Virtual Labs

Pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM), Pulse Position Modulation(PPM), Pulse Coded Modulation & their Demodulation

In Pulse Amplitude Modulation (PAM), what is the effect of increasing the bandwidth of the transmitted signal?

a: Increased noise immunity Explanation

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b: Increased inter-symbol interference Explanation

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c: Reduced pulse amplitude Explanation

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d: Improved time resolution Explanation

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Which of the following is a primary disadvantage of using Pulse Width Modulation (PWM) in high-frequency applications?

a: Increased power consumption Explanation

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b: Increased sensitivity to noise Explanation

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c: Decreased frequency stability Explanation

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d: Complex demodulation process Explanation

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How does quantization noise in Pulse Code Modulation (PCM) affect the signal-to-noise ratio (SNR)?

a: It improves the SNR. Explanation

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b: It degrades the SNR. Explanation

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c: It has no effect on the SNR. Explanation

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d: It improves the SNR at lower quantization levels. Explanation

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In a Pulse Position Modulation (PPM) system, how does the introduction of timing jitter impact the accuracy of the demodulated signal?

a: It has no impact on the signal. Explanation

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b: It increases the signal amplitude. Explanation

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c: It causes errors in pulse position detection. Explanation

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d: It increases the signal bandwidth. Explanation

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Which factor limits the maximum number of quantization levels in Pulse Code Modulation (PCM) without significantly increasing the quantization noise?

a: Sampling frequency Explanation

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b: Bit rate Explanation

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c: Signal bandwidth Explanation

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d: Amplitude resolution Explanation

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In PAM, what is the consequence of using non-linear devices during the modulation process?

a: Distortion is introduced, affecting the integrity of the signal. Explanation

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b: The signal is compressed, reducing bandwidth. Explanation

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c: The pulse amplitude is stabilized. Explanation

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d: The modulating signal is unaffected. Explanation

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Why is Pulse Width Modulation (PWM) preferred in power delivery systems over PAM?

a: PWM signals are more energy-efficient for power delivery. Explanation

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b: PWM signals are easier to demodulate. Explanation

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c: PWM allows for higher data rates. Explanation

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d: PWM signals are less susceptible to distortion. Explanation

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In a noisy environment, which type of pulse modulation is most likely to suffer from inter-symbol interference (ISI)?

a: PAM Explanation

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b: PWM Explanation

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c: PPM Explanation

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d: PCM Explanation

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How does the choice of sampling frequency affect the performance of a PCM system?

a: Higher sampling frequency reduces quantization noise. Explanation

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b: Lower sampling frequency increases aliasing distortion. Explanation

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c: Higher sampling frequency reduces the required bit rate. Explanation

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d: Lower sampling frequency increases resolution. Explanation

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In PPM, why might a higher-order modulation scheme be preferred in high-bandwidth communication systems?

a: It increases the amplitude resolution of the pulses. Explanation

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b: It allows for more data to be transmitted within the same bandwidth. Explanation

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c: It reduces the power consumption of the system. Explanation

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d: It decreases the system's susceptibility to noise. Explanation

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