Question
Write the principle of MODEM in brief.
✓
Answer
MODEM : The word MODEM is a contraction of the terms modulator and demodulator i.e., Modem = Mod + dem which in brief is written as MODEM. Here the three letters MOD are taken from Modulator and the three letters DEM are taken from Demodulator. Thus MODEM is a single device in which both functions of modulation and demodulation can be carried out. In transmission action Modem is used as a modulator and in receiving action it is used as a demodulator. Thus, in a communication system one Modem set is attached with transmitter and another modem is attached with receiver.
A modem is also called data set because it connects the data source (i. e. computer etc.) with the transmitter or the receiver.
A modem is also called data set because it connects the data source (i. e. computer etc.) with the transmitter or the receiver.
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But while the value of λ is physically significant, the value of ν (and therefore, the value of the phase speed ν λ) has no physical significance. Why?