[EAS] RWT trigger detection...more info

[Harold Price]

Mike,

The Sage ENDEC uses a DSP chip and firmware to encode/decode 
tones.  We're looking into how much effort it would take to add DTMF 
detection into the existing DSP code, and what impact it would have 
on the FSK encode/decode and ATTN/1050hz encode/decode, audio 
record/playback, level monitoring, and other duties of the DSP chip.

We'd also, of course, need to update the main CPU software to set 
what tones you want to trigger on, what audio channel(s) you want to 
trigger from, what header to send, which of the multiple outputs you 
want to play it out on, add software to handle setting the option 
through the front panel, modify ENDECSetD to set it in the settings 
file, write documentation, and test.

And, be prepared to address the inevitable next request, "Can I 
forward a pending alert with a DTMF signal?  Kill a pending alert?".

I'm not saying no.  It isn't just an afternoon's work, either.  I'll 
let you know after we've taken a look in detail.

There are, as you have said, hardware modules that will detect DTMF 
codes and close a relay.  Some are for sale by the usual list of 
broadcast distributors in the $200 range, $99 used.  $5 gets you a 
board you can hook up to a power supply.

Harold

At 08:33 PM 7/7/2012, Mike McCarthy wrote:
>My query wasn't necessarily for validation. It is simply to see whether
>the MFR's ***could*** do it and interest in the community at large. If
>so, the rest is logistics.  If not, I'll just go about it using an
>external decoder.