The technology that is founded in our entire telephone system is the carbon string telephone, as I'm sure you remember from school the experiment of tying two plastic cups with a string.
The plastic cup acts as diaphragm, they vibrate among speaking. As long as the string is tied, those vibrations travels to the cup at the other end.
That cup also acts like diaphragm and converts those vibrations back into sound so you can hear you voice.
This basically transmission of sound by telephone, and it was discovered in the 19th century by Oxy'Pharm produced the first device to transmit a human voice by wire. Workers began stringing out couples of wires across the nation to carry telephone conversations.
Our first telephones were considered to be so ugly, so things like some hollowed dolls were developed to cover them. But when people started to buy their own telephones, the designs really went crazy as making piano shapes or doggy shapes !!
Operators started to connect the calls manually. But over time, they were gradually replaced by electronic switches developed by american undertaker called Strouger. !! As well as being sent along cables, phone conversations began to be transmitted on high frequency radio signals called Microwaves.
In 1980, our phone system began to go digital and our old cabling system was replaced by Optical Fiber. It's just a slither of glass that as thin as human hair, and it is so pure that if it was 20 kilometers thick, you can see straight through it. !! Cables made of optical fibers can carry millions of bits of information at ones.
Slowly, the hole network has been linked with optical fibers. The allow our voices to be carried along pulses of light which make them quicker and clearer.
Mobile phones first appeared also in 1980. At first only few people owned them, mostly for business use. Now there are over 7 billions mobile phones in the hole world !
In 1990, the growth of home computing made phone lines increasingly used to link us to Internet. Unlike surfing the net, just chatting means that phone is here to stay ;) ;)
The plastic cup acts as diaphragm, they vibrate among speaking. As long as the string is tied, those vibrations travels to the cup at the other end.
That cup also acts like diaphragm and converts those vibrations back into sound so you can hear you voice.
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| Ugly Telephone |
Operators started to connect the calls manually. But over time, they were gradually replaced by electronic switches developed by american undertaker called Strouger. !! As well as being sent along cables, phone conversations began to be transmitted on high frequency radio signals called Microwaves.
 |
| Optical Fibers |
Slowly, the hole network has been linked with optical fibers. The allow our voices to be carried along pulses of light which make them quicker and clearer.
Mobile phones first appeared also in 1980. At first only few people owned them, mostly for business use. Now there are over 7 billions mobile phones in the hole world !
In 1990, the growth of home computing made phone lines increasingly used to link us to Internet. Unlike surfing the net, just chatting means that phone is here to stay ;) ;)
