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US 5,399,976 AGranted
Group delay estimate system using least square fit to phase response ramp
AssigneeHewlett-Packard Company
InventorJay M. Wardle
Life of this patent
Estimating the term…
Abstract
The phase response of a network is measured at uniform frequency intervals. A linear regression analysis is performed on samples of the phase response measured at frequencies within an aperture centered on a group delay frequency to obtain an estimate of the group delay of the network at that frequency. The process is repeated for a sequence of group delay frequencies to determine a trace of the group delay of the network across a range of frequencies.
Claims8
A method of measuring the group delay of a network, comprising:
- exciting the network with a stimulus signal;
- measuring the phase response of the network at a plurality of uniformly spaced frequencies to yield a plurality of phase response samples;
- performing a least mean squared error analysis on a number of the phase response samples measured at non-zero frequencies within a frequency aperture to determine an estimate of the group delay of the network at a selected frequency, the estimate of the group delay of the network being variant with frequency;
- and
- repeating the step of performing a least mean square error analysis on a plurality of sets of phase response samples to determine estimates of the group delay of the network at a sequence of selected frequencies.
2 more elements
Dependencies are inferred from the claim text.