Patent US10695528

a supporting member, configured to partially surround a head of a person so as to be held thereon, the supporting member having mounted thereon:

a plurality of electrodes, configured to be in contact with the person to capture one measurement signal representative of a physiological electrical signal of said person,

one acoustic transducer that emits an acoustic signal stimulating an inner ear of said person, and

embedded conditioning and control electronics that, in soft real-time, receive the measurement signal from the plurality of electrodes and control the emission by the acoustic transducer of the acoustic signal synchronized with a predefined slow brain wave temporal pattern,

wherein said embedded conditioning and control electronics are configured to, in soft real-time and with the supporting member of the device partially surrounding the head of the person:

capture the one measurement signal representative of the physiological electrical signal of the person, by means of the plurality of electrodes in contact with skin of the person;

receive said measurement signal by the embedded conditioning and control electronics; and

emit, via the acoustic transducer controlled by the embedded conditioning and control electronics, the acoustic signal synchronized with the predefined slow brain wave temporal pattern, wherein the embedded conditioning and control electronics, for emitting the acoustic signal via the acoustic transducer, are configured to:

determine, from the measurement signal, a slow brain wave temporal waveform, determine, from said slow brain wave temporal waveform, one temporal moment of synchronization between the predefined slow brain wave temporal pattern and a predefined temporal pattern of the acoustic signal, and

control the acoustic transducer to emit the predefined temporal pattern of the acoustic signal at said temporal moment of synchronization, and wherein, for determining said slow brain wave temporal waveform from said measurement signal, the embedded conditioning and control electronics are configured to:

determine a temporal waveform oscillating at an average slow brain wave frequency of the person, determine an instantaneous phase difference between said temporal waveform and the measurement signal, and

adjust an instantaneous phase of said temporal waveform according to an instantaneous phase of the measurement signal, based on said instantaneous phase difference.