OK, from what I understand, dial tones replaces manual telephone office operators. Instead of having them connect you to your number, the numbers you press correspond to particular frequency which get recognized automatically by a computer and automatically connects you to that number
Except, how do the tones even get recognized? I use audacity for instance which has a pitch recognition feature. It’s… Not the best and can and will get things wrong on crystal clear audio
Phone audio on the other hand? The connection would be weak, someone playing or shouting something in the background could mess with the dial tone data sent to the office (of which I am aware phreaking exploited)
It’s the late 70’s. How did the telephone office computers recognize the tones perfectly and without error? All it takes is someone shouting or playing something in the background or a telephone microphone with terrible frequency response, or electromagnetic interference to mess with the dial tone data sent to the office and confuse it
This could cause everything from numbers never going through, to connecting one to the wrong number, yet this never happened, on 70’s tech no less
What did they do for crystal clear tone recognition in the 70s that my audio software on my 2019 laptop can’t?
In: Technology
yo that’s a good question man. they used something called dual-tone multi-frequency signaling. two tones at once made it easier to tell the number. kinda genius right? plus their tech was built for that kinda clarity. makes our stuff look lame. guess they had no background noise drama back then too
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