Frequency discriminator and frequency modulator incorporating su

Details Frequency discriminator and frequency modulator incorporating su Frequency discriminator and frequency modulator incorporating su

1980-10-20

1983-01-04

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328134, 329 50, 331 27, H03D 302, H03D 1300, H03L 708

Patent

active

043674445

ABSTRACT:
An input signal is mixed with a reference frequency and with a frequency 90.degree. phase-displaced from the reference frequency, so as to produce resultant waveforms whose slopes are dependent on the respective frequency differences detected. Both waveforms are differentiated to produce respective slope signals. Two comparisons are then carried out: one comparison compares the sign of one slope signal with the sign of the waveform producing the other slope signal, and the second comparison compares the sign of the other slope signal with the sign of the waveform producing the first slope signal. The two comparisons produce nominally identical intermediate signals having values dependent on the difference between the input and reference frequencies. Control means operative in dependence on the relative magnitudes of the two waveforms then selects the intermediate signals alternately, each selected intermediate signal constituting the output signal of the circuit. Each intermediate signal is selected as the output signal for a respective period of time for which there are no transitions in the signals from which the respective comparison produced it.

REFERENCES:
patent: 3393380 (1968-07-01), Webb et al.
patent: 3568067 (1971-03-01), Williford
patent: 3748590 (1973-07-01), Gray

Affiliated with

Also associated with

Rating

Frequency discriminator and frequency modulator incorporating su 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 discriminator and frequency modulator incorporating su, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency discriminator and frequency modulator incorporating su will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1583815