RM/SQ/CD-4
INTRODUCTION
Th
e
RM regular
matrix
system
produces
four-channel
sound
in
t
w
o
w
a
y
s
;
i
e, f
rom conventional
2-channel sources through
a synthesizing
ac
t
i
o
n
a
s
in
t
he so-called
2-2-4
system,
and from
2-channel
ma
t
eri
a
l
(
or
i
g
in
a
lly
encoded from 4 channel discrete sources) through
a decoding
ac
ti
on
ba
ck to 4-channels
as in a so-called
4-2-4
system.
In both
,
4
-
c
h
a
nnel
sound is produced
from 2-channel
Land
R signals by addin
g
to
,
o
r
subtracting
from them
.
Sansui, Scheiber,
E-V, Dynaco
,
etc. utilize
the RM system.
They
have some
respective
differences,
but
they
can
all
be
reproduced
practically
in the same manner.
In principle
this is
a
4
-
2
-
4 system which is a fundament
a
l
improve-
ment over the RM system with better
Front-Rear and Left Right
s
epar
a
-
tion.
Also there
is none of the unnaturalness
sometimes
encountere
d
with conventional
RM methods when reproduction
is made in stereo or
monaural
modes
.
This is a superior
method also for reprodu
c
ing
4CH
discs when only ordinary,
conventional
stereo cartridges
are u
se
d.
CD-4 di
s
c
s c
ontain the main stereo si
g
nals
includin
g
the L
a
nd
R
channels
to which
are added
the
Front-Rear
characteristics
.
T
his
is
mixed with a difference
signal that is FM modulated
on a 30 kHz car
rie
r
when the
stereo
record
is cut.
Therefore,
a special
CD
-
4 cartrid
g
e
capable
of reproducin
g
high frequencv
ranges up to 45 kH
z
b
e
comes
necessary
for CD-4 rep
r
oduction
of CD-4 d
i
scs.
Moreover,
a speci
a
l
CD-4
low
capacity
cable
is
necessary
for
connection
between
the
cartridge
and the demodulator.
Thus, special attention
must be given to the use of a CD
-
4 cartridge
and cable
,
but this will
enable a perfect,
discrete
4-channel
reprodu
c
-
tion
.
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