[arm-allstar] NEW: simpleusb driver updates

[Doug Crompton]

As mentioned duplex=2 is default and should be used. It reduces audio
latency as I describe in a previous email. This effects all FOB sound
devices.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*



On Sun, Oct 29, 2017 at 7:01 PM, "C B via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Hi
> will this have any change and or improvement when using duplex = 2?
> is the CM1XY used in the URI?
> Thank you for all of your hard work.
> Chris
>
>       From: David McGough via arm-allstar <arm-allstar at hamvoip.org>
>  To: arm-allstar at hamvoip.org
> Cc: David McGough <kb4fxc at inttek.net>
>  Sent: Sunday, October 29, 2017 8:43 AM
>  Subject: [arm-allstar] NEW: simpleusb driver updates
>
>
>
> Everyone,
>
> Working to further improve/reduce audio latency, I've improved how the
> simpleusb driver sends audio to the CM1XY USB sound device.
>
> Now, the simpleusb.conf parameter "duplex=[0|1]" is implemented.
> Previously, this parameter had no effect, it has always only been a
> placeholder. Now, the default configuration is "duplex=1"  for all nodes.
> If you wish to continue to use the original code for any reason, set
> "duplex=0".
>
> With "duplex=1" (the new default) enabled, the simpleusb driver continues
> to send frames of silence to the audio adapter at all times; even when the
> transmitter (PTT) isn't active. This reduces the impact of the variable
> start-up latency issues which simpleusb has classically exhibited.
>
> Note that by sending audio frames continuously, the activity LED
> pattern you'll see on the CM1XY device has changed, too.
>
> This software update is in this morning's release. Please use pacman to
> update your systems when convenient---admin menu option #1.
>
> Also, you can check the dynamically updated release notes (which are
> included on the RPi2/3 in the file: /etc/allstar_version) at this URL:
>
> https://hamvoip.org/local/allstar_version.php
>
>
> Thanks,
>
>
> 73, David KB4FXC
>
>
>
>
>
>
>
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