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How does a telephone work inside?

How does a telephone work?

  • I'm doing a science show and tell and I am going to be talking about how sound travels through a telephone. Any ideas?

  • Answer:

    A standard house phone that's connected to the phone wire at the wall is an analog device. It's current operated and variations in the current at the earpiece recreate the sound that the mic from the other phone picks up. This sound modulates the current flowing in the wire from that phone to the phone companies central office where it's connected to the wire that goes to the other phone. There may be a link in between the two phones where the signal is digital. But the phones themselves are analog and the signal will have to be converted back to analog before it's sent to the phone. The link below give more information and pictures as well.

gymnast1... at Yahoo! Answers Visit the source

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yes. see when you dial to someone's house the phone translates the signal into computer electrical pulses. A certain pulse for each number. and when all this is done it moves at light speed...well 99.97 % light speed. So when you talk into the phone it's QUICKLY translated from sound to the electrical pulses then moves through the cables and is retranslated back intio sound so the person on the other end can know what's going on. This is it in a nutshell

digitalbluray

Phones work off of what is called loop current. The "sending" side of the phone modulates the send audio by varying the current load on the line. Likewise, the "receiver" side feeds the varying current to a speaker or an amplifier (powered by a filtered current), which feeds a speaker. Ringing is done by applying a 9V 20Hz pulsating DC signal on the line. A capacitor on the ringer lets only that signal pass to the ringer circuit. The phone senses "on hook" or "off hook" by opening the loop circuit when the phone is on hook.

classicsat

When I was yong(er) I was told it was like a series of numbers travelling down the phone line to the other phone and then they get decoded and expressed as voice to the recepient. I guess in the end its just a series of electrical impulses that makes the sound. Good luck with your show n tell anyway!

Southern_Northener

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