US 12,464,292 B1
Magnetic field cancelling audio devices
Ray Merewether, La Jolla, CA (US); and Mark S. Olsson, La Jolla, CA (US)
Assigned to SeeScan, Inc., San Diego, CA (US)
Filed by SeeScan, Inc., San Diego, CA (US)
Filed on Apr. 17, 2023, as Appl. No. 18/135,677.
Application 18/135,677 is a continuation of application No. 17/493,824, filed on Oct. 4, 2021, granted, now 11,641,553.
Application 17/493,824 is a continuation of application No. 16/773,952, filed on Jan. 27, 2020, granted, now 11,146,892, issued on Oct. 12, 2021.
Application 16/773,952 is a continuation of application No. 15/870,787, filed on Jan. 12, 2018, granted, now 10,555,086, issued on Feb. 4, 2020.
Claims priority of provisional application 62/445,711, filed on Jan. 12, 2017.
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 9/06 (2006.01); G01V 3/08 (2006.01); H04R 1/24 (2006.01); H04R 1/28 (2006.01); H04R 3/12 (2006.01); H04R 5/02 (2006.01); H04R 9/02 (2006.01); H04R 19/01 (2006.01)
CPC H04R 9/063 (2013.01) [G01V 3/081 (2013.01); H04R 1/24 (2013.01); H04R 1/2811 (2013.01); H04R 9/025 (2013.01); H04R 19/013 (2013.01); H04R 3/12 (2013.01); H04R 5/02 (2013.01); H04R 2209/022 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A shielded audio locator system, comprising:
a buried utility locator for sensing magnetic field signals emitted from a hidden or buried utility as a result of current flowing therein and determining information about the hidden or buried utility from the sensed magnetic field signals; and
a shielded audio module, comprising:
an enclosure;
input wiring including terminals or connection points for connection to an audio output signal from the buried utility locator;
a first electromagnetic audio driver having terminals operatively coupled to the input wiring to receive the audio output signal; and
a second electromagnetic audio driver having terminals operatively coupled to the input wiring to receive the audio output signal.