Digital noise cancellation in a metal detector

Details Digital noise cancellation in a metal detector Digital noise cancellation in a metal detector

1987-12-29

1989-08-08

Weiss, John

Harvesters

Motorized harvester

With condition-responsive operation

324233, 340572, A01D 7518

Patent

active

048541133

ABSTRACT:
A method and apparatus for cancelling cyclically recurring noise induced in a magnetic metal detector by movement of ferrous machine parts in the field of the detector provides for periodically sampling the output of the metal detector, delaying each sample for the duration of one cycle of the cyclically recurring noise, and subtracting the samples taken in one cycle from the output of the metal detector during the following cycle. The delay is accomplished by a delay line or shift register, or by storing the samples under microprocessor control. If the noise has a first component occuring at a first rate and a second component occuring at a second rate cancellation of both components may be accomplished.

REFERENCES:
patent: 3896608 (1975-07-01), Garrott
patent: 3959953 (1976-06-01), Garrott
patent: 3972156 (1976-08-01), Bennett
patent: 4168496 (1979-09-01), Lichtblau
patent: 4531118 (1985-07-01), Beams
patent: 4639666 (1987-01-01), Strosser et al.
patent: 4677384 (1987-06-01), Payne
patent: 4709213 (1987-11-01), Podhrasky

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