Signal tuning with variable intermediate frequency for image rejection and methods
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United States of America Patent
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Nov 10, 2015
Grant Date -
Jul 14, 2011
app pub date -
Jan 11, 2011
filing date -
Jan 11, 2010
priority date (Note) -
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Abstract
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.
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