Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree.
All signal processing devices, both analog and digital, have traits that make them susceptible to noise. Noise can be random or white noise with an even frequency distribution, or frequency-dependent noise introduced by a device's mechanism or signal processing algorithms.
In electronic recording devices, a major type of noise is hiss created by random electron motion due to thermal agitation at all temperatures above absolute zero. These agitated electrons rapidly add and subtract from the voltage of the output signal and thus create detectable noise.
In the case of photographic film and magnetic tape, noise (both visible and audible) is introduced due to the grain structure of the medium. In photographic film, the size of the grains in the film determines the film's sensitivity, more sensitive film having larger sized grains. In magnetic tape, the larger the grains of the magnetic particles (usually ferric oxide or magnetite), the more prone the medium is to noise. To compensate for this, larger areas of film or magnetic tape may be used to lower the noise to an acceptable level.
One of the Earth's resources is oil (and other fossil fuels.) Prices are going up! Up and up and up! We are consistently over 60 dollars a barrel now, electric costs are rising as a result, and so is paying at the pump.
How do we stretch out resources to ease the strain on our pocketbook...
Here is one more I am having a problem with:
4x^2y'' + 4xy' + (4x^2 - 1)y = 0, x > 0
one solution is
y1(x) = sin(x)* x-1/2
but when I try to work it all out with another linearly indep. solution
y2(x) = u(x) sin(x) * x-1/2
the order does not reduce and the y'' is huge... so I...
Hi,
Please could someone explain why it is that the cross section of water emerging from a tap decreases with tap distance ... is it due to air resistance acting to form some kind of aerodynamic shape? any thoughts would be much appreciated!
Can anybody direct me to a discussion on the effects of a sudden reduction of the Earth's gravity - say by 50%? Purely speculative, of course. I'm assuming its orbit around the sun would be essentially unchanged, but that the moon would recede or maybe head off on its own merry way. Any other...
We call reactions in which one species experiences both oxidation and reduction Disproportionation - but why do we chose this particular name?
Thanks. :smile:
Logic Systems Boolean Reduction Question!
Ok i received an assignment due on monday and have to idea how to get started...i am supposed to design a traffic light using the following criteria:
a) The east west (E-W) traffic light will be green whenever both lanes C and D are occupied.
b) The...
Digital Electronics Boolean Reduction! Help Please
Ok i need to figure out how to reduce this I've been working on it for 2 days straight and can't figure it out...please help...its due tommorow :uhh: :cry:
(ab)(\overline c + \overline d)+(a+b)(\overline c \overline d)
What type of bumper, made only of one sheet of paper and masking tape, would be most effective in a collision between a wooden block and a 1 kg cart? I have experiment with several designs including cylinders, spring-like compression bumpers and square pyramids, but none seem to work very well...
In the very first pages of "Quantum Mechanics" by Landau & Lifchitz, the measurement process is described as an interaction between a quantum system and a "classical" system.
I like this interpretation since any further evolution of the quantum system is anyway entangled with the "classical"...
Okay, if...
The Earth's gravity was 1/6 of what it normally is, then would I be correct to assume that objects being thrown up with the same velocity will stay in the air 6 times as long? If not, what's the relationship? Thanks.
I'm trying to find an integration reduction formula for the following equation:
{{I}_n}=\int _{0}^{2}{{\big(4-{x^2}\big)}^n}\delta x
Any indication on how to begin would be much appreciated as I've tried many different approaches but all have ended in failure.
Thanks
I am a kinetic sculptor in need of some gear reduction help. I have a 2250 rpm .5 hp electric motor. i need to reduce the rpms to less than 5. the gear drive will turn a 30" plywood wheel, and it must turn slowly. the electric motor is the only one I have, so i must use it. I have a small...
Although on the whole my Boyce & DiPrima book is fairly good in of itself and compared with others, but of-coarse some areas are lacking.
vt'' - 3v' = 0
I suppose I integrate twice, but then what?
I am in the process of writing a report on the Physics of Jet engines and I have come across a problem I cannot comprehend. In the exhaust of many jet engines they allow the atmospheric air to mix with the air from the engine to reduce exhaust noise. From what I understand this allows the...
Can anyone help me with this. I am asked to solve the following matrix with Row Red. Algorithm,
[ a 3 (1+a) | -a ]
[ 1 a 3 | -2a]
[ 1 1 1 | 0 ]
I get to something like
[ 1 1 1 | 0 ]
[ 0 a-1 2 | -2a]
[ 0 3-a 1 | -a]
but what do I do now?
Hello,
I was curious if anyone could explain to me the simple procedure/guidleines to carrying out oxidation (half-reactions), reduction (half-reactions) and overall net reactions. I've read my Chem book over and over, but I don't quite understand it. Even a pointer to a good site with a...
If a vehicle could continuously cool the air in front of it and heat the air behind it, the air in front should contract and the air behind expand, reducing the pressure in front of the vehilce and increasing it behind the vehicle. This should pull the vehicle into the cooler air at the front...