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Патент USA US2406813

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‘sepf.3,1946.
u
’
-
L. A. DÉ ROSA
.
2,406,813
INTELLIGENCE TRAÑSMISSION 4SYSTEMFiled June 18, 1943
5I Sheets-Sheet 2
f6
4.47
` 4.29
202
L58
140 20g
f7
INVENTOR.
¿ou/s A. pf?’os/l
Sept. 3, 1946.
--
`
L. A. DE4 -RosA
2,406,813
INTELLIGENCE TRANSMISSION SYSTEM
A_n
Il Il
-
l
IN VEN TOR.
LOU/6’ _ A. 11e-R054
BY
Armin/EY
Patented Sept. 3, 1946
2,405,813
‘UNIT-eo STATES «PATENT lorrlce
’INTELLIGENCE TRANSMISSIÜN SYSTEM
Louis
de Rosa, West Brighton, >Staten Island,
N. Y., assignor to Federal Telephone and Radio
Corporation, Newark ,v N. J., a corporation oi'
Delaware
Application June 18, 1943, `Serial No. 491,287
10 Claims.
.l
This invention relates to .improvements in in
telligence transmission systems, and more par
(o1. `rise-3o)
'
2
subjoined detail description of one embodiment
and a modiiication thereof, illustrated in the
ticularly 4to systems in which intelligence is trans
accompanying drawings, in which:
mitted in the form Vof pulses, and lreceived and
Fig. 1 is a 'block circuit diagram of a preferred
converted into visual intelligence,
5 ¿form oi signal-transmitting apparatus according
Systems have `been heretofore proposed in
to the present invention; y
`
which intelligence in the form of pulses or a
Fig. 2 is a partial detailed circuit diagram of
series of pulses is transmitted »directly or Toy-car
some of the control elements shown in ’block form
rier Wave tc a receiver where such 4pulses vare
in Fie. i;
converted into visual intelligenceeither by means 10
Fig. .3 is a .circuit diagram, partially in block
of controlling the pattern on the screen of a
form, illustrating an intelligence receiving and
.cathode ray tube Yor `by »impressions upon a mov
converting system adapted to be used with the
ing tape. In `som-e systems y»the characterxto be
transmitting system illustrated in Figs. 1 and 2;
transmitted is Ádivided `-up-` into »several transverse
Fig. 4 shows examples of intelligence `in ’the
bands _such as ñve for seven, of several >groups 15 form of letters and numerals of the> type which
of »pulses each, the-number
position oi pulses
in each band fdeterm-ininglthe formation of the
transmitted character. The 'pulses «may be sent
will be reproduced by ythe >syst-_em `illustrated in
Figs. 1. 2 andß; and
Fig. 5 is a partial detailed circuit diagram of
at -a common frequency, or, it iis sometimes y.adaY modified form „of signal-transmitting appa
vautageous to transmit each bandl of :pulses at 20 ratus.
different frequencies.
`
_
The general arrangement of ya preferred form
In all such systems the
»interval between
of .intelligence determining and transmitting
pulses or sets of pulses >is -determinative of the
system according to the .present invention is i1
character to "be reproduced' at the receiver, and
lustrated in _»Fig. V1. Such .a system may include
various means have «been _proposed to produce 25 a suitable keyboard :lo which itself may .be made
sets of such timed'pulses in .accordance with the
of Well-known construction, the ,keys of which
characteristics Yof lthe intelligence ‘to be trans
will have indicia »marked thereon vcorresponding
mitteil, such as ¿a letter or numeral. In prior
to the character of signal .to be transmitted. A
systems it
`been usual to ypra-form mechan
sequence of timed ?pulses will be obtained from
>ical patterns which, through the 4use of light
tbeelectronic counter circuit l2 and, in accord
resconsive ~`tubes >or similar 'glneans form series of
ance with the particular :key depressedon the
pulses `corresponding1to the letter ‘to be transmit
ted, the pattern chosen being controlled by a
keyboard Lor :similar means. Such systems and
such means vare described, .for example, in the
copending app-licationsfof 'Edmond M, Deloraine,
S. N. 415,554 .filed October
11941'ra-nd Edmond
M. Deloraine, `et al., S. N; 469,056 ‘iiled 'December
l5, 1942.
.
