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Substitution of a Delay Line for a Whole Bank of Filters

IP.com Disclosure Number: IPCOM000093925D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Peckels, J: AUTHOR [+2]

Abstract

The system is a method for elaborating the signal response of a bank of filters to pulse signals applied to said bank at sampled times.

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Substitution of a Delay Line for a Whole Bank of Filters

The system is a method for elaborating the signal response of a bank of filters to pulse signals applied to said bank at sampled times.

Delay line D of total delay T is constituted by n segments of delay tau. The two characteristics T and Tau are chosen such that tau is the sampling interval yielding a good definition of the shortest impulse response, e.g., the highest frequency filter response. T is the length needed to represent the longest impulse response, e.g., the lowest frequency filter response. Thus n is T/tau. Let 1...n be taps taken from D. Each tap is connected to a resistor. The tap taken from i is connected to resistor Ri for example. All resistors R1...Rn are combined into a summing network epsilon. Computer C controls the various dimensions p1...pn to be given R1...Rn.

Assume that the first filter response to be synthesized is written as phi 1 (t) = alpha 11(T)+ alpha 21 (2 tau) +...alpha n1 (n tau). Tau, 2 Tau...n Tau being the sampling instants. The second filter response being similarly written as phi 2(t)= alpha12(T)+ alpha 22(2 tau)+....alpha n2(n Tau). The nth filter response is phi n(t)= alpha 1n(Tau)+ alpha 2n(Tau)+....alpha nn(n tau). The values for alphaij, i =
1...n, j = 1...n, are either positive, negative, or zero. Now, from waveform analysis there is obtained the slowly varying digitally stored results k1....kn which can be used to represent the final waveform that is f(t) = k1...