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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.
What happens when electricity is transmitted over long distances?
When electricity is transmitted over long distances, it can experience energy losses in the form of heat due to resistance in the transmission lines. This can lead to a decrease in voltage levels, which may require additional equipment such as transformers to boost the voltage back up along the way. Additionally, environmental factors like temperature and weather conditions can also affect the efficiency of electricity transmission over long distances.
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.
How does a signal move through a neuron?
A signal moves through a neuron by traveling along the axon, which is a long, thin extension of the neuron. The signal is transmitted as an electrical impulse called an action potential. When the signal reaches the end of the axon, it triggers the release of neurotransmitters, which then carry the signal to the next neuron.
How far can a radio signal travel and what factors influence its range?
A radio signal can travel long distances, potentially thousands of miles. The range of a radio signal is influenced by factors such as frequency, power of the transmitter, antenna height, atmospheric conditions, and obstacles in the signal path.
Why is a carrier wave neede to transmit the human voice?
A carrier wave is needed to transmit the human voice because it provides a medium for transporting the voice signal. By modulating the voice signal onto the carrier wave, the voice signal can be efficiently transmitted over long distances through the air or through cables. The carrier wave acts as a stable platform on which the voice signal can be superimposed without being distorted.
What type of waves can be transmitted in a vacuum?
Electromagnetic waves, such as light waves and radio waves, can be transmitted in a vacuum because they do not require a medium to travel through. These waves propagate through the vacuum of space and can travel long distances without the need for a medium.
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.
