21. Hydrosalpinx, or fallopian tube dilation, can be mistaken for an ovarian cyst due to its anechoic appearance. 22. The building also has several acoustics labs including two anechoic chambers and a reverberation chamber for performing acoustics research. 23. Some people feel unsettled when they first experience an anechoic chamber due to the sudden absence of this phenomena. 24. Some developers eschew anechoic chambers in favor of specific standardized room setups intended to simulate real-life listening conditions. 25. The Royal Navy started using anechoic tiles in 1980, when the was fitted with them during its second refit. 26. Building 20 also housed one of the first anechoic chambers, where research was performed by acoustics pioneer Leo Beranek. 27. Anechoic foam is great for the higher frequency but for the pedal drum and bass no good at all.28. HRTFs are typically measured in an anechoic chamber to minimize the influence of early reflections and reverberation on the measured response. 29. The U-boat anechoic tile rubber coating, one layer of which contained circular air pockets to defeat ASDIC sonar. 30. Since 1974 Paul Barton of PSB Speakers used the NRC's world-class measurement facilities, their anechoic chamber.
