Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1979-10-03
1981-08-25
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328137, 328138, 328153, 307524, H03K 906, H03K 526, H04L 2726
Patent
active
042862213
ABSTRACT:
A multi-frequency signal receiving apparatus for receiving signals with at least more than two frequencies and selectively separating these signals, comprising a first maximum value detecting means for detecting the maximum value of the rectified outputs of a plurality of channel filters provided for said signals to be selected; a second maximum value detecting means for detecting the maximum value of the rectified outputs at the intermediate stage of two channel filters for discriminating the signals at both ends of the signal frequency bands of a plurality of said channel filters; and a comparison means for comparing the outputs of said first and second maximum value detecting means with an appropriate weight and thereby detecting the presence or absence of the signal to be detected; whereby based on the result of comparison, the threshold value of discriminators placed at the succeeding stage of said channel filters for discriminating the predominant frequency signal is controlled. The invention thus permits the elimination of input filers, and realizes an economical and reliable signal receiver.
REFERENCES:
patent: 3555435 (1971-01-01), Vosteen
patent: 3747025 (1973-07-01), Iten et al.
patent: 3805171 (1974-04-01), Drumheller
patent: 3812432 (1974-05-01), Hanson
patent: 4017742 (1977-04-01), James
Heyman John S.
Hitachi , Ltd.
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