Lots of them use specific sounds and frequencies to induce desired states in the brain and have applications including anti-shoplifting, creating harmonious states in multiple humans and some can cause sexual arousal.
Remote system that transmits a specific radio wave signal designed to interfere with the brain's activity in a way that yields readable results as to the brain's state that can then be analysed.
Reduce the activity of the brain with sound waves at 4-16Hz.
A set of stimulus sound waves to induce multiple brain different states are referenced.
A more effective way to induce brain states using sound, I.E. by causing desired sleep states.
A patent on the synchronicity of converging tempos of recorded speech causing a specific positive emotional reaction.
Stimulating attentive brain states (like FM Theata) using a specific recorded sound superimposed on a 20hz sound wave.
Potentially evidence of speech parsing models in something that looks like a lie detector test or an assessment for psychological illness.
Portable acoustic device that can cause sleepiness, or sexual arousal etc.
Use things like music, from a traditional speaker or an LRAD, or any other existing vibrational mechanism, to cause "Harmonious States". Potentially a real version of Cupid's bow and arrow.
Using electrodes on the scalp to monitor and induce desired brain states.