It is one of the objects ci ‘the‘ipresent inven
tion to eliminate the .use oi mechanical devices
`previously necessary in .nroducing the timed
pulses used .as a basis lor 'the iormaticnof char
acter-identifying signals.
‘
keyboard l0, these pulses -Will be directed to actu
ate one rci’ the gate rtubes 22a, 22h, .230, 2211,2.29I
221° and 22g, .there being seven `of these gate tubes
if, for example, the system isa seven band »sys
tem. -Each of the gate `tubes is respectively en
ergized by oscillators 24a, 24e, 24o, 24d,.24e, .24Je
and 24g, _operating at diiîerent .frequencies :f1 to
f7 respectively. In the preferred `form of system
illustrated, the gate .tubes .22a to 22g inclusive
‘ Y are -connected .throughacommon outputlead to
control the modulation vof a vtfansmitter 25 sup
plied from. 4a `carrier source .28.v In the case `of
.a wire transmission system, as contrasted to a
>Another object of my ‘invention is directed "to -45 radio transmission system, the outputs of `the
ward >the use .of 4an electronic counter circuit :for
gate tubes could 1be conducted »through .a trans
deriving sequentially timed Àpulses in an intelli
mission line 'to> a receiver in -a Jmanner obvious
gence transmissionßsystern.
A further objectof this invention is to provide
an electronic >counter 4circuit for: deriving se
o_uentially` timed `pulses 4in an intelligence trans
mission system, :together ‘with ¿controllable means
to those skilled inthis art.
`
In Fig. 2 v1 have illustrated details of 4aupre
50 ferred form v»of electronic counter circuit, `and
»the lmanner »in which such counter circuit is in
terconnected with the various gatetubes through
for startiugzand stopping Said _counter circuit.
switches operated by vthe .keys of keyboard Ill.
These and other featureacapabilities and ,-ad
The electronic counter ycircuit @|22 may, -for eX
"vantages ofthe invention Will‘fap‘pear .from the 55 ample, 4comprise seven gaseous Vdischarge tubes
2,406,813
3
4
able isolating resistors or resistors banks 20a to
20g inclusive. Since the gate tube 22h at fre
the other, in a manner known to the art that
quency f2, should operate only during the first
after the first tube |4a is fired it will energize the
period, closure of the switch 40h energizes the
second tube |41) which, in turn, will extinguish
grid of gate tube 22h by completing a circuit be
the tube |4a and energize the next tube |4c. A
tween conductors 58 and 60, the conductor 58 be
counter circuit of this type is disclosed, for ex
ing
interconnected with an isolating resistor in
ample, in the U. S. patent to Shumard 2,146,862,
the bank 20a, of tube |4a through conductors
issued February 14, 1939. Thus, the tubes be
62 and 64a. Likewise the switch 40e completes a
come conductive and non-conductive sequentially
circuit between conductors 65 and 68, thereby
down the line until the last tube |4g is energized.
connecting the energized conductor 62 with the
To extinguish the tube 14g, I provide an addi
grid of gate tube 22c. Since the gate tube 22d is
tional gaseous discharge tube |411l which becomes
to operate at frequency f4 for periods 1 to 4 in
conductive after the tube |4g and which will
clusive, the switch 40d will complete a circuit
then extinguish the latter. The tube |471. will
between conductors 10 and 12 which intercon
become extinguished automatically after a pre
nect the grid of the gate tube 22d to the outputs
determined period of time through the resist
of the ñrst four tubes of the counter circuit. It
ance-capacitance network I6, connected between
will be noted in this case that the conductor '|
the cathode of the tube |411, and ground. Out
is connected to the common conductor 14 which,
put leads |8a to |8g inclusive, are respectively
connected to the cathodes of the tubes |4a to 20 in turn, connects to conductors 16a, 1Gb, '|60 and
16d, attached through isolating resistors to the
|4g inclusive, and as the tubes become sequen
respective output leads |8a, |817, |8c and |8d.
