autorange mode for plotter #1423
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autorange mode for plotter Automatic estimation of noisefloor in spectrum, min for waterfall and panadapter is adjusted automatically, max uses the old delta (max-min). - double click y-axis to enable/disable - y-axis turns green - autorange mode is rememberd in settings Noise Floor detection a la Simon Brown, quote: "A few weeks previously a reasonable logic was implemented for measuring the noise floor. Purists will not be happy - they rarely are, but it works for me. Take the output from the SDR radio, ignore 15% of the bandwidth at the high and low end of the output to avoid the ant-alias filtering, and we're left with a healthy 70% of the signal. Now sort the FFT bins by value, take the mean of the lowest 10% and that's the noise floor." Percent values are slightly different, a moving average is added over lowest bins and over time.
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Automatic estimation of noisefloor in spectrum, min for waterfall and panadapter is adjusted automatically, max uses the old delta (max-min).
Noise Floor detection a la Simon Brown, quote:
"A few weeks previously a reasonable logic was implemented for measuring the noise floor. Purists will not be happy - they rarely are, but it works for me. Take the output from the SDR radio, ignore 15% of the bandwidth at the high and low end of the output to avoid the ant-alias filtering, and we're left with a healthy 70% of the signal.
Now sort the FFT bins by value, take the mean of the lowest 10% and that's the noise floor."
Percent values are slightly different, a moving average is added over lowest bins and over time.