Patent ID: 7988613

Claim:
An apparatus for generating frequencies related to sleep and alert states, comprising: a circuit configured to produce, at an output of the circuit, a pulsed DC signal having a frequency, wherein the frequency falls within a range of brain wave frequencies that includes a plurality of segments, the plurality of segments including a delta segment, a theta segment, an alpha segment and a beta segment, each of the delta, theta, alpha and beta segments corresponding to a respective subrange of the brain wave frequencies; a frequency controller, coupled to the circuit, configured to change the frequency of the pulsed DC signal from a first frequency to a second frequency, wherein the second frequency is within a second one of the plurality of segments, and wherein the first frequency is a non-zero frequency outside of the second one of the plurality of segments; and a coil, coupled to the output of the circuit, configured to generate a magnetic field from the pulsed DC signal.