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Патент USA US2409231

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15, 1946.
c. H. SMITH, JR., ETAL
I
2,409,229
SELECTOR CIRCUIT
Filed June 13, ‘1945
E
2 Sheets-She'et 1
5
IO
3mm
CARL HARRISON SMITH JR.
MILTON L. KUDER
‘Get. 15, 1946.
c. H. SMITH, JR., ETAL
2,409,229
SELECTOR CIRCUIT
Filed June 15, 1945
2 Sheets-Sheet 2
I LET-E _
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CARL HARRISON SMITH JR.
MILTON L; KUDER
Patented Oct. 15, 1946
2,409,229
UNITED STATES PATENT OFFICE‘
2,409,229
SELECTOR CIRCUIT
Carl Harrison Smith, Jr., Arlington, Va., and
Milton L. Kuder, Washington, D. 0.
Application June 13, 1945, Serial No. 599,287
7 Claims.
(01. 177-380)
(Granted under the act of March 3, 1883, as
1
amended April 30, 1928; 370 0. G. 757)
This invention relates in general to a pulse
transmission system and in particular to a means
According to the invention, a time base gener
ator, which may comprise a delay line energized
by a pulse generator or any'other suitable ar
for producing a group of pulse signals wherein
the number and the relative time occurrence of
the pulse signals comprising the group are selec
rangement as hereinafter described, is provided
tively determined.
In an application ?led May 11, 1945, Serial No.
593,174, by E. H. Krause et al., a pulse transmis
'
I
and arranged to cooperate with a series of pulse
selector vacuum tubes. Associated with each of
the tubes is a separate switching means which
may be operated to effectively withdraw any one
or number of tubes from the series. The vac
sion system is disclosed in which a group of pulse
signals is transmitted over a given time interval. 10
uum tubes and the time base generator are so
The number and the relative time occurrence of
interconnected that when the latter is set into
the pulses comprising the group are made con
operation it functions to successively render con'.
trollable. In this system a time base made up
ducting those tubes left in the series by the
of a number of successive unit time intervals is
switching
apparatus. Connected to the tubes in
generated at the transmitter and comprises a 15
the series, but, not shown for purposes of sim
time pattern from which the group to be trans
mitted is formed.
In any given transmission a
pulse signal is always transmitted coincident with
the ?rst unit time interval in the time base and
at such other unit time intervals as may be de
sired. At the receiving system a second time
base generating device and a series of amplifying
channels are provided and arranged so that each
pli?cation, is a pulse transmitter which is held
under control of the pulse selector tubes and ar-'
ranged to emit a pulse signal each time one of,
the tubes in the series becomes conducting.
With particular reference to Fig. l a detailed
circuit diagram of the invention is shown. As
indicated in the ?gure, the time base generator
comprises a pulse generator l0, and a scale-of
unit time interval generated by the time base de
?ve counter chain, including stages ll,
vice renders a different one of the amplifying
:3. Tubes l4 through l8 represent the pulse se
channels operative. In operation the ?rst pulse
lector
tubes with which the time base generator
received from the transmitter starts the time base
is to operate, while tube 24 is representative of
at the receiver then each pulse signal arriving
a coincidence tube which is connected in com
after the ?rst pulse signal is made to pass through
a different amplifying channel according to its 30 mon to the pulse selector tubes by way of a‘bias
ing tube 23. Also, a pulse transmitter, not shown,
time relationship with respect to the ?rst pulse in
is connected to the output terminal 55. As will
the group. In this manner any given pulse sig
hereinafter be described in detail, the pulse gen
nal occupying a de?nite time position relative
erator ll} may be a multivibrator or any other
to the start of the interval of transmission can
be made to pass through a particular amplifying 35 suitable pulse-generating device, such'as that
channel and can therefore be used to perform a
de?nite function at the receiving system.‘
shown in the aforementioned patent application,
which may be started and stopped either auto
matically or manually, such as by the off-on
switch ‘H, for example. The primary function
It is an object of this invention to provide a
means for producing a group of pulse signals
of this pulse generator is to provide a source for
wherein the number and relative time occurrence 40
driving the counter chain, comprising stages H,
of the pulse signals are selectively determined.
