Patent ID: 8376964

Claim:
An apparatus for analyzing a sleep structure according to non-restrictive weight detection, the apparatus comprising: first through fourth or more weight detection means installed respectively on the four legs of an equipment, which can be slept in, and configured to detect a target person's weight in a non-restrictive manner; a controller configured to detect information about sleep of the target person by detecting variation in the target person's weight measured by the weight detection means when the target person sleeps, and analyze a sleeping pattern of the target person and a sleeping pattern that indicates whether the sleeping person sleeps or is awake; first through fourth amplifiers for amplifying respectively signals measured by the first through fourth weight detection means; first through fourth low-pass filters for outputting low-pass filtered signals that belong to signals amplified by the first through fourth amplifiers; first through fourth high-pass filters for outputting high-pass filtered signals that belong to the signals amplified by the first through fourth amplifiers; and a multiplexer configured to select any one from among the outputs of the first through fourth low-pass filters and the first through fourth high-pass filters under control of the controller, wherein the controller detects a body weight value of the target person and a location of a center of gravity based on outputs of the first through fourth low-pass filters, and determines an extent of movement based on the location of the center of gravity, thus determining the sleeping pattern, wherein the controller measures variation and intensity in the target person's movement and detects variation in position and heartbeat characteristics, based on outputs of the first through fourth high-pass filters, thus determining the sleeping pattern, wherein the first through fourth amplifiers are respectively provided with the first through fourth low-pass filters and the first through fourth high-pass filters, wherein the multiplexer is a 8-bit multiplexer, wherein the controller measures the intensity by equation that the output values of the first through fourth high-pass filters are squared, the sum of the outputs of the first through fourth high-pass filters is calculated and the square root of the sum is extracted, wherein the controller measures the variation in the target person's movement by comparison between predetermined reference value and the intensity measured, for the predetermined time period.