Frequency determining and lock-on system

Details Frequency determining and lock-on system Frequency determining and lock-on system

1984-07-16

1985-09-17

Heyman, John S.

Boots, shoes, and leggings

364571, 324 77A, 375 10, 455226, 377 8, G06M 900, G01R 2300, G01R 2900

Patent

active

045424705

ABSTRACT:
An apparatus for automatically determining the predominant frequency of an unknown signal occurring in a known frequency spectrum that is many times larger than the unknown signal. The system searches the known frequency spectrum, determines and locks on to the one useful frequency that results in closed loop servo operation about the single stable null point which matches the unknown signal frequency. The lock-on occurs when a validation signal is generated based on the vector sum of two time delayed signals that are filtered reconstructions of the unknown signal. When this technique is applied to counting plural stacked objects using the apparatus of U.S. Pat. No. 4,373,135, it is possible to accomodate large mis-settings of velocity and sensor width.

REFERENCES:
patent: 3641515 (1972-02-01), Sues
patent: 4372166 (1983-02-01), Loveland
patent: 4408284 (1983-10-01), Kijesky
patent: 4471445 (1984-09-01), Pernick

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