Doepfer A-100(~ 40 MB) - Manual (Page 163)

doepfer System A - 100 VCO 2 A-111
9
If it’s the other way round, and the slave is at a higher
frequency than the master (f
M
< f
S
) then it still follows
the master’s frequency (Fig. 13 b: the slave’s cycle T
R
matches the master VCO’s cycle), but the waveform is
also actually altered by the changes in direction the
master imposes on it. Harmonic sidebands are crea-
ted, which can produce interesting timbral changes.
The way Hard Sync is implemented on the A-111
differs from the system on the A-110 standard VCO,
which imposes a change of direction on the slave only
at every other edge of the master waveform. Because
the A-111 master sends a change to the slave at its
positive as well as negative edges, when the slave
frequency is higher than the master (f
M
< f
S
) the
process produces richer side bands, and more inter-
esting timbres.
Fig. 13: Hard sync on the A-111
f > f
M
T
R
T
M
T
M
T
R
T
S
0V
0V
0V
0V
0V
Slave-Signal
Master-Signal
a: Hard-Sync-Signal
S
f < f
M
Master-Signal
b: Hard-Sync-Signal
S