Person detection system, utterance system, and person detection method

A person detection system comprising:

• an obtainer that obtains a signal strength of a radio wave transmitted by each of a plurality of transmitters and received by an antenna;
• and
• a processing unit that performs a detection process of detecting whether a person is present in a vicinity of the antenna, based on the signal strengths obtained by the obtainer, wherein
• in the detection process, the processing unit detects that the person is present in the vicinity of the antenna when each of the signal strengths obtained by the obtainer regarding, among the plurality of transmitters, two or more transmitters deviates from a normal range.

A person detection method comprising:

• obtaining a signal strength of a radio wave transmitted by each of a plurality of transmitters and received by an antenna;
• and
• performing a detection process of detecting whether a person is present in a vicinity of the antenna, based on the signal strengths obtained, wherein
• each of the plurality of transmitters is classified into any one of a plurality of groups according to a position of the transmitter with respect to the antenna, and
• in the detection process, the person is detected to be present in the vicinity of the antenna when each of the signal strengths obtained regarding, among the plurality of transmitters, two or more transmitters classified into a same group among the plurality of groups deviates from a normal range.