Well... one current alternative (and talk about latency...) is to record high
quality speech audio in whatever format you want (hopefully, using an open
source codec) and send it as a file. I have done this over HF using WinDRM.
Now, you can have all the "quality you want"... you just have to wait for it.
It is not very practical but neither is wide BW DV on HF unless you use (if you
could use..) some type of spread specturm.
Mel
----- Original Message -----
From: Bruce Perens
To: [email protected]
Sent: Monday, March 18, 2013 10:11 AM
Subject: Re: [Freetel-codec2] speech bandwidth
Have you tried digital radio mondial? It might be more appropriate for hi-fi.
Albert Cahalan <[email protected]> wrote:
For me, the hope has been that digital voice would allow crammingsuperior (to
humans) audio into the same radio spectrum. I'm reallydisappointed to see the
same old just-under-4-kHz limit being used.SSB incompatibility is kind of
pointless if it isn't an improvement.There are numerous reasons to want wider
speech bandwidth:Cochlear implant users need it. They struggle with
telephones.People listening in a non-native language need it. When thelanguage
is not natural for you, being unable to hear the differencebetween F and S (an
English example) becomes a huge problem.You need to hear every word correctly
because you can't mentallyfill in the blanks.Distorted audio is tiring. It's
just plain unpleasant.Distinguishing speakers would be rather nice. Consider
people whoare closely related,
of similar age, and/or high-pitched females.Polycom has some nice graphs
regarding
intelligibility:http://www.polycom.com/global/documents/whitepapers/effect_of_bandwidth_on_speech_intelligibility_2.pdfPeople
are even widening up analog in the ham bands now.(for example, 6 kHz wide)
Google for any of:hi-fi ssbhifi ssbessbBeing analog, this of course does take
more spectrum.Remember also that one of the reasons for people to use Skypehas
been the audio quality, The old versions sampled at 11.025 kHzonly. Despite
lossy compression, this is better than 8 kHz POTS.With better audio, operating
style can even change. There is noneed for a phonetic alphabet if you can
understand letters just
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