Hi Trev; Having no real interest in electricty per se; But I have been near High Transmission lines, by chance I even got a personal tour of a coal generating plant on Lake Erie back in the late 70's. At the time what I heard or the effects it had on me I though was the same for everyone. As far as I know what I hear at those sites is the same as everyone. Maybe I can get my husband to give me a describtion of what he hears at some of these sites. I will state again what I hear is not a electrical mains hum - It is The Microwave Auditory Effect - Pulsed Electromagnetics from Telecommunication Towers. I'm just not sure if Low Frequency as in Acoustics is applicable. For some reason I think it has more to do with the particles of light energy - I am having trouble putting it into words. I haven't been able to get sleep for two days now, and I have cleaning and work to do and all I want to do is read about the physics of electromagnetics and light, how screwed-up is that. Patty
On Apr 29, 4:27 am, Trev <[email protected]> wrote: > Interesting- nature has always got there first! > I wonder how accurate [and also how sharp a roll off] the 100 Hz > lower cut-off point is , though? - as this is critically above what > many people get as Hum- around mains frequencies of 50 or 60 Hz, > depending where they live round the globe. > Mine is a bit less than this- so the LF sensitivity is important in > evaluating Hum factors here. > > On Apr 28, 10:56 pm, patty <[email protected]> wrote: > > > > > > > Hi dboots; The cochlea is the only human organism capable of > > responding to the pulsed electromagnetics. > > Thanks and take care > > Patty > > > On Apr 24, 9:02 pm, dboots <[email protected]> wrote: > > > > Soumyajit Mandal, who designed the chip to mimic the cochlea, which > > > uses fluid mechanics, piezoelectrics and neural signal processing to > > > convert sound waves into electrical signals that are sent to the > > > brain. > > > "The cochlea quickly gets the big picture of what is going on in the > > > sound spectrum," said Sarpeshkar. "The more I started to look at the > > > ear, the more I realized it's like a super radio with 3,500 parallel > > > channels > > > >http://www.eetimes.com/news/semi/rss/showArticle.jhtml?articleID=2177... > > > > Researchers tout RF chip that mimics the inner ear > > > > John Walko > > > EE Times Europe > > > (06/04/2009 8:13 AM EDT) > > > > LONDON — Researchers at the Massachusetts Institute of Technology > > > (MIT) have developed a fast, low-power radio chip imitating the human > > > inner ear, or cochlea. > > > > The radiofrequency chip RF cochlea (in article encrytion squares > > > around RF cochlea) > > > is capable of picking up mobile phone, GPS, radio, internet and > > > Bluetooth signals and, the researchers suggest, could enable wireless > > > devices to receive cell phone, wireless Internet, FM radio and other > > > signals. > > > According to the engineers, the RF cochlea chip is faster than any > > > human-designed radio-frequency spectrum analyzer and also operates at > > > a lower power. > > > The MIT team was led by Rahul Sarpeshkar, associate professor of > > > electrical engineering and computer science, and his graduate student, > > > Soumyajit Mandal, who designed the chip to mimic the cochlea, which > > > uses fluid mechanics, piezoelectrics and neural signal processing to > > > convert sound waves into electrical signals that are sent to the > > > brain. > > > "The cochlea quickly gets the big picture of what is going on in the > > > sound spectrum," said Sarpeshkar. "The more I started to look at the > > > ear, the more I realized it's like a super radio with 3,500 parallel > > > channels." > > > The RF cochlea, embedded on a silicon chip measuring 1.5mm by 3mm, > > > detects the composition of any electromagnetic waves within its > > > perception range. > > > It'is said to consume about 100 times less power than that required > > > for direct digitization of the entire bandwidth, the researchers say. > > > They suggest this makes it desirable as a component of a cognitive > > > radio, which could receive a broad range of frequencies. > > > Sarpeshkar and his students describe the device in a paper to be > > > published in the June issue of the IEEE Journal of Solid-State > > > Circuits . They have also filed for a patent to incorporate the RF > > > cochlea in a software radio architecture that is designed to > > > efficiently process a broad spectrum of signals. > > > The paper notes that as sound waves enter the cochlea, they create > > > mechanical waves in the cochlear membrane and the fluid of the inner > > > ear, activating hair cells (cells that cause electrical signals to be > > > sent to the brain). > > > The cochlea can perceive a 100-fold range of frequencies -- in humans, > > > from 100 to 10,000 Hz. Sarpeshkar used the same design principles in > > > the RF cochlea to create a device that can perceive signals at million- > > > fold higher frequencies, which includes radio signals for most > > > commercial wireless applications. > > > This is not the first time Sarpeshkar has drawn on biology for > > > inspiration in designing electronic devices. His MIT group previously > > > developed an analogue speech-synthesis chip inspired by the human > > > vocal tract and an analysis-by-synthesis technique based on the vocal > > > tract. The chip's potential for speech recognition and voice > > > identification has applications in portable devices and security > > > applications. > > > He is also working on projects inspired by signal processing in cells, > > > and has worked on hybrid analogue-digital signal processors inspired > > > by neurons in the human brain. > > > "Humans have a long way to go before their architectures will > > > successfully compete with those in nature, especially in situations > > > where ultra-energy-efficient or ultra-low-power operation are > > > paramount," Sarpeshkar said. > > > Reference : Mandal, S.; Zhak, S. M.; Sarpeshkar, R. A Bio-Inspired > > > Active Radio-Frequency Silicon Cochlea. IEEE Journal of Solid-State > > > Circuits, 2009; 44 (6): 1814-1828 DOI: > > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "Hum Sufferers" group. > > > To post to this group, send email to [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]. > > > For more options, visit this group > > > athttp://groups.google.com/group/hum-sufferers?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Hum Sufferers" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group > > athttp://groups.google.com/group/hum-sufferers?hl=en.-Hide quoted text - > > > - Show quoted text - > > -- > You received this message because you are subscribed to the Google Groups > "Hum Sufferers" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/hum-sufferers?hl=en.- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. 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