Fecha de publicación: 08/12/2022 Fuente: WIPO (eseential oils OR extracts) An information processing device according to one aspect of the present art comprises a signal processing unit. The signal processing unit extracts, from a plurality of observation signals acquired by a group of microphones, aural signals respectively relating to the microphones by machine learning. Thus, a desired signal can be outputted. Furthermore, a person at the other end of the line can easily catch a speaker's voice, and the conversation is isolated from voices of other speakers, thereby providing a feeling of security and high confidentiality for a user.