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Патент USA US2403561

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July 9, 1946»
J. P. SMITH
2,403,561
MULTIPLEX CONTROL SYSTEM
Filed Nov, 28, 1942
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Suventor
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.July 9, 1946,
IJ. P. SMITH
2,403,551
MULTIPLEX CONTROL SYSTEM
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Filed Nov'. 28, 194224
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July 9, 1946.
2,403,561
J. P. SMITH
MULTIPLEX CONTROL SYSTEM
Filed Nov. 28, 1942 '
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Patented Julie, 194s
UNITED'STATES PATENT OFFICE
Y
2,403,561
CÓNTROL SYSTEM: '
John P. Smith, Granbury, N. J., assignor to Radio
Corporation of America, a corporation of Dela
ware
Application November 2s, 1942, serial No. 467,227
l
11 Claims. (ci. 177-353)
My invention relates to multiplex systems for
controlling a plurality of channels or devices
and particularly to systems wherein the control
is effected by the transmission of a plurality of
electrical pulses.
One object of the invention' is to provide an
improved method of and means for controlling
.
2
-
trating a variation of the invention shown in Fig
ures 1 and 2,
Figure 5 is a eblock and circuit diagram of a
receiver for use in another embodiment of my in
vention, and
.
Figures 6 and 6e are graphs which are referred
to in explaining the operation of a system using
a plurality of signal channels or devices with
the receiver of Fig. 5.
the use of a single carrier frequency wave or sin
In Fig. 1, the transmitter comprises a pulse
gle communication channel. Another object of 10 generator III which produces a pulse I recurring
the invention is to provide an improved method
at a. certain rate such as 30 per second.
'I‘he
of and means for controlling with a, single Ire
quency carrier wave or single communication
channel a plurality of signal channels or devices
in any desired sequence or grouping. Another
obj ect of the invention is to provide an improved
pulse I is supplied to a delay line II which is
terminated for non-reilection and which is
tapped at a plurality of points to supply at suc
the groups of pulses recurring at a suitable rate
sistor 2I common to the several tubes whereby
cessive points a pulse which is delayed an in
creased amount. The delayed pulses appearing
control system wherein the desired control is
at the several taps are supplied through switches
eil'ected :by the coincidence of two or more pulses.
I2, I3, I4 (and through other switches not
>In’ practicing 'one-of the preferred embodiments
shown) to amplifier tubes I6, I1 and I8, respec
of the invention, pulses are produced in periodi 20 tively, and to other ampliiìer tubes not shown.
cally recurring groups with the individual pulses
The undelayed pulse I is supplied to an amplifier
having a time spacing of a few microseconds, ten
tube I9. The outputs of all the ampliñer tubes
or .twenty microseconds, for example, and with
I6, I'I, etc., are added by employing a plate re
such as 30 groups per second. These groups of
pulses are transmitted to a delay line in a re
a group of time spaced pulses I, 2, 3, 4, etc., is
obtained. In this embodiment of the invention,
ceiver whereby the pulses are delayed diiferent
the time spacing between the first pulse and the
. amounts at a plurality of taps on the delay line.
second pulse is one-half the time spacing between
Each channel or device to be controlled is con
the remaining 'adjacent'pulsea In the example
nected to receive delayed pulses from one of said 30 illustrated, the amplifier tubes I6, IT, etc., are
taps and is also connected to receive pulses from
connected to points on the delay line Il where
a point common to all channels. At the said
the pulse is delayed 10, -30, 50 microseconds, etc.,
common point the delay may be zero or it may ’
thus giving a delay of 20 microseconds between
be the maximum amount. The time spacings of
al1 pulses except the iirst two which have one
the transmitted pulses and the- amounts of delay 35 half this delay ‘between them. It is evident that
at the several delay line taps are such that in
pulse I is always included in the transmitted
each channel one of the pulses taken oñ its delay
group and that any other pulse or plurality of '
line tap is coincident with a pulse (the iirst pulse,
pulses may be transmitted or omitted by closing
for example) taken ofi' the said common point.
or opening the proper switches I2, I3, Il, etc.
Thus any or all channels may be controlled by
For example, in the drawings, the switch I2 is
transmitting or omitting the proper pulse or
shown open whereby the pulse 2 of the group
pulses of the periodically recurring group of
is omitted as indicated by the fact it is shown
pulses
'
in dotted line.