12, and i3, through a complete cycle of operation
It is another object of this invention to pro
and at the same time to provide transmitter key; ‘
vide a means for alternately producing two dis;
ing pulses to the first control grid 35 of the coinci
tinct groups of pulse signals wherein the dispo
dence
tube 24. By-intlerconnection of the control
sition of the pulse signals in each group is selec 45
grid of each of the selector tubes l4 through I 8
tively determined.
'
to predetermined points in the counter chainyas
Other objects and features of the present in
vention will become apparent upon a careful con_
sideration of the following detailed description
hereinafter described in detail and in accordance
with the principles taught in the patent appli
when taken together with the accompanying 50 cation of E. H. Krause Serial No. 582,964, ?led
March 15, 1945, the counter circuit is made to
drawings.
successively render each of the selector tubes
Fig. l is a circuit diagram of one embodiment
conducting, as far as their grids are concerned,
of the invention, and Figs. 2 and 3 show a series
during a cycle ‘of operation. When any of the se
of wave forms illustrative of the operation of the
lector tubes conducts, a voltage drop appears
circuit shown in Fig. 1.
»
'
55 across their common plate load resistance 29.
2,409,229
3
The presence or absence of this voltage drop re
resistance of the second tube llb in the ?rst
counter stage and is applied in parallel through
sults respectively in either non-conduction or
a second short-time-constant circuit similar to
conduction of the biasing tube 23, which by way
capacitance 60 and resistance SI to the second
of its connection to the second control grid 34 of 5 control grids of tubes lie and I2!) of the second
the coincidence tube 24, renders the latter either
counter stage I2. Finally, the input to the last
sensitive or insensitive, respectively, to positive
counter stage I3 is taken from a tap on the plate
voltage pulses applied to its ?rst control grid 35
load resistance of the second tube IZb in the sec
by the pulse generator In. Any one of the selec
ond counter stage and applied in parallel through
tor tubes I4 through I3 can be prevented from go 10 another short-time-constant circuit similar to ca
ing into conduction in response to the action of
pacitance 6i) and resistance 51 to the second con
the counter chain by opening the cathode circuit
trol grids of tubes I3a and I31) of the ?nal counter
of the respective selector tube. Therefore to se
stage I3. As hereinafter described, the quiescent
lectively suppress or produce output pulses at the
or zero state for the counter chain exists when
terminal 55 of the coincidence tube 24, a num 15 tubes I la, I2a, and H51) are conducting and tubes
ber of multi-position switches numbered I9
Ilb, I21), and I3a, are non-conducting. In trac
through 22 are inserted in the respective cathode
ing a complete cycle of counter operation, the ?rst
circuits of the selector tubes I-5 through I8. In
input pulse applied to counter stage II renders
the zero position of these switches the cathode
tubes I'Ib, I21), and I311 conducting and tubes Ila,
circuit is complete to ground and the selector 2O I2a, and l3b non-conducting‘ The second input
tube is capable of conduction in response to the
pulse renders tubes Ila, I21) and I3a conducting.
action of the counter chain. In the No. 3 posi
A third pulse from the pulse generator will render
tion of the switches the cathode circuit is open
tubes III), In and I3a conducting. The fourth
and the corresponding selector tube will be in
input pulse renders Ila, I2a and I3a conducting.
capable of conduction regardless of its grid bias 25 The ?fth negative input pulse would normally
voltage as provided by the counter circuit. Con
render tubes I lb, I21) and I3?) conducting but due
sequently, during any given cycle of counter op
to a feedback pulse obtained from the plate of tube
eration the appearance or absence of a trans
~ I31) and applied through capacitance 58 to the
mitter keying signal at the output terminal 55
suppressor grids‘59 and 63 of tubes Ill) and I21)
depends upon the setting of the cathode switches 30 respectively, the tubes Ila, I2a and I3b will be
l9 through 22.
conducting, and tubes IIb, I21) and I3a non-con
In the typical counter chain shown here all of
ducting. It will be noted that this state is identi
the counter stages II, I2, and I3 are similar in
structure, also the grid biasing resistances and
cal to that which existed when the counter was
in the zero or quiescent state. Thus the counter
plate resistances employed at corresponding 35 chain is of a scale-of-?ve variety.
