A ringtone or ring tone is the sound made by a telephone to indicate an
incoming call. The term, however, is most often used to refer to the
customizable sounds available on mobile phones. This facility was
originally provided so that people would be able to determine when their
phone was ringing when in the company of other mobile phone owners.
A phone only rings when a special "ringing signal" is sent to it. For
regular telephones, the ringing signal is a 90-volt, 20-hertz, AC wave
generated by the switch to which the telephone is connected. For mobile
phones, the ringing signal is a specific radio-frequency signal.
A telephone ring is the sound generated when an incoming telephone call
is received. The term originated from the fact that telephones notified
the user to an incoming call by repeatedly striking a bell or bells,
producing a ringing sound.
This "Magneto" bell system is still in widespread use; newer telephones
use electronic sounders to produce other noises, but the term "ring" is
still used. The ringing signal sent to a customer's telephone is AC at
around 90 volts (at 20 hertz in North America, because of the use of 60
Hz mains; other regions with 50 Hz mains use 25 Hz); modern telephones
electronically produce a warbling or chirping sound. The signal is sent
for every ring and allows phone operators to provide several services
with different kinds of rings (for example, rings with a shorter
interval between them might be used to signal a call from a given
number). When a home phone rings, it may carry Caller ID information and
present it on a screen.
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