Method for automatically searching a frequency range for signal

Details Method for automatically searching a frequency range for signal Method for automatically searching a frequency range for signal

1997-10-01

2000-03-14

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551612, 4551642, 4551641, 4552261, H04Q 720

Patent

active

060384336

ABSTRACT:
A method for automatically searching a frequency range for signal channels in a receiver for digitally modulated signals is described, each channel having a center frequency, a symbol rate, and a modulation type. The method comprises the steps of scanning the frequency range in first frequency steps corresponding with just less than half the minimum expected symbol rate of the channels, measuring the RF level at each frequency step and comparing the measured RF value with a threshold value, and, if the measured RF value is below the threshold value, continuing said scanning and measuring steps until the frequency range is fully scanned, and, if the measured RF value is above the threshold value, assuming the corresponding frequency as an indication of a digitally modulated signal channel and scanning a frequency area in second frequency steps to determine the edge frequencies of the channel, said second frequency steps being much smaller than said first frequency steps, determining the center frequency of the channel from said edge frequencies, and continuing said scanning and measuring steps for further signal channels until the frequency range is fully scanned.

REFERENCES:
patent: 4594611 (1986-06-01), Sugibayashi et al.
patent: 5087977 (1992-02-01), Suizi
patent: 5299011 (1994-03-01), Choi
patent: 5303400 (1994-04-01), Mogi
patent: 5479214 (1995-12-01), Sakakibara et al.
patent: 5621767 (1997-04-01), Bradt et al.
patent: 5640696 (1997-06-01), Ishikawa et al.
patent: 5822686 (1998-10-01), Lundberg et al.

Affiliated with

Also associated with

Rating

Method for automatically searching a frequency range for signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for automatically searching a frequency range for signal , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for automatically searching a frequency range for signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-178142