"Dial sound" with Whelen voice

[JasonC]

I see, so your saying it wouldn't be possible to "dial a siren" to make it go off?

Not unless you have a phone control relay hooked up between a phone line and the siren. Wireless DTMF and phone technology are two totally seperate technologies.

[SirenEnthusiast360]

A phone control relay? Hypothetically speaking, where would I find one of those?

[JasonC]

A phone control relay? Hypothetically speaking, where would I find one of those?

http://www.ramseyelectronics.com/cgi-bi ... &key=DCI1C

[SirenEnthusiast360]

Does that thing give off a dial tone when you use it, like a telephone does?

[JasonC]

Does that thing give off a dial tone when you use it, like a telephone does?

No, it listens for a DTMF though an audio source and activates the appropriate relay when it "hears" the proper DTMF tone.

[loudmouth]

heres some videos to exsplane DTMF code and what its possible to do.

http://www.youtube.com/watch?v=Is-ZG97LLv0


and a way to decode it
http://www.youtube.com/watch?v=RmsoI7GOsPQ

But do not try any of this for siren or any warning device,
sirens arnt for fun they are a tool for saveing lives.

[SirenEnthusiast360]

I listened to that, sounds different than the dtmf I am used to, much different. The tones don't even sound like they're the same type of dtmf on a phone.

[JasonC]

I listened to that, sounds different than the dtmf I am used to, much different. The tiones don't even sound like they're the same type of dtmf on a phone.

Well, the DTMF tone you just heard in the video was transmitted through a 1 watt speaker (probably on half volume), recoded to a video camera (probably analog), then the video was transferred to a computer (again, probably by analog cables), compressed to a mpeg file of some sort, and then uploaded to Youtube where again, it is compressed.

Haha, I'm not being a smart-aleck. In short, its DTMF, its just the video makes it sound different. But yeah, you can do all kinds of stuff with DTMF decoders and phones.

Also on a related note, sirens on a "leased landline" telephone system did not use DTMF tones. Rather, a pair of wires were "leased" to provide a simple 2-wire long distance contact closure between the activation point and the siren.

[SirenEnthusiast360]

that dtmf decoder/encoder thing you were talking about earlier, Can anybody have those or are they restricted to emergency personel only?

[JasonC]

that dtmf decoder/encoder thing you were talking about earlier, Can anybody have those or are they restricted to emergency personel only?

Anyone. A phone is a DTMF encoder as well.