[Asterisk-Dev] notch / high pass filter addition to zaptel
stevek at stevek.com
Tue Jun 28 15:13:25 MST 2005
Kelly McDonald wrote:
>I've got a cheapo x100p substitute, (sorry for being cheap),
>everything is working fine with it, had some echo but aggressive echo
>correction fixed this.
>The only issue I have left is a ~60hz hum that seems to be coming from
>the card itself (bad ps bypassing is my guess)
>I was wondering about adding a high pass filter or notch filter
>somewhere in zaptel, I see that there is already a notch filter set up
>and being used in ztcfg-dude.c
>I'm just wondering if there are any pointers anyone would have for me in
>my attempt to do this, or perhaps this has already been done, and I
>should just 'flip a switch' somewhere.
>Thanks for any suggestions.
I'd try adding an electrical filter to the line before it goes into the
card, first. It may be that the hum is on your line..
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