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Why is amplitude modulation susceptible to noise but not frequency modulation?
Wiki User
∙ 11y ago
because noise usually changes the amplitude not frequency.
Wiki User
∙ 11y ago
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Why frequency modulation is superior to amplitude modulation?
FM provides noise immunity, whereas AM is easily affected by noise. With FM, the amplitude of the sound is converted into a shift in frequency. So the volume is limited by the bandwidth, but the frequency of the sound can vary as much as it likes, giving a higher fidelity sound. Spikes induced on the signal usually affect the amplitude of the signal. The amplitude of an FM signal is not used in the demodulation process and is therefore immune to spikes in the signal. AM was first used in radio because it is very easy to achieve using basic components. A single rectifier only, is needed to recover the audio. FM is quite a complicated process and could only be achieved once electronics had progressed.
What is amplitude modulation and frequency modulation and difference between them?
Both angle and amplitude modulation are involved in radio wavelength patterns. Angle modulation is where the modulating wave manipulates the angle of a sine-wave carrier. The two types of angle modulation include frequency and phase modulation. On the other hand, Amplitude modulation is the strength behind carrying the waveform in radio.
Which modulation can reduce the noice of signal?
Signals of different frequencies cannot interfere with each other. For example can audio waves (speech) interfere with AM or FM signals?? So when we perform modulation we just transfer the message to another amplitude/frequency/phase. Hence they will never interfere with signals which are not in the same range as them. Regards Arvind
Why is a limiter used in FM?
limiter mainly used to limit the amplitude of FM waveform.because of, in FM the frequency only varied but amplitude also varied due to noise . to cancel the amplitude variation limiter mainly used
Why is FM superior immunity to noise?
FM systems are far better at rejecting noise than AM systems. Noise generally is spread uniformly across the spectrum (the so-called white noise, meaning wide spectrum). The amplitude of the noise varies randomly at these frequencies. The change in amplitude can actually modulate the signal and be picked up in the AM system. As a result, AM systems are very sensitive to random noise. An example might be ignition system noise in your car. Special filters need to be installed to keep the interference out of your car radio. FM systems are inherently immune to random noise. In order for the noise to interfere, it would have to modulate the frequency somehow. But the noise is distributed uniformly in frequency and varies mostly in amplitude. As a result, there is virtually no interference picked up in the FM receiver. FM is sometimes called "static free, " referring to its superior immunity to random noise.
What are the advantages frequency modulation amplitude modulation?
Frequency modulation have some advantages over amplitude modulation, FM is not sensitive to the amplitude noise, and have high efficient use of transmitted power
Why FM is used for sound transmission whereas am is used for picture transmission?
FM is used for both. Phase modulation can be used as well. FM radio is generally clearer than AM because the information in AM is stored in the amplitude of the wave. As waves propogate, they collect noise, which distorts their amplitude. This generally does not happen to the frequency. FM, or frequency modulation stores the information in the frequency. Both are subjected to the same amplitude modulating noise, but since the information is encoded in a different way, it is not degraded.
Why FM is more clearer than am?
The abbreviations FM and AM stands for amplitude modulation and frequency modulation. The reason why FM is more clearer than AM is because FM has a better signal-to-noise ratio than AM does.
Why does the FM radio wave remain unaffected by such a plasma?
Just about all radio noise is amplitude modulated. FM radios use Frequency Modulation and is unaffected.
Why is that amplitude modulation is mostly affected by man made interference than frequency modulation?
since man made devices always produce noise for other electronic devices and noise always add at the amplitudes of any wave.in the am,amplitude is varying w.r.t. the information or modulating signal so it is most prone to noise and hence affected most by man made devices
Which modulation technique is most prone to noise PWM or AM?
AM = Amplitude Modulation and is more prone to noise because the signal amplitude caries the intellegence, Noise changes this easily. PWM is Pulse Width Modulation and noise does not change the width of the pulses, though it may introduce other pulses. Therefore the original intellegence is still recoverable.
How do I begin to learn about business opportunities in the classifieds?
Comparing this figure of merit with the corresponding result described in Equation (2.1521 for an FM system, we see that the use of frequency modulation offers the possibility of improved noise performance over amplitude modulation when
Why Fm is more immune to noise than AM?
b/c information lies in frequency... while in AM information lies in amplitude and noise effects the amplitude more as compare to frequency....... there for.....
Why frequency modulation is superior to amplitude modulation?
FM provides noise immunity, whereas AM is easily affected by noise. With FM, the amplitude of the sound is converted into a shift in frequency. So the volume is limited by the bandwidth, but the frequency of the sound can vary as much as it likes, giving a higher fidelity sound. Spikes induced on the signal usually affect the amplitude of the signal. The amplitude of an FM signal is not used in the demodulation process and is therefore immune to spikes in the signal. AM was first used in radio because it is very easy to achieve using basic components. A single rectifier only, is needed to recover the audio. FM is quite a complicated process and could only be achieved once electronics had progressed.
Why frequency modulation is preffered over AM?
-- FM is better for the person on the transmitting end, because it's easier and cheaper to generate with high quality. Modulation can be applied in an early stage of the transmitter, at low frequency, low power, and with a small modulation index, and the final signal for transmission can be derived by frequency multiplication and power amplification, without garfing up (corrupting) the signal and producing a lot of intermod. AM must be modulated at the final frequency and power, which requires half as much audio power as final carrier output power, which is expensive. -- FM is better for the person on the receiving end, because most of the radio noise in nature, as well as man-made radio noise, is amplitude noise. If your receiver doesn't care about changes in amplitude, it's immune to a lot of the noise that gets picked up on the way from the transmitter to the receiver.
What is Amplitude shift keying ASK?
Amplitude Shift Keying (ASK) is a digital modulation technique where the amplitude of the carrier signal is varied in response to the digital input data. A high amplitude represents a binary 1, while a low amplitude represents a binary 0. ASK is susceptible to noise and interference but is simple to implement and can achieve high data transmission rates.
What are the advantages and disadvantages of the 8 qam?
Although QAM appears to increase the efficiency of transmission by utilizing both amplitude and phase variations, it has a number of drawbacks. The first is that it is more susceptible to noise because the states are closer together so that a lower level of noise is needed to move the signal to a different decision point. Receivers for use with phase or frequency modulation are both able to use limiting amplifiers that are able to remove any amplitude noise and thereby improve the noise reliance. This is not the case with QAM. The second limitation is also associated with the amplitude component of the signal. When a phase or frequency modulated signal is amplified in a transmitter, there is no need to use linear amplifiers, whereas when using QAM that contains an amplitude component, linearity must be maintained. Unfortunately linear amplifiers are less efficient and consume more power, and this makes them less attractive for mobile applications.
