Eowave Eobody3 - Manual (Page 10)

• digital zoom and offset
digital zoom: max/mid/low/off on 7 offset: -127 to +127
To be compatible with the 7-bit MIDI world...
Those two parameters (digital zoom and offset)
specify how the real range of an analogue input
can be mapped on a 7-bit MIDI value. As a
matter of fact, a sensor does not necessarily
have a range equal to the reference voltage of
the Analogue to Digital Converter. A custom
scaled zoom has been implemented on the
digital value to take advantage of the 12-bit
resolution of the A/D converter. First, the
voltage reference has to be set to the largest
range among the sensors connected to the unit.
Then, the user can select the sensor’s range
within the 12 bits dynamic by specifying a
window size and an offset. The selected range
can then be converted into 7 bits MIDI data
without greatly increasing the quantification
step, as shown in the illustration.
The digital zoom & offset parameters may be
very useful to modulate a filter on a certain part
of the amplitude.
• inverse
127 becomes 0 and 0 becomes 127. This way you may inverse the curse of a sensor. With an
expression pedal, for example, you’ll be able to inverse its curse.
• filter
0-64
32 bits low-pass filter that smoothes the signal - for unstable sensors.
• gate
noise gate:12 values [0-11]
A noise gate threshold reduces the
bit depth of the signal. If the
analogue signal moves inside the
range of the noise gate, no
message will be sent. This field
enables the user to set the width
of the range. A large range will be
very effective against strong noise
but will make the values less
sensitive to a relevant change of
the analogue signal. A threshold of
5 corresponds to 127 different
possible values (i.e.: the analogue
has to change at least of 32 (from
4095 above or under its current
position to be detected as
changing). A threshold of 11
corresponds to 2 bits, useful for
switches or all on/off sensors.
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