(Impulse optimised filter)
Shortening the filter (lower coefficient) reduces the time range errors,
albeit combined with a slight loss of linearity in the frequency range and
damping performance.
Frequency response and transient characteristics of the short FIR
filter
In this process an ideal Bezier interpolator is combined with what is
known as an IIR filter. This eliminates the problematic pre-echo of
the FIR method. This process produces highly „analogue“ system
characteristics, with a sound quality and measured performance
similar to those of good analogue record players.
Frequency response and transient characteristics of the Bezier
interpolator plus IIR filter
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