abnuo 2023-06-14 21:39
Generates DTMF tones using two triangle wave channels, Move the cursor with the d-pad and press or hold A/B to play the tone.
was8bit 2023-06-15 03:45
was8bit 2023-06-15 03:58
Originally, phones where connected to each other by an operator who physically plugged in a wire that connected your phone to another phone... for calls to and from the same village, the local operator had a board with hole for each persons phone, and just plugged one end the wire into your hole, and the other end of the wire into the hole for who you wanted to talk to... this required you to tell the operator who you wanted to call...
To replace the manual connection of wires by human beings (a long distant call required several operaters making many different connections manually) the ROTARY phone was invented... the "clicks" would incrementally select different wire connections, in different locations, until you were physically connect with wire connections, to the person you wanted to talk to...
When electronics improved, the DTMF used duo tones to give the electronics where on the grid you where touching ... it replaced the mechanical rotary connections with electronic controlled connections..
I still own a rotary and touchtone phone... they still work on my landline connection ;)
Of course i also have an iphone... i use all 3 ;)