Frequency adjusting method for use with digital receiver and fre

Details Frequency adjusting method for use with digital receiver and fre Frequency adjusting method for use with digital receiver and fre

1997-09-15

2000-04-18

Le, Amanda T.

Pulse or digital communications

Receivers

Automatic frequency control

4551922, 4551822, H04L 2706

Patent

active

060524197

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.

REFERENCES:
patent: 4453136 (1984-06-01), Kelland
patent: 4932072 (1990-06-01), Toko
patent: 5335364 (1994-08-01), Heinonen
patent: 5513388 (1996-04-01), Suganuma
patent: 5574998 (1996-11-01), Andoh
patent: 5727030 (1998-03-01), Miyashita

Affiliated with

Also associated with

Rating

Frequency adjusting method for use with digital receiver and fre does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency adjusting method for use with digital receiver and fre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency adjusting method for use with digital receiver and fre will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2342561