User Manual
3,902,007
9
blanked
guard-band
interval
within
the
video
intel
ligence
portion
of
the
scan
lines;
branching
the
signal
path
of
the
selected
signal
which
includes
said
plurality
of
audio
bursts
during
the
blanked
guard-band
interval;
time
delaying the
selected
signal
in
one
of
the
branched
signal
paths;
gating
the
signals
corresponding
to
both
the
delayed
and
undelayed
signals
in
the
branched
signal
path
to
recover
said
plurality
of
audio
bursts
from
the
blanked
guard-band
intervals
therein;
detecting
the
gated
audio
bursts to
form
an
audio
sig
nal;
and
amplifying
the
formed
audio
signal
to
drive
a
sound
transducer.
8.
The
method
according
to
claim
7
wherein
said
time
delaying
the
signal
corresponding
to
the
horizon
tal
scan
line
signal
in
one
of
the
signal
paths
occurs
for
a
period
of time
corresponding
to
the
time
period
of
a
horizontal
scan
line.
9.
The
method
according
to
claim
7
including
the
step
of
detecting
said
plurality
of
audio
bursts
to
form
an
audio
signal.
10.
The
method
according
to
claim
7
wherein
said
plurality
of
audio
signal
bursts
are
gated
from
the
signal
corresponding
to
the
undelayed
horizontal
scan
line
at
intervals
of
time
occurring
in
a
time
displaced
manner
from
the
intervals
of
time
for
gating
the
signal
corre
sponding
to
the
delayed
horizontal
scan
lines.
11.
The
method
according
to
claim
7
wherein
said
gating
the
signal
occurs
in
a
manner
to
supply
a
signal
for
said
time
delaying.
12.
The
method
according
to
claim
9
including
the
step
of
amplifying
the
signal
produced from
said
plural
ity
of
audio
bursts
to
form
an
audio
output
signal
for
driving
a
sound
transducer.
13.
In
a
television
branching
system,
an
apparatus
to
transmit
within
a
single
television
frequency
channel
one
or
more
audio
signals
along
with
at
least
one and
less
than
all
of
two
or
more
separate
and
branched
video
pictures
using
the
same
video
subcarrier,
said
ap
paratus
comprising:
gate
means
including
an
add
circuit
to
form
?elds
of
a
video
signal
corresponding
to
selected
horizontal
scan
lines
for
transmitting
branched
video
pictures,
said
means
being
operable
to
select
a
horizontal
scan
line
corresponding
to
a
?rst
video
picture
and
then
selecting
the
next
horizontal
scan
line
for
transmission
from
a
second
picture
which
is
then
succeeded
by
selecting
a
subsequently occurring
horizontal
scan
line
from
said
?rst
picture;
means
for
sampling
said
audio
signals
to
produce
trains
of
time-separated
audio
bursts
which
trains
of
audio
bursts
occur
at
a
rate
less
than
the
occur
ring rate
of
horizontal
scan
lines
selected
to
form
the
?elds
of
branched
audio
pictures;
blanking
means
responsive
to
control
pulses
occur
ring
at
a
rate
less
than
the
horizontal
scan
rate
of
said
?elds
of
video
signal,
said
blanking
means
being
coupled
in
the
video
signal
path of
at least
one and
less
than
all
of
the
branched
video
signals
for
de?ning
a
guard-band
blanked
interval
within
the
video
intelligence
portion
of
the
horizontal
scan
lines
selected
by
said
gate
means
to
form
at
least
one
and
less
than
all
of
the
branched
video
pictures;
and
20
25
35
45
55
60
65
10
means
including
an
encoder
receiving
the
trains
of
time-separated
audio
bursts
and
receiving
the
sig
nal
corresponding
to
the
branched
video
pictures
for
modulating
the
same
video
subcarrier
with
both
the
video
signal
corresponding
to
selected
horizon
tal
scan
lines
forming
the
branched
video
picture
and
the
train
of
time-separated
audio
bursts
only
during
said
guard-band
blanked
interval.
14.
The
apparatus
according
to
claim
13
wherein
said
means
for
sampling
include
?rst
and
second
audio
sig
nal
samplers
and
said
means
for
controlling
including
monostable
multivibrator
means
for
rendering
said
sec
ond
sampler
conductive,
said
apparatus
further
com
prising
means
receiving
horizontal
sync
pulses
for
pro
ducing
pulses
to
control
said
?rst
sampler
and
said
monostable
multivibrator.
15.
The
apparatus
according
to
claim
14
further
comprising
delay
means
in
the
path
of
the
audio
signal
delivered
to
one
of
said
audio
signal
samplers.
16.
The
apparatus
according
to
claim
14
wherein
said
?rst
and
second
audio
signal
samplers
receive
separate
and
independent
audio
signals.
17.
The
apparatus
according
to
claim
14
further
comprising
means
for
combining
the
pulses
delivered
from
said ?rst
and
second
samplers
to
form
said
train
of
time-separated
audio
bursts.
18.
The
apparatus
according
to
claim
13
further
comprising a
means
for
receiving
said
audio
signal
bursts
transmitted
on
said
video
subcarrier
and
means
for
detecting
said
audio
signal
bursts for
recovering
an
audio
signal
represented
thereby.
19.
The
apparatus
according
to
claim
18
further
comprising
means
for delivering
video
signals
to said
means
for
encoding
in
the
form
of
a
selected
horizontal
scan
line
from
one
of
said
separate
video
pictures
fol
lowed
by
a
selected
horizontal
scan
line
from
a
second
of
said
separate
video
pictures
which
is
succeeded
by
a
subsequent
horizontal
scan
line
from
said
?rst pic
ture.
20.
In
a
television
branching
system,
an
apparatus
for
receiving
within
a
single
television
channel
one
or
more
audio
signals
along
with
two
or
more
branched
and
sep
arate
video
pictures
on
the
same
video
subcarrier,
said
audio
signals
being
transmitted
in
the
form
of
a
plural~
ity
of audio
bursts
during
a
blanked
guard~band
interval
which
occurs
within the
video
intelligence
portion
of
the
horizontal
scan
lines
selected
a
transmit
at
least
one
and
less
than
all
of
two
or
more
of
the
separate
and
branched
video
pictures,
said
apparatus
comprising:
means
for
detecting
said
video
subcarrier
modulated
with
said
two
or
more
separate
and
branched
video
pictures
of
which
at
least
one and
less
than
all
con
tain
a
blanked
band
in
the
video
intelligence
por
tion
when
displayed
on
the
face
of
a
television
dis
play
tube,
said
blanked
band
corresponding
to said
blanked
guard~band
interval
containing
a
plurality
of
audio
bursts;
gate
means
coupled
to
said
means
for
detecting;
line
sharing
pulse
generator
means
for
controlling
said
gate
means
to
select
from
the
video
subcarrier
only
the
horizontal
scan
lines
containing
the
blanked
guard-band
interval
and
forming
at
least
one and
less
than
all
of
the
branched
and
separate
video
pictures;
means
coupled
to
said
gate
means
for
branching
into
separate
signal
paths
the
signal
corresponding
to
the
selected
horizontal
scan
lines
having
the
plural