Patent ID: 7136684

Claim:
A headset with a radio communication function comprising: a microphone configured to detect a speech of a wearer and generate a first speech signal; a transmission and reception unit configured to transmit the first speech signal by a short range radio communication, and receiving a second speech signal returned in response to the first speech signal by the short range radio communication; a time information acquisition unit configured to acquire a time information indicating occurrence times of the first speech signal and the second speech signal; an information production unit configured to produce a recording information to be stored in which the time information is set in correspondence to the first speech signal and the second speech signal; and a memory unit configured to store the recording information produced by the information production unit, wherein the time information acquisition unit includes: a clock radio receiving unit configured to receive a reference radio signal on which information on a current time is conveyed; and a time extraction unit configured to extract the current time from the reference radio signal.