The amplitude modulation synchronous detection is to mix the original carrier signal with a signal that generates the same frequency as the original carrier and a signal that is phase shifted by 90 degrees.
The sound signals of USB+LSB and USB-LSB are detected, and the latter Cosway mixed component is then phase-shifted by 90 degrees, and then the USB sound signal and the LSB sound signal are respectively obtained after the former and the difference synthesis. You can achieve the goal by selecting the side without the confusion.
In addition, the synchronized signal and the original banner signal will be mixed to obtain a new signal containing DC components and high frequency components and USB and LSB sound components. The DC and high frequency components are eliminated by capacitors and low-cycle filters. The sound component of the sideband is probably the origin of the word synchronous detection.
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