Accession Number : ADD002757

Title :   Digital Lock-Loop Frequency Offset Correction and Display Apparatus.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Greci,Anthony

Report Date : 17 May 1976

Pagination or Media Count : 12

Abstract : 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.

Descriptors :   *Frequency stabilizers, Digital systems, Radiofrequency, Corrections, Receivers, Narrowband, Doppler effect

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE