FR2913605A1 - Sleep inducing device for physical person, has filtering units for filtering sound of audio having spectrum of specific kilohertz, where cut off frequency of sound varies in given time and given demand - Google Patents

Abstract

The device has filtering units for filtering sound of audio having spectrum of 8 kilohertz, where cut off frequency of the sound varies from 300 Hertz to 8 kilohertz in a given time and a given demand. The units are operated based on a variable high-pass filter (1), with characteristics that change over time. The filter depends on a frequency of a variable clock (3) obtained from a voltage controlled oscillator (2).

Description

The device of the invention is intended to gradually bring a subject

  or a physical person from a waking state to a state of sleep. Prior art relating to this subject does not provide the minimum relaxation threshold for falling asleep effectively and profitably - this in the audio field.

  Figure 1 Audio-Progressive Filtering

  Figure 2 Sound intensity restitution curve, as a function of time

  Figure 3 X = spectral mass X '= relaxation T = lag time Y = time Y' = time

Figure 4 Electronic Device

  The solutions to be provided during the signal processing are: a) to preserve the availability of the subject's nervous circuit and the accumulation of the different types of fatigue (physical, psychological, neurological, energetic); b) from the beginning of the signal processing, the low frequencies are progressively eliminated; so-called discharge sounds (viscerality, ego, unconscious). This is to avoid psychosomatic counter-reactions (125 Hz, 1000 Hz); c) to ensure in return a gradual reduction of the spectral mass, of the energy density to be managed (feeling of appeasement and relief) (Fig. 3); d) create a link, by a psycho-acoustic effect allowing sonic travel, through the progressive and total sampling of the audio spectrum (from 300 Hz to 8 kHz).

  The principle used in this area is the gradual closure of an audio spectrum from low to high, on a variable time scale on demand. At the triggering of the processing system, the sound is integral with a total bandwidth, then, from 300 Hz and gradually, the frequency spectrum contains less and less serious, medium, until the decrease of this spectral entirety . A mask filters the total sampling of frequency windows, over the spectral scale from 300 Hz to 8 kHz, in a given time and variable on demand (Fig. 1).

  The diagram (Fig. 2) gives the curve of restitution of the sound intensity as a function of the frequencies for different instants in time.

  The right part of the curve remains fixed at 8 kHz; the slope is 12 dB per octave (5). The left part of the curve slides progressively from 300 Hz to high frequencies, up to 8 kHz, to 36 dB per octave (6). This to reinforce the perceptual phenomenon.

  The system for progressive filtering of the audio signal is provided by an electronic device (block diagram - Fig. 4). The functionality of the system is based on the use of a variable high pass filter (1) whose characteristics change over time. The cutoff frequencies gradually vary between 300 Hz and 8 kHz, on demand, preferably from 1 s to several minutes. This high pass filter with switched capacity depends on the frequency of the clock (3). This variable clock frequency is obtained from a voltage controlled oscillator (converter, voltage, frequency) (2).

  Other filters provide noise rejection of the clock (Fig. 4).

Claims (1)

  1-Device for gradually bringing a person from a waking state to a state of sleep, characterized in that it comprises means for progressive sound filtering, an audio signal (progressive closure of the sound spectrum up to 'at 8 kHz), whose cutoff frequencies gradually vary from low to high (from 300 Hz to 8 kHz), in a given time and variable on demand.