Microphone Mixing During Recording; Recording Level Adjustment; Automatic Record Muting; Dolby Hx Pro Headroom Extension - JVC TD-W717TN Service Manual

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ALTERNATE CONTINUOUS
RECORDING BETWEEN
DECK A AND DECK B WITH AUTOMATIC SELECTION
MICROPHONE MIXING DURING RECORDING
Dolby HX PRO headroom extension
When a source which contains many high
-
frequency
compo
-
nents
is recorded
,
these high
-
frequency signals have the
same
function
as bias and
therefore , the effective
bias
current
changes
.
This will result in phenomena such as changes in the level of
low
-
frequency signal
and subsequent distortion and
reduction
of the high
-
frequency saturation level
.
Dolby HX PRO headroom extension system
controls the bias
current
so that the effective bias is constant even when there
are
fluctuations
in
the high
-
frequency components of
the input
signal
.
This greatly improves the high
-
frequency saturation
level while
reducing the low
-
frequency signal
level variations and distor
-
tion
.
The dynamic sound
recorded with this
system
sounds the
same
even
when the
tape
is played back in a deck that does
not have Dolby HX PRO
.
This
system
automatically
works when in recording ; how
-
ever
,
Dolby HX PRO
is not a noise reduction
system
.
AUTOMATIC RECORD MUTING
By connecting
a microphone
,
microphone mixing during
recording
Is possible by following the recording procedure
.
Adjust
the
microphone input
level by setting the record
-
pause
mode and observing the peak
level
indicators
.
When the record
-
pause mode is set and the INPUT LEVEL
control
is set to
MIN
, sounds are output only from the micro
-
phone
,
and it can be used as a public address
system
.
This
facility is used to eliminate undesired sections and leave
an appropriate
non
-
recorded section
.
o
©
V
CcSlr
A
.
To leave non
-
recorded sections of
about 4
-
5
seconds auto
-
matically
1
.
When the undesired section comes during recording
,
press
the
REC
/
REC MUTE button and release it
.
2
.
The REC indicator flashes and a non
-
recorded section
is
made during
record muting
operation
.
About 4
-
5
seconds later
,
the tape automatically stops
,
and
the
unit
enters
the record
-
pause
mode
.
3
.
Press the PLAY button to start recording again
.
B
.
To leave non
-
recorded
sections of more
than 4
-
5 seconds
1
.
Keep the
REC
/
REC MUTE button pressed continu
-
ously as long as you want to
make a non
-
recorded
section
.
By releasing the finger from the button after
the
above operation ,
the
unit
enters
the
record
-
pause
mode
.
2
.
Press the PLAY button to start recording again
.
C
.
To leave non
-
recorded
section of less than 4
-
seconds
When the undesired section comes during recording
....
After the
REC
/REC MUTE button is pressed ,
press
the
PLAY button before the unit enters the pause mode to start
recording again , or press the
ll
PAUSE button to enter the
record
-
pause
mode
.
The peak level indicator lights
even
during
record muting
according to
the input level
which can be
heard
from the
speakers or headphones so that recording can be resumed
at the exact point on the tape
.
RECORDING LEVEL ADJUSTMENT
O
o
DOU
3
Y
NR
REYER
5 E
MODE
Adjust the recording
level while observing the peak level indi
-
cator Indication
.
For example :
With Type IV ( metal ) tape
( TD
-
W
7
SD )
0
i
-
30 20
15
12
10
8
6
ovu
2
m
0
L
.
n a a o o o u a a a a o n r a o a a c D D C
2
4
6
-
t
-
SdB
REC
/
REC MUTE
PAUSE
R
«
=
,
=
«
=
,
( TD
-
W 717 / 718 )
I
-
30 20
15
12 10
8
6
ovu
2
00
0
2
4
^
o a a a a o a u j a a o a c a c i c o c D O C o a c j a t n
6 + 8
dB
©
©
R
a n a o u a o a
a a r
REC
/
REC MUTE
Because of metal
tape
'
s higher saturation
level
,
It Is OK that
occasionally
,
"
+
4
"
lights
on
the TD
-
W 7 SD
, and "
+
2
"
lights on
the TD
-
W 717 / 718
.