The invention will be better understood from
Fig. 2 shows a receiver forcontrolling a plu
the following description taken in connection
rality of channels in accordance with the in
with the accompanying drawings in which
clusion or omission of particular pulses compris
Figurelisablockandcircuitdiagramofthe
ing the periodically recurring group of pulses
transmitter for one embodiment of theinven
transmitted by the apparatus of Fig. 1. The re
tion,
ceiver includes a delay line 26 to which the pe
FlgureZisablockandcircuitdiagramofa
riodically recurring groups of pulses are applied.
_ receiver for use with the transmitter of Fig. 1,
The delay line 26 may be 'a duplicate of the line
Figures3 to3c arefgraphsthatarereferred
II of Fig. 1, having a non-reilecting termina
to in explaining’l the operation of the system
tion and a plurality of taps along the line.
showninFigalandz,
Tap No. I is connected to the control grid of
Flgure4isablockandcircuitdiagramillus
an amplifier tube 21, which is one of a pair of
2,403,561 '
3
4
.
tubes controlling channel No. I. The other of
these tubes, indicated at 28, has the undelayed re
ceived signal applied _to its control grid. 'I'he
tubes 21 and 28 have a common plate resistor
28 oi' high resistance, the plate end of which goes
either positive or negative a maximum amount
,
to 3c illustrate the operation of Fig. 4 if it is as
sumed that the direction of their time axis is
reversed, i. e., if it is assumed that time in
creases from right to left instead lof from left
to right.
.
Fig. 5 illustrates a receiver for an embodiment
(depending upon the polarity of the received
of the invention wherein all pulses of a trans
pulses) when pulses appear simultaneously on
mitted group >have .the same time spacing. In
the grids oi tubes 21 and 28. Assuming that the
this embodment, the control is sequential, i. e.,
received pulses are of negative polarity, maxi 10 any one of a plurality oi.' channels may be opened
mum positive voltage appears at the plate end
or closed although the flexibility offcontrol pro
of resistor 29 when a pulse on the grid of tube
vided by the previously described embodiment is
21 is coincident with a pulse on the grid of tube
lacking. The evenly spaced pulses I, 2, 3, etc.,
28. This voltage may be applied over a conduc- ,
may be produced at a transmitter similar to that
shown inl Fig. 1. At the receiver they are im
pressed upon a delay line 5I having taps No. l.
tor, indicated by the legend “Channel No. I,” to
an amplifier tube 3| that is biased beyond plate
current cut-off so that only said maximum posi
tive voltage resulting from coincidence of two
particular pulses will cause plate current flow in
tube 3l for control or signalling purposes.
No. 2, etc., evenly spaced from the start of the
line. Each tap supplies signal to one of a pair of
tubes, the other`tube of each pair having unde
layed signal applied thereto over a conductor 52.
For example, tap No. I is connected to the grid
Similarly, taps No. 2, No. 3, etc., are connected
to thegrids of vacuum tubes 32, 33,_respectively,
and to others not shown. The tubes 32 and 33
of tube _53`while the conductor 52 is connected
t0 the grid of the other tube 58 of the pair of
are associated with 'vacuum tubes 34 and 36, re
tubes 53-54.
'
spectively, which have applied to their grids
Just as described in connection with the re
through the common conductor 35 the same un
ceiver of Fig. 2, each pair of tubes such as the
pair 53-54 supplies a control pulse to its partic
delayed signal that is applied tothe grid of tube
28. The pairs of tubes 32-34 and 33-35 have
common plate resistors 31 and 38, respectively,
ular control channel in response to the simul
taneous application of pulses to the control grids
the plate ends of which are connected to vacuum 30 of the two tubes. The sequential control is illus
tubes 33 and 4I, respectively, through the con
trated by the graphs in Figs. 6 to 6c. Comparing
ductors indicated by the legends “Channel No.
Figs. 6 and 6a, it will be seen that if pulses I and
2” and “Channel No. 3.” By using plate resistors
6 are transmitted, the pulse I appearing at tap No.
29, 31, etc., of high resistance and by apply
5 will be coincident with the undelayed pulse 8
ing a small amount of positive bias to the grids,
whereby channel No. 5A will be controlled. If
the pulse output of a pair of tubes is of large am
only Ithese two pulses are transmitted, there will
plitude when coincident pulses are applied to the
be no coincidence of pulses at any other channel.
grids.
