US 12,240,375 B2
Electronically controlled siren
Vincent S. Fleszewski, Crown Point, IN (US); Robert J. Hartke, Beecher, IL (US); Jeffery M. Loftus, Tinley Park, IL (US); and Christopher Radzik, New Lenox, IL (US)
Assigned to FEDERAL SIGNAL CORPORATION, Downers Grove, IL (US)
Filed by Federal Signal Corporation, Oak Brook, IL (US)
Filed on Dec. 22, 2022, as Appl. No. 18/145,268.
Claims priority of provisional application 63/266,529, filed on Jan. 7, 2022.
Prior Publication US 2023/0219492 A1, Jul. 13, 2023
Int. Cl. B60Q 1/34 (2006.01); B60Q 1/26 (2006.01)
CPC B60Q 1/346 (2013.01) [B60Q 1/2611 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A siren, comprising:
a motor;
a stator;
a rotor configured to be driven by the motor to spin relative to the stator, a spin speed of the rotor determining an attribute of a siren sound produced by the siren; and
a controller including a processor and memory, the memory encoding instructions which, when executed by the processor, cause the controller to modify the attribute of the siren sound by adjusting the spin speed.