points in each half of each counter stage are of
In the selector circuit the control grid of each
similar resistive value, resistances 43, 46 similar
tube ‘I4 through I8 is connected to a separate
to 4|, 45 and so on. Therefore for purposes of
junction point I08, 260, 300, 400, and 500. Each
simpli?cation, only the ?rst counter stage II will
be described in detail. In this stage the multi
of these junction points is in turn connected
40 through three separate resistances to the ?rst
grid' tubes Ila and Ill) represent the vacuum
ccntrolgrid of one of the tubes in each of the
tube components of a conventional scale-of-two
counter circuits II, I2 and I3. This connection
counter circuit. The ?rst control grid 38 of tube
is typi?ed at the‘ ?rst junction point I00 by resist
Ila is connected through the shunt combination
ances 41, 48 and 49. In this relation it should be
of resistance 43 and capacitance 44 to the plate 45 noted that all the resistances at each junction
of tube Ilb and also, through the grid return
point are equal in size and are current limiting
resistance 46 to a source of C: potential. Like
in function. At the ?rst junction point I00 cur
wise, the ?rst control grid 39 of tube III) is con
rent limiting resistance 41 is connected to the
nected through the shunt combination of resist
?rst control grid of tube Ila and resistance 48 to
ance'4l and capacitance 42 to the plate of tube 50 the ?rst control grid of tube I2a and the third
I la and also, through the grid return resistance
resistance 49 to the ?rst control grid of tube I3b.
45 to a source of 0: potential. The circuit is
As abovementioned, the ?rst control grid of any
thus made regenerative and only one of the tubes
tube in the counter circuit varies from zero po
will conduct at any instant. To change the con
tential to a potential determined by voltage divi
duction condition of either tube a negative signal
sion across resistances 43, 46 as that tube passes
is applied in parallel to the second control grids 55 from conduction to non-conduction. Thus, when
36 and 31 of both tubes. As the conduction state
the counter is in the zero or quiescent state where
of the circuit changes, the ?rst control grid of the
in the tubes I la, IZa and I3!) are conducting, the
tube passing from conduction to nonconduction
potential at the junction point I00 will be zero
will vary from about zero potential to a negative
and theselector tube M will conduct since its
divider
action
6
potential determined by the voltage
cathode is returned directly to ground. If each
from the positive potential at the plate of III) to
of the resistance connections of the remaining
the negative supply potential across resistances
junction points 200, 300, 400 and 500 are traced
43, 46. The input to the counter circuit as ob
it will be found that in the zero state of the count
tained from the pulse generator IE] is applied in 65 er, a minimum of at least one resistance at each
parallel to the control grids 36 and 31 through
of the other junction points is returned to a
a coupling circuit comprising capacitance 6B and
grid in the counter circuit which is at a nega
resistance 6|.
In one case this circuit may con
‘tive potential. v The minimum negative voltage
stitute a short time-constant compared to the
existing at any one of these junction points due
time duration of the applied pulse and therefore 70 to the voltage divider action of the current limit
functionto, produce an abrupt positive pulse in
ing resistances is therefore at least 1/3 of the nega
response to the positive-going edge of each of the
tive voltage existing at the junction of resistances
applied pulses and an abrupt negative pulse in re
43, 45 when tube llb is conducting. Thus, if
sponse to the negative-going edge of each of the
the negative potential is made large relative to
applied pulses. The input to the second counter 75' the cut-off bias for the selector tubes the grids
circuit I2 is taken-from a tap on the plate load
5
2,409,229
of the remaining tubes in the selector circuit will
be biased below cut-off. Then as the counter cir
cult is driven into its No. 1 state where tubes I lb,
6
comprising capacitance 69 and resistance 6| to
the input of the counter circuit and also through
the short time-constant circuit comprising ca
!2b and 13a are conducting and tubes Ha, l2a
pacitance 60 and resistance 62 to the ?rst control
and I3?) are non-conducting, it will be observed
that the voltage at the junction point 2 08 will now 5 grid 35 of the coincidence tube 24. Waveform b
is the result of the action of the foregoing short
be at zero while the voltage existing at the other
time-constantcircuits and is representative of
junction points I99, 300, 403 and 500 will be suffi
the actual signal voltage applied to the input of
ciently negative to hold the other selector tubes
the counter circuit and to the ?rst control grid
below cutoff. Tube l5 will now be able to conduct
10 35 of the coincidence tube 24. Since the counter
circuit was initially assumed as being in the zero
of the counter circuit tube I6 will be the only
or
quiescent state with the selector tube l4 con
tube in the selector capable of conducting and so
as far as its grid is concerned. In the second state
ducting and therefore with the bias removed from
on down the circuit, each selector tube rendered
capable of conducting in its proper order with 15 the second control grid 35 of the coincidence tube
2:’! and since the ?rst pulse in waveform b is pos
each change in state of the counter circuit.
