Abstract
A signal processing procedure especially suited for use in narrowband spectral analysis or 'line tracking' applications is presented. A modular approach is used which permits each tracker to optimize estimation parameters for the line assigned. The signal estimate from each module is used to cancel the corresponding signal from the common bus to which all tracker inputs are connected. A feedback arrangement around each module restores full level to each tracker of its own assigned input signal. Each signal being tracked is thus prevented from causing interference to any other tracker. The advantages are obtained from this arrangement are demonstrated and discussed.

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