Question

Choosing a discrete value that is near but not exactly at the analog signal level leads to

• A. PCM error
• B. Quantization error
• C. PAM error
• D. Sampling error

Hint:

Analog-to-Digital Conversion Errors. Sampling errors (e.g., aliasing) arise from the sampling rate. Quantization error arises from representing continuous analog values with discrete digital levels.

Answer 1

The Correct Option is B

Converting an analog signal to a digital representation involves sampling and quantization
- Sampling: Measuring the analog signal's value at discrete points in time
Errors related to sampling rate are called aliasing or sampling error
- Quantization: Representing the continuous range of sampled analog values using a finite set of discrete digital levels
Since the discrete level chosen is usually the closest available level to the actual analog sample value, there is almost always a small difference between the actual analog value and the discrete value used to represent it
This difference is called quantization error or quantization noise
PCM (Pulse Code Modulation) is a digital representation method involving sampling and quantization
PAM (Pulse Amplitude Modulation) is an analog modulation technique
The error specifically arising from approximating an analog value with a discrete level is quantization error