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If quadrature amplitude modulation is used to transmit a signal with a baud rate of 8000 what is the corresponding bit rate?
Wiki User
∙ 14y ago
Baud Rate=8000
Each signal change=4 bits (4 bits yield 16 combinations)
Therefore:
(4*8000)=32000bps
Wiki User
∙ 14y ago
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How does amplitude modulation transmit ones to zeros?
Amplitude modulations can be used to transmit binary data. Remember AM modulation is done using a single carrier frequency, and increasing or decreasing the amplitude. A high amplitude would be considered a '1', and a low amplitude would be considered a '0' (typically).
What does fm and am stand for?
AM-Amplitude modulated FM-Frequency modulated Explanation: The frequency and amplitude refer to the width and height of wavelengths in the radio waves that are used to transmit the signal. FM is usually a better signal than AM because the frequency of the waves is less distorted than amplitude.
Why you go for modulation?
modulating signal is the low frequency signal .so we cant transmit for a long distance.so we go for modulating the signal either by modulating the amplitude or frequency or phase of the signal.
How does AM radio differ from FM radio in the sense of waves?
AM stands for Amplitude Modulation while FM stands for Frequency Modulation. AM is simpler and as the name implies the amplitude of the Electromagnetic wave changes to match the sound that you want. FM is rather complicated, it is the frequency that changes slightly in accordance with the sound that you want to transmit. Read the introductory paragraphs of the two related links below this page.
Why we use modulation in laser communicaton?
transmit the information
What is positive and negative modulation?
in order to transmit the video signal amplitude modulation is used. the composite video signal has distinct polarity of black and white levels in the picture.1.positive modulation :- in this type of modulation, increase of brightness toward white causes increase in carrier amplitude peak white has 100% modulation while black and sync level have lower and minimum modulation respectively2.negative modulation :-in this type of modulation,the sync tip level are at 100%.blanking level correspond to black is at 75%and increase in brightness toward white causes decrease in carrier amplitudeNegative modulation is preferred over positive modulation because impulse interference is difficult to deal with and random increase in signal is similar to existing sync pulse.these interference result in generation of black spot and white blobs.
How do amplitude modulation and frequency modulation differ?
Amplitude modulation is where a constant carrier is modulated by the signal, so that the envelope of the carrier represents the signal. Frequency modulation is where a constant carrier is modulated by the signal, so that the frequency of the carrier represents the signal. Phase modulation is where a constant carrier is modulated by the signal, so that the phase angle of the carrier represents the carrier.
Why is FM preferred to am in satellite channels?
FM stands for frequency modulation and AM stands for Amplitude modulation. In FM, frequency of a modulating signal is modulated using carrier frequency i.e. more data can be transmitted using a little space and also it is safe to transmit the information while in AM amplitude of a modulating signal is modulated using carrier frequency i.e. more space needed for transmitting the information. That's why we use FM in place of AM
Where is amplitude modulation used?
we have two types of signals namely the message signal and the carrier signal. so if the amplitude of the carrier is varied in accordance with the instantaneous value of the message signal then it is known as the amplitude modulation.if we want to transmit our message signal to long distances we need to do modulation and hence amplitude modulation is done. by amplitude modulation we generate side bands which consists of the part of the message which signal which is demodulated at the receiver to get back the original message signal we are using this amplitude modulation in radio communication. It will work in the traffic also with out disturbances but frequency modulation didn't work without disturbances.
Why is modulation necessary in radiobroadcasting?
Modulation in radio broadcasting is important because it is necessary to adjust the carrier signal so that the information in the modulating signal can be broadcasted. You must have modulation in order to transmit thru a radio wave.
How do electromagnetic waves carry information?
The thing about electromagnetic waves that makes them useful for communication is that we know how to generate them and how to detect them. As soon as you have that ability, you're ready to move information from one place to another. After that, the only question is: How do you put the information onto the waves ? The answer is: Change something on the waves, according to a pattern that the sender and the receiver agree on. What is there about a wave that you can change ? Not much ... only the wave's amplitude and its frequency (wavelength), and that's it! Can you do anything with those ? Example: The easiest way to change the amplitude of the wave is to turn it on and off. You can use a flashlight or a radio transmitter, turn it on and off in some pattern that you've worked out. If you use both long and short flashes, you can call it "Morse Code". If all the flashes are the same length but they come at different times, you can call it "digital communication". As long as somebody else can see your flashlight or receive your radio signal, you can send them messages if they understand your patterns. After that, the sky is the limit. You can get fancy, change the amplitude by small amounts, change the frequency by large or small amounts, change them fast or slow, change them both at the same time, and work out ways to load tremendous amounts of information onto an electromagnetic wave. Once you accomplish that, you earn the right to use big fancy names for your methods, like 'Amplitude Modulation', 'Frequency Modulation', 'Phase Modulation', and a few of my favorites: 'Seven-level Partial Response Modulation', 'Quadrature Phase Shift Keying', and '256-state Quadrature Amplitude Modulation'. But all of them are just different systems for changing the amplitude and frequency of a wave in definite patterns, and it's the patterns that carry the information.
What Technique is used 2 transmit audio signals of television?
what is the modulation used in telivision for audio signals
