English – SCHOEPS MAB 1000 Benutzerhandbuch
Seite 15
SCHOEPS GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050
www.schoeps.de · [email protected]
15
English
OCT Surround / Surround with OCT + additional system
2. OCT Surround = OCT Front System + 2 cardioids; with 2× MAB 1000 + CB MAB
the simplest array for surround sound
using OCT (viewed from top)
CCM 41VL or
CCM 41L
8 cm
20 cm wider than at the front, max. 100 cm
CCM 41VL or
CCM 41L
40 cm
CCM 4L
CCM 4L
CCM 4L
C
L
LS
RS
R
40 – 90 cm, dependent on
the intended recording angle*
FRONT
The surround cardioids face rearward to avoid
picking up direct sound. Time-of-arrival and
level differences between each side's cardioid
and hypercardioid pair produce a stereophonic
representation of lateral sounds to match the
forward image. Imaging will therefore remain
correct for listeners who turn towards the L/LS
or R /RS sectors. This produces a convincing
spatial perspective.
3.1 OCT Front System
+ IRT cross
3.2 OCT Front System
+ Hamasaki Square
IRT cross CB 250 or CB 200,
e.g. with 4× CCM 4L compact microphones
L
LS
RS
R
length of side:
20 – 25 cm
several
meters
several
meters
LS
RS
length of side:
2 – 3 m
+
+
+
+
Hamasaki Square,
e.g. with 4× CCM 8L compact microphones.
The figure-8s have their nulls turned to the
front so that this array is relatively insensitive
to direct sound.
–
–
–
–
OCT according to 1.1 - 1.3
OCT according to 1.1 - 1.3
L
R
In the following two microphone arrange-
ments signals from the front two microphones
of the additional group are blended into the
main L and R front signals without further pro-
cessing. This helps to prevent dissociation bet-
ween the front and rear images, while the
separation between the arrays allows optimal
placement of each, for direct and for ambient
pickup respectively.