ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,549,136, issued on Feb. 10, was assigned to OHM Audio LLC (Dalton, Mass.).
"Preamplifier system" was invented by Stephen Hopkins Keech (Dalton, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A noise-reducing preamp system includes: a power supply circuit configured to provide electrical power to the noise-reducing preamp system and including a 0 volt reference; a signal amplification circuit including: a preamplifier circuit having an external reference input terminal and configured to receive an analog input signal, and a variable gain controller circuit configured to control the gain of the preamplifier circuit, wherein the signal amplification ...