tag:blogger.com,1999:blog-6970502759702586204.post6917577523361635043..comments2024-03-25T03:59:31.089+00:00Comments on Behind The Barred Window: Instituting a RĂ©gime of Strict Discipline Through Harnessing the Psychoacoustic Effects of Infrasound to Facilitate Behavioural ModificationToyntanenhttp://www.blogger.com/profile/01964511433148028640noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6970502759702586204.post-4711758882296181042015-11-12T02:21:01.456+00:002015-11-12T02:21:01.456+00:00There is a related concept that actually works: ht...There is a related concept that actually works: https://en.wikipedia.org/wiki/The_Mosquito and http://www.freemosquitoringtone.org/Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6970502759702586204.post-19169490016275751482015-10-13T09:05:51.885+01:002015-10-13T09:05:51.885+01:00Hi again Frise
The thing is, we tend to sense inf...Hi again Frise<br /><br />The thing is, we tend to sense infrasound within the body rather than with the ears which just don't function at those low frequencies. So what we are talking about is more like vibration than sound in a way, even though it is transmitted through the air, and for that it needs to be pretty intense (analogous to 'loud'). <br /><br />Now to reproduce a sound with any kind of efficiency a speaker system would need huge enclosures and very big drivers (speakers), especially in an enclosed space of limited dimensions. I have no idea how the CIA were generating their infrasound, but it was being used outdoors which removes one of the obstacles right away. <br /><br />It's a matter of physics. Yes you can use clever speaker enclosure design to boost low frequencies - all manner of 'wave guide' ducts, cavities and ports - using a relatively compact speaker enclosure design, but what the manufacturers are really doing is introducing tailored resonance to combat the otherwise sharp frequency response roll-off at the low frequency end of the thing's natural range. One of the problems with today's compact designs is their inefficiency. To reach the sound pressure levels at say 60Hz or so we used to get from our big boxes fitted with 12 inch Goodmans base speakers (woofers)driven by perhaps 15-20 watts RMS back in the day nowadays would require 100-150 watts per channel to drive modern neat compact bass units. And a lot of the military experiments - if I remember rightly - were carried out down at 4-5Hz rather than 17Hz. <br /><br />So no, you wont get a useable level of infrasound out of your home cinema system no matter what signal source you use - and you only need a test bench signal generator as a signal source in order to produce a decent sine wave down to below 1 Hz (the low frequency oscillators on my modular analogue music synthesiser - there are three - each produce nice clean sine waves down to 0.2 Hz!). <br /><br />And why does the signal source have to be a sine wave (and a very pur one at that)? Simple dimple - at any sensibly high output the human ear would easily hear the harmonics contained within any more complex waveform such as a sawtooth or square wave. <br />Toyntanenhttps://www.blogger.com/profile/01964511433148028640noreply@blogger.comtag:blogger.com,1999:blog-6970502759702586204.post-34617419869760321452015-10-13T05:03:56.711+01:002015-10-13T05:03:56.711+01:00A home cinema sub woofer is reasonably price and c...A home cinema sub woofer is reasonably price and could maybe emit infrasound given the proper input signal and amplifier... Also I thought I read somewhere that the CIA used infrasound combined with loud Rock & Roll music, to get the former president of Panama, Noriega, out of his compound. So action at a distance may be possible.Frisehttps://www.blogger.com/profile/02126474780161988505noreply@blogger.com