tially conductive, a pulse will appear on each
Gate tubes 22a and 22j producing pulsed energy
output lead, the pulse on one output lead being
at frequencies f5 and f6 are again required to be
timed with respect to the pulse appearing on
energized
only during the period of conduction
the output lead of the prior tube. The electronic
of the first tube of the counter circuit. Thus,
counter circuit may be started by providing a
the closure of switch 40e interconnects the com
short pulse on a grid of the first tube |4a. For
mon conductor 62 of the ñrst gaseous discharge
this purpose a switch 30 may be provided on each
tube through conductors 18 and 80 to the gate
of the keyboard keys 38. When any key is de
pressed the switch 30 is momentarily closed and, 30 tubes of 22e while closure of switch 40j completes
a circuit from common conductor 62 through con
through leads 32 and 34 will momentarily ener
ductors 82 and 84 to the grid of tube 221‘. For
gize the grid of the tube |4a from a source 0f
the letter chosen, the gate tube 22g will operate
power 38. Other means for energizing the grid
over the entire band at frequency f" as did gate
of a gaseous discharge tube and known to the
tube 22a at frequency f1. Thus, closure of switch
art may, of course be used.
40g completes a circuit from the common con
For the purpose of illustrating the formation
ductor 56 through conductors 86 and 88 to the
of character-identifying signals by means of the
grid of gate tube f".
present invention, I have shown in Fig. 2 three
|4a to |4g inclusive, so interconnected one with
keys which, upon being depressed will transmit
pulses of such a character as to form upon the
>screen of a cathode ray tube the letter “E,” the
numeral “2” and the letter "N.” Each key 38
in addition to the electronic counter circuit start
ing switch 30, may include a plurality of switch
ing means for interconnecting the outputs of the 45
gaseous discharge tubes |4a to |49 inclusive to
the control circuits of the gate tubes 22a to 22g
inclusive. For example, if the key corresponding
to the letter “E” is depressed the counter cir
cuit |2 is initiated into action by the momentary 50
closure of the switch 30 and at the same time
control circuits are established through switches
48a, 48h, 40o, 48d, 40e, 40j and 48g. An example
of Fig. 4 (A) shows that in the formation of the
letter “E” a continuous pulse, or continuous series 55
. of pulses over the entire transmitting band is
necessary to form the upper portion of the letter
at frequency f1; for frequencies f2 and f3 a pulse
need be sent only over the first period; for fre
quency f4 pulses are sent over the first four 60
periods; at frequencies f5 and f6 pulses are again
only sent during the first period, and for fre
quency f7 pulses are again transmitted during
Similar switching means are used for other
characters in a manner similar to that just de
scribed, the manner of arrangement of contacts
varying of course, upon the type of letter to be
transmitted. In connection with the formation
of numeral “2” as illustrated in Fig. 4 (B) the
control circuits will differ considerably from those
used in making the letter ‘EJ’ For example, at
frequency f1 the gate tube 22a will be energized
for periods 2 to 6 inclusive and the switch 42a will,
upon its closure and through conductors 9S and
92 connect the outputs of tubes |8b to |8f in
clusive on the grid of this gate tube through con
ductors 90, 92, common conductor 94 and in
dividual conductors 86h to 96e, these latter con
ductors being isolated from other conductors go
ing to the same output leads through other re
sistors of the resistor banks 2Gb to 20e. In cer
tain instances as for example, for frequency f2
for the numeral “2,” the gate tube must be twice
energized and de-energized, for example, it must
be energized during the first period, and again
for the fifth, sixth and seventh periods. To effect
such a control of the gate tube 22h, closure of
the switch 42h establishes two circuits to the
common conductor |00 through the conductors 98
the entire band. Thus, since the gate tube 22a
provides a signal at frequency f1 this gate tube 65 and |02. The conductor 98 can be connected to
the common lead 62 which will be the same
must be energized for the entire band. Accord
one as used, for example, for energizing the gate
ingly, the switch 48a connects the outputs of
every one of the gaseous discharge tubes to the
grid of the gate tube 22a by completing a circuit
tubes at frequencies f2, f3, f5 and f6 in connection
with the formation of the letter “E.”
The sec
It will be seen 70 ond conductor |02, however, will be attached
through common lead |04 to the individual leads
that conductor 50 is connected to conductors 54a,
between conductors 50 and 52.
54h, 54e, 54d, 54e, 54j and 54g through common
conductor 56. The conductors 54a to 54g inclu
sive are respectively connected to the gaseous dis
charge tube output leads |8a to |89 through suit
|088, |06’f, and |069 to the output leads |86, lßf,
and |89, respectively, through suitable isolating
resistors in resistance banks 20e, 20j, and 20g.
