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Analog Electronics
refers to the field of electronics that deals with analog or 'real-world'
signals. An analog signal is a signal that is both variable and
continuous, and
therefore allowed to assume any value between its applicable lower and
upper limits. This is in contrast with a digital signal, which can
only assume discrete or quantized values. Analog signals represent
waveforms that are commonly encountered by humans in the real world.
In telephony, for example,
one's voice is translated into an analog electrical signal that can be
transmitted continuously over wires, received on the other end, and made
to vibrate a speaker that translates the analog electrical signal back
into sound waves again.
Although our society is
becoming more and more digital everyday, the output of a digital system
almost always needs to be converted back into analog form in one way or
another for our day-to-day use in the physical world.
Analog signals may be
converted into digital signals and vice versa by devices known as
analog-to-digital converters (ADC's) and
digital-to-analog converters
(DAC's), respectively.
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