[Scan-DC] Question about analog simulcast voice quality

[Jeff Krauss]

I don't agree. I think that the noise-free digital voice is always at 
least as good as the noisy analog.
What specific element of voice quality do you think is worse on the 
digital feeds?
Do you find the Radio Reference digital feeds to be any different 
than you own scanner?





>Message: 8
>Date: Mon, 24 Jan 2011 20:02:20 -0500
>From: Doug Kitchener <oldsdoug at hotmail.com>
>Subject: Re: [Scan-DC] Question about analog simulcast voice quality
>To: <scan-dc at mailman.qth.net>
>Message-ID: <COL122-W32729275ACF8DA48187DB5C2FC0 at phx.gbl>
>Content-Type: text/plain; charset="iso-8859-1"
>
>
>I can't contribute anything to the knowledge here, but I wonder if 
>you might be onto something, Andy, because the Montgomery system 
>does something similar... I wonder if it's just that the audio 
>circuits in the "professional" two-way radio systems are of a higher 
>quality than those in the consumer scanners.? (Actually, the other 
>way around, that the consumer ones are not as good in order to keep 
>the cost down.)
>
>Thinking about the codec, my guess is this group is pretty well 
>informed, so we'd have probably have heard something through the 
>grapevine... but the idea does make sense....
>
>DK
>
>----------------------------------------
> > Date: Mon, 24 Jan 2011 18:22:59 -0500



> > From: aclegg at nsf.gov
> > To: scan-dc at mailman.qth.net
> > Subject: [Scan-DC] Question about analog simulcast voice quality
> >
> > I have a dumb question. Why is it that the 800 MHz analog simulcast of
> > Arlington's digital P25 system has audio quality that is soooooo much
> > better than when I listen to their digital system on any digital
> > scanner? The analog simulcast has to be from decoded digital audio, but,
> > except for times when the PD/FD units are on the fringe of coverage and
> > become "digital," the audio quality is crystal clear. On the other hand,
> > the digital system as monitored on a digital scanner sounds like warbly
> > muffled audio like the speaker is at the bottom of a pool, with their
> > hands over their mouth to boot.
> >
> > Is there some sort of proprietary (and superior) P25 CODEC that is not
> > available in (or too expensive for) consumer scanners? If so, has anyone
> > seen a discussion of this CODEC online anywhere, and whether the scanner
> > manufacturers will ever be able to get hold of it? To me it seems like
> > the next logical step in scanner product development - vastly improved
> > digital audio!
> >
> > Andy