Closure of switches 42C, 42d, 42e, 42f, 42g and 42h
_
"Will ¿effect îthe c‘losure of :proper «circuits for `the
igat'e tubíesìtzc to§2-2gîinclusive Áto form the desired
pulses for ‘the .remaining ¿frequencies ‘1’3 to f7
J inclusive.
The various circuits 'may be traced in
.the manner given above. For example, 4closure
:of switch 132e establishes .energization ~of Athis
tube from gaseous discharge tubes `>Nid and hic
through output leads ltd and we, individual con
ductors Hdd and `-Hde, common conductor ||2
and conductors ~.|-U8 and |10; closure ’of switch Ilî‘fd
establishes energieation'of gate tube 22d -from -gas
dischargetubes `Mc and Md throughfoutput leads
of, ‘for example, V310,000 cycles applied to the verti
lcal vbeam-scann-ing plates. These two `scanning
Asources zwill, therefore, fcomb'ine 'to Amove the
.beamfof ‘the .cathode ray tube slowly across the
fface A-of .the kscreen lbut rapidly ‘up and down. A
phaser 29B Fmay 'be yused to control the oscillator
12&6 :so that the _picture .of the 4received character
'may =be properly positioned ion the >screen Vof the
lßcand ltd, individual conductors |200 and 1206i,
common .conductor .H3
and conductors Ilfi
and ,11.8. Gate .tube 22e will zbe energized
from _gaseous discharge .tubes llib and idc
Vcathode nay‘tube. The high frequency generator
through output 'leads l8b and |80, individ
ual conductors
‘6
iode .ray beam may :be `controlled `from .an 'oscil
lator 12815 ‘which through a 4clipper 288, a diiïer
entiator '2&0 .and :generator 292, supplies a saw
»t'o‘oth :Wave of, for example, 30 cycles tothe hori
'zontal lplates >o'i‘ the rcathode ray tube. The dif
tferentiator‘lâlß `may valso key `a second oscillator
.2394 controlling 'assaw-tooth wave Agenerator `296
>2.8.6 »may‘alsobe :used to control a reactance tube
.2.12 ‘connected 'across the ‘tuned circuit V21|] for
themuiïpose #of :scanning this 'tuned circuit at a
|2811` and |.28c, common con
ductor |26 and conductors |22 and |24. The
energization of gate tube 22f .by the gaseous dis
frequency #corresponding Yto the `frequency of‘ the
vertical scanning -wave Aof :the cathode ray tube.
ïllhus, `wher-1 signals on 'frequency bands fl yto f7
:are simultaneousiy received, the circuit 210 will
lbe :seguenti-ahy tuned #over ythis »frequency vband
¿at :an 4«exft-merriely rapid «rate corresponding to the
verticalscanning frequency -of the cathode ray
tube '2184. .Throughthe control tube 274 and the
trigger «cincuit 276, the «control grid »282 will only
charge tubes bia and -`| 4b may be Ysimilarlytraced
'from Aoutput -leads |8a and |31), individual con
ductors 135e and |3021, common conductor '| 34 and
conductors `|3iland |32. Since the gate tube 22g
at frequency f7 is energized over the entire band,
closure ‘o‘f the switch '42g may, through conductors
|38 `and |40 establish a circuit from the common
conductor 5.6 for 'all o1" 'the gaseous discharge
tubes to the grid‘of this :gate tube.
permit a signal on the screen when ra signal at
i The restabli‘sl'iin'g vorf `circuits fto 'form the letter 30 Athe frequency which is ybeing instantaneously
.‘.‘«N” need not >be examined 'in y.detail but can ‘be
`scanned
being received. Thus, as the hori
traced in the manner set forth above. Upon
closure ‘of ith-e various vswitches ¿Hic ‘to 44g in
clusi've, taken in »connection ‘with conductors |42,
~zontal scanning >of .the cathode ray tube `moves
relativelyrslowly across ~the screen, the .grid 2-82
will yproduce -on the screen -a pattern >built >up
.of .a seriesof short partial-pulses Whose horizontal
lßöe, |88, |90, |92, lâdysislâ, lrä‘ßf," 198g, `2MB, '262
~.eratcr .Sil .and lWhose vertical position lis deter
.position is .determined by the .low `frequency gen
and 204. .Attention isdirected-to ythe fact, how
mined by .the high frequency .generator .295 .and
ever, .that -in the formation fof ’a ycharacter ‘such
which, idue to .rapid scanning .of ithe tuning cir
as the letter “N," 'it »may be necessary >vto 'start 40 cuit ‘2F50 will, furthermore, .only appear when .a
.and .stop the «gate 'tube «three times as, :for :eX
`signal is at .a predetermined .frequency .and vat .a
ample, the gate -tube .22o at :frequency ‘,7‘3. This
time correlated with the .position of ythe Vertical
merely requires `-a still »further «contact ‘on the
Y.scanning -Wave.
