| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hands-free calling system of a portable speech communication machine with a simplex speech communication function which dissolves the problems such as the obstruction of work by a cable, a fault by cable disconnection, and the danger of the work, improves convenience, and prevents faults and accidents. <P>SOLUTION: The hands-free calling system includes: a portable speech communication machine body 1 having the simplex speech communication function for switching a transmission/reception state and performing speech communication; the PTT remote controller 2 performing short distance radio communication with the portable speech communication machine body 1 and transmitting PTT signals for switching the transmission/reception state by pressing a PTT button 21, to the portable speech communication machine body 1; and a speaker microphone terminal 3 connected with the PTT remote controller 2 through a cable or a short distance radio communication unit. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
