Patents by Inventor Jean-Claude Lafon

Jean-Claude Lafon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hearing aid devices in which high frequency signal portions are transposed in low frequency compenstion signal portions
    Patent number: 4843623
    Abstract: The invention relates to a hearing aid device in which the slices (s.sub.1, x.sub.2) of the electrical signal corresponding to each acoustic signal comprised respectively between 1500 and 3500 Hz and between 5000 and 7000 Hz, are transposed into compensation signals (S.sub.1, S.sub.2) comprised within two coupled ranges of separate low frequencies above the range 60 to 800 Hz, alone preserved without compensation. To preserve the timbres of the transposed sounds, the compensation signals are obtained by multiplying each slice (x.sub.1, x.sub.2) by itself or by a signal (x'.sub.1, x'.sub.2) deduced from this slice by amplitude equalization.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: June 27, 1989
    Assignee: University De Franche-Comte
    Inventors: Jean-Claude Lafon, Tijani Gharbi