Signal tuning with variable intermediate frequency for image rejection and methods

The invention relates to signal tuning with variable intermediate frequency for image rejection and methods. In a method and apparatus for operating a super-heterodyne receiver, a tuning circuit has a local oscillator for frequency shifting a desired channel to a selected frequency and a controller...

Full description

Saved in:
Bibliographic Details
Main Authors TRYHUB JOHN, GREGGAIN LANCE, CHENG GARY, JANTZI STEPHEN A
Format Patent
LanguageChinese
English
Published 14.11.2012
Subjects
BASIC ELECTRONIC CIRCUITRY
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION
TUNING RESONANT CIRCUITS
Online AccessGet full text

Cover

More Information
Summary:The invention relates to signal tuning with variable intermediate frequency for image rejection and methods. In a method and apparatus for operating a super-heterodyne receiver, a tuning circuit has a local oscillator for frequency shifting a desired channel to a selected frequency and a controller for controlling the local oscillator. The controller determines for each of a number of identified channels, whether an image signal is present at frequencies in the spectrum that when tuned to a first selected frequency interfere, and is operable to select a modified selected frequency at which interference between the image signal and the identified channel is reduced.
Bibliography:Application Number: CN2011805760