Over the last three decades, the search for competitiveness and growth gains has driven the evolution of machine maintenance policies, and the industry has moved from passive maintenance to active maintenance with the aim of improving productivity. Active maintenance requires continuous monitoring of industrial systems in order to increase reliability, availability rates and guarantee the safety of people and property.

• Introduction
• Chapter 1: Parametric signal processing approach
• Chapter 2: The signal demodulation techniques
• Chapter 3: Kullback-Leibler divergence for incipient fault diagnosis
• Chapter 4: Higher-order spectra
• Chapter 5: Fault detection and diagnosis based on principal component analysis
• Conclusions