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Патент USA US2406096

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Aug. 20, 1946.
M. MoRRlsoN »
2 4»0 6v 0» 9, 6
- Fuga dst. 2:5, 1943
_2 Sheets-Sheep 1
Àug.~ 20,1946.' l
* «
‘l -
` 2,406,096
b' „c
Filed oct. 25.1943- "
*a Shepfcs-sneet 2
F/////Y ,If/Ä f ~
W/ ~7//
order be furnished with an accuracy upto one
the fundamental frequency of multi-vibrator 2,
part in one million, for frequencies within the
Y this lag in phase
position in gettingstarted can
not exceed 10% of the half-period value, as will
` be understood by those skilled in the art.
lower rlaudio range.
The frequency of source I
will be setv at, forV the present embodiment, a fre
quency of 472.5 cycles per second. The `useful
ness of this value in the’ present embodiment will
The means of, and method for, closing cathode
'I onto lead 9 by the employment of gaseous triode
8 willV be hereinafter pointed out.
It is Well known in the art that the ability of>
be hereinafter pointed out.
The circuit enclosed within the dotted area 2
represents a1 multi-Vibrator circuit Well known in
the art, y'andi thefïconstantffrequency source I
injects asynchronirzing'voltage into the `multi
`multi-,vvibrator circuitsVA to maintain an invariable
procedure in operation depends upon al1 parame
ters of the multi-vibrator circuit being main
vibrator circuit, which, as is well known ¿in Y,the
tained. constant, including the circuits loadingV
art, will, under proper conditions, ñX thefre
, quency of the multi-vibrator circuit ata definite I15V the said multi-Vibrator.
sub-multiple of the frequencyof source I.
l ’ In the'present invention, it is desirable to not
Multi-vibrator 2 is constructed tooperate atav4 " only maintain an unvarying performance in the
sub-multiple frequency of the frequency ofv source, “~ multi-vibrator circuit, but its wave-form is de
I, represented by the 21st
sub-multiple thereof, sirably-maintained under varying conditions of
which means an operating
mental frequency represented
frequency for--mu1ti-~" '
vibrator 2,V of 22.5 cycles pe-r second for the funda
by a 'dot anda
This means;Á that :the vconstant frequency y '
2, .
' iwhich >means that there are Y 10.5 constant-fre
Y »fluency-source cycles for each half-cycle of the
grammatically inthe dotted area I 3, which forms
a; highly >practicalarrangement.'V 'ÍTwol'tubes VI4
and I5 ," l'i'aw'ev` the control grids thereof connectedY
f source operates at 'thea21’st harmonic yof the fun
i, ed'amental j- :frequencyj of the
This may be accomplished in one
>ofl several way , one of which is illustrated dia
Y respectively'to; the'fplates of V«tubes @and 4, and
l. 'fthe plate'sof tubes 'I4 'andVV I 5A are connected to
gether and thence connected to the load'center
I6 of the multi-Vibrator circuit‘2. This arrange
ment provides suñîcient grid plate bias 'voltage
'of themulti-vibrator 2 will be hereinafter pointed f‘ ‘fromvmulti-vibrator circuit 2 to cutoff plate cur
rent in> tubes I4 and I5 in the presence of multi
vibrator operation.
f . Y ¿The multi-vibrator circuit is provided with two
Those skilled in theV art appreciate that in mul
z '_“tub'es, 3 Vand 4, and this‘lmulti-vibrator circuit 1
` ti-vibrator operation the Voltage is developed
i -‘ .differs from the `cornmonform of multi-vibrator
ñrst between lead-s I I and point I E, with substan
î L circuit only necessarily in 'respect to the cathode
_ " grid circuit of tube
tially no Voltage between point I 6 and lead I2,
4, which is »provided with a
K'._» 4 >multi-vibrator. `
The usefulness of> this 10.5 cycle ,. Y
A constant frequency source'ratio to one-half‘cycle ' '
- 1. resistor 6 connected'to the cathode 'I and to the '
-plate of thè'gaseous
triode 8, having its cathode
connected to ground-lead Y9.. The ohmic value
i of resistor 6 is too high to permit the circuit en
i >¿closed within the area 2, to function as a multi
- ' vibrator, when the plate current ofV tube 4 is
' Alimited by said resistor, and said resistor has sub
35 for one half-period of operation of multi-vibra
tor 2, and the conditions are reversed for ,the
’- other half-period of operation; that is, voltages
develop between'lead I2gand point* I6 with sub
stantially no voltage betweenlead I I »and point I6.
