[arm-allstar] developing voice packs for ASL/HamVoIP

[Patrick Perdue]

I thought about using SLN (raw PCM.) Asterisk can take files at 48 kHz 
16-bit signed, and translate them to any codec, in the unlikely event 
that you are using G722. Probably way overkill in this case, though.

Speaking of G722, is anyone using that on a public node? I'd like to try 
that between two nodes. Anyway, I could convert to raw PCM as easily as 
raw ULAW with SoX. At 8 kHz, it takes twice the space as ULAW, but with 
very little benefit, as far as radio goes. ULAW is definitely a huge 
improvement over GSM for... well... anything, really, but anything that 
isn't GSM would take more work to implement on a HamVoip system, since 
some scripts called from outside of Asterisk are hard-coded to GSM. It 
would be pretty easy to write a script that recursively searches for 
.gsm in *.pl and *.sh in /usr/local/sbin, I guess.

Oh, and that's another good reason to not use any containers. You can 
splice raw data without worrying about pops and clicks from riff wav 
headers and the like, even if you use a supported file format that 
Asterisk likes within that container.

On 10/23/2019 7:16 PM, "David McGough via ARM-allstar" wrote:
> Hi Danny,
>
> Remember that the .wav format is just a container. Many different CODECs
> can be used in the .wav container, most of them incompatible with
> asterisk. In addition, the files are somewhat larger and realistically not
> easier to manage with sox, for asterisk use. The reason is that you've
> still got to tell sox all the details about the CODEC to use, sample rate
> (8KHz), etc.
>
> 73, David KB4FXC
>
>
>
> On Wed, 23 Oct 2019, "Danny K5CG via ARM-allstar" wrote:
>
>> If we're not concerned about disk space whynot use wav files. They play just fine and are easier to manipulate with tools like sox.
> Danny
> K5CG
>
>
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