itive and does not eifect a change in the counter
The coincidence tube 24 is preferably of the
pentagrid type having two control grids 34 and
state, this pulse will appear at the output termi
nal 55 as a negative pulse such as that shown in
35. The ?rst control grid 35 provides a means
by which the pulse signals from the pulse gen 20 waveform c. The next pulse in waveform b is neg
ative and will therefore be blocked from the out
erator Ill may be applied to it, while the second
put terminal 55 of the coincidence tube 24 by
control grid 34 provides a means by which the
the
action of the cathode bias 5‘! but will, how
coincidence tube may be blocked and unblocked,
ever, produce the number one state in the counter
so as to speak, by the joint action of the counter
circuit and the selector circuit to thereby con 25 circuit wherein tubes lib, I21), and l3a are con
ducting and tubes Ila, [2a and I32) are non-con
trollably suppress or produce an output pulse at
ducting.
This action will render the selector tube
the terminal 55. The ?rst control grid 35 is re
I5, as far as its control grid is concerned, con
turned through resistance 62 to the juncture point
of the cathode resistances 32 and 33. As a result
ducting but since its cathode switch I9 was as
sumed adjusted to the No. 3 position its cathode
30 circuit will not be complete and therefore the
sistances, and the cathode bias voltage 57, the
tube will not conduct. In this case, the second
coincidence tube is held unresponsive to negative
control grid 34 of the coincidence tube 24 will be
signals applied to this grid. The second control
biased negative and therefore the second positive
grid 34 is directly connected to the plate of the
biasing ampli?er 23 which in turn is grid driven 35 pulse will not produce an output at the terminal
The second negative pulse operates to produce
from the common plate load resistance 29 of the
the
second
state in the counter circuit with tube
selector tubes. During the time when all of the
i6 conducting as far as its grid is concerned and
selector tubes are non-conducting, the grid of
since this is one of the tubes whose cathode switch
tube 23 will rise above cathode potential until lim
iting by resistance 29 occurs. This results in 40 20 was set in the zero position, the tube will con
duct and the bias will be removed from the sec
heavy conduction by the biasing tube 23 produc
ond control grid 34 of the coincidence tube with
ing a large voltage drop across its plate load re
the result that the third positive pulse causes
sistance. The plate potential of tube 23 willthen
conduction by tube 24 producing, with negligible
become only slightly higher than the positive
delay, a negative pulse at the output terminal 55.
cathode potential 56. This latter potential is
made some suitable value less than the cathode 45 Thus the combined actions of the counter circuit
and the selector circuit operate to produce at the
potential 5? on the coincidence tube so that in
output terminal 55 a pulse group formation such
this condition the bias on the second control grid
of the voltage dividing action of these two re
as that shown by waveform c. In this case the
34 is such as to hold the coincidence tube blocked
?rst, third and fourth pulses were produced at
or non-conducting regardless of the signal ap
the output terminal 55 while the second and ?fth
plied to the ?rst control grid 35. When, how 50 were
suppressed.
ever, any one of the selector tubes becomes con
‘From the foregoing it was seen that whether
ducting, a voltage drop appears across their com
or not a pulse appears at the output terminal
mon plate load resistance 29. This drop is suf?
55 and is therefore transmitted depends upon the
cient to bias tube 23 beyond cut-off potential.