_
switch 44e .as will »be readily :appa-rent iffromethe
.In cases where thesignal .is not to be .repro
drawings. Similar .switches are fused at 4521
duced .on a .cathode ray tube, it .may be unneces
and 44e.
‘
sary .to ,provide means for ~scanning the .tuning
Since, in accordance with .the mannerfof trans
.even though all of the frequencies are received
mitting the pulsed character-determining ifea
simultaneously. This will be true, for example,
tures by .means .of .the circuits »illustrated in Figs.
1 and.2,.eachfrequency-band maybe fcdepending ,
upon .the form .of the character) simultaneously
energized vand simultaneously transmitted 'if 'the
.signalsare to .be converted into `visual intelli
if the signals are to be .reproduced upon a Inov
'ing tape. `In such .a case it will be merely neces
sary to apply the output trom a broad handre
ce'iver 'through corresponding filters, .ampliiiers
and recti?iers toindividual relays operating pen
gence by .means of Aa 'cathode ray tube, the ~receiver must be .provided .with means :for control
ling the scanning <of Vsucha.tubezfor-»the‘purpose A
cils or other .marking devices. Such a system >is
more :fully .disclosed .and described in the afore
V_described “Deloraine and .de Rosa cbpending ap
of separating the signals on'zthe diiierent fire
quencies. .An .example `of an arrangement for
receiving and convertingsuch signals into visual
intelligence upon .thescreen ofacathoderay-tube
is illustrated in Fis. 3. This .system .forms .no
_part of the present invention but isY covered .in
`the copending application'of Edmond M. Delo-V
raine and Louis A. de Rosa, S. N. 489,760 "filed
plication.
.
In the counter .circuit illustrated in Fig. 2, pro
vision was made for .stopping the operation of
60
circuit automatically, after one series opera
tion. It is _possible that a mere single transmis
sion o‘f the signal would be insuñìcient to produce
‘a ,proper image on .the .screen of a cathode` ray
` tube. and for this reason _it ’may be desirable >to
June 5, 1943. >This ‘receiver includes a suitable (D C.~ _providea counter circuit whereby each letter will
"broad >band receiving apparatus 268 having a
"tuning circuit "Z'I'B‘tunable over the range of fre
quency y‘l-j" of the transmitter. The output
from this tunable circuit '273 controls `the grid
of a gas filled tube 214 from Whose anode _and
‘cathode are derived control potentials ‘for a trig
ger circuit ‘216 consisting of a ,pair of _pentodes
278, 28'0._ The `output of. one of the pentodes 2.1.8
-is connected to the control grid 282 of the cath.
oderay tube 284. Horizontal .travel of .the cath#
be repeated .several times. A modiñcation of the
coiniter circuit indicated at |.2’ in Fig, 5 will be
satisfactory jfor ‘this purpose. .The .counter cir
'c it itself, in this case, .is substantially identical
Withfthat ’illustrated in Fig. 2 except that here
the last .tubefl'lih is connected .back .to the first
.tube Malin thesarne manner fas .each .tube is con
nected to .the nextsucceeding vtube .so that as a
nesult, .when @nce-.energized »the circuit Will ncon
75 tinue =t0 .operate unless ,positive .-‘means are _pro
2,406,813
7
8
which are opeated when any one of the charac
thereof, it is to be understood that it may be
embodied in other forms without departing from
the principles thereof. Accordingly, it is to be
understood that this description is made only
ter-forming keys is depressed. Upon depression
by way of example and not as a limitation on the
vided for stopping it. In order to control the
starting and stopping of the counter circuitI l2',
I have also shown in Fig. 5 modified switches 30'
scope of my invention as set forth in the objects
of any key, the switches 30’ will interconnect the
and the accompanying claims.
