reduced
20
dB
or
more
from
response
to
sounds
coming
from
other
directions.
The
C720
allows
all
the
traditional
patterns
to
be
selected,
but
its
real
advantage
is
in
allowing
fine
adjustments
to
be
made
to
the
pattern
to
suit
the
sound
and
the
environment.
The
basic
pickup
patterns
of
the
two
halves
of
the
C720
are
“cardioid.”
Sensitivity
to
sound
arriving
from
the
sides,
is
reduced
by
6
dB
(half)
compared
with
sensitivity
toward
the
front.
Toward
the
rear,
sensitivity
is
reduced
by
20
to
25
dB.
The
polar
graph
above
shows
this
response.
Toward
the
top
of
the
page
represents
the
direction
in
front
of
the
microphone.
Each
half
of
the
C720
has
this
directional
pattern;
one
is
facing
forward
and
the
other
faces
to
the
rear.
If
you
mix
the
front
and
rear
signals
equally,
the
result
is
an
omnidirectional
pattern
–
sounds
are
picked
up
evenly
from
all
directions.
If
you
mix
the
front
and
rear
signals
in
different
ratios,
the
result
is
an
omnidirectional
type
pattern
but
not
perfectly
even.
Mixing
the
rear
signal
at
‐
6
dB
versus
the
front
signal
yields
this
sort
of
pattern:
Using
less
of
the
rear
signal
makes
a
“wide
cardioid,”
“subcardioid”
or
“hypocardioid”
where
the
rear
response
might
be
‐
10
or
‐
12
dB
from
the
front
response.
Inverting
the
phase
of
the
rear
capsule
signal
produces
the
family
of
patterns
related
to
figure
‐
8
or
bidirectional
pickup.
With
the
front
and
rear
at
the
same
level,
but
one
inverted
in
phase,
the
result
is
the
classic
figure
‐
8: