Eating and drinking action detection apparatus and eating and drinking action detection method

Abstract

The eating and drinking action detection apparatus: acquires vibration produced from inside of a body of a subject and generates a vibration signal corresponding to the vibration; divides the vibration signal into each frame to calculate power of the vibration signal for each frame; determines, for each frame, whether the frame is a stationary signal having a periodicity or a non-stationary signal having no periodicity; detects, based on the power of each frame and a determination result for each frame whether the frame is the stationary signal or the non-stationary signal, a period of the non-stationary signal being continued while the power of the vibration signal is equal to or larger than a power threshold, acquires a continuation time of the period; and determines, based on the continuation time, whether the subject performed swallowing or mastication in the period of the non-stationary signal being continued.

Description

technical field [0001] For example, the present invention relates to an eating behavior detection device and a eating behavior detection method for detecting a subject's eating behavior. Background technique [0002] In the past, studies have analyzed the behavior or state of a person based on signals such as a person's voice. As one of such studies, techniques have been proposed to detect eating behaviors of a subject such as swallowing or chewing based on vibrations generated in the subject's body (for example, refer to Patent Documents 1 to 3). [0003] For example, Patent Document 1 discloses a utterance / eating state detection system that determines a utterance state or an eating state based on output data obtained by arithmetically processing an output signal from a body sound microphone that detects body sound. The utterance and eating state detection system determines the eating state when the energy of the fundamental frequency component of the output data at a pred...

AI Technical Summary

Problems solved by technology

In such a case, in the technique disclosed in Patent Document 1, since both the chewing state and the swallowing state are included within a predetermined time period, swallowing may be misjudged as chewing, and swallowing and chewing may not be recognized.

In addition, in the technology disclosed in Patent Document 2 and the technology disclosed in Patent Document 3, the recognition of mastication and swallowing is not targeted.

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