Calibration
Synthesizers and Samplers
DEEPMIND 6
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The DeepMind 6 has 6 voices. Each voice has its own LFO, OSC, VCF, ENV and VCA stages.
The CALIBRATION routine is used for Voice checking, OSC wave shapes, VCF self-oscillation, Pulse Width modulation
and the VCA bias.
VCF - Unlike many other synthesizers, the DeepMind 6 is capable of accurate pitch tracking even when the lter
resonance is pushed to (and past) the point where the lter starts to self-oscillate. When using this self-oscillating
feature of the VCF as a sound source, the VCF calibration ensures the correct response when playing the entire scale of
the keyboard.
The DeepMind 6 VCFs are calibrated at the factory during production. However, because its lters are voltage
controlled and can be aected by extremes of temperature, you may need to use the built-in calibration function to
ne tune them occasionally. Calibration may also be required after a rmware upgrade or when requested to do so by
an authorized Behringer support technician.
OSC - The DeepMind 6 OSCs are calibrated at the factory during production. The oscillators are discrete analog circuits,
but they are digitally controlled. Compared to a Voltage Controlled oscillator (VCO), the OSC has far superior stability,
especially when they have very high frequency, low-jitter master clock sources, as used in the DeepMind 6. This stage
calibrates the slope of the sawtooth waveform to ensure even volume and pulse-width across the full range of the
synthesizer.
This means that the OSCs should never need re-calibrating except after a rmware upgrade, or when requested to do
so by an authorized Behringer support technician.
Overview of the calibration routines:
ALL - This will initiate all of the routines.
VOICE CHECK - This performs a series of functionality tests on each voice.
VCF - This routine puts the voice into self oscillation and tunes to 1 kHz in order to calibrate the resonance of the VCF
for that voice. The routine then puts the voice into self oscillation and checks the tuning at 50 Hz, 220 Hz, 880 Hz and
10 kHz to ensure the VCF is performing as expected. The test is repeated for all voices.
VCF FINE - This routine tests the scale and oset for all voices.
OSC - This routine adjusts the slope of the sawtooth at octave intervals. This ensures the precision of the slope so that it
performs as designed. The test is repeated for all voices.
PW - This routine adjusts the pulse width (mark to space ratio) of the pulsewave. This ensures the precision of the ratio
so that it performs as designed. The test is repeated for all voices.
VCA - The Voltage Controlled Amplier (VCA) uses a bias voltage to set its operating level.
This bias voltage is balanced so that the VCA responds as designed. The test is repeated for all voices.
Calibration Voices