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

摘要

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).