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SAMPLE/HOLD CIRCUIT
?AC output waveform is a stepped waveform and contains a thin noise called "glitch" in each step.
Sample/Hold circuit eliminates lhe glitch noise.
BSHH
trom DSP
/ '
'i
Enlarged
VADl
(+3V)
DSP outputs a sampling signal BSHH in each step of the DAC2
output.
while signal BSHH is High revel, the switch s lurns on causing
the signal to pass through. At the same time, voltage of the
signal is charged in the capacitor C,
At the end of one step where the gtirch appears, signal BSHH
falls to Low level. The switch s turns otf shutting td glitch out.
ryryF swilch turns otf , capacitor c discharges so tnat tne output
of-lhe switch keeps the same voltage tevet.
Thus, the glitch noise is eliminated from the DAC2 output.
FILTER,, POWER ON MUTE, MTXER CIRCUITS
The stepped waveform is smoothed by,the Filter.
At Power ON, cPU ri99s the signal MUTE turning FET T7 off. The power on reverb
noise is etiminated.
Delayed,sound:sighal
from DAC2 is then mixed iitn tf,e VCF outpui by Mixer.
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Mute fbm CPU
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From Sample/Hold
Circuit
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Fifter
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Delayed sound
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