T+A DAC 8 Betriebsanleitung Seite 42

Oversampling 2 (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
Oversampling 3 (Bezier-interpolator plus IIR-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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