[App_rpt-users] ARM Arch Linux version of allstar

[Anthony Percy]

Hi all,
An update to the Raspberry PI running Allstar email below... Audio is not
corrupted with the iMIC....!!!!

I received my Griffin iMIC today so I fired up my PI with the Arch Allstar
image ( built using the link below)  and plugged it in.
The chan_alsaradio conf file had been configured from before to us hw
devices (not plughw so as to avoid the downsampling etc) and I started up
asterisk ( e.g asterisk -vvvc). When we had the CM108 plugged before, the
chan_alsaraio would crash when you tried a *99 test tone. However with the
iMIC it was stable with a smooth tone emitted when *99 was done!!!
Looks like the downsampling to 8KHz/overhead of the CM108 was the problem.
The chan_alsaradio driver can use a serial port for the PTT/COR so maybe a
usb serial port would work...??
( I will try this as I have one of these, not sure if its supported by the
PI/Arch Linux though)
Or we could code and use the PI GPIO ports....

Just thought I would let you all know...

Regards
Anthony, VK2ACP



On Sun, Jan 20, 2013 at 1:45 PM, Anthony Percy <anthcp at gmail.com> wrote:

> Hi Shane,
> I have also uploaded the ARM Raspberry PI version of the allstar code as
> well which did include chan_voter...at
> https://github.com/anthcp/Arch-ARM-RAS-PI-Allstar
> I hope it helps.
> The compile process is the same as my previous email.
>
> Just to to let you know, I found the sound on chan_usbradio with a CM108
> usb fob was distorted for about 20% of the time when I did the *99 test
> tone on the PI.
> It could be acceptable on voice but I didn't test it any further.
>
>  I then tried to use chan_alsaradio but I think the CPU overhead was too
> high due to the downsampling from 44.1hz (?) to 8Khz.
> I have ordered a Griffin iMIC2 usb sound card which has hardware 8Khz
> sampling built in to see if it will work OK on the PI.( still waiting for
> it)
> If it does then it will mean that we will have to use the PI GPIO's for
> PTT and COR etc but that shouldn't be to hard.....(hopefully :-) )
>
> Regards
>
> Anthony, VK2ACP
>
>
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