Patent No. 4877027 Hearing system
Patent No. 4877027       Hearing system (Brunkan, Oct 31, 1989)        Abstract   Sound is induced in the head of a     person by radiating the head with microwaves in the range of 100 megahertz to     10,000 megahertz that are modulated with a particular waveform. The waveform     consists of frequency modulated bursts. Each burst is made up of ten to twenty     uniformly spaced pulses grouped tightly together. The burst width is between     500 nanoseconds and 100 microseconds. The pulse width is in the range of 10     nanoseconds to 1 microsecond. The bursts are frequency modulated by the audio     input to create the sensation of hearing in the person whose head is irradiated.  Get EMF Protection Today!    Notes:    The apparatus of FIG. 1 for carrying     out my invention may include as a microwave generator Model PH40K of Applied     Microwave Laboratories and described as Signal Source. The cable 21 connecting     the microwave generator 19 and the antenn...