The cortical hearing aid is an instrument that produces the sensation of hearing by electrical stimulation of the neurons in the auditory cortex and/or auditory nerve trunk (eighth cranial nerve). The device employs an oscillator that generates a radio frequency carrier at a selected frequency within the range of 20 KHz to 60 KHz, with about 40 KHz producing optimum effectiveness. The RF carrier is modulated by the audio signal. An unbalanced bridge modulator is utilized to produce a modulated signal having substantially improved bandwidth and fidelity.
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