Question

The quantization noise of a PCM system depends on:
1. Number of quantization levels
2. Step-size
3. Both step-size and number of quantization levels
4. Sampling rate

Answer 1

Correct Answer - Option 1 : Number of quantization levels

Quantization Noise:

It is a type of quantization error, which usually occurs in analog audio signal, while quantizing it to digital.

For example, in music, the signals keep changing continuously, where a regularity is not found in errors. Such errors create a wideband noise called Quantization Noise.

Some salient features of a PCM system are:

• Immunity to transmission noise and interference.
• It is possible to regenerate the coded signal along the transmission path.
• The Quantization Noise depends on the number of quantization levels and not on the number of samples produced per second.
• The quantizing of an analog signal is done by approximating the signal with a number of quantization levels.