Extracting carrier signals from modulated signals

摘要

Methods, systems, and apparatus for detecting a center frequency of an input signal, the input signal including a carrier signal modulated with a modulation signal. Detecting a frequency of a second signal. Determining a difference signal between the center frequency of the input signal and the frequency of the second signal. Modifying the frequency of the second signal based on the difference signal to provide the carrier signal. And, outputting the carrier signal.

主权项

1. A signal receiver comprising:
at least one processor; and a data store coupled to the at least one processor having instructions stored thereon which, when executed by the at least one processor, causes the at least one processor to perform operations comprising:
receiving an input signal, the input signal comprising a carrier signal modulated with a transpositional modulation (TM) signal and a non-TM signal;detecting a center frequency of the input signal;detecting a frequency of a second signal;determining a difference between the center frequency of the input signal and the frequency of the second signal;modifying the frequency of the second signal based on the difference between the center frequency of the input signal and the frequency of the second signal until the second signal represents the frequency of the carrier signal;separating the TM signal from the non-TM signal, anddemodulating the TM signal using the second signal.