Distortion and Modems
Modem Laminations/Applications
Schematic Representation
Distortion can be better understood by considering the following
modeling technique. The nonlinearity inherent in a magnetic
device introduces the distortion (see Fig 4).
Note
how the signal is distorted by the magnetic device. Therefore,
it is desirable to use a magnetic material in the linear portion
of the curve. In other words, it is best to design the transformer
to operate at a low flux density (B<0.03 Tesla).
Modem Functions
There are two basic functions of a modem.
- Modulation
The purpose of modulation is to convert binary data from the computer into
analog signals that can be transmitted over standard telephone lines.
- Demodulation
The purpose of demodulation is to convert the analog signal received by a
modem over the telephone line into binary data suitable for a computer.
Definition of a Modem
A modem is a device that allows two computers to communicate
with each other through a standard telephone line. A standard
telephone line is not designed to transmit the digital signals
required by computers. Therefore, the digital signals from
the computer must be converted into a signal that can be transmitted
through the telephone system.
Modem
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