.
v
To control any particular channel, pulse I is
The operation of the system of Figs. 1 and 2 is
always transmitted together with one other pulse
shown more clearly by the graphs of Figs. 3 to 3c.
assigned to that particular channel. For exam
Comparing the graphs of these iigures, it will be
ple, comparing Figs. 6 and 6c, pulses I and 4 will
seen that of the pulses applied to the common
be transmitted to control channel No. 3A and
conductor 35, the pulse 2 is coincident with the
there will be no coincident pulses at the other,
pulse I of the group appearing at tap No. I. Thus
channels. It will be noted that in this embodi
channel No Il is controlled by pulse 2; specifically,
ment control of one channel (such as No. 5A) is
if pulse 2 is included in the transmitted group, 30
pulses per second will be produced in the plate
circuit of tube 3l and these pulses may be utilized
for any desired control or signal purpose. If the
pulse 2 is omitted from the transmitted group by
-opening the switch I2, then no control will ap
pear in the plate circuit of the tube 3 I . since none
of the remaining pulses is coincident with any
pulse appearing at tap No. I. Similarly, a com
parison of Figs. 3 and 3b and of Figs. 3 and 3c shows that pulse 3 controls channel No. 3 and
that pulse 4 controls channel No. 4. Likewise,
the pulses 5, 5 and 1 may be utilized to control
additional channels, not shown. By employing
this embodiment of the invention any channel or
any number of channels can be controlled by
means of pulses sent over a single communica
tion channel such as a single carrier wave.
As illustrated in Fig. 4, a variation of the above
described embodiment of the invention may be
employed wherein the common conductor 35 is
connected to the end of the delay line 26 rather
than to the start of the line and wherein the 10
niicrosecond delay occurs at the end of the line
rather than at the start of the line. With this
arrangement, all the transmitted pulses have the
full-time or 20 microsecond spacings except the
last two pulses which have the one-half or 10
' microsecond spacing. ’I'he operation is the same~
released when pulses are transmitted to take over
control of a diiferent channel (such as No. 3A).
If this is an objectionable feature for certain ap
plications of the invention, then the ñrst de
scribed embodiment of the invention should be
employed.
'
.
I claim as my invention:
\
1. A multiplex system comprising means for
producing a group of time spaced pulses, means
for transmitting said group of pulses to a re
ceiver which includes a delay line, means for sup- .
plying said group of pulses to said delay line
whereby they are delayed as they travel along
said line, a plurality of circuits each of which is
responsive to a plurality of coincident pulses,
each of said circuits being connected -to a different
point along said delay line whereby each circuit
receives said group of pulses delayed different
amounts, means for also supplying said group of
' pulses to said circuits with the same amount of
delay at each circuit, and means for including or
omitting pulses from said transmitted group
whereby pulse coincidence may be made to occur
at the desired circuit at the receiver.
2. A multiplex system comprising means for
producing periodically recurring groups of time
spaced pulses, means for transmitting said groups
of pulses to a receiver which includes a delay
line, means‘for supplying said groups of pulses to
as previously described. 'I'lie graphs of Figs. 3 75 said delay line whereby they are delayed as they
2,403,561 »
5
6
travel along said line, a plurality oi.' circuits- each
of which is responsive to a pluralityof coincident _
connected to evenly time-spaced points along said
delay line with the time spacing equal to said
pulses, each of said circuits being connected to
a different point along said delay line whereby
each circuit receives said groups of pulses delayed
different amounts, means for also supplying said
certain value whereby each of said certain cir
cuits receives said group oi’ pulses delayed differ
ent amounts, another of said circuits being con
nected to a point on said delay line where said
groups of pulses to said circuits with the same
group of pulses is delayed by an amount equal to
amount of delay at each circuit, and means for
one-half said hcertain value, means for also sup
including 'or omitting pulses from said transmit
plying said group of pulses to said circuits with
ted groups whereby pulse coincidence may b_e 10 the same amount of delay at each circuit whereby
made to occur at the desired circuit at the
coincidence of certain pulses is obtained at cer
receiver.
'
"
tain 0i.' said circuits, and means for including or
3. The method oi’ controlling a plurality of cir
omitting pulses from said transmitted group
cuits at a. remote point which comprises produc
whereby pulse coincidence may be made to occur
ing a group of time spaced pulses, transmitting 15 at the desired circuit at the receiver.
said group of pulses to said remote point, delay
7. A multiplex system comprising means for
ing said group of pulses different amounts at
producing a group of time spaced pulses, said
said remote point to produce differently delayed
group comprising a plurality o'f successively oc
groups of pulses, supplying to each of said circuits
curring pulseshavingsimilartimespacingpre
one of said delayed groups of pulses with the de 20 ceded' by a pair of pulses that have a dißerent
lay of said group different at each circuit, also
time spacing, means for transmitting said group
supplying said group of pulses to said circuits
of pulses to a‘ receiver which includes a delay line,
with the same amount of delay at each circuit,
a plurality of circuits each oi.' which is responsive
and including or omitting pulses from said trans
to a plurality of coincident pulses, certain of said
mitted groups whereby pulse coincidence may be 25 circuits being connected to points along said de
made to occur at the desired circuit at said remote
lay line where the delay between said points is
point.
