| 摘要 |
PROBLEM TO BE SOLVED: To control a terminal to reduce a speech output level from an added function unit at the time of transmitting and receiving control information to a base station by providing a speech output level reduction control means. SOLUTION: A control part 6 is provided with a transmission control part 601. The transmission recognizing part 601a of the part 601 recognizes transmission and receiving of a control signal generated in the middle of the operation of a radio unit 14 and a radio sound volume adjust-control part 601b adjust- controls the volume of a radio. Then after the finish of transmission, the volume of the radio is adjust-controlled again. Namely, at the time of transmitting/ receiving control information with respect to a base station during the operation of a radio unit 14, a speech output level from an earphone microphone set 17 is reduced. Thereby, noise, etc., offensive to the ear, which is caused by the influence of the transmitting/receiving radio wave of control information.
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