[hpsdr] Balanced audio on future boards

[Jim Barber]

Ended up sending this only to Bert by mistake:

Hi Bert,

I'd like to suggest that instead of PowerSDR connecting to the sound card
directly that a network streaming audio interface be added
(if it doesn't already exist) that would allow developers to build apps on
any platform to send/receive basic audio and PTT data using
an open-source audio compression codec.

The "remote" app could run on the *same Windows computer as PowerSDR* using
an ASIO audio device, kernel streaming,
bluetooth headset etc. or it could be an Android tablet running remotely
over wireless, a Linux desktop, a phone ... and so on.

Once the streaming interface was implemented, the PowerSDR developers could
continue to work on PowerSDR, and other developers
could write nice audio interface apps for it. For example, I might be
interested in writing a Windows and/or Linux app that would add multi-band
compression, parametric EQ and other features to the audio chain. I don't
have the time or desire right now to be responsible for an entire
branch of PowerSDR, but I could be responsible for my own audio app, as
could other developers.

Parts of it could be done right now using VAC to interface to PowerSDR, but
that seems clumsy to me. It also wouldn't allow for PTT
without a virtual serial port, which again complicates things. Perhaps
virtualizing the CAT command set using a separate socket or
UDP port along side the audio streaming might work.

Just thinking out loud...
Jim N7CXI

On Tue, Dec 1, 2015 at 10:49 AM, H.A.Meijer <meijer.ha at home.nl> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Just to correct my info on the maya44,
> It has symmetrical (mic) inputs, the outputs are (stereo) asymmetrical.
>
>
> Op 1-12-2015 om 19:44 schreef H.A.Meijer:
>
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
>
> Hi Matt,
>
> One can also think about completely deleting the Hardware audio in- and
> output and doing it at the pc/soft- and hardware.
> For now you can do it using VAC and a sound-card.
>
> Look for example at an ESI maya44
> <http://www.esi-audio.com/products/maya44/>, it has symmetric in and
> outputs, even an microphone input with phantom +48V,
> and very low latency (ASIO) and not to expensive .
> I have tested it on my sdr-pc and it works very good (it even solved my
> audio distortions during zooming and panning the panadaptor, h.i.)
>
> Maybe in the future, (not knowing if possible?) HP-Powersdr can skip the
> need for VAC and approach the sound-card directly(?).
>
> 73'
>  Bert PA2XHF
>
>
>
> Op 1-12-2015 om 17:52 schreef Matthew J Wolf:
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Has there been any thought of including balanced audio input and output on
> the future HPSDR boards?
>
> One would think it would be as easy as using a different codec.  A codec
> that provides both single ended and balanced audio.
>
> Having unpopulated headers on the board for the balanced audio would be
> fine. I admit that there would be a minority that would want balanced
> audio.
>
> I have looked at the schematics and the PCBs for Mercury, Pennylane, and
> Hermes. There is no "easy" way to add balanced audio.
>
> -Matt, N4MTT
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