User Manual

31 User Manual v 1.0.0
UNFILTER
NOISE
SAVE/LOAD
When on, the LEARN function evaluates only stochastic/noisy
signal components to determine the transfer function. Use
this when working with signals that consist mainly of
harmonic content or when using very short LEARN DCY
times.
These buttons open a browser window that allows saving the
current transfer function estimate as impulse response file
(IR), or importing an IR as transfer function. On SAVE you
can choose between linear and minimum phase modes.
Linear phase mode gives you the option to select “Zero Phase
Ordering” (ZPO), which will result in the IR starting with the
peak level instead of at zero. Use ZPO when you plan using
the resulting IR within an application that explicitly supports
this, and leave this option off for use in regular convolution
processors. The minimum phase mode allows you to set the
filter order in the range 10-1000. Try both extremes to get a
feel for how this influences results. The IR output format is
WAV/24 bit, and the sample rate is taken from the current
session.
On LOAD the IR’s transfer function is inverted, and the data
is converted to match the session sample rate. The IR will be
truncated to UNFILTER’s internal length, so importing a
reverb IR will not allow adding or removing reverb!
Supported file formats are WAV, AIF(F), 16 or 24 bit.