Dr. Sharp's basic method is shown in Appendix PM6, below. A Frey-
type audible pulse was transmitted every time the voice waveform
passed down through the zero axis, a technique easily duplicated by
ham radio operators who build their own equipment.
A pattern seems to be repeated where research which could be used for
mind control starts working, the UNclassified researchers lose funding,
and in some cases their notes have been confiscated, and no further
information on that research track is heard in the unclassified press.
Pulsed microwave voice-to-skull research is one such track.

Illustration showing the principle behind pulsed microwave voice-to-skull
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