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the signal goes out of sink due to refraction
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∙ 13y ago
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Why is modulation necessary before multiplexing?
modulation means transmitting the signal which is to be transmitted along with the carrier wave, then at the receiver it is separated from the carrier and demodulated. So modulation is needed so as to transmit the signal over long distances with higher accuracy. Hence it is required before multiplexing.
What is the purpose of carrier signal in modulation?
Carrier signal is of high frequencies, it gives strength to the original signal because original signal cannot travel long distances so it needs to be strengthen a bit for transmitting. The carrier signal is a high frequency signal, called an RF. Radio Frequency signal, it is to high for the human or animal ear to detect it, so its outside the audible spectrum and can easily be transmitted over the air to receivers that is tuned to receive that frequency and detect any modulation on that signal.
Why is it necessary to modulate the picture and sound signals before transmission?
To avoiding the noise signal effect.Because the modulation is a technic which providing a high characteristic to transmitting the signal on long or short distance.Because the modulated signal received as high bandwidth,high performance of received signal and the modulation Technic is provide a less hight of antenna in wireless transmission which is expressed in the term :(hight of antenna=λ/4).
Why is the frequency spectrum of a discrete signal repetitions of the spectrum of the analog signal?
The analog signal is converted to discrete signal. Even after the conversion, the frequency of the actual signal still remains the same. If the frequency of the discrete signal is different from the analog signal, the reconstructed signal would be different again. This is not what we expect. So base spectrum for similar signals have same frequencies, whether they are discrete or analog. Why do the repetitions occur? The original analog signal is multiplied with a dirac pattern. The base frequency is then shifted to the places, where diracs are available. So long the diracs keep repeating, the base frequency do repeats. Hope you are convinced with my answer
Why direct current is not used for transission of electricity through wires?
Two reasons: 1. Alternating current does not loose as much power over long distance. 2. Alternating current can be stepped up or down through transformers, allowing AC to be transmitted at high voltage (even less current loss) and then it can be stepped back down inside your home. For short distances and if there is no need to step up or down, DC is fine.
What weakens the WiFi signal?
long distances
What happens to the electrical energy when power is transmitted through long distances?
Because wires are not perfect conductors, energy is released as heat. This is why electricity is transmitted at very high voltage and low current to reduce energy loss.
Why is modulation necessary before multiplexing?
modulation means transmitting the signal which is to be transmitted along with the carrier wave, then at the receiver it is separated from the carrier and demodulated. So modulation is needed so as to transmit the signal over long distances with higher accuracy. Hence it is required before multiplexing.
What is the purpose of carrier signal in modulation?
Carrier signal is of high frequencies, it gives strength to the original signal because original signal cannot travel long distances so it needs to be strengthen a bit for transmitting. The carrier signal is a high frequency signal, called an RF. Radio Frequency signal, it is to high for the human or animal ear to detect it, so its outside the audible spectrum and can easily be transmitted over the air to receivers that is tuned to receive that frequency and detect any modulation on that signal.
Do you need shielded XLR cable for long distances?
Yes, their purpose is to prevent any unwanted noise in the signal.
Why DC losses its power when transmitted over long distances?
A: It does not loose its strenght it just becomes less due to the resistances or impedance's along the way.
Why sound waves change into electromagnetic waves in telephone?
Because an electric signal is much easier to transfer over long distances than a sound is.
How do I boost my home wifi signal up to a mile in coverage?
Technically it is possible to transmit a WiFi signal 1 mile because the record for the longest transmitted WiFi signal is 238 miles. In the real world a few hundred feet is much closer to the maximum that you will ever see and even then it is limited by any obstacles that are in the way. Maybe some day our WiFi equipment will get better but until then it will just be geeks with too much time on their hands sending WiFi signals long distances.
What are the three types of distances?
Short distances Medium distances and Long distances
What is the use of video amplifier?
Usually to amplify the video signal across long distances of cable. This is necessary to maintain quality and consistency of the video signal in runs of 100 ft. or more. The word "video" means wideband. A video amplifier is used for any wideband signal.
Why FM signal is more local and cannot be transmitted over long distance?
Since FM signals have shorter wavelength and high frequency, it is diffracted much. Therefore it is not suitable for long distance communiation.
What is the most specific innovation which has an impact in the society?
My opinion or rather answers would be, the TELEPHONE. The telephone has enabled us to communicate over long distances and thus valuable information could be transmitted.
