The tone detector has now been further improved. Instead of using the
tone power to passband power relation, the passband power is recalculated
to a noise floor estimation. This estimation can then be used to calculate an
SNR value for the tone detector. Doing this have at least two benefits.
One is that the CTCSS detector now work all over the CTCSS band with good
performance. There is still a problem though if the frequency response is
not flat over the whole band. However, this can now be easily compensated
for by changing the thresholds in the configuration.
That bring us to the second benefit. The threshold is now expressed in dB
which make it an understandable parameter which users can change in the
configuration, much like they turn the squelch knob on their radio.
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