A telephone system is a communication device that transmits any voice/sound signal to a distant location by converting these sound signals into waveforms and receiving and reconverting the same waves into sound signals/voices. The telephone network is generally expanding, so if you want to talk to someone, just pick up the phone system and dial a few digits. You can contact the person immediately and both parties can have a two-way conversation.
The telephone system was first introduced by Graham Bell more than a hundred years ago, but it still uses the same working principle. To make a call, we need to pick up the handset first. This causes the telephone system to connect to the routing network. The signal is transmitted to the routing station over the telephone line by pressing a number on the push-button keypad/frequency generator. Here, each number is identified as the only combination of pitch frequencies. The specific combination of numbers allows the signal to be passed to other telephone systems to ring. When picking up the phone, the connection between the two phone systems is achieved.
The headset acts as a speaker and the mouthpiece acts as a microphone. Sound waves from the user's voice cause vibration of the thin plastic disk present within the telephone system. This causes a change in the distance between the plastic disk and the other metal disk, resulting in a change in current through the telephone line. The receiver on the other handset receives this solenoid current. These magnets vibrate the diaphragm and produce a sound/sound that induces current. The amplifier at the receiver makes it easier to hear. When one of the phones hangs up, the current is disconnected, causing the phone system to disconnect.
Orignal From: Telephone System - Overview of How It Works
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