Teac GigaStudio 4 - Manual (Page 161)

GigaStudio 4 Reference Manual 161
Mic Model Performance
Selecting inverse and emulated mic models function in a “cascade” sense, in that there is no additional
processing required of the GigaPulse NFX plug-in. So if you select a room and a microphone, you will not be
increasing the computation. The GigaPulse will do all the necessary pre-processing of the affected signal in
order to minimize the amount of computation. It is all self-contained within each instance of the plug-in.
For example, use an instrument body resonance placed in a room with a selected replacement mic model, all at
the computational cost of only one GigaPulse plug-in. The computation needed is governed by the size of the
longest impulse, usually the room. Mic model and instrument body resonances tend to be very short in
duration.
Center Mic Group
The Center Mic Group channel is identical in functionality to the other Mic Groups except that only one
channel is available in this group. No Mid-Side decoding is available for the Center Mic Group.
Tail Model
GigaPulse runs in one of two modes: Turbo Mode or Pure Mode. Pure Mode is a 100% mathematically
perfect convolution and is very CPU intensive. Most of the convolution processing is happening in the –80dB
(and down) end of the dynamic range. This results in spending a great deal of computational resources on
portions of source material that, even in a solo context, would be for all practical purposes inaudible.
GigaPulse uses pure convolution for the first 3 seconds of the affected signal. Most common impulse
responses would adequately fit into the 3 seconds available for most musically useful spaces. After 3 seconds,
the Tail Model takes over with a recursive-type algorithm that analyzes the convolved signal and its decay and
matches it tonally continuing with the decay of the signal. Tail model won't gain much in CPU savings for
shorter IRs.
Enable
The default state for Tail Model is on and this is highly recommended.
Overlap
The overlap control is a 0-127 min-max setting. Generally the better results are in the higher numbers. It is a
timing offset and crossfade parameter for the original impulse response convolved with the source material to
the tail model portion of the processed signal.
Level
Adjust this to match the levels of the original signal to the tail model signal.
Cutoff
The Cutoff control is essentially a low pass filter. Adjust this to match the tonal quality of the original signal
to the tail model signal.
Note: Using Tail Model on impulses with an artificial envelope to emulate a decay is not recommended. The
tail model is designed to work well on impulses that are cut off at the end of their sampled duration. Applying
a tail model to an impulse response with an artificial decay envelope will not give satisfactory results.