This lecture aims at providing the basics of Active noise Control, with a specific highlight on the Electroacoustic Absorbers concept developed in the lab. Applications to real life cases will be adressed.

The outline of the lecture is as follows:

Chapter I: Linear acoustics & Introduction to active noise control
Historical overview of ANC
Sound propagation in 1D
Superposition of sound
Standing waves
Refraction of sound / absorption

Chapter II: Active noise control principles
Principle of active noise control
Feedforward and feedback principles
Control algorithms

Chapter III: Electroacoustic transductions
Transductions and models (actuators, general issues on arrays of actuators, sensors)
Sound sources optimization for active control

Chapter IV: Electroacoustic absorbers
Shunt loudspeakers
Active control of acoustic impedance
Application to low-frequency room modes damping