[EAS] RWT trigger detection...more info

[Alex Hartman]

Stupid question, but how far is the "remote EAS"? Could you do it with
a low-speed data subcarrier system? I realize that'd be marginally
expensive, or you could simply do audio on a subcarrier, keeping it
off the main audio channel.

Or if you're running HD, just put it there... nobody's listening anyways. :)

--
Alex Hartman

On Sun, Jul 8, 2012 at 2:20 PM, Harold Price
<hprice at sagealertingsystems.com> wrote:
> 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.
>
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