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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.
What do demographers do? What do demographers do? Demographers study populations to determine their size and composition and to predict how they are likely to change in years to come. In all countries, this knowledge is key to meeting the populationâs present and future needs, for example, to decide how many new kindergartens, schools or retirement homes are needed.