Section 4 - Algorithms
PITCH SHIFTER, PITCH SHIFT 2U
The Pitch Shifters allow
you
to
change
the pitch of a signal
to
any
pitch
desired
within
a
range
of
one octave
in
either direction. The
DP
/ 4 offers four different
pitch
shift algorithms, each
designed
with
a different
purpose
. There are three different 1
Unit
Pitch Shifters,
and
one
2
Unit
Pitch shifter:
00
-
Pitch
Shifter
offers a 1
unit
splicer type pitch shifter.
00
-
Pitch
Shift
2U
is
a splicer
type
incorporating
zero
crossing detection.
00
-
PitchShift-DDL
combines a
pitch
shifter
with
a DDL (described later).
00
-
FastPitchShift
is a 1
unit
pitch
shifter designed for
pitch
correction.
Try the different
pitch
shifters
until
you
find the
one
that
works
best
with
your
sound
source,
and
for
your
application. These first
two
algorithms listed are "splicer
types"
of pitch shifters,
which
means
that
they
drop
or
add
small sections of the original signal to the effect. Pitch Shift 2U
has
incorporated
one
ESP
chip
for
zero
crossing (pitch) detection for splice synchronization,
having
an
optimal detection
range
of
55 to 555Hz. Pitch Shift (IU) uses only
one
ESP chip,
but
does
not
incorporate
zero
crossing detection. This pitch shifter is
best
used
for a
doubling
effect. Splicer
type
pitch
shifters
are
popular
because for low pitch shift ratios, splicing is infrequent. These pitch
shifters
can
create
very
interesting stereo fields
by
panning
each
of
two
pitch shifted voices
selectively,
and
because
of the
inherent
time delay
modulation
of
the algorithm. All
pitch
shifters
except
PitchShift-DDL
take
the left
channel
input
as Voice 1,
and
the
right channel
input
as voice 2.
Pitch Shifter, Pitch Shift 2U, FastPitchShift Signal Routing
108
Pan
Vc
1 Pitch Shifter
II-o-Hl~"
Main
Outputs
Vc 2 Pitch Shifter
Main
t--'l+)-~
Outputs
The
parameters
available for these algorithms are:
01-
Mix
02-Volume
See the descriptions
under
the
Mix
and
Volume Parameters,
in
the
beginning
of this section.
These algorithms
sound
best
with
a Mix of
wet
and
dry. Try
using
a
modulation
controller for
the Mix
parameter
to
bring
in
or
fade
out
the pitch shifted signal.
03
- PitchShifter Vc 1 Semi Range: -
12
to +12
This
parameter
allows
you
to adjust
the
pitch
of Voice 1
up
to
an
octave above
or
below the
original
pitch
in
semi-tones (half steps).
04 - PitchShifter Vc 1 Fine Range: -99 to +99
This
parameter
allows
you
to fine
tune
the pitch of Voice
1.
05
- PitchShifter Vc 1 Level Range:
00
to
99
This
parameter
allows
you
to adjust the
volume
of Voice 1. A
setting
of
00
would
eliminate
any
audible
pitch
shift.
ENSONIQ DP/4 Musician's Manual
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