprintf (stderr, "Setting RTL Power Squelch Level to %d\n", opts->rtl_squelch_level);
if (opts->rtl_udp_port != 0) port = opts->rtl_udp_port; //set this here, only open socket thread if set
if (opts->rtl_gain_value > 0) {
dongle.gain = opts->rtl_gain_value * 10; //multiple by ten to make it consitent with the way rtl_fm works
@@ -3971,28 +3971,19 @@ void rtl_dev_tune(dsd_opts * opts, long int frequency)
}
/**
* Return mean power approximation for soft squelch decisions.
* Return mean power approximation (RMS^2 proxy) for soft squelch decisions.
* Uses a small fixed sample window for efficiency.
*
* @return Mean power value.
* @return Mean power value (approximate RMS squared).
*/
long int rtl_return_rms(void)
long int rtl_return_pwr(void)
{
long int sr = 0;
// #ifdef __arm__
// sr = 100;
// #else
//debug -- on main machine, lp_len is around 6420, so this probably contributes to very high CPU usage
// fprintf (stderr, "LP_LEN: %d \n", demod.lp_len);
//I've found that just using a sample size of 160 will give us a good approximation without killing the CPU
// Return mean power (squared RMS) for soft squelch decisions (sqrt-free)
// sr = mean_power(demod.lowpassed, demod.lp_len, 1);
long int pwr = 0;
int n = demod.lp_len;
if (n > 160) n = 160;
if (n < 0) n = 0;
sr = mean_power(demod.lowpassed, n, 1);
// #endif
return (sr);
pwr = mean_power(demod.lowpassed, n, 1);
return (pwr);
}
/**