Effects and Plug-Ins : VoiCode
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Fine tuning
Left apex, Incidence and Right apex
Incidence The slider operates in the range 0 to 90 degrees within the boundaries of the Left
and Right Apex sliders. (See below.) Incidence is the angle of incidence enclosed
by the major (on) axis of the mic and the bearing line of the sound source. I.e. how
far off-axis the source is. This value is usually zero since, in an ideal world the
source will be on-axis. In some circumstances, e.g. a telephone conversation, the
angle would be around 12 degrees. Or a piano recording with a boundary mic
directly on the lid (value should be approximately the same as the angle of the
lid…).
Left and Right Apex The sliders operate in the range from 5 to 90 degrees. These values represent the
fictitious left and right angles in relation to the direction the mic is pointing in. You
might want to think of them as the major axis angles from the centre line of two
mic capsules used for a classic co-incident pair recording.
Symmetric When ticked, forces Left and Right Apex angles to keep the same values regard-
less of which is adjusted and locks the angle of
Incidence to 0 degrees.
Stereo The slider takes direct control of the generated stereo signal. I.e. it is a width con-
trol. Values close to 0dB will reduce correlation of the output and negative values
will increase correlation to +1 at infinity. (I.e. mono.)
Swap Outputs When ticked the Left and Right outputs are swapped. Since the VoiCode algorithm
generates and artificial
S (side) signal it is not possible to determine its sign which
means that the plug-in chooses arbitrarily which signal is Left and which is Right. If
the generated stereo image appears to be reversed then ticking (or unticking)
Swap outputs will reverse the image.
Other Considerations
The Room size slider also affects the spatial parameters directly. Smaller values will make the signal "dry", and big-
ger values will make the signal "wet". The default choice is an ideal value between "dry" and "wet".
Narrow Apex angles correspond to a less spatial impression than wide Apex angles since the spatial impression is
based on smaller delays.
By choosing the appropriate
Target Correlation or by moving the Stereo slider the sound stage is opened or
closed. These controls also have a major effect on annoying artefacts in the upper frequency range which can be
eliminated by choosing a value towards the
Less echoes end of the scale.
The effects of changing the
Mic directivity setting (which may be unknown) can be heard immediately by the
user. However, please remember to click on
Compute after changing the Mic directivity setting in order to adapt
the other parameters to suit.
Note: A professional stereo signal should have a target correlation between 0.2 and 0.7. It
should not be lowered to an average which is less than 0. If a
slight stereo is introduced with leg-
acy mono recordings or speech then, in order to avoid nasty pseudo stereophonic effects out-
side the sweet spot and to improve the overall sound quality, the target correlation of may of
course exceed 0.7.
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