US Patent Issued to ST R&DTech on Feb. 25 for "Method and device for spectral expansion of an audio signal" (British, American Inventors)

ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,236,971, issued on Feb. 25, was assigned to ST R&DTech LLC (Delray Beach, Fla.).

"Method and device for spectral expansion of an audio signal" was invented by John Usher (Beer, Great Britain) and Dan Ellis (New York City, N.Y.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and device for automatically increasing the spectral bandwidth of an audio signal including generating a "mapping" (or "prediction") matrix based on the analysis of a reference wideband signal and a reference narrowband signal, the mapping matrix being a transformation matrix to predict high frequency energy from a low frequency energy envelope, generating an energy envelope ...