Radio Shack Amplified Video Selector User Manual Page 5
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1
VIDEO
BUS
FIELD
OF
THE
INVENTION
The
present
invention
relates
to
an
interconnection
arrangement
for
a
component
video
system
and
more
particularly
to
a
signal
bus
connection
arrangement
for
selectively
distributing
video
signal
among
the
various
video
components.
BACKGROUND
OF
THE
INVENTION
With
the
increased
popularity
of
various
home
enter
tainment
video
components,
such
as
video
disc
and
tape
players,
home
computers
and
satellite
TV
receivers,
the
interconnection
of
these
components
has
become
more
complex.
One
interconnection
method
is
to
manually
connect
cables
between
the
components
which
are
presently
to
be
used.
This
method
is
obviously
unsatisfactory
due
to
the
manual
re-arranging
of
cables
required
each
time
it
is
desired
to
operate
the
system
in
a
different
manner.
Another
approach
is
to
couple
each
component
to
a
plurality
of
switches,
which
may
be
centrally
located
or
distributed.
The
switches
can
be
manually
or
remotely
controlled
to
route
the
various
video
signals
between
speci?c
ones of
the
components
to
enable the
system
to
operate
as
desired
by
the
user.
Although
this
approach
is
more
satisfactory
than
the
?rst,
it
requires
extensive
cable
connections
to
the
switches,
which
are
unsightly,
subject
to
signal
discontinuity
because
of
the
many
connections
and
somewhat
complicated
for
the
user
to
set-up
and
control.
Additionally,
the
complexity
of
this
type
of
system
increases
with
the
addition
of
future
components.
US.
patent
application
Ser.
No.
508,605
entitled
A
Distributed
Switched
Component
Audio/Video
Sys
tem
?led concurrently
with
the
present
application
in
the
name
of
B.
W.
Beyers,
describes
an
audio/video
component
interconnection
system
including
a
video
signal
conductor
having
a
given
characteristic
impe
dance
for
transferring
video
signal
in
a
serial
manner
among
the
video
components.
A
switch
located
in
series
with
the
video
conductor,
when
non-conductive,
sepa
rates
the
continuity
of
the
video
conductor
into
?rst
and
second
segments
so
as
to
allow
simultaneous
and
inde
pendent
video
signal distribution
among
the
video
com
ponents
associated
with
the
?rst
and
second
segments.
It
is
herein
recognized
that
when
the
continuity
of
the
video
signal
conductor
in
the
above
described
system
is
interrupted,
provision
must
be
made
for
proper
impe
dance
levels
at
the
discontinuity
presented
by
the
non
conductive
switch
in
order
to
minimize
undesired
signal
re?ections.
SUMMARY
OF
THE
INVENTION
In
accordance
with
the
principles
of
the
present
in
vention,
a shunt
switch
arrangement
coupled
to
the
video
conductor
at
the
junction
of
the
video
signal
conductor
and
the
series
switch,
applies
a
predeter
mined
impedance,
preferably
substantially
equal
to
the
characteristic
impedance
of
the
video
signal
conductor,
between
the
conductor
and
a
reference
potential.
The
shunt
switch
is
conductive
when
the
series
switch
is
non-conductive.
BRIEF
DESCRIPTION
OF
THE
DRAWING
FIG.
1
illustrates
partially
in
block
diagram
form
and
partially
in
schematic
diagram
form
a
video
component
10
25
30
35
40
45
55
60
65
2
interconnection
system
constructed
in
accordance
with
the
principles
of
the
invention;
and
FIGS.
2
and
3
illustrate
in
schematic
diagram
form
details
of
portions
of
FIG.
1.
DESCRIPTION
OF
THE
PREFERRED
EMBODIMENTS
Referring
to
FIG.
1,
a
plurality
of
video
components
are
shown,
each
component
having an
associated
con
nection
stage
for
controlling
the
transmission
and/or
reception
of
video
and
audio
signals
to
or
from
other
ones of
the
video
components.
More
speci?cally,
a
TV
monitor
10,
a
video
signal
source
12
and
a
video
tape
recorder
14
are
shown
as
examples
of
typical
home
video
components.
Video
signal
source
12
may
com
prise
a
TV
tuner
and
a
detector
for
providing
baseband
video
signals
and
stereophonic
left
and
right
audio
sig
nals.
A
single
cable
16,
including
only
three
signal
conduc
tors
or
buses
and
a
control
signal
conductor
or
bus,
serves
to
couple
the
video
and
audio
signals
between
each
component,
so
as
to
interconnect
the
component
entertainment
system
in
a
“daisy-chain”
manner
(i.e.,
cable
16
connects
one
component
to
the
next
in
serial
fashion).
Cable
16
includes
a
shielded
conductor
signal
bus
18
having
a
75
ohm
characteristic
impedance
(i.e.,
bus
18
is
a
75
ohm
coaxial
cable) for
distributing
a
base
band
video
signal,
two
shielded
conductor
signal
buses
20
and
22
for
distributing
the
stereophonic
left
and
right
audio
signals
and
a
digital
control
signal
bus
24
for
distributing
control
signals
among
the
various
compo
nents.
'
Each
of
components
10-14
has
an
associated
connec
tion
stage
26—30.
Each
connection
stage
includes
a
logic
circuit
32-36
including
e.g.,
a
microcomputer
and
a
read-only-memory
(not
shown),
which
is
responsive
to
the
control
signals
transmitted
on
bus
24
for
providing
further
control
signals
(as
indicated
by
the
broad
ar
rows)
for
selectively
controlling
the
conductivity
of
signal
switches
and
drivers
(to
be
described
later)
to
selectively
control
the
transmission
and/
or
reception
of
video
and
audio
signal
between
the
associated
video
components
and
cable
16.
Additionally,
a
remote
con
trol
conductor
(not
shown)
is
connected
between
each
connection
stage
and
its
associated
video
component,
for
coupling
a
remote
control
signal
to
the
respective
video
component
for
controlling
its
function.
Logic
circuit
32
associated
with
the
TV
monitor
10
serves
as
a
master
logic
unit
for
controlling
the
opera
tion
of
the
entire
entertainment
system.
The
user
may
transmit
commands
to
the
master
from
a
remote
control
transmitter
38.
Transmitter
38
includes
a
plurality
of
push
buttons
for
allowing
the
user
to
select
any
compo
nent
of
the
entertainment
system
as
a
source
of
audio
and
video
signals
and
any
of
the
remaining
components
as
a
receiver
of
those
signals.
In
response
to
received
commands,
the
master
logic
circuit
32
supplies
digital
control
signals
to
the
remaining
logic
circuits
associated
with
each
of
the
video
components
via
control
bus
24
for
controlling
the
operation
of
the
component
enter
tainment
system.
TV
monitor
10
includes
an
internal
TV
tuner
portion
for
supplying
baseband
video
signal
and
left
and
right
stereophonic
audio
signals
to
buses
18,
20
and
22
and
a
display
and
loudspeaker
portion
for
reproducing
the
video
and
audio
signals
from
these
buses.
- Catalog 1
- \KYMMHAMQ/MSQ 2
- 4,581,644 5
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