Chapter 10Nonlinear Processing
M. Holters and L. Köper
10.1 Fundamentals
Linear systems—filters—play an important role in audio signal processing. Linearity here means that the superposition property holds: denote the output of a system excited with input signals 
and 
with 
and 
, respectively. If the system maps the superposition of the input signals 
to the corresponding superposition 
at the output (for any 
), it is considered linear. Systems that do not fulfill this property are accordingly called nonlinear. One important consequence of linearity, when combined with time invariance, is that systems can be fully described in the frequency domain by their transfer function. Therefore, frequency components present in the input signal can be amplified or attenuated and phase‐shifted, but ...
Get Digital Audio Signal Processing, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