lead 2li] attached to the grid resistor for tube
I claim:
Ma to ground. This connection is momentary
l. In a system for the transmission and recep
but is sufñcient to reduce the negative bias on
the grid of this first tube to start the same oper 10 tion of intelligence, the combination of an elec
tronic counter circuit including a plurality of
ating and thus initiate the entire electronic coun
sequentially firing gaseous discharge tubes, means
ter circuit. In the ñnal position of a key 38,
deriving a series of sequentially timed pulses from
the switch 3B’ closes a second contact which con
said gaseous discharge tubes, a corresponding plu
nects the cathode of the last tube lllh and the
grid of the first tube MU, to ground through a 15 rality of normally non-conductive gate tubes, an
condenser 296, via conductor 208. The effect of
actuating circuit for each gate tube, a separate
this connection is to permit several rotations of
energy source for each gate tube, the frequency
the counter circuit, during which time a poten
of each source being different, transmitting
tial is gradually built up on the condenser 206
means connected to the outputs of said gate
which will ñnally be suñlcient to extinguish the 20 tubes, means for starting and stopping said elec
last tube Mh and simultaneously prevent the first
tronic counter circuit. switching means respec
tube Ida from firing. The rate at which this po
tively interconnecting the outputs of said gaseous
tential builds up can be controlled as desired,
discharge tubes to the actuating circuits of said
but will preferably be such as to permitl several,
gate tubes to apply the sequentially timed pulses
(as ten) revolutions of the counter circuit before
thereto in accordance with the intelligence-signi
the same is stopped. Thus, each letter will be
fying signals desired, and a receiver, said re
repeated several times and a clear picture of
ceiver including means converting the received
the same on the screen of a cathode ray tube in
pulsed signals into intelligencethe receiver is assured.
2. The combination according to claim 1, in
Certain details of construction which will be
which said switching means comprises a key
obvious to those skilled in this art have not been
board lnrovided with a plurality of control keys
minutely described since they themselves are not
each having indicia thereon corresponding to a
considered to form any part of the present inven
character to be transmitted, and switches inter
tion. For example, the _details of the keyboard
mediate the outputs of said gaseous discharge
l (l have not been illustrated. This keyboard may
embody the features of usual keyboards known to
the art in which, for example, the depression of
one key automatically releases a key already de
pressed so that special releasing means for each
tubes and the actuating circuits of said gate
tubes operated, by said keys.
f
3. The combination according to claim l., in
which said switching means comprises a key
board provided with a pluralityr of control keys
key are not necessary. Of course, additional
each having indicia thereon corresponding to a
means will be provided for releasing a depressed
character to be transmitted, and switches inter
key without pressing some other character-form
mediate the outputs of said gaseous discharge
ing key. While I have illustrated in Figs. 2 and
tubes and the actuating circuits of said gate
5, the addition of separate switch means for
each key to start or start and stop the respective 45 tubes, operated by said keys, and in which said
starting means includes an additional switch
electronic counter circuits, it will be understood
actuated by each key, connected to the grid cir
that such a separate switch may be in the form
cuit
of the ñrst tube, and means controlled by
of a separately actuated key, if desired. Fur
said additional switches tor momentarily in
thermore, while I have illustrated as an example
of lthis invention a keyboard in which the keys 50 creasing the grid potential of said ñrst tube.
4. A system for producing intelligence-signify
directly operate switches for interconnecting the
ing
signals comprising, in combination, an elec
output of the electronic counter circuits with
the various gate tubes, it will be understood by ~ tronic counter circuit including a plurality of
sequentially firing gaseous discharge tubes,
those skilled in this art that individual keys may
ectuate relays for accomplishing this indirectly 55 means deriving a series of sequentially timed
pulses from said gaseous discharge tubes, a cor
instead of directly, The form of switch mecha
responding plurality oi' normally non-conductive
nism illustrated has only been given by way of
gate tubes and an actuating circuit for cach gate
example and it is not intended thatl this inven
tube,
a separate energy source for each gate
tion be limited to any particular type of key-oper
60 tube, the frequency of each source being differ
ated switch mechanism.
ent, transmitting means connected to the out
No means have been illustrated for definitely
puts of said gate tubes, means for starting and
synchronizing the receiver with the transmitter
stopping said electronic counter circuit, and
systems above described. Such synchronization
switching means respectively interconnecting the
is not necessary in most cases and the mere ad
outputs of said gaseous discharge tubes to the
justment of the scanning voltage by a phaser as
actuating circuits of said gate tubes to apply the
described to bring the picture of the character
sequentially timed pulses thereto in accordance
to the center of the screen is usually suñìcient.
