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Which of the following is NOT an advantage of pulse code modulation?

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  1. No precise clock is necessary for precise reproduction as samples are not reliant on time.
  2. It is immune to channel induced noise and distortion
  3. Repeaters can be employed along a transmission channel.
  4. Encoders allow secured data transmission.

Answer (Detailed Solution Below)

Option 1 : No precise clock is necessary for precise reproduction as samples are not reliant on time.
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Detailed Solution

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Concept:

Pulse code modulation is a technique to change an analog signal to digital data. A large bandwidth is required in PCM system.

Explanation:

A PCM encode contain three components:

1) The analog signal is sampled

2) The sampled signal is quantized

3) The quantized values are encoded as stream of bits

As samples are dependent on time, an accurate clock is required for accurate reproduction. If either the encoding or decoding clock is not stable, these imperfections will directly affect the output quality

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More Pulse Code Modulation (PCM) System Questions

Q1.The number of quantization levels is increased from 4 to 64. The bandwidth required for the transmission of a PCM signal increases by a factor of 
Q2.An audio signal s(t) = 5cos (2000πt) is quantized using 10-bit PCM. What is the signal-to-quantization noise ratio?
Q3.In a PCM system, each quantization level is encoded into 6 bits. The signal to quantization noise ratio is -
Q4.Five channels each with 100 kHz bandwidth are to be multiplexed together. What is the minimum bandwidth of the link, if there is a need for a guard band of 10 kHz between the channels to prevent interference?
Q5.Noise is measured in _______.
Q6.Which one of the following noises arises in electronic devices such as diodes and transistors because of the discrete nature of current flow?
Q7.Which of the following statements are correct to improve the noise figure of a receiver? 1. The devices used for the amplifiers and mixer stages must produce low noise 2. The receiver can be operated at low temperatures. 3. High-gain amplifiers are used to improve the noise figure. 4. The diodes and FETs are preferred to improve the noise figure. Select the correct answer using the code given below.
Q8.A PCM system uses a uniform quantizer followed by a 7-bit binary encoder. The bit rate of the system is equal to 50 × 106 bits/sec. What is the maximum message signal bandwidth for which the system operates satisfactorily? 
Q9.Which of the following is NOT an advantage of pulse code modulation?
Q10._______ step is NOT involved in pulse code modulation system.

More Pulse Modulation Questions

Q1.To simulate a analog signal of frequency f, bandwidth requirement of channel is : 
Q2.PAM signals can be demodulated by using a-
Q3.The number of quantization levels is increased from 4 to 64. The bandwidth required for the transmission of a PCM signal increases by a factor of 
Q4.An audio signal comprising of a single sinusoidal term s(t) = 3cos (2π1000t) is quantized using DM. What is the signal-to-quantization noise ratio?
Q5.An audio signal s(t) = 5cos (2000πt) is quantized using 10-bit PCM. What is the signal-to-quantization noise ratio?
Q6.A voice signal band limited to 3.4 kHz is sampled at 8 kHz and pulse code modulated using 64 quantization levels. Ten such signals are time division multiplexed using on 5-bit synchronising word. The minimum channel band width will be
Q7.In Delta Modulation, the slope overload distortion can be minimized by
Q8.In digital modulation schemes, raised cosine filter is used to reduce __________ caused by _________.
Q9.In a PCM system, each quantization level is encoded into 6 bits. The signal to quantization noise ratio is -
Q10.The demodulation of a delta modulated signal is achieved by -
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