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Voice inversion on Astro
Posted: Wed Jul 09, 2003 8:31 am
by CAPTLPOL
No one has ever answered the question on wheter voice inversion would work well or at all with APCO-25 digital. Well how would it work? Has anyone put a voice inversion board on their ASTRO digital radio?
Posted: Wed Jul 09, 2003 8:53 am
by The Pager Geek
Ummmm.... why?
Is the purpose to encrypt? Just buy a module.....
My feeling is, the voice inversion module would have to be before any astro vocoding. As long as it's not a rolling code, because it looks for, and sends a data chirp to let the other end know to change codes. I would imagine the chirp would get distorted or possibly eliminated.
With that being said, however the voice inversion "usually" sounds plus "astro sound" = what it would sound like.
tpg
Posted: Wed Jul 09, 2003 9:52 am
by CAPTLPOL
Would it pass through an Astro Quantar?
Posted: Wed Jul 09, 2003 2:17 pm
by Renamon
silly perhaps, but it would be cool to hear the inverted audio after being de-IMBE'd but before being de-inverted. lol
Posted: Wed Jul 09, 2003 8:08 pm
by CAPTLPOL
Well it might make some Uniden scanner idiots think that it is encrypted and therefore they would not bother to monitor the transmission.
Posted: Wed Jul 09, 2003 8:28 pm
by The Pager Geek
By tossing in ACTUAL encryption hardware in it (DES, DVP, AES), will also make Uniden Scanners unable to hear it. Plus you don't have to tear apart a perfectly good astro radio....
Either voice inversion or UCM would be encrypt it....
tpg
Posted: Thu Jul 10, 2003 10:35 am
by CAPTLPOL
Well I take it that no one has tried it on here. Just wondering how the inversion would pass with digital, i.e. sound quality. Sounds like I will have to pioneer this myself.