Steam Posted March 18, 2014 Posted March 18, 2014 So your significant other had put a coffee table in the middle of your listening room messing up your imaging. Well now you can apply an acoustic cloak to sonically hide it. http://www.dailytech.com/Duke+Turns+Plastic+Pyramid+Into+Acoustic+Cloaking+Device/article34511.htm More seriously this could lead to some very sophisticated room treatments as discussed at the end.
BradC Posted March 19, 2014 Posted March 19, 2014 Have you found out what bandwidth the cloak worked over?
Steam Posted March 19, 2014 Author Posted March 19, 2014 Not sure about the bandwidth. Would probably have to drag out the nature materials article to find that out. If anyone is really curious I could download it.
frankn Posted March 19, 2014 Posted March 19, 2014 The article said 3 cycles, and at 3KHz it worked out to be Quote : The cloak (red region) was designed to cover, at 3 kHz, a hollow square pyramid (blue thin sheet) 34.3 cm (3λ) long and 5.7 cm tall (0.5λ), placed on the ground. λ is the wavelength in air at the design frequency. The cloak shares the… Might be a bit limited atm 1
BradC Posted March 19, 2014 Posted March 19, 2014 most of the metamaterials developed so far are resonant structures and hence have limited bandwidth of operation. There are a few exceptions, but I haven't looked at the paper yet. Covering the full audio bandwidth is a difficult problem for any device. The analogy in EM is like having a radio that worked from VHF to mm wave (3 orders of magnitude)
Recommended Posts