| 摘要 |
The present invention provides an acoustic display device for displaying modal patterns in response to sound from a sound source. The display device 10 has a substantially circular housing 12, which housing 12 includes a continuous curved side wall 13a, a substantially flat base wall 13b, and open end 13c. The open end 13c is closed by diaphragm 14, thereby forming closed chamber 15. Excitation of the diaphragm can be effected by introducing vocal sounds to the underside of the diaphragm via one of a plurality of sound connecting means 22 that include a flexible tubular section 30, which terminates in a mouthpiece 32. A user can place the mouthpiece over their mouth and nose and make vocal sounds, which are delivered to the interior of the chamber 15. The mouthpiece 32 can be substituted with a sound collector 60 having a "horn" shape and an annular flange for engagement with a loudspeaker. The other ends 24 of the sound connecting means 22, within the closed chamber 15, each contain a non-return valve so that pressure within the chamber is maintained. The device can also include weight locating means 21a, 21b, 21c or magnetic tensioning means 80, 84 for tuning the diaphragm. Removable covers having different markings can assist in analysing the patterns produced. Two or more integral curved spirit levels 38 in conjunction with adjustable feet 40 enable accurate levelling of the diaphragm.
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