What are some clear and aesthetic ways to display information about speech signals?

1. What is speech signal?
2. What is the nature of speech signal?

What is speech signal?

Speech signals are sound signals, defined as pressure variations travelling through the air. These variations in pressure can be described as waves and correspondingly they are often called sound waves. In the current context, we are primarily interested in analysis and processing of such waveforms in digital systems.

What is the nature of speech signal?

Speech signals are nonstationary in nature, means their statistical parameters like intensity and variance vary over time [11].