Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-07-03
1976-07-13
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328155, 307320, 333 17R, 333 70R, H03G 522
Patent
active
039696782
ABSTRACT:
Band pass filter circuit for a band pass filter which detects a phase difference between input and output signals of said band pass filter, and the detected output controls, via a low pass filter, a voltage controlled oscillator, the output of which controls first and second mixers connected respectively to an input side and an output side of the band pass filter, so that the output of the first mixer can be maintained at the center frequency of said band pass filter. Further, when an irregularly timed signal is received, before an input signal is pulled in the synchronized state, said band pass filter is provided with a wide pass band so as to pull the signal in the synchronized state in rapidly. After said input signal is pulled in said center frequency, the pass band of said band pass filter is changed to a narrow bandwidth so as to improve the quality of the noise and at the same time, a cutoff frequency of said low pass filter is changed to a lower frequency side so as to improve the stability of the band pass filter circuit.
REFERENCES:
patent: 3714588 (1973-01-01), Deboo et al.
patent: 3753159 (1973-08-01), Burwen
patent: 3786363 (1974-01-01), Lelie
patent: 3805173 (1974-04-01), Nakamura et al.
patent: 3835399 (1974-09-01), Holmes
Asahara Masaru
Nakamura Hiroshi
Ohyama Hiroaki
Toyonaga Noriyasu
Yoshizawa Ryushiro
Fujitsu Ltd.
Heyman John S.
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