The plate voltage of this tube then rises to its 55 setting of the cathode switch arrangement in the
selector circuit. In some instances it may be de
plate supply voltage 64. This supply voltage is
sired to transmit for a given interval of time
made equal to the cathode bias voltage 51 of
one group of pulse signals and then to transmit
the coincidence tube and the second control grid
for another interval of time a second group of
36 of the latter is therefore possessed with zero
bias and the coincidence tube is ready to respond 60 Pulse signals having a different formation. To
accomplish the foregoing, a multivibrator com
to any positive signal applied to its ?rst control
prising tubes 25 and 26 and a pair of diodes 2‘!
grid 35.
and 28 are disposed within the cathode circuits
For purposes of illustration assume that the
of the selector tubes and are arranged so as to
cathode switches 26 and 21 in the selector tubes
53 and i 3‘ are set in the zero position while 65 produce cathode switching in a predetermined
manner. The multivibrator is preferably a sym
switches 59 and 22 in the selector tubes 15 and
metrical free-running type having a period much
#8 are set in the No. 3 position. With this as
longer than the time required to make several
sumption and the further assumption that the
successive transmissions during the conduction
counter circuit is initially in its zero or quiescent 70 period by either of the tubes. When tube 25 is
state, the circuit will now be described with refer
conducting, tube 26 will be non-conducting. Dur
ence to the wave forms shown in Fig. 2. Wave
ing this time the voltage at the plate of tube
form a is representative of the output signal from
25 will be near that of its cathode which is biased
the pulse generator Hi. This output wave is ap
negative as indicated at 18, while the plate of
plied in parallel to the short time-constant circuit 75 the non-conducting tube will be substantially 3+.
2,409,229
As arranged, the cathodes of the associated di
odes 2‘! and 28 are connected through the re
spective current limiting resistances 30 and 3!
to the plates of tubes 28 and‘ 25. Thus when
tube 26 is conducting its plate potentia1 is nearly
that of source 10 which is su?iciently negative
to permit conduction by the associated diode 21.
At the same instant tube 25 is non-conducting
so that its plate potential will be at B+ with the
result that the associated diode 28 is also held
non-conducting. The diode that conducts ap
pears essentially as a short circuit to ground while
the non-conducting diode appears as an open
8
tain amount of time delay is inherent in the
operation of the selector tubes. This delay is
primarily due to the large resistances employed
at 41, 48 and. 49 and other similar positions which
impose a ?nite time delay when charging or dis
charging the stray capacitances associated with
these points. In addition this delay may be ac
centuated by actually inserting physical capaci
tances at these points. Therefore this invention
is not to be limited to the embodiment shown ex
cept insofar as is necessitated by the spirit of
the prior art and the scope of the appended
claims.
The invention described herein may be manu
circuit. Thus by Connecting the cathode, for
factured and used by or for the Government of
15
example, of diode 2"! to all the Number 1 posi
the United States of America for governmental
tions in parallel of the switches 5% through 22,
purposes without the payment of any royalties
and the cathode of diode 23 in parallel to all
thereon or therefor.
the No. 2 positions in the switches, the multi
What is claimed is:
vibrator action can make the No. 1 and 2 po
sitions of the switches appear alternately as open
and closed circuits respectively.
1. A means for producing a group of pulses
wherein the number and relative time occurrence
of the pulse signals in said group are selectively
determined, comprising a means generating a
time base which is comprised of a ?nite number
With reference to the waveforms shown in
Fig. 3 the operation of the circuit including the
action of the multivibrator and the associated
of voltage pulses, each of which is predeterminate
diodes 21' and 28 will now be described. In Fig. 3, 25 ly spaced in time, a plurality of vacuum tubes,
waveform a is representative of the alternating
means associating each of said tubes with said
positive and negative voltage pulses obtained from
the pulse generator ill and applied in parallel to
both the counter circuit and the coincidence tube
24. For purposes of illustration let it be assumed
that the cathode switch 22 is set in the #2 po
sition and the remaining cathode switches i9, 25
and 2i are set in the #1 position and that tube
25 in the multivibrator circuit is conducting.
During this condition diode ‘28 appears as a short
circuit and all the #2 positions in the switches
l9 through 22 appear at ground while diode 2'1
and consequently all the Number 1 positions in
the switch appear as an open circuit.
