Method and apparatus for measuring FM frequency deviation

Details Method and apparatus for measuring FM frequency deviation Method and apparatus for measuring FM frequency deviation

1995-09-15

1998-06-23

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455 671, 4552261, 375224, H04B 1700

Patent

active

057714436

ABSTRACT:
An FM input signal V(t) is A/D converted, then an in-phase component I and a quadrature component Q are obtained. Then, an instantaneous phase .theta.=tan.sup.-1 (Q/I) of the V(t) is obtained and also an instantaneous frequency of the modulated signal f.sub.a (t)=(1/2.pi.)d.theta./dt is obtained. Alternately, f.sub.a (t)=(IdQ/dt-QdI/dt)/{2.pi.(I.sup.2 +Q.sup.2)} is directly obtained from I and Q. A positive peak P+ and a negative peak P- of the obtained f.sub.a (t) is detected to display the average value of these as a frequency deviation.

REFERENCES:
patent: 3914693 (1975-10-01), Ohlen
patent: 4236110 (1980-11-01), Shearer et al.
patent: 4249257 (1981-02-01), Campbell
patent: 5001724 (1991-03-01), Birgenheier et al.

Affiliated with

Also associated with

Rating

Method and apparatus for measuring FM frequency deviation 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 and apparatus for measuring FM frequency deviation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring FM frequency deviation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1401604