ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,451,151, issued on Oct. 21, was assigned to Digital Voice Systems Inc. (Westford, Mass.).
"Tone frame detector for digital speech" was invented by Thomas Clark (Westford, Mass.) and John C. Hardwick (Acton, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Tone data embedded in a voice bit stream that includes frames of non-tone bits and frames of tone bits is detected and extracted by selecting a frame of bits, analyzing the selected frame of bits to determine whether it is a frame of tone bits, and, when it is a frame of tone bits, extracting tone data from it. Analyzing the selected frame includes comparing bits of the selected frame to sets of to...