Q.

AM system use only product detector for demodulation. They never use envelope detectors.

A. true
B. false
Answer» B. false
Explanation: am systems can use either product detector or envelope detector for demodulation. as a rule, envelope detectors are useful when input signal power is at least 10db greater than noise power, whereas product detectors are able to process the am signals with input signal to noise ratios well below 0 db.
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