Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-08-09
1978-01-10
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328162, 328167, 179 1P, 333 14, H04B 164, H03G 706, H03K 114
Patent
active
040681394
ABSTRACT:
A current variable shunt impedance with a non-linear control characteristic intended to functionally imitate and replace a field effect transistor responsive to a control voltage applied to its gate electrode having a source-drain path connected as a variable impedance shunt resistor in the variable frequency high pass filter section of the commercially popular Dolby B noise reduction system. The invention allows a large part of the Dolby B encode decode circuitry to be embodied in low-cost integrated circuit form while maintaining performance characteristics which closely match existing standards. These standards were previously established using noise reduction systems fabricated from discrete circuit components. The complementary nature of the encode and decode operations used to process a signal makes such matching of performance characteristics to the established standards critical.
REFERENCES:
patent: 3729693 (1973-04-01), Dolby
patent: 3829715 (1974-08-01), Van Sluys
patent: 3873945 (1975-03-01), Muraoka
patent: 3875537 (1975-04-01), Dolby
Fairchild Camera and Instrument Corporation
MacPherson Alan H.
Miller, Jr. Stanley D.
Reitz Norman E.
Woodward Henry K.
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