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SYNC
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BIT COUNT
FRAME
START
HOURS
(
units
)
1 2
4
1
HOURS
(
t
#
ns
)
10
20 0 0
FRAMES
(
units
)
FRAMES
(
tsns
)
n
BIT VALUE
+
1
2
4 1
10 20
1
2
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BIT NUMBER
^
00 01 02 03 04 05 06 07 01 09 10
11
12 13 14 15 16 17
43 44 45 45 47 48 49 50 51
52 53 54
55 56
57 59 50 60
61
62 63 64
2
+
4
+
10
-
16 th HOUR
1
+
2
+
20
-
23 rd
FRAME
SECONDS
(
units
)
1 2
4 8
SECONDS
(
tens
)
1 0 2 0 4 0
RS
SYNC WORD
o
o
LTLJH
_
jnjinjiimnjT
^ ^
13 14 15 IS 17 IB 19 20
21 22 23 24
25 28 27 21 29
30 31 32
33
I
I I I
t I
I I I
I I
i
I I I
6 0
6 4
68
7 2
7 6
7 9
1
+
10
+
20
-
31 st
SECOND
END FRAME
MINUTES
(
units
)
1
2
4
8
MINUTES
(
tens
)
10
20 40
16
,
47
,
31
.
23
27 21
29 30 31 32 33 34 35 38 37 31 39 40 41 42
44
44
45
46 47 48 49
I
1
HOURS MINUTES SECONOS FRAMES
1
+
2
+
4
+
40
-
47 th
MINUTE
Figure 03
.
LTC Word Bit
Assignments
The time code word also has several
. other bits and
groups
of
bits within the data stream for other
encoding purposes
.
n
Eight groups
of four User Bits are
interspersed between the
various time code counter
bits
.
The User
Bits are all set
to
0
,
and are available for whatever
auxiliary encoding
that
the
user
might
want to assign to them
.
It should be noted that
the
APR
-
5000
does not
generate or display
User Bits
,
as
must be done by an external time code
generator
.
The machine
does
,
however
,
record and
output
the bits in the
same manner
as
any
other bits in the time code word
.
Bit 10 is called the
Drop
Frame Bit
.
Time code generated in
Drop
Frame format is
identified
by having
this bit set to
a
digital
1
.
Bit 11 is the Color Frame Bit
,
and when set
to a
digital 1 it
indicates that color frame
identification
has
been applied to the time code
signal
.
Bits 64 through 79 comprise the
Sync
Word
.
The
Sync
Word is
detected
by
an external time
code
reader
as
the end
of the
time
code word
.
determine whether the
tape
is
running
in
the
forward
or
reverse direction
.
These
sixteen bits
will
always
have the
same
value in
every
LTC word
.
this
It is also
used
by
an external reader
to
y
C
-
4
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