Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-04-16
1993-11-02
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328160, 307527, 379394, 379398, H04B 330, H04B 340
Patent
active
052587134
ABSTRACT:
An impedance generator, especially suitable for determining a terminating impedance of an active impedance telephone line interface circuit, comprises a subtracting circuit for forming a difference between an input voltage multiplied by a multiplier and a high pass filtered version of the difference multiplied by another multiplier, and a summing circuit for combining the input voltage multiplied by a further multiplier with a low pass filtered version of said difference to produce an output voltage. In one arrangement, the input voltage multiplied by the further multiplier constitutes a third input to the subtracting circuit. The high pass filtered version of the difference is produced by subtracting the output of a low pass filter from the difference. The multipliers are constituted by controllable gain elements, enabling the generated impedance to be easily programmed under digital control.
REFERENCES:
patent: 3537015 (1970-10-01), Jackson
patent: 3638037 (1972-01-01), McMurtrie
patent: 4004102 (1977-01-01), Ott
patent: 4011530 (1977-03-01), Carver
patent: 4086540 (1978-04-01), Delagrange
patent: 4317963 (1982-03-01), Chea, Jr.
patent: 4387273 (1983-06-01), Chea, Jr.
patent: 4433213 (1984-02-01), Albers et al.
patent: 4484032 (1984-11-01), Rosenbaum
patent: 4764956 (1988-08-01), Rosch et al.
patent: 4866767 (1989-09-01), Tanimoto et al.
Muller, K. F. "Impedanz-- und Symmetrieverhalten der analogen Teilnehmeranschlussschaltung", Nachrichtentechnik Elektronik vol. 39, No. 4, pp. 126-128, XP66762, Berlin, 1989.
Patent Abstracts of Japan, vol. 009, No. 274 (E-354), Oct. 31, 1985 and JP,A 60 117 989 (Nippon Denki KK), Jun. 25, 1985.
Boyd Graeme B.
Feeley Mark P. J.
Rosch Reinhard W.
Haley R. John
Heyman John S.
Northern Telecom Limited
Riley Shawn
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