Title: Electrical filters

Abstract: A filter performs a dual filtering function by connecting an input terminal through a first impedance such as a resistor to a first output terminal. The input terminal is connected to a virtual earth at the input to a current amplifier through the first impedance and a second impedance such as a tuned circuit. The output of the amplifier is connected to a second output terminal and also to ground through a third impedance such as a resistor. The characteristics at the first and second output terminals may be complementary band stop and band pass characteristics.

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Inventors: Spencer, Paul Anthony (London, EN)

Application Number: 515843
Filing Date: 1974-10-18
Publication_date: 1976-01-13
Assignee: Dolby Laboratories, Inc. (New York, NY)
Primary Class(es): 327/552 327/310, 327/595, 330/126, 333/166, 348/624, 348/663
Other Classes:
US Patent Ref:

2217839	Oct, 1940	Grundman	330/126.
3325753	Jun, 1967	Shearer et al.	330/126.
3531652	Sep, 1970	Aemmer et al.	333/76.

Other Refs:
Primary Examiner: Mullins, James B.
Assistant Examiner:
Attorney: O'Connell; Robert F.