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What is the effect of image frequency on performance of the receiver?
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What are the peaks and valleys called on waves?
Crest and trough Image commons.wikimedia.org/wiki/File:Crest_trough.svg
Name all the categories of the EM spectrum?
The categories of the electromagnetic (EM) spectrum, in the ascending order of their frequencies are:RadioMicrowaveInfraredVisibleUltravioletX-rayGammaHence, Radio waves have the lowest frequency and the longest wavelengths while Gamma rays have the highest frequency and the shortest wavelengths.(check related link for an image)
Why the eye can still form an image after the lens has been removed?
the lens in your eye adjusts its breaking index to make the image sharp, the cells in the back of your eye register the light coming in. so if you removed the lens, these cells would still receive the image, it just wouldn't be a sharp image.
What is an image your brain perceives even through no light rays pass through the image?
A Virtual Image
How does ultrasonic receiver work to produce an ultra sound scan?
It uses this thing called a Phase Array. The phase array has many ultrasonic transducers built into it. The phase array shoots of each sound beam in a sequence to produce an artificial angle. The angle of the beam, the frequency, amplitude, and delay are all determined by seeing which combination of settings produces the best image. It works as the same principle as echo location used on submarines. You bounce a sound beam off of something and wait for the back reflection. But it gets a little more complicated because you are using more advanced transducers, higher frequencies that send and receive more signals per second, and have a computer that interprets the data of all the signals received and converts that into an image.
If a radio station is tuned at 1600 kHz what is the image frequency?
Assuming that the receiver uses a high-side local oscillator and an IF of 455 KHz, the image frequency is 910 KHz above. When tuned to 1600 KHz, the image frequency would be 2,510 KHz.
What is double spotting in communication or in receivers?
The phenomenon of the same stations getting picked up at two nearby points on the receiver dial is call double spotting. It is caused by inadequate image frequency rejection.
What is the function of the RF amplifier?
rf is a single tuned amplifier . Its functions are :- 1.improves selectivity ( i.e rejection of unwanted signal) , so that it prevents heterodyning which results in interference frequency. 2. improves image frequency rejection 3. improves sensitivity ( gain of amplifier ) 4.improves coupling of receiver with antenna . 5. improves signal to noise ratio. 6. reradiation of local oscillator through receiver antenna is prevented
What is the effect of quantization on image?
You get Jaggies
How image frequency affect in mixer?
Quick Answer [Knowledge req.]We want to tune into station A, when we do, our radio receiver will mix this desired Station A frequency (RF) with it's Local Oscillator (LO). The process of multiplting two time domain signals generates signals at sum and difference frequencies (where the IF is the difference frequency). This implies that any signal whose frequency differs from the LO by the same amount that the RF does, will also impose its self on the same IF. E.G. if RF = LO - IF, then the signal at LO + IF will also downconvert and apear at IF. This signal (in this case LO + IF) is called the image frequency IM. and must be attenuated (perhaps by an image rejection filter) prior to mixing.Where the example above applies to high-side LO injection (LO > RF) the same is true for low-side LO injection (LO < RF).
What is an image map?
It involves making an image where each section of the image has a different(or no) effect when clicked/moused over.
How to calculate image frequency?
f (image) = 2 * f (local oscillator) + fc ................. if f ( l.o ) > fc f (image) = 2* f (local oscillator) - fc
What is an AV receiver used for?
An AV receiver is used as part of a home entertainment system. It will amplify the sound, as well as provide an image signal so you can watch and listen to your television.
What is filtering in image processing?
A filter is an effect that can be added to an image that affects the overall appearance, or apearance of a selected area, of an image.
Which uses high-frequency sound waves to make an image of a developing fetus?
ultrasound
What is is still image in drama?
A still image in drama is were a cast is preforming and you pause in a dramatic scene for a few seconds then carry on with the performance.
What is filter in digital image processing?
A filter is an effect that can be added to an image that affects the overall appearance, or apearance of a selected area, of an image.
