| 摘要 |
<P>PROBLEM TO BE SOLVED: To save time and labor in performing measurement by many microphones necessary in a multichannel reproduction acoustic field configured by a plurality of loudspeakers in which it is necessary to detect a height of each of the loudspeakers so that the heights of virtual sound fields in an elevation angle direction become uniform. <P>SOLUTION: A sound signal output from a loudspeaker 111 is picked up by using a first microphone 101 and a second microphone 102. A signal analyzer 105 detects a direct wave and first reflection waves from the picked-up voice data, and a first reflection wave from a floor direction is selected out of the plural first reflection waves by using time relationship for the direct wave. The height of the loudspeaker 111 is calculated from arrival time of the selected first reflection wave and the height of the first microphone 101. <P>COPYRIGHT: (C)2012,JPO&INPIT |
