| 摘要 |
<p>In containers for acoustic testing as known hitherto, which can function as small anechoic chambers, it has been difficult to attain a frequency-independent pressure field at the measurement point without simultaneously increasing the frequency dependence of th velocity field, whereby tests of objects which are partially pressure sensitive and partially velocity sensitive are vitiated by errors. An elongated acoustic test container consisting exclusively of curved surfaces and with space for an effective sound absorbent behind the test object overcomes this problem and at the same time provides improved acoustic insulation against low-frequency ambient noise. In a particularly expedient embodiment the container (1) is shaped like an egg supported by its narrow end on a base (2) and divided about two-thirds of the way up into a bottom (4) and a lid (5), whereof the latter contains a sound source (10).</p> |
