Another Example
There are many other kinds of product detectors as well. If one has access to digital signal processing equipment, one may experiment with a wide range of interesting techniques. For instance, it is possible to multiply the incoming signal by the carrier, times the square of another carrier 90° out of phase with it. This will produce a copy of the original message, and another AM signal at the fourth harmonic, by means of the trigonometric identity
The high-frequency component can again be filtered out, leaving the original signal.
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