In this
?rst named means in such a manner as to be
successively rendered conducting thereby, sep
arate means associated with each of said tubes
and arranged to render any one or number of said
tubes unresponsive to the action of said ?rst
named means, a coincidence tube, means con
necting the output from said ?rst named means
to said coincidence tube, and means connecting
said coincidence tube in common with said plu
rality of tubes in such a manner that the pulse
output from said ?rst named means will appear
at the output of said coincidence tube only dur
ing the time when one of said plurality of tubes
is conducting.
case only the ?rst pulse and the ?ith pulse will
be transmitted as represented by waveform I).
2. A means for producing a group of pulses
Then, after a given number of such transmissions
wherein the number and relative time occurrence
the multivibrator changes states wherein tube 25
of the pulse signals in said group are selectively
is conducting and tube 25 is non-conducting.
determined, comprising a means generating a
During this time diode 21 will conduct and the 45 time base which is comprised of a ?nite number
of voltage pulses each of which is predetermin
#1 terminals in the cathode switches will be sub
stantially at ground potential while all the Num
ately spaced in time, a plurality of vacuum tubes,
ber 2 positions appear as open circuits. The
means associating each of said tubes with said
resulting transmission is that shown by Wave
?rst named means in such a manner as to be
form 0. In this case the ?rst, second, third and 50 successively rendered conducting thereby, sepa
fourth pulses produce transmission, the ?fth pulse
rate switching means associated with each of
is suppressed.
Although we have shown and described the use
of a scalc-of-?ve circuit as a time base genera
tor it must be understood that if a counter cir
cult is to be used, one of a larger scale and a
selector circuit having a correspondingly larger
number of tubes may be employed without de~
parting from the spirit of the invention. It is
also to be understood that selection switches may
be inserted in all of the selector tubes rather
said tubes and arranged to render any one or
number of said tubes unresponsive to the action
of said ?rst named means, a coincidence tube,
means feeding the output from said ?rst named
means to said coincidence tube, and means con
necting said coincidence tube in common with
said plurality of tubes in such a manner that the
pulse output from said ?rst named means will
appear at the output of said coincidence tube only
during the time when one of said plurality of
than all except the ?rst tube as shown in the
tubes is conducting.
3. A means for producing a group of pulses
speci?c embodiment. Furthermore, it is not nec
essary to restrict the operation to a pulse gen
wherein the number and the relative time occur
erator providing alternate peaked positive and 65 rence of the pulse signals in the group are selec
negative pulses to the counter circuit and the co
tively determined, comprising a plurality of the
incidence tube 24. For example, a series of pulses
scale-of-two type of counter stages connected in
of negative polarity may be used to trip the
cascade so as to form a scale-of-N counter cir
counter circuit while an inverter tube can sup
cuit, a plurality of vacuum tubes each of which
ply positive pulses to the second control grid 3%‘: 70 is connected to said counter circuit in such a
of the coincidence tube 24 or the negative pulses
manner as to be successively rendered conducting
may be applied directly to the cathode of tube
thereby as said counter circuit passes through a
2d. Despite the fact that the counter pulses and
cycle of operation, separate switching means con
the transmitter keying pulses occur simultane~
nected to each of said tubes for rendering any
cusly the system is still operative because a cer 75
9
2,409,229
one or number of said tubes unresponsive to the
10
generator to said coincidence tube, and means
connecting said coincidence tube in common with
action of said counter circuit, a pulse generator
arranged to produce a series of voltage pulses,
said plurality of tubes in such a manner that the
means applying the output of said pulse gener
pulse output from said pulse generator will appear
ator to said counter circuit, a coincidence tube, 01 at the output of said coincidence tube only during
means also applying the output from said pulse
the time when one of said plurality of tubes is
generator to said coincidence tube, and means
conducting.
connecting said coincidence tube in common with
said plurality of tubes in such a. manner that the
6. A means for alternately producing two dis
tinct groups of pulses wherein the number and
pulse output from said pulse generator will 10 the relative time occurrence of the pulse signals
appear at the output of said coincidence tube only
in each group are selectively determined, com
during the time when one of said plurality of
prising a plurality of the scale-of-two type of
tubes is conducting.
