Filter design

This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (December 2012) (Learn how and when to remove this message)

Filter design is the process of designing a signal processing filter that satisfies a set of requirements, some of which may be conflicting. The purpose is to find a realization of the filter that meets each of the requirements to an acceptable degree.

The filter design process can be described as an optimization problem. Certain parts of the design process can be automated, but an experienced designer may be needed to get a good result.

The design of digital filters is a complex topic.^[1] Although filters are easily understood and calculated, the practical challenges of their design and implementation are significant and are the subject of advanced research.