Filter arrangement with a linear phase characteristic, and method to develop such a filter arrangement

摘要

A filter arrangement with a linear phase characteristic is constituted by cascade coupling a first filter (F1) and a second filter (F2). The first filter (F1) is an analogue or digital filter designed so that its amplitude characteristic meets a predefined amplitude specification. The second filter (F2) is implemented as the anti-causal version of a fictive digital all-pass filter (APF) that is designed so that its phase characteristic, up to a linear function of frequency, equals the phase characteristic of the first filter (F1).