Patents Assigned to Electro-Physical Research, Incorporated
  • Hearing aid with modulated suppressed carrier signal
    Patent number: 4220830
    Abstract: Disclosed hearing aids have circuits that produce a suppressed-carrier modulated signal and they include an electrode to be applied to the head of the user for coupling the suppressed-carrier modulated signal to the user's auditory cortex.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: September 2, 1980
    Assignee: Electro-Physical Research, Incorporated
    Inventor: Curtiss R. Schafer