Electrical filters

Details Electrical filters Electrical filters

1974-10-10

1976-07-06

Chatmon, Jr., Saxfield

328109, 328149, 328162, 328165, H03B 100, H03B 104, H03K 500, H04B 110

Patent

active

039684482

ABSTRACT:
An electrical filter for extracting from an applied input signal a pseudo-random sequence signal contained in the input signal comprises: an analogue delay line; means for applying to the input of the delay line an input signal containing the pseudo-random sequence signal; feedback means for producing a feedback signal in response to the signals appearing at two or more points along the length of the delay line; and combining means for combining said feedback signal with said input signal; said feedback means being constructed in dependence on said pseudo-random sequence so that, at the input of the delay line, said pseudo-random signal in said input signal is reinforced by said feedback signal.

REFERENCES:
patent: 2760011 (1956-08-01), Berry
patent: 2908812 (1959-10-01), Laurent
patent: 3081434 (1963-03-01), Sandberg
patent: 3237111 (1966-02-01), Coates, Jr. et al.
patent: 3659229 (1972-04-01), Milton
patent: 3810067 (1974-05-01), Heidecker
"Analysis and Synthesis of Delay Line Periodic Filters," by Urkowitz, The Transactions on Circuit Theory; CT-4, No. 2, June 1957, pp. 41-53.

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