Inovonics DYNEX User manual
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TABLE
OF
CONTENTS
I.
GENERAL
INFORMATION
AND
SPECIFICATIONS
3
II.
INSTALLATION
.
6
III.
OPER
AT
ION
ANO
FUNCTIO
NAL
DESCRIPTION
7
IV.
CIRC
UI
T
DESCRIPTION
13
v.
ALIGl~MENT
AND
CALI
BRATION
15
111
ustrati
ons
1-1
DYNEX
Noise
Suppression
Characteristics
4
1-2
Broadband
Expansion Transfer Function 5
3-~}
3-2
Dynamics
of
DYNEX
Rumble
Suppression 9
3-~}
Dyna
m
ics
of
DYNEX
Hiss Suppression
10
3-4
3-5
Dyn
am
ics
of
Wideband
Noise Suppression
11
-2-
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I.
GENERAL
INFORMATION
T
he
Inovonics
DYNEX
is
a program-
controlled
fi
lter/expander
offering
a si
mple
yet
effective
means
of
suppressing a
certain
amount
of
the
residual background noise
present
in
most
audio transmission
and
re
-
cording/reproducing systems.
DYNEX
is
a single-ended device,
rather
than a
full
comple
men
tary
com-
pression/
expansion :ioise Reduction System, but should not be confused
with a
si
mple
noise "gate,
11
or
program-actuated s\-.,itch.
In
its
oper-
ation,
DYNEX
first
introduces a fixed
amount
of
either
frequency-selective
or
bro
adband
signal
loss,
and
then
linearl
y re-expands program gain
to
a
flat,
unity value
when
energy in the suppressed
band
exceeds a
selected
threshold value.
DYNEX
uses include:
Reduction
of
surface noise
or
rumble
in
disc
playback equipment.
Suppression
of
r-~gne
tic
asperity
noise
(tape
hiss)
in
tape
or
fil
m
reproducing systems.
Quieting
of
optic
al film sound channels.
Improving
S/N
in
interface
between
low
grade
te
lephone
line
and
broadcast
facilities
.
Among
the features
of
DYNEX
are
:
Choic
e
of
operating
modes
for
selective
suppression
of
low
frequency,
mechanical nois
es,
higher
order
system
noise,
or
a combination
of
both,
and
restorc~ion
of
pro
gram
dynamic
range
by
linear
broadband
expansion.
Variable Thresho
~d
adjustment
to
permit
optimum
selection
of
the
point
of
which
re-expansion begins.
Visual
indicatic
~
of
Threshold coincidence
and
ful l expansion.
Avail
ability
i
nt
var
iety
of
versions
for
professional
or
semi-pro
require
ment
s.
-3-
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DYNEX
SPECIFICATIONS
Frequency Response: ±0.5dB,
20Hz
-
20kHz
Output Noise Level: below
-85dBm
Distortion:
be
l
ow
0.1%
THO
up
to
+lOdBm
output
below
0.3%
THO
up
to
+23dB
m output
(Clipping level above
+24dBm)
Noise
Sup
pression Chara
cteristics:
RUMBLE:
Choice
of
two
LF
rolloff
curves (Fig. 1-1; A &
B)
with
restoration
to
flat
response
when
low
frequency energy
exceeds
preset
Threshold.
HISS:
Choice
of
two
HF
"shelving" curves
(Fig.
1-1; C &
D)
with
restoration
to
flat
response
when
high frequency energy
exceeds
preset
Threshold.
WIDEBAND
NOISE:
LF +
HF
rolloff
characteristic
(Fig. 1-1;
E)
with
restoratio
n
to
flat
res
pon
se
when
energy in suppressed
band
exceeds ·
preset
Threshold.
LINEA
R
EXPAND:
lOd
B
of
broadba
nd
program
attenuation
with
linear
re-expansion to
unity
gain beginning
at
Threshold (Fig. 1-
2).
+5
,----,
-
--,--,-,......,....--,--,-~--r---,----,-·r-
,-.--,-..,.........-,---,,---~
---r--
--:--r-
--:----:-r-
rr---r--,
!i
I I I I ! I
20
so
100 200
500
lk
2k
5k
] 0
1<
Fig.
1-1
-4-
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Input:
+10
O
dB
.-10
0
u
T -20
p
u
T -
30
-
40
-
50
V
-50
l7
V
,/
•
'./I
,V
I,
'
✓
V
1
..
/
I
lOdB
/
I(
-b
/ ,v
/ V I
/
~
~7
hreshold
I l
/
-
40
-30 -20 -10
OdB
+10
I NP UT
Fi
g. 1-2
lOOK
unbalanced (transformer
optional)
for
nominal
studio
line
levels
of
+4
or
+
8dBm
. -
03
version accepts unbalanced inpu
ts
betw
een -10
and
OdBm
.
Output:
Feed
s
600
ohm
lines
or bridging
inputs
at
no
mina
l
lin
e lev
els
.
Clipping level in excess of
+24dB
m.
Power
Requ
ir
ement
:
105
-
130VAC
(230V
available)
,
50/60Hz;
O
.l
A.
Size
and
~/eight:
1-7/8
'' X
8-1/2"
X
6-
1/
2";
4
lb
s.
- 5-
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