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Definition of "synchronous detection" |
demodulation scheme using a balanced modulator to translate the center frequency of an IF signal down to DC (i.e., zero Hz). A local oscillator (LO) tuned to the IF center frequency is injected into one of the input ports of the balanced detector, while the AM or SSB signal containing the information is applied to the other. When used in this manner, the LO is often referred to as a beat frequency oscillator (BFO). Low-pass filtering the output results in retrieval of the intelligence signal, superimposed upon a DC voltage (or current, dependent upon the actual device). The DC value may either be discarded via high-pass filtering, or used as a received signal strength indicator for use in automatic gain control circuits. |
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