PULSE MODULATION - DIFFERENTIAL PCM

What is the main purpose of pulse modulation?

• a. To compress signals
• b. To encrypt signals
• c. To transmit signals over long distances
• d. To filter signals

What is differential pulse code modulation?

• a. A type of pulse modulation
• b. A type of digital modulation
• c. A type of analog modulation
• d. A type of frequency modulation

What is the difference between PCM and DPCM?

• a. DPCM does not quantize the signal
• b. PCM does not quantize the signal
• c. DPCM uses a predictive quantization scheme
• d. PCM uses a predictive quantization scheme

What is the purpose of differential encoding in DPCM?

• a. To reduce the number of bits in the signal
• b. To increase the signal-to-noise ratio
• c. To reduce the quantization error in the signal
• d. To reduce the bandwidth of the signal

How does DPCM achieve higher compression compared to PCM?

• a. By quantizing the signal with a higher resolution
• b. By encoding the difference between adjacent samples
• c. By increasing the sampling rate of the signal
• d. By decreasing the sampling rate of the signal

What is the effect of increasing the step size in DPCM quantization?

• a. Higher signal fidelity
• b. Lower signal fidelity
• c. Higher compression rate
• d. Lower compression rate

If a signal has a maximum amplitude of 2V and a quantization step size of 0.5V, what is the maximum number of quantization levels?

• a. 4
• b. 8
• c. 16
• d. 32

Discuss the effect of increasing the predictor order in DPCM on the compression rate and signal fidelity.

• a. Increasing the predictor order increases the compression rate but decreases the signal fidelity
• b. Increasing the predictor order increases the signal fidelity but decreases the compression rate
• c. Increasing the predictor order has no effect on the compression rate or signal fidelity
• d. Increasing the predictor order increases both the compression rate and signal fidelity

Given a signal with a sampling rate of 10 kHz and a maximum frequency component of 4 kHz, what is the minimum bit rate required for DPCM with a quantization step size of 0.1?

• a. 20 kbps
• b. 40 kbps
• c. 80 kbps
• d. 160 kbps

Evaluate the effectiveness of DPCM as a compression technique for speech signals.

• a. DPCM is highly effective in compressing speech signals without loss of intelligibility
• b. DPCM is moderately effective in compressing speech signals with some loss of intelligibility
• c. DPCM is minimally effective in compressing speech signals with significant loss of intelligibility
• d. DPCM is not suitable for compressing speech signals