Voice inversion on Astro

Post by **CAPTLPOL** » Wed Jul 09, 2003 8:31 am

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?

The Pager Geek · Post by **The Pager Geek** » Wed Jul 09, 2003 8:53 am

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

Post by **CAPTLPOL** » Wed Jul 09, 2003 9:52 am

Would it pass through an Astro Quantar?

Renamon · Post by **Renamon** » Wed Jul 09, 2003 2:17 pm

silly perhaps, but it would be cool to hear the inverted audio after being de-IMBE'd but before being de-inverted. lol

Post by **CAPTLPOL** » Wed Jul 09, 2003 8:08 pm

Well it might make some Uniden scanner idiots think that it is encrypted and therefore they would not bother to monitor the transmission.

The Pager Geek · Post by **The Pager Geek** » Wed Jul 09, 2003 8:28 pm

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

Post by **CAPTLPOL** » Thu Jul 10, 2003 10:35 am

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.