[arm-allstar] HAMVOIP Update 5-28-2018

[David McGough]

Tom,

The new low-pass filter is always enabled and assists in transcoding
between the 8KHz sample rate used by Asterisk/AllStar and the 48KHz sample
rate used by the CM1xy sound card. It is used for both 48KHz ---> 8KHz and
for 8KHz ---> 48KHz.  It replaces the original FIR filter which was lower 
performance.

The new DCS/PL High Pass filter is optionally enabled by setting the
parameter dcsfilter=yes in node stanza in /etc/asterisk/simpleusb.conf.  
This parameter is adjusted with option "Q" from simpleusb-tune-menu and
can be turned on/off in real-time, so you can hear what the filter is
doing. For getting rid of low-end noise, it is impressive!

73, David KB4FXC



On Mon, 28 May 2018, "Tom Whiteside via arm-allstar" wrote:

> Doug,
> 
> Thanks guys for the new update and all you do!   Is this new low pass filter
> a replacement for an existing filter that is already enabled or a new
> feature that we need to enable ourselves.   If it is something for us to
> enable, what is the incantation?
> 
> Tom N5TW
> 
> 
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