counter stages connected in cascade so as to form
4. A means for producing a group of pulses
wherein the number and the relative time occur
rence of the pulse signals in the group are selec
tively determined, comprising a plurality of the
scale-of-two type of counter stages connected in
cascade so as to form a scale-of-N counter cir
cuit, a plurality of vacuum tubes each of which
is connected to said counter circuit in such a
manner as to be successively rendered conducting
thereby as said counter circuit passes through a
a scale-of-N counter circuit, a plurality of vac
uum tubes each of which is connected to said
counter circuit in such a manner as to be suc
cessively rendered conducting thereby as said
counter circuit passes through a cycle of opera
tion, an electronic switching means, said switch
ing means alternating back and forth between
two electrical states, separate manual switching
means connected to each of said selector tubes
and to said electronic switching means, said man
cycle of operation, separate switching means con
ual switching means being arranged so that a
nected to each of said tubes for rendering any
?rst group of said tubes becomes unresponsive to
one or number of said tubes unresponsive to the
the action of said counter circuit during one elec
action of said counter circuit, a pulse generator
trical state of said electronic switch and a second
arranged to produce a series of voltage pulses,
group of said tubes becomes unresponsive to said
means applying the output of said pulse gener
counter circuit during the second electrical state
ator to said counter circuit, a Coincidence tube 30 of said electronic switch, a pulse generator
having at least two control electrodes, means ap
arranged to produce a series of voltage pulses,
plying the output from said pulse generator to
means applying the output of said pulse gener
one of said control electrodes in said coincidence
ator to said counter circuit, a coincidence tube
tube, and means connecting the other control
having at least two control electrodes, means
electrode of said coincidence tube in common to
applying the output from said pulse generator to
said plurality of tubes in such a manner that the
one of said control electrodes in said coincidence
pulse output from said pulse generator will appear
tube, and means connecting the other control
at the out-put of said coincidence tube only dur
electrode in common to said plurality of tubes in
ing the time when one of said plurality of tubes
such a manner that the pulse output from said
is conducting.
40 pulse generator will only appear at the output of
5. A means for alternately producing two dis
said coincidence tube during the time when one
tinct groups of pulses wherein the number and
of said plurality of tubes is conducting.
’
the relative time occurrence of the pulse signals
'7. A means for producing a group of pulses
in each group are selectively determined, com
wherein the number and relative time occurrence
prising a plurality of the scale-of-two type of
of the pulse signals in said group are selectively
counter stages connected in cascade so as to form
determined, comprising a means generating a
a scale-of-N counter circuit, a plurality of vac
time base which is comprised of a ?nite number
uum tubes each of which is connected to said
of voltage pulses each of which is predetermin
counter circuit in such a manner as to be suc~
ately spaced in time, a plurality of vacuum tubes,
cessively rendered conducting thereby as said
counter means interconnecting each of said tubes
counter circuit passes through a cycle of opera
to said ?rst named means whereby each of said
tion, an electronic switching means, said switch
tubes is caused to be successively rendered con
ing means alternating back and forth between
ducting as said counter means is driven through
two electrical states, separate manual switching
a cycle of operation, separate switching means
means connected to each of said tubes and to said 1' associated with each of said tubes and arranged
electronic switching means, said manual switch
to render any one or number of said tubes unre
ing means being arranged so that a ?rst group of
sponsive to the action of said ?rst named means,
said tubes becomes unresponsive to the action of
a coincidence tube, means feeding the output
said counter circuit during one electrical state of
from said ?rst named means to said coincidence
said electronic switch and a second group of said 60 tube, and means connecting said coincidence tube
tubes becomes unresponsive to the action of said
in common with said plurality of tubes in such a
counter circuit‘ during the second electrical state
manner that the pulse output from said ?rst
of said electronic switch, a pulse generator
named means will appear at the output of said
arranged to produce a series of voltage pulses,
coincidence tube only during the time when one
means applying the output from said pulse gen
of said plurality of tubes is conducting.
erator to said counter circuit, a coincidence tube,
means also applying the output from said pulse
65
CARL HARRISON SMITH, JR.
MILTON L. KUDER.
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