US 12,232,235 B2
Pillow speaker relay circuit, pillow speaker, and method for same
Daniel J. MacDonald, East Amherst, NY (US)
Assigned to Curbell Medical Products, Inc., Orchard Park, NY (US)
Filed by Curbell Medical Products, Inc., Orchard Park, NY (US)
Filed on Apr. 16, 2021, as Appl. No. 17/233,414.
Prior Publication US 2022/0338326 A1, Oct. 20, 2022
Int. Cl. H05B 47/12 (2020.01); A47G 9/10 (2006.01); E06B 9/68 (2006.01); H04R 1/02 (2006.01); H04R 1/04 (2006.01)
CPC H05B 47/12 (2020.01) [A47G 9/1045 (2013.01); H04R 1/028 (2013.01); H04R 1/04 (2013.01); E06B 9/68 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for determining a presence of a relay in a pillow speaker, comprising:
sampling a voltage of a relay drive line to detect a first feedback state;
providing a control signal to activate the relay drive line;
sampling a voltage of the relay drive line during activation of the relay drive line to detect a second feedback state; and
comparing the first feedback state and the second feedback state to detect a presence of a relay if the first feedback state and the second feedback state are different.