Why is there a Patent for Subliminal Acoustic Manipulation of the Nervous System? Patent # 6017302A. Silent Sound Subliminal Mind Control. 1. Steady tone, near the high end of the hearing range, say, 15,000 Hz. 2. Hypnotist's Voice, varying from, say, 300 Hz to 4,000 Hz. 3. Frequency Modulator Voice Controls Freq. 4. Output is now more or less a st