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For example, in a modem, which is a contraction of the terms modulator /demodulator, a demodulator is used to extract a serial digital data stream from a carrier signal which is used to carry it through a telephone line, coaxial cable, or optical fiber. Contents.here are several ways of demodulation depending on how parameters of the base-band signal such as amplitude, frequency or phase are transmitted in the carrier signal. For example, for a signal modulated with a linear modulation like AM (amplitude modulation), we can use a synchronous detector.
To demote someone is to move them into a less important job. Your coffee shop boss might demote you to wiping tables if your attempts to froth milk and pull espresso shots continuously fail. When your employer demotes you, she assigns you an easier task or even an entirely new, lower-ranked position. You may even earn less money. In the military, to demote is to move a soldier down in rank, usually as a punishment. The opposite of demote is promote, which came first. The prefix de-gives the word a sense of down or down from.