US 12,068,731 B2
Amplifier power attenuator and closed loop operation
Anthony T. D'Amore, Camarillo, CA (US); and Juan Rodriguez, Mesa, AZ (US)
Assigned to D'Amore Engineering, LLC, Gilbert, AZ (US)
Filed by D'Amore Engineering, LLC, Camarillo, CA (US)
Filed on Aug. 10, 2022, as Appl. No. 17/884,697.
Prior Publication US 2024/0056045 A1, Feb. 15, 2024
Int. Cl. H03F 3/183 (2006.01); G06F 3/16 (2006.01); H03G 3/30 (2006.01); H04R 3/02 (2006.01)
CPC H03G 3/3005 (2013.01) [G06F 3/162 (2013.01); H03F 3/183 (2013.01); H04R 3/02 (2013.01); H03F 2200/03 (2013.01); H03G 2201/106 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier power attenuator, comprising:
a microcontroller that receives an amplified audio feedback signal from an audio amplifier driving a loudspeaker;
a variable impedance optocoupler in communication with the microcontroller, wherein the variable impedance optocoupler receives an audio signal from an audio source;
an impedance selector in communication with the microcontroller, wherein the impedance selector defines an impedance of the loudspeaker; and
a maximum power set-point control in communication with the microcontroller, wherein maximum power set-point control defines a maximum power set-point of the loudspeaker,
wherein the microcontroller controls the variable impedance optocoupler to attenuate the audio signal and output an attenuated audio signal to the audio amplifier, and
wherein the microcontroller attenuates the audio signal based on: the amplified audio feedback signal, the impedance, and the maximum power set-point.