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1. (WO2018132772) MAGNETIC FIELD CANCELING AUDIO SPEAKERS FOR USE WITH BURIED UTILITY LOCATORS OR OTHER DEVICES

Pub. No.:    WO/2018/132772    International Application No.:    PCT/US2018/013669
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Sat Jan 13 00:59:59 CET 2018
IPC: H04R 1/24
G01V 3/08
Applicants: OLSSON, Mark
MEREWETHER, Ray
Inventors: OLSSON, Mark
MEREWETHER, Ray
Title: MAGNETIC FIELD CANCELING AUDIO SPEAKERS FOR USE WITH BURIED UTILITY LOCATORS OR OTHER DEVICES
Abstract:
Magnetic field cancelling audio speakers and associated devices are disclosed. In one embodiment, a utility locator includes an audio speaker device with two loudspeaker drivers positioned and electrically connected to reduce emitted magnetic fields over a range of fre-quencies corresponding with locator sensing frequencies.