Denon AVC-3000 - Page 38

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(2) Dolby Pro-logic surround circuit
AVG-3000/3000G
provides
Dolby
pro-logic
surround
circuit
surround
decoder
which
functions
same
as
Dolby
surround
decoder
for
professional
use.
The
circuit
is
also
called
active
decoder,
and
it
comprises
a
different
circuit
from
passive
decoder, conventionally employed for home use labelled as "Dolby surround." (Figure 4)
Directional enhancer to produce crisp sound image travel.
Main
feature
is
Directional
enhancement
circuit.
The
conventional
Dolby
surround
circuit
is
designed
to
control
3
channels
(L.R.S),
but
this
circuit
provides
a
new
center
channel
and
4
channels
(L.R.C.S.)
control,
and
employs
speaker
system
same
as
that
of
a
theater
to
produce
the
sound
effect.
A
merit
of
directional
enhancement
circuit
is
greatly
improves
the
front
and
rear
sound
separation
to
provide
a
sharp
and
dynamic
front
and
rear
sound
image
traveling.
Conventionally
the
front
and
rear
separation
is
around
3
dB,
but
the
pro-logic
provides
approximately
26
~
40
db.
(Figure
5,
6).
The
directional
enhancement
circuit
controls
left,
right,
center
and
surround
signals
independently,
and
the
sound
image
is
very
crisp
and
clear.
With
the
conventional
Dolby
surround,
the
center
sound
image
is
nothing
but
compound
of
L
and
R
channels,
but
the
pro-logic
has
an
independent
center
channel
to
produce
the
sound
image,
and
achieved
approximately
26
~
40
dB
L
and
R
channels
separation.
When
the
sound
image
is
at
center,
both
L
and
R
channel
output
are
cut
down
and
as
the
sound
image
travels
to
L
channel,
center
and
R channel
output are
cut
to
enhance
the
travel
of the
sound.
Feature of Pro-Logic mode
@ NORMAL: Signals which below 100Hz is cut are applied to center channel, and the signals below 100Hz are applied to L
and
R
front
speakers.
Employ
L
and
R
speakers
of
a
certain
grade
(as
a
pointer,
use
ones
better
than
book-shelf),
and
use a smaller speaker for the center channel.
@ WIDE: Normal signal is applied to center channel as it is. Employ speakers of the same grade (better than book-shelif) for
center channel as well as L and R speakers.
@ PHANTOM: Center channel signals are evenly applied to L and R channels. When a center speaker is not available, this
mode is employed. Even without the center channel, the directional enhancement circuit functions as it is.
@ 3CH LOGIC: "3CH LOGIC" mode built in remote control, is to enjoy the surround mode without the surround speaker. In
normal pro-logic mode, rear (Sch) outputs reversed phase of Lch, Reh input, but in this mode the output is mixed with the
front direction Lch and Rch outputs.
@ TEST TONE (Remote control): Used to adjust output level of each channel.
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