Digital Lock-Loop Frequency Offset Correction and Display Apparatus.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
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The patent application describes a digital lock-loop frequency offset correction apparatus for detecting and correcting variations in R.F. input signals in order to hold the R.F. input signals centered in a narrow band receiver system. The digital lock-loop frequency offset correction apparatus eliminates a search routine by comparing the received signal with a locally generated standard. The detected error signal controls a frequency synthesizer which acts as a second local oscillator to keep the R.F. signal centered in the second I.F. stage.
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