The Question is from neet-physics communication-system , and it was created by the author VENKATESWARARAO

Question

Which type of modulation is most susceptible to noise?

VENKATESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Susceptibility of modulation techniques to noise.
 **Related Topics**: Amplitude modulation (AM), Frequency modulation (FM), Phase modulation (PM), Pulse code modulation (PCM), Signal-to-noise ratio (SNR).
 **Prerequisites**: Understanding of basic modulation techniques and their characteristics.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify the modulation technique most vulnerable to noise.
  No specific noise type is mentioned, implying we consider general additive noise.
**Method & Steps**:
 1. Analyze the impact of additive noise on each modulation type.
  Reasoning: Noise added to a signal affects the amplitude, frequency, and phase.  We need to assess how each modulation scheme handles these disturbances.
  Formula/Rule:  While no specific formulas directly compare noise susceptibility, the SNR is a key metric.  Higher SNR indicates better noise immunity.
 2. Compare the relative noise immunity of AM, FM, PM, and PCM.
  Working: AM is directly affected by amplitude noise, making it highly susceptible. FM and PM are less affected by amplitude noise as the information is encoded in frequency and phase shifts respectively. PCM, being a digital technique, is relatively robust against noise up to a certain threshold (quantization noise is present but less significant than the noise impact on analog techniques).
  Key Point:  The impact of noise depends on the noise power relative to the signal power, which is represented by the SNR.
 3. Determine the most susceptible modulation technique.
  Result: Amplitude Modulation (AM) is the most susceptible to noise.
  Verification:  The fundamental principle of AM is to vary the amplitude of a carrier wave with the message signal.  Noise directly adds to the amplitude, severely impacting the message recovery.
 ## OPTION ANALYSIS
A ✓: Amplitude Modulation (AM) is susceptible to noise because the message signal is encoded in the amplitude of the carrier wave.  Additive noise directly affects the amplitude, causing distortion and loss of information.  It has the lowest SNR among the given options.
B :x: Frequency Modulation (FM) is more robust to noise than AM because changes in amplitude due to noise have less impact on the frequency information.  It generally provides a higher SNR than AM.
C :x: Phase Modulation (PM) is similar to FM in its noise immunity. Changes in amplitude have less impact on the phase information.
D :x: Pulse Code Modulation (PCM) is a digital modulation technique that is relatively immune to noise due to its quantization and error-correction capabilities.  It can achieve higher SNRs than AM, FM, or PM under many circumstances.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing FM and PM with AM in terms of noise susceptibility:  Remembering that AM's susceptibility stems from directly encoding the message in the amplitude is crucial.
  2.Overlooking the digital nature of PCM:  PCM's inherent robustness against additive noise is a key differentiator.
 **Quick Tips**:
  1.Think of how the message is encoded.  Amplitude is the most vulnerable.
  2.Remember that digital techniques (like PCM) generally have better noise immunity than analog techniques (like AM, FM, and PM).

VENKATESWARARAO · Answer

The correct Option is "Amplitude Modulation"

VENKATESWARARAO · Answer

Frequency Modulation

VENKATESWARARAO · Answer

Phase Modulation

VENKATESWARARAO · Answer

Pulse Code Modulation

NEET Physics Communication System MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company