State determination method, state determination device, state determination system, and recording medium

A state determination system for determining a state of a care recipient, the state determination system comprising:

• a vibration detection device including a detection section using a sheet-like vibration sensor and an output section outputting an electrical signal according to a detected vibration by the detection device, the detection section being placed on an upper surface or a lower surface of a mattress of a bed used by care recipient;
• and
• a state determination device including a computer that includes a control section, a recording section, an input section that receives input of the electrical signal, and a communication section, wherein
• the recording section records a program to cause the computer to perform:
• rectification processing to rectify the electrical signal;
• envelope detection processing to derive an envelope from the rectified electrical signal;
• and
• determination processing to determine the state of the care recipient according to the derived envelope,
• the determination processing determines, as the state of the care recipient, a position of the care recipient from among a plurality of positions by comparing a value indicated by the derived envelope to a plurality of threshold values, the plurality of positions including at least a lying position and a sitting position,
• the plurality of predetermined threshold values includes (i) a bed-entry determination threshold value to determine a bed-entry motion of the care recipient and (ii) a get-up determination threshold value to determine a get-up motion of the care recipient who is in a bed, and
• the bed-entry determination threshold value is set to a value larger than the get-up determination threshold value,
• the state determination system further comprises a communication device communicably connected to the state determination device via a communication network,
• the communication section of the state determination device transmits information on the determined position of the care recipient to the communication device via the communication network, and
• the communication device includes an output section that outputs the received information determined position of the care recipient as at least any of:
• light output;
• image display;
• audio output;
• ringing;
• and vibrating.