Asterisk ships audio around (on the links, etc) as line-level audio (not pre-emphasized and needs no de-epmhasis). This works out great for telephones, computer clients, voice announcements, etc because Asterisk doesn't have to do any filtering. After all Asterisk is a telephone PBX where you would expect audio to be line-level (speaker/mic) audio. This leaves the pre/de-emphasis up to app_rpt channel drivers. Chan_usbradio and chan_voter can add pre-emphasis. Chan_simpleusb cannot pre-emphasise.
With chan_voter the DSP pre-emphasis is turned on by setting txctcss = xxx.x in voter.conf. If you want pre-emphasis but no TX P/L set txctcss = to some (any) tone and set txctcsslevel = 0.
Hope that helps.
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Absolutely, yes. That is it's normal mode.
I am looking into an RTCM. Does it have the capability of driving a modulator directly? May have to use it with an old Palomar controller which is set up for direct modulator input style TX audio (pre-emphasized)
txprelim=yes?
I know it has the ability to de-emphasize the DISC audio from the Palomar.
Thanks..
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