3 ms·
But the electronics would be different if you did it by tapping the line switch, than if you did it by generating a sharp noise on the line. After all, pulse di
by Luc 17y ago
But the electronics would be different if you did it by tapping the line switch, than if you did it by generating a sharp noise on the line. After all, pulse dialing is also called 'loop disconnect dialing':
http://en.wikipedia.org/wiki/Pulse_dialing http://en.wikipedia.org/wiki/Pulse_dialing
"The pulses are generated through the making and breaking of the telephone connection (akin to flicking a light switch on and off); the audible clicks are a side effect of this."
It's confusing.
- anigbrowl 17y agoWell, if you think of it in terms of voltage rather than switching, the audio transient will cause similar spikes in the voltage amplitude. I think that the analog circuits in exchange hardware are only interested in the shape rather than the origin of the pulse but as I said I've never looked at such equipment directly. I have a modular synth here and have managed to rig up a patch that counts audio pulses (incoming signal goes through a rectifier and an envelope follower and on to an accumulator) and generates an appropriate tone for the counted number after a ~1/4 second pause, and doesn't much care whether I'm opening and closing the circuit or just tapping the front of the microphone. It's not a very complex circuit so maybe analog exchange switching works on a similar principle.