Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-03-25
1978-09-05
Olms, Douglas W.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307261, 328133, 323101, H04H 500
Patent
active
041122593
ABSTRACT:
A stereo FM pilot signal generator which includes an automatic phase correction loop so as to automatically synchronize the phase between the pilot signal and the stereo switching signal. A parallel clocked divider/decoder is included for generating a 38 kHz square wave, to be used in a stereo switching modulator, and a 19 kHz square wave so that the two square wave signals are substantially in phase synchronism with one another. The 19 kHz square wave is directed through a controllable phase adjuster and then through a filter which serves to remove higher harmonics therefrom so that only the fundamental, 19 kHz sine wave signal remains. The phase of the 19 kHz square wave signal is compared with the phase of the 19 kHz sine wave signal by a phase comparator which provides a control signal to the phase adjuster, and which adjusts this control signal until the 19 kHz sine wave is substantially in phase synchronism with the 19 kHz square wave. In addition, a specific phase comparator is described which includes two flip-flops which are respectively responsive to lead and lag between two input signals.
REFERENCES:
patent: 3328688 (1967-06-01), Brooks
patent: 3660607 (1972-05-01), Mack
patent: 3750035 (1973-07-01), Crow
patent: 3789323 (1974-01-01), Andersen et al.
patent: 3821652 (1974-06-01), Wiebe et al.
patent: 3896268 (1975-07-01), Streed
Harris Corporation
Olms Douglas W.
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