[App_rpt-users] RTCM txprelim?

[Tim Sawyer]

Sorry, this deserves a better expansion. Sometimes I get in a hurry.

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.
--
Tim
:wq

On Aug 28, 2013, at 10:26 AM, Tim Sawyer <tim.sawyer at me.com> wrote:

> Absolutely, yes. That is it's normal mode. 
> --
> Tim
> :wq
> 
> On Aug 28, 2013, at 9:42 AM, KJ6KO <kj6ko at innercite.com> wrote:
> 
>> 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..
>> 
>> 
>> __________ Information from ESET NOD32 Antivirus, version of virus signature database 8738 (20130828) __________

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