Abstract
A major problem when designing infinite impulse response (IIR) filters in the complex domain is ensuring that the filter is stable, especially when the IIR filter approximates the inverse of a non-minimum phase system, as is often the case for equalisation filters. Adding delay to the target frequency response can result in a stable filter, but up to now selecting that delay has been a matter of trial and error. This paper presents an automated method for finding this delay.
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