GROUND NOISE FILTER - NOISE FILTER
Ground Noise Filter - Champion Oil Filter Guide - Variable Notch Filter
Ground Noise Filter
- background noise: extraneous noise contaminating sound measurements that cannot be separated from the desired signal
- A device for suppressing electrical or sound waves of frequencies not required
- A porous device for removing impurities or solid particles from a liquid or gas passed through it
- device that removes something from whatever passes through it
- A screen, plate, or layer of a substance that absorbs light or other radiation or selectively absorbs some of its components
- an electrical device that alters the frequency spectrum of signals passing through it
Noise Coupling in Integrated Circuits: A Practical Approach to Analysis, Modeling, and Suppression
This book provides a practical approach to the analysis of noise coupling and power integrity mechanisms, the implementation of suppression techniques, and the simulation using modeling and extraction tools. The overall goal is to improve the technical skills of engineers and technicians, enabling them to efficiently address noise coupling and power integrity problems at chip, package, and PCB levels.
Chapters 1 and 2 discuss fundamental concepts governing noise coupling and power integrity. Chapters 3, 4, and 5 focus on the physical mechanisms of noise generation, propagation and reception at the device, chip, package, and PCB levels. Chapter 6 focuses on measuring noise coupling and power integrity. Chapter 7 focuses on suppressing the noise coupling in integrated circuits. Advantages, disadvantages, and limitations of various techniques are presented with relation to the physical structures of devices and substrate. Chapter 8 focuses on modeling and simulating the noise coupling and power integrity in integrated circuits. The selection of conventional methods and tools is discussed, highlighting the advantages and limitations specific to various stages of the design flow.
About the Author:
Dr. Cosmin Iorga is the founder of NoiseCoupling.com. He has earned his Ph.D. in Electrical Engineering from Stanford University and has accumulated over 20 years of experience in high-speed analog circuit design and troubleshooting at system, board, and integrated circuit levels. Dr. Iorga holds 9 US patents covering innovative solutions in noise coupling reduction, power integrity, and signal integrity, and he teaches all technical courses and seminars offered by NoiseCoupling.com.
California Ground Squirrel
Explore for June 2, 2008 #381 - Thank you!
I've been trying to capture this squirrel for days. Today I managed to sneak up on it (which is pretty hard to do in a car). This area is disturbed by a road but still quite wild and the ground cover is quite high after our extensive spring rains. So it will always be partially obscured by plant matter.
Thanks to Red~Star for identifying this as a ground squirrel. I check them out on Wikipedia, and it seems to be a common California ground squirrel.
From Wikipedia (with a bit of editing by me):
"The California Ground Squirrel, Spermophilus beecheyi, is a common and easily observed ground squirrel of the western United States and the Baja California peninsula; it is common in Oregon and California and its range has relatively recently extended into Washington.
The squirrel's upperparts are mottled, the fur containing a mixture of gray, light brown and dusky hairs; the underside is lighter, buff or grayish yellow. The fur around the eyes is whitish, while that around the ears is black. Head and body are about 30 cm long and the tail an additional 15 cm. The tail is relatively bushy for a ground squirrel, and at a quick glance the squirrel might be mistaken for a Fox Squirrel.
As is typical for ground squirrels, California Ground Squirrels live in burrows which they excavate themselves. Some burrows are occupied communally. Although they readily become tame in areas used by humans, and quickly learn to take food left or offered by picnickers, they spend most of their time within 25 m of their burrow, and rarely go further than 50 m from it.
California Ground Squirrels are frequently preyed on by rattlesnakes. They are also preyed on by eagles, raccoons, red foxes, badgers, and weasels. The squirrels use a variety of techniques to reduce rattlesnake predation. Some populations of California Ground Squirrels have varying levels of immunity to rattlesnake venom as adults. Female squirrels with pups also chew on the skins shed by rattlesnakes and then lick themselves and their pups (who are never immune to venom before one month of age) to disguise their scent. Sand-kicking and other forms of harassment provoke the snake to rattle its tail, which allows a squirrel to assess the size and friskiness (dependent on blood temperature) of the snake.
Another strategy is for a squirrel to super-heat and swish around its tail. When hunting, rattlesnakes primarily rely on their pit organ, which detects infra-red. The hot-tail-swishing appears to convey the message "I am not a threat, but I am too big and swift-moving for it to be worth trying to hunt me." These two confrontational techniques also distract the snake from any nearby squirrel burrows containing pups.
Explore for June 2, 2008 #381 - Thank you!!
In the colder parts of their range, California Ground Squirrels hibernate for several months, but where winters are mild some squirrels are active year round. In those parts where the summers are hot they may also estivate for periods of a few days.
California Ground Squirrels are often regarded as a pest in gardens and parks, since they will feed off ornamental plants and trees."
So we are out on the first day of our holiday when the other half decides he needs to take a picture of a particularly good door knocker.
As he swings the camera bag down a lens comes flying out and hits the ground with a noise I do not want to hear again. Slowly himself picks up the lens and shakes it. It rattles most horribly. After about 30 seconds silence, for us both to process what has just happened and me to think, so this is why we take out insurance, I say - try taking the lens cap off just to see.
He does so with some difficulty and the filter is toast.
He removes the filter and the lens appears unharmed. No odd noises now and everything seems to move OK.
A wee while is then spent trying to remove every last bit of broken filter and then the final test does it still work on the camera - YES.
One totally perfect lens, one totalled filter.
ground noise filter
What further sets the DTI apart from other lesser isolation boxes is its connection versatility. We have provided XLR, 1/4" phone, and RCA type phono connections on all inputs and outputs. This allows it to easily fit into virtually any audio system and be the clean patch point between all types of systems. Whether you need an interface between a computer based audio workstation and your monitor system, isolation on long cable runs in a fixed installation, isolation of a signal source from your recording equipment, or in many cases, just a safer connection between two audio systems, the DTI can accommodate.
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