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When the level is higher than the threshold sounds are enabled. Level
squelcher adopts stagnating-recursive comparison, whose intetval is 2dB by
default. The threshold would be displayed with a horizontal green line in the
spectrum.
Conversational squelcher: Analyze the audio and judge whether the non-
noise component is larger, if so, sound would be turned on. Otherwise, sound
would be muted. Since it's challenging to distinguish precisely, this squelcher
is a negetive squelcher designed to detect noise, and should be used with
level squelcher. In situation where the signal level is 10dB or even more,
higher than level squelcher's threshold setting, the sound would be enabled
without taking the conversational squelcher into account.
The criteria of CTS and DTS are both certain demodulated signal or data
within the "sub-vocal" range, whose frequncy is lower than the response
frequency of the speaker. The measured signal must be sufficiently fulfilling
the rules to make these functions work.
The spaker icon on the upper part of the screen blinks whenever there is
sound output.
The denoiser adopts a mathematic approach to deal with the white noise and
make the sound clear. To prevent distortion, the denoiser works in a gentle
manner. Denoiser should be disabled if the audio needs an external test.
Level tone, squelchers and audio-related settings can be accessed by
pressing AF and enter the menu.
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