Korg PS-3300 - Page 20

1-9 SAMPLE AND HOLD (S/H)
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1-9 Sample and Hold (S/H)
Look at graphs “A” and “B" in figure 23.
Graph “A” is one — day's temperature
changes drawn by an automatic recording
thermometer. Graph “B” is a bar graph
that you could draw if you checked the
temperature every three hours.
What the sample and hold circuitry does is
convert graph “A” into graph “B”.
In a synthesizer, graph “A” corresponds to
the kind of continuously changing output
signal produced by a modulation generator.
Graph “B” corresponds to the stepped
output signal produced by the S/H sec-
tion,
As its name implies, the S/H section sam-
ples the input signal at regular intervals and
holds the voltage at that level until the
next sample is taken. The regular intervals
(every three hours in our temperature ex-
ample) are determined by the CLOCK fre
quency knob.
With the setting shown in figure 24, you
can use the S/H to cause pitch variations.
Try using different MG-1 waveforms and
see what happenspto the S/H output
If you turn on the SYNCHRO switch and
use white or pink noise (which is not cy-
clic) as the S/H input signal, both the pitch
variations and the clock frequency will be-
come random.