[1] Lloyd Trammell, Elon Ray Coats and Michael V. Powers filed for a patent on "Acoustic modeling apparatus and method" on September 3, 2002.
Lloyd Trammell and Elon Ray Coats filed for a patent on "Methods and apparatus for sub-harmonic generation, stereo expansion" on October 4, 2004.
Peavey Electronics Corporation, developed a sub-harmonic generator, called KOSMOS, based on patent 7,171,002 that avoids flat, cardboard sounding characteristics common to this type of process.
The Peavey Kosmos is a low-frequency energy and stereo image enhancement system that produces deep low end while adding clarity and definition to any audio source.
Always on the lookout for cutting-edge digital and analog signal processing products, Serafine notes, "The Kosmos Pro is the best and most versatile tool for sub-harmonic frequency generation that I've come across in my 22 years in the sound design business.