However, if positive synchronization is desired,
with the intelligence-signifying signals desired.
this may be effected by the transmission and re
5. The combination according to claim 4, in
ception of an additional synchronizing pulse in 70 which said switching means comprises a key
board provided with a plurality of control keys
the manner known to the art. Such synchroniz
each having indicia thereon corresponding to a
ing pulse might, for example, be derived from
the additional tube of the trigger circuit.
character to be transmitted, and switches inter
mediate the outputs of said gaseous discharge
While I have shown and described one embodi
tubes and said gate tubes operated by said keys.
ment of the invention and one modiñcation
2,406,813
6. The combination according to claim 4, in
which said switching means comprises a key
10
charge tube interconnecting the last tube of said
electronic counter circuit with the ñrst tube
board provided with a plurality of control keys
thereof, whereby said counter circuit will oper
each having indicia thereon corresponding to a
character to be transmitted, and switches inter in ate in a continuously rotating fashion, and
wherein said starting and stopping means in
media-te the outputs of said gaseous discharge
tubes and said gate tubes operated by said keys, ` cludes a condenser and a ground, means con
necting the grid of the ñrst tube to the ground
and in which said starting means includes an
for
reducing the grid bias thereon and render
additional switch actuated by each key, con
said ñrst tube conductive, and means for con
nected to the grid circuit of the iirst tube, and
necting the grid of the lirst tube and cathode
means controlled by said additional switches for
of said additional tube to ground through said
momentarily increasing the grid potential of
condenser to build up sufficient potential on said
said ñrst tube.
condenser after a number of cycles of operation
7. The combination according to claim 4, in
which the means for stopping said electronic l. to extinguish said additional tube without re
energizing the grid of said first tube, whereby
counter circuit comprises an additional gaseous
said counter circuit will cease to operate.
discharge tube for extinguishing the last tube of
said counter circuit, and a condenser-resistor
leakage circuit connected to the cathode of said
additional tube for extinguishing the same a pre- »z
determined time after it has been energized, and
in which said starting “circuit includes means for
temporarily increasing the grid potential on the
ñrst tube of the counter circuit.
8. ’I'he combination according to claim 4, in
which said switching means comprises a key
board provided with a plurality of control keys
each having indicia thereon corresponding to a
character to be transmitted, and switches inter
mediate the outputs of said gaseous discharge -
tubes and said gate tubes, operated by said keys,
in which said starting means includes an addi
tional switch actuated by each key, connected to
the grid circuit of `the ñrst tube and means con
trolled by said additional switches for momen
tarily increasing the grid potential of said iirst
tube, and in which said stopping means com
prises an .additional gaseous discharge tube for
extinguishing the' last tube of said counter cir
cuit and a condenser-resistor leakage circuit
connected to the cathode of said additional tube
for extinguishing same a predetermined time
after it has been energized.
.
9. The combination according to claim 4, in
combination with an additional gaseous dis
10. The combination according to claim 4, in
combination with an additional gaseousr dis
charge tube interconnecting the last tube of said
electronic counter circuit with the first tube
thereof, whereby said counter circuit will oper
ate in a continuously rotating fashion, in which
said switching means comprises a keyboard pro
vided with a plurality of control keys each hav
ing indicia thereon corresponding to a character
to be transmitted, and switches intermediate the
outputs of said gaseous discharge tubes and said
gate tubes, and in which said starting and stop
ping means includes a condenser, a ground, a
negative grid bias on said ñrst tube, an addi
tional switch operated by each key, and conduc
tors interconnecting each of said additional
switches to said ground, said condenser, and the
grid of said I-lrst tube and the cathode of said
additional tube, so that when a key is depressed
each switch first, momentarily connects the grid
of said first tube to ground for removing the grid
bias therefrom to start the counter circuit op
erating, and then in the final depressed position
each switch connects the grid of the first tube
and the cathode of the" additional tube to ground
through said condenser to cut oiT the additional
tube without starting the first tube after a num
ber of cycles of operation of the counter circuit.
LOUIS A. DE ROSA.
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