[hpsdr] KISS 1.1.24 used with VAC from digital program?

[Hermann]

Dear George,

thanks also for your answer! And you have hit a point where I stumbled upon
as soon as I started thinking about: re-sampling and keeping 'audio' or
whatever stream smooth, that is, in a multi-threaded application you have
to carefully synchronize data streaming. There is already a very nice
example in cuteSDR by Moe Wheatley, AE4JY.

I have not looked into PowerSDR's VAC implementation, but even just sending
the audio to the local soundcard is tricky, since, as you know, to every
504 samples of audio data we add 8 Bytes of command and control information
to the stream. But maybe its much more simple than I think of it now. Need
to start coding!

Thanks again,
73, Hermann
DL3HVH



On Sun, Dec 16, 2012 at 3:59 PM, George Byrkit <ghbyrkit at chartermi.net>wrote:

> Dear Hermann,
> You've gotten some very substantial and informative answers to the 'what
> is VAC' question,
> far beyond what I could have done!
>
> I would add that in some previous discussions on this list, the issue of
> the data rate of
> the audio data was also brought up.  PowerSDR only supports the 48k sample
> rate, I think.
> That means that it doesn't do the more common 44.1k sample rate and
> similar.  So a lot of
> other programs that you might 'plug in' to PowerSDR don't work or don't
> work properly
> because of this mismatch in the data rate.  There was discussion at that
> time about things
> like data-rate-converters, which might be used.  It would seem that these
> would have to be
> built into PowerSDR (or cuSDR or other software) to adapt PowerSDR's
> internal design to
> the rest of the outside world.
>
> I'm likely discussing this issue poorly, due mostly to only being
> peripherally aware of
> it, and not knowing enough about actually programming audio data streams
> to speak with
> real knowledge on it.  Others know a lot more, from what I recall, and
> hopefully, they can
> point out the previous discussion or recall the essence of it.
>
> 73,
> George K9TRV
>
>
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