Usb OTG with a sound card plugged in?
On 5 Jun 2016 15:53, "Brady O'Brien" <brady.obrien...@gmail.com> wrote:
> If someone did want to write a proper android app, the FreeDV API is
> pretty straightforward and should run just fine under the NDK, though I'm
> not sure how one would work around the dual audio card requirement.
>
> On Sat, Jun 4, 2016 at 5:10 PM, Adrian Musceac <kanto...@gmail.com> wrote:
>
>> Thanks David, but I cheated a little. It's not really Android, more like
>> an
>> unholy mixture of Android and GNU/Linux.
>>
>> The way it works is you pop in an SD card, and an Android app starts a
>> Debian container which runs Gnuradio, FreeDV and possibly also any
>> other Linux amateur radio software. The host Android OS is blissfully
>> unaware of what is happening underneath, and this also means you
>> don't have to go destructive on your phone.
>> The downside is you lose temporarily the ability to make calls, because
>> Linux takes over the whole sound system. This is why I'd like to see
>> some Android developers stepping up.
>>
>> As for the PTT, it's currently not operational, because the audio out line
>> has a weird pin-out, with one pin being used for the button on the
>> headphones, which is not making my Yaesu FT60 happy. I'll probably use
>> that button for the radio PTT and to trigger the application itself. A
>> different radio like the 857 might require a different cable, and I'm
>> terrible at hardware design.
>>
>> Cheers,
>> Adrian
>>
>>
>> On Sunday 05 June 2016 06:34:00 David Rowe wrote:
>> > Wow that's really awesome Adrian! Great job at integrating all of
>> those
>> > modules with Android. How well does the PTT work, e.g. can you use
>> it
>> > for real QSOs?
>> >
>> > Cheers,
>> >
>> > David
>> >
>> > On 04/06/16 18:13, Adrian Musceac wrote:
>> > > Hi all,
>> > > I was thinking the other day, that it would be nice to pair a cheap
>> > > Android smartphone with a standard analog FM handheld radio
>> (maybe a
>> > > Baofeng) and upgrade your aging FM transceiver to a state of the
>> art
>> > > digital radio with Bluetooth, GPS, the ability to bridge voice through
>> a
>> > > VoIP channel using the Wifi or 3G connection and many other
>> features.
>> > >
>> > > So what is stopping us from doing that? Not very much apparently.
>> All
>> > > the bits and pieces are there already, David and Brady did a huge
>> amount
>> > > of work on the VHF 2400 modes, so sending a 1300 bit/s stream of
>> Codec2
>> > > over the air using a standard handheld should be a breeze. But we
>> might
>> > > need to be able to also talk APRS to send coordinates, so
>> switching
>> > > between modes should be easy.
>> > >
>> > > Or, why not connect a bog standard Android phone to a credid
>> card sized
>> > > SDR frontend like the USRP B205-mini and step into the future of
>> pocket
>> > > SDR radio from DC to daylight. Gnuradio already has very good
>> > > optimizations for ARM v7 using the neon_hardfp_orc Volk kernel,
>> and it
>> > > can only get better from here.
>> > >
>> > > So, I hacked together a few scripts to pair a cheap Chinese
>> cellphone
>> > > with my analog FM handheld and send digital voice using gnuradio
>> and
>> > > Codec2. Introducing project DroidDV - digital voice through a
>> standard
>> > > smartphone. Now, if only I could find a couple of enthusiastic
>> Android
>> > > developers to create all the software and wrap it around in a nice
>> > > looking interface to make it marketable.
>> > >
>> > > Here's a video showing what can be done in a few hours:
>> > > https://www.youtube.com/watch?v=JibJhNs13qw
>> > >
>> > > Cheers,
>> > > Adrian
>> > >
>> > >
>> > >
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