Frequency adjusting method for use with digital receiver and frequency adjusting circuit thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Sep 15, 1997
filing date -
Sep 27, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frequency adjusting circuit for use with a digital receiver is disclosed, the circuit comprising a means (mixers 3 and 4) for converting the frequency of a received digital signal into an intermediate frequency signal, a local oscillator (VCOs 7 and 8 and PLLs 9 and 10) for supplying a local oscillation signal to the frequency converting means, and a frequency adjusting means (20) for calculating a frequency deviation of the intermediate frequency signal (D1) for each sample, performing a predetermined calculation corresponding to the measured value, and controlling the oscillation frequency of the local oscillator corresponding to the obtained calculated value, wherein the frequency adjusting means compensates the calculated value corresponding to a receiving electric field intensity of the intermediate frequency signal. The frequency adjusting means includes a means (calculating portion 23) for detecting a variation value of the receiving electric field intensity, comparing the deviation value with a threshold value, and when the variation value is larger than the threshold value, removing the frequency deviation at that time from those that are input from the frequency adjusting means.
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