| 摘要 |
A signal delay time measurement device outputs, to a sound space (260), a measurement signal sound (35) corresponding to a measurement signal such (211) as a pulse signal, and obtains a response signal (214) indicating a response thereof. By comparing the response signal (214) with a predetermined threshold (TH), the signal delay time measurement device measures a signal delay time (Td) in the sound space (260). The signal delay time (Td) in the above-mentioned sound space (260) includes a delay time other than the delay time caused by a transmission of a signal sound to the sound space, and the response signal (214) cannot theoretically reach the signal delay amount calculating unit (2) during the delay time. Therefore, the delay time calculating unit (2) does not perform the comparison in a no-response period in which the response signal (214) has not reached the delay time calculating unit (2) yet. Thereby, it can be prevented that the signal delay time (Td) is erroneously calculated by an effect of a background noise during the no-response period. |
