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PROBLEM TO BE SOLVED: To provide a position detection system capable of effectively preventing detection error for measurement voice.
SOLUTION: The position detection system comprises an audio device 2 and a terminal 3 for inputting voice signal using a microphone 3a. In the audio device 2, the measurement voice signals consisting of voice signals of two or more different frequencies are sequentially input in speakers SP1 and SPn. The notification signal representing that the voice of measurement voice signal has been taken is received from the terminal 3. Time t1 and time t2 are measured before the notification signal of measurement voice signal is received by a signal receiver after the voice of measurement voice signal is output from the speaker SP1 and speaker SPn. The time t1 and time t2 are used to calculate the position of the microphone 3a. The terminal 3 detects the voice signal exceeding a specified level input through the microphone 3a, as a component of the measurement voice signal for each frequency component of the measurement voice signal; and transmits a notification signal when the measurement voice signal is detected.
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