the same as said similar time spacing whereby
4. The method of controlling a plurality of cir
each of said certain circuits receives said group
cuits at a remote point which comprises produc-iy
of pulses delayed diiîerent amounts, another of
ing periodically recurring groups of time-spaced 30 said circuits being connected to a point near the
pulses, transmitting said groups of pulses to said
remote point, delaying said groups at said remote
start of said delay line where said group of pulses
is delayed by an amount equal to said diilerent
point by different amounts equal to the time
time spacing, means for also supplying said group
spacing of said pulses, supplying to each of~said
_of pulses to said circuits with the same amount of
circuits one of said delayed groups of pulses 35 delay at each circuit and with said same amount
whereby each circuit receives said groups oi.'
less than said dîiïerent amount, and means for
pulses delayed different amounts, also supplying
including or omitting pulses from said transmit
said groups of pulses to said circuits with the
ted group whereby pulse coincidence may be
same amount of delay at each circuit, and ln
made to occur at the desired circuit at the re
cluding or omitting pulses from said transmitted 40 ceiver.
groups whereby pulse coincidence may be made
8. The invention according to claim 7 wherein
lto occur at the desired Acircuit at said remote
said diiîerent time spacing is equal to one-hall'
point.
5. A multiplex system comprising means for
said similar time spacing.
curring pulses having similar time spacing and
curring pulses having similar time spacing fol
„
9. A multiplex system comprising means for
producing a group of time spaced pulses, said 45 producing a group of time spaced pulses, said
group comprising a plurality of successively oc
group comprising a plurality of successively oc
a pair of pulses that have a different time spac
lowed by a pair of pulses that have a different time
ing, means for transmitting said group of pulses
spacing, means for transmitting said group of
to a receiver which includes a delay line, a plu 50 pulses to a receiver which includes a delay line,
rality of circuits each of which is responsive to a
a plurality of circuits each of which is responsive
plurality of coincident pulses, certain of said cir
to a plurality of coincident pulses, certain of said
cuits being connected to evenly time-spaced
circuits _being connected to points along said delay
points along said delay line whereby each of said
line where the delay between said points is the
certain circuits receives said group of pulses de 55 same as said similar time spacing whereby each
layed diiferent amounts, another of said circuits
of said certain circuits receives said group of
being connected to a point on said delay line
where said group of pulses is delayed a diiïerent
amount than said even time spacing, means for
pulses delayed diiferent amounts, another of said circuits being connected to a point near the end
group comprising a plurality of successively oc
the receiver.
10. The invention according to claim 9 wherein
of said delay line where said group of pulses is
also supplying said group of pulses to said circuits 60 delayed by an additional amount equal to said
with the same amount of delay at each circuit,
diiîerent time spacing, means for also supplying
' and means for including or omitting pulses from
said group oi.' pulses to said circuits after the
said transmitted group whereby pulse coinci
pulses have passed through the delay line to a
dence-may be made to occur at the desired cir
point beyond said last-mentioned point, and
cuit at the receiver.
65 means for including or omitting pulses from said
6. A multiplex system comprising means for
transmitted group whereby pulse coincidence
producing a group oi time spaced pulses, said
may be made to occur at the desired circuit at
curring pulses having time spacing therebetween
o! a certain value and a pair‘of pulses that have 70 said different time spacing is equal to one-half
a time spacing of one-half said certain value,
said similar time spacing.
means for transmitting said group of pulses to a
11.'A multiplex system comprising means for
receiver which includes a delay line, a plurality of
producing a group of time spaced pulses, said
circuits each of which is responsive to a plurality
group comprising a plurality of sucoœsively occur
ofcoincidentpulmcertainotsaidcircuitsbeing
75 ling pulses having similar‘time spacing, means
2,403,5e1
for transmitting said group of pulses to a.v re
ceiver which includes a delay line, means for sup
plying Asaid group of pulses to said delay line
whereby they are delayed _as they travel along
said line, a. plurality of circuits each of which is >
responsive to a plurality oi'. coincident pulses,
.said circuits being connected to points along said
delay line where the delay vbetween said. points
is the same as said similar time spacingl whereby
‘ leach of said certain circuits receives said llroup
oi' pulses delayed diilerent amounts, means for
also supplying said group of pulses to said circuits
with the same amount o! delay at each circuit,
and means for including or omitting vpulses from
said transmitted group whereby pulselcoin'cidenoe
may. be made to occur at the desired circuit lt
the receiver.
'
-
lJorim P. sun'rn.
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