ERASING
When recording on a prerecorded tape , the previous recording
is automatically erased and only the new program is recorded
on the tape
.
To erase a tape without making a new recording
..
.
Follow the
section " RECORDING
'
' but in step
©
,
set the INPUT
LEVEL control to MIN
.
With Type I ( normal ) or Type II ( chrome ) tape
L
2
4
6
8 dB
©
Load the tapes
to
be recorded in decks A and B with sides
A facing out
.
( Be sure
to wind past the
leader tapes
.
)
Q
Press the
( direction )
buttons to select the
tape transport
directions of decks A
and B
.
0
Set the
DOLBY NR switch
as required
.
o
set the REVERSE MODE switch
to
<
* : >
.
©
Set deck A
to the record
-
pause mode and
adjust the record
-
ing level
.
Q
Set deck B
to
the record
-
standby mode
,
(
press only the
REC
/
REC MUTE button
.
)
In this time
,
the REC
and CONT indicators light , and the
^
or
indicator flashes
,
showing the direction of the next
tape
that will
be
recorded
.
Q
Press
the PLAY button
of deck A
;
continuous recording
starts
.
When recording finishes in one
deck and
continues in the
other
,
the CONT
indicator goes off
and the
4 or
Indicator
stops flashing
.
When side B of deck A finishes recording , deck B starts
recording automatically
.
If
both decks start recording
from
the beginning of side A ,
the continuous recording will
be
done for
about 3
hours
with two C
-
90 tapes
.
When starting
recording from deck B , set
deck B
to the
record
(
or record
-
pause ) mode
first
and set deck A
to
the record
-
standby
mode
.
R
Qta
eso rao
1
=
3
c
=
n
It Is OK that
"
+
0 " lights occasionally
.
LINEAR TAPE COUNTER OPERATION
When the power is connected
,
"
0.00 "
appears in the display
.
During tape playback
,
the digital counter
operates as a 4
-
digit
linear tape counter
which displays
the approximate playback
time in minutes and seconds for C
-
46 L , C
-
60 , and C
-
90 tapes
.
There is a one
-
minute error differential between the
actual play
-
back time and the playback time displayed
.
With C
-
30 , C
-
46
,
C
-
80 , and other tapes ,
this differential is even greater
.
A differ
-
ent time
may also appear
for tapes
of the same length but with
a
different thickness
.
When the recording
level is too low
,
the hiss noise
Inherent
in the tape will be conspicuous
.
When the recording
level is too high ,
exceeding
the satura
-
tion level
,
the recording will
contain cracking
noise and will
be distorted
.
If "
+
4 "
lights too
often because the
recording
level is too
high , the
recorded
sound may be
distorted and
seem to be
breaking up
.
If only " O " lights infrequently , the level is too
low
and the recording may contain
tape hiss
.
It is best to adjust so that the maximum sound level of the
source to be
recorded
reaches the very
limit
of the saturation
level of the tape to be used
.
The
best
level
varies depending on the type
of music and type
of tape so it Is better to make a test
recording
,
using FM music ,
records , etc
.
DOLBY NR and DOLBY HX PRO
Dolby NR System
To reduce
the hiss inherent in tape recording , use the Dolby NR
System
when making recordings
.
When listening to a tape
recorded
with
the Dolby NR System , set the DOLBY NR switch
to B
or
C according to the
system
selected in the recording
mode
.
Note :
The sound quality will change if the positions of the DOLBY NR
switch are different in recording
and playback
.
HH
To
cancel the
record
-
standby mode
.
Press the
( stop )
button on the
deck
during
record
-
standby
.
OD
1
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-
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-
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