Mooneer, talking about do-all "universal" voice mode-
something I'd like would be a hierarchical modem and codec combo
A codec+modem combo that could provide great sounding speed when the
signal was up a few dB, and bare minimum gradually below that.
I did some work with hierarchical modem modes many years ago. originally
QPSK constellations on the points of a BPSK symbol to add two extra
bits per symbol. Later work was using LDC codes to decode at negative
SNR UNDER another positive SNR mode. (after subtraction its not so bad).
On the codec side I was using the highest bit rate codec2 and throwing
away bits and temporal resolution of the pitching from my very basic
work seemed to be the best way forward on this (I did some work on this
on codec2 years ago) .
700 modem didnt exist at that time.
anyway, my 2c -glen
On 24/11/2023 9:57 am, Mooneer Salem wrote:
Hi Kurt,
Adding onto what Mel mentioned, FreeDV has been around since the early
2010s but during that time, more and more FreeDV modes have been added
as well as the SM1000 and the ezDV device (both of which were at the
FreeDV booth at Pacificon). That may be part of the reason for the
confusion.
Longer term, we hope to eventually replace the multiple FreeDV modes
that exist today with a single "universal" mode, which will help
reduce confusion and improve ease of use (no need to figure out the
best mode to TX in). If you have codec or DSP experience, you can take
a look at the GitHub issues at
https://github.com/drowe67/codec2/issues to see if you're interested
in working on some of the stuff required to make this happen.
Thanks,
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