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SONY
(2)
Zero
muting
flag
construction
As shown
in
zero
mute
flag
block
diagram, zero
mute
-flag is
active
by
not only
zero detect
but aiso
MUTE
and
INIT
of
system mute
(SYSM) and
attenuate
mode.
DATAI
o-
MT1
When
signal
soes
'hf, 2ero detect
>s
activated.
MT2
Zero
detection
SYSM
o-
Intamal
MUTE
O-
Intemal INIT
O-
F.GL
a-
=LGR
Zero
mute Hag
block diagram
@
Zero
mute
flag
operation
•
The
zero
mute
llag
is
active
during the zero detect
cycle.
•
When
the
SYSM
signal
goes
"H",
the
zero
mute
flag
is
made
active.
•
When
the
MUTE ON
function
in
Attenuate
mode
is
used, the zero
mute
flag
becomes
active.
LATCH
1
J
Max
1/64F
t
FLGL.
FLGR
X*
ve
I
Zero
mute
flag
output
timing
for
the
MUTE ON
function.
(MUTE
OFF
operates
in
the
same
way.)
•
INIT re-synchronization
The
zero
mute
flag
is
active during INIT re-synchronization.
When
INIT
is
pulled
"L"
the
zero
mute
(lag
is
active.
Also,
after
INIT
is
raised "H" (zero) the signal
is
held
active
for
approximately
100ms
(Fs=44.1k).
INIT
_r
Internal
INIT
FLGL
FLGR
^C
Active
JCZ
-FT
+
8Fl
<,d<
ll~
+
SFs-
Zero
mute
flag
output timing
for
INIT
re-synchronize cycle
-61
-
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