[arm-allstar] CODEC2 --was: Radio-less node

[larry]

David,

Could you enlighten us on just what advantage/purpose the Codec2 might 
provide Allstar.
 From what I have read Codec2 deals more with Digital speech along with 
its lower bandwidth transmission.

On an earlier post of Alan's it had a link to listen to what Codec2 
would sound like.
Sorry to say I listened to that example numerous times and never was 
able to determine what the audio example was saying.

Admittedly I have bad hearing but even with a head set I still couldn't 
understand it. Of course I have trouble with Fast talkers as well 
slurred words too.
However no one commented on their take of Codec2 quality. I refrained 
from commenting also since I am not the person to judge audio.

Larry - N7FM



On 7/23/20 1:13 AM, "David McGough via ARM-allstar" wrote:
>
> Hi Alan,
>
> Codec2/3200 is already implemented in the HamVoIP software as a natively
> supported asterisk CODEC. My original thoughts being transporting Codec2
> frames natively between HamVoIP/AllStar endpoints without requiring
> transcoding (and the nasty artifacts) at intermediate hops.
>
> I hacked this code together many years ago (predating the HamVoIP project,
> on an ACID system), expecting that Codec2 would eventually be utilized in
> the ham world, as a alternative to AMBE/IMBE. There really hasn't been
> much (actually ANY) interest, before your messages....But, the code is
> still in place and should work. Testing Codec2/3200 on HamVoIP is easy, I
> can send you more details in a private message, if interested?
>
> I originally planned to allow customization for bitrate and other
> configurable parameters via /etc/asterisk/codecs.conf config file.
> However, at this point, the parameters are all still hard coded.
>
> I also had a hacked copy of chan_usrp which allowed a client to
> send/receive Codec2 frames---this was a trivial hack, just changing the
> AST_FORMAT_SLINEAR parameter to AST_FORMAT_CODEC2, which was/is a custom
> format I defined for Codec2/3200. A somewhat more versatile hack would
> ultimately be needed.
>
> Do you have a working and viable Codec2 radio/repeater solution?? If so,
> my interest might get revived.
>
>
> 73, David KB4FXC
>
>
> On Thu, 23 Jul 2020, "Al Beard via ARM-allstar" wrote:
>
>> Hi guys,
>>
>> On a similar note, can I send the audio to the linux loopback device
>> and, on the other loopback side, feed this audio into a Codec2
>> process and transmit out on mode 700D? And, the other way round,
>> Rx of 700D feeds back it's audio into the node, when the node is not
>> busy?
>>
>> BTW: My Pi 4B is awaiting.
>>
>> Alan VK2ZIW
>>
>>
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