Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-11-26
1978-03-07
Lieberman, Eli
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
330103, 330108, H03H 710, H03H 714, H03F 132, H03G 920
Patent
active
040782158
ABSTRACT:
An electronic filter circuit having controlled "Q" with variations in attenuation. A plurality of filter networks are connected in parallel between the output and the input of an amplifier in a manner such as to be capable of selectively providing negative feedback to the amplifier. Each filter network includes inductive, capacitive and resistive elements, with a potentiometer forming part of the resistance thereof. Each potentiometer is connected in series with a resistor having the same value thereas, the arm of the potentiometer being connected to its associated filter network such that the "cut" to which the potentiometer is set determines the total value of the resistance presented by the filter network in the feedback circuit. The potentiometers and associated resistors are each connected in series with each other, these series connected elements being connected in parallel between the input and the output of a unity gain amplifier. With the potentiometers in the "flat" positions, the feedback signals are zero and thus have no effect on the output of the main amplifier. Various amounts of frequency responsive attenuation are provided by various settings of selected potentiometers.
REFERENCES:
patent: 2907838 (1959-10-01), Ross
patent: 4002994 (1977-01-01), Fender
Altec Corporation
Lieberman Eli
Nussbaum Marvin
Sokolski Edward A.
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