Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-05-02
1976-07-27
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 37, 307221D, 307295, 329126, 333 18, H04B 1500, H03B 104
Patent
active
039719987
ABSTRACT:
Disclosed is a recursive circuit capable of serving as a signal detector or as a signal generator. The circuit comprises a shift register capable of storing multilevel signals, and a feedback network responsive to an input signal and to the output signals of selected stages of the shift register. In the feedback network, the output signals of the selected stages are each multiplied by prechosen integers, and then added with the input signal to form a sum signal which is applied to the first stage of the shift register. The sum signal is developed by nonmodulo addition, and the multiplying integers are prechosen to cause the characteristic function of the circuit to be a cyclotomic polynomial. Detection of the presence in the input signal of a signal having a chosen frequency is accomplished by the sum signal excluding a predetermined threshold level. Signal generation is accomplished by presetting the register to a nonzero state and allowing the output signal to develop in accordance with the characteristic function of the circuit.
REFERENCES:
patent: 3490049 (1970-01-01), Choquet et al.
patent: 3546490 (1970-12-01), Sangster
patent: 3654563 (1972-04-01), Hesler et al.
patent: 3718863 (1973-02-01), Fletcher et al.
patent: 3723911 (1973-03-01), Forney
patent: 3740591 (1973-06-01), Butler et al.
patent: 3912916 (1975-10-01), Grun et al.
IBM Tech. Disclosure Bul., p. 183, vol. 7, No. 3-8/1964, "Adjustable Digital Matched Filter," by Blasbalg et al.
Gopinath Bhaskarpillai
Kurshan Robert Paul
Bell Telephone Laboratories Incorporated
Heyman John S.
Logan H. L.
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