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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.
1 A circuit breaker is a switch. 2  It performs the same function as a fuse, although a circuit breaker can be reset. 3  When the circuit breaker is thrown, the circuit is disconnected from the power source. 4  An isolator is a component that allows AC signals to pass, but stops DC signals.