| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make it possible to correctly output a DTMF signal even when there occurs a change of a digit value during transmission of the DTMF signal in signal system conversion processing of the DTMF signal. <P>SOLUTION: A signal system conversion device according to the present invention includes: frequency superposition signal detection means for detecting a first frequency superposition signal based on an inputted audio signal; and signal creation means for creating a second frequency superposition signal of a predetermined signal system based on the first frequency superposition signal. When there occurs a change of a digit value in the case where it is determined that the second frequency superposition signal relating to the digit value before the change is currently being transmitted, after the second frequency superposition signal relating to the digit value before the change is outputted in its entirety, the signal creation means creates the second frequency superposition signal relating to the digit value after the change. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
