PCM vs DM Systems

What does PCM stand for in signal processing?

• Pulse Code Measurement

• Phase Control Modulation

• Pulse Carrier Modulation

• Pulse Code Modulation

Describe the basic principle of a PCM system.

• A PCM system directly transmits analog signals without any conversion.

• The basic principle of a PCM system is to filter out noise from digital signals.

• The basic principle of a PCM system is to convert an analog signal into a digital signal through sampling, quantization, and encoding.

• A PCM system amplifies analog signals for better transmission.

What is the main function of a DM system?

• To automate decision-making processes.

• To manage network security protocols.

• To store large amounts of data.

• To enhance user interface design.

Explain the concept of quantization in PCM.

• Quantization in PCM is the method of filtering out noise from digital signals.

• Quantization in PCM involves converting digital signals back into continuous analog signals.

• Quantization in PCM is the process of converting continuous analog signals into discrete digital values by sampling and rounding to predefined levels.

• Quantization in PCM is the process of amplifying analog signals to improve clarity.

How does quantization in DM differ from PCM?

• Quantization in DM encodes differences with one bit, while PCM encodes absolute values with multiple bits.

• Quantization in DM uses multiple bits for encoding differences, while PCM uses one bit for absolute values.

• Quantization in DM and PCM both encode absolute values using the same number of bits.

• DM quantization is a form of lossy compression, whereas PCM is lossless.

List one advantage of using PCM over DM.

• Better noise immunity.

• Simpler implementation

• Lower data rate

• Higher bandwidth usage

What is one key advantage of DM systems?

• Decentralized data storage and increased data redundancy.

• Limited access to data and slower retrieval times.

• Higher costs associated with data management and maintenance.

• Centralized data management and improved data consistency.

How is the Signal-to-Noise Ratio (SNR) defined in PCM?

• SNR in PCM is the difference between the maximum and minimum signal levels.

• SNR in PCM is defined as the total power of the signal only.

• SNR in PCM is the ratio of noise power to signal power.

• SNR in PCM is the ratio of signal power to noise power, expressed in decibels.

What factors affect the SNR in a DM system?

• Receiver sensitivity

• Transmission distance

• Factors affecting SNR in a DM system include signal power, noise power, bandwidth, modulation scheme, and interference.

• Channel coding technique

In PCM, what happens to the signal during the quantization process?

• The signal is converted into an analog waveform.

• The signal is amplified to a higher frequency.

• The signal is filtered to remove noise.

• The continuous signal is approximated to discrete levels.