. Y Under this condition of operation,ïtubes I4 and
I 5, under the potential» of plate battery'I'Land
a properly closed circuit, produce in the load I8
s'tantially the same effect as an-open circuit be
tween cathode ‘I and‘ground-lead 9, but Ysaid re
an accurate 'replica ofthe voltage wave-form pro
"sistor is-low enough to prevent the potentiall dif
ference between said cathode' and said ground
' lead, ,from drifting to different and indeñnite
\ values, when multi-Vibrator-2, is not oscillating.
pp. :il duced by multi-'vibrator 2 and without distortion.
Y Since the operation of` tubes I4 andAIS-is such
that no appreciable load is taken from multi
~' ~vibrator 2, under any condition of operation of
these tubes, that is, whether plate current is pres- '
¿ yWhen gaseous triode 8 is in anon-conducting `
state, the cathode 1~is` substantially in effect y Vent or not in said tubes, theA shapeì of the grid
control voltage of these said tubes, will follow
disconnected from ’ theA ground-lead >9,V under
' .fthe shape of the voltage, in the multi-vibrator
» if .which conditions only the‘resistor 6 is interposed
between cathode 'I andground-lead 9,y and said ' j circuit 2 always, and Lif’and when the tube cir
y»cuits I4 and I'5 are properly closed, the plate
currents of said tubes willassume so-called square
resistor being suñìciently high to produce in effect
» cut-'off of theV plate l'current inr tube 4, so that
under these’conditions tubey 4 is conducting no- ï r
current trand tube’3 is ’conducting the normal
’f «1» amount of current for the plate
voltage employed
~ -~ under normal multi-vibrator operation.
t If source I is under proper operationand cath
-ï 4odef‘l isl connected to ground-lead 9, the multi
' - vibrator 2 will start into operation instantly, pro
Yducing a'fundamental
II ‘andv I2Y of 22,5 cycles'per second withv a fun
' ` ¿ vdamental frequency kaccuracy determined by the
` i‘jaccuracyjof the sourcel and with a phase lag -V
' ~ -behind the'finstant V‘of
closing' ofv cathode 'I onto
lead ‘9A of ja' maximum
not to' exceed 10% of the*
' wave-forms.
Tubes I4v'and: I5», beinga push-pull
circuit, or in eifectïthe reverse of this which may
’ be referred to as a pull-'push circuit, the Wave
form in load resistor I8 is, ofcourse, a rectifica
tion‘of the wave-form in multi-vibrator 2 and,
GO therefore, always has _a positive or always a nega
" tive outline, as the case may zbe._V
",With multi-vibrator _2 in operation, the Iform of
» _the voltage acrossload resistor I8, which repre
sentsït'he form of vVoltage across the output cir- - '
cuit of the repeater and' so designated ir? Fig. 1,
‘ will’follow the rectiñed outline of the lobes of
multi-vibrator;'L_7 only whenjthe cathode circuits
- -‘half-period of fthe frequency of the multi-vibratorY
of tubes I4 and-- I5 are closed forv an entire half
2,; since the multi-vibrator '2 will lock in with4
‘ -period of operation of the- multi-vibrator'circuit.
„The circuit enclosed in dotted2 area I9 repre
the ñrst >lobe of `the `frequency source having the È
proper Vpolarity for synchronization and this can- , " Asents one means `of closing the circuits o'f tubes
,I4 and I5‘referred to above, and this means com
not lne-more than the `time represented yby one
~ cycle lof the 'frequencyvsourcel.l
prises gaseous triodes 20 and 2| so connected into
_Y Since
10'.'5„cycles'of¢`source r>I Ífor=asingle'half-period of < 75» the
cathode circuits of tubes I4 _and I5, as-to
closev thesesaid cathode circuits' when the said
ffi 1 '2,406,096
¿ ~ jneferring'to Figa-curve B, time is assumed to l l
‘ have progressed from the zero position to the in
stant a when the input voltage, Fig. '1, fhas re- ,
duced the bias Voltage value of tubesß and 20
Vsulìiciently to permit' ofV
gaseousì conduction in
these tubes upon the appearanceofthe operating ì
The value ofthe resistance of Iìvis too high to
as such, but is suñîcientto’insurea definite plate,
" 'and
are effectively
two a,
the cathodes
to the>
~of tubes
in operation
4 vand 259y
live units, in other cases more thanrñve units.
’ A -detailed operation of the device for the re
generation of the character D, shown ln graph
A, after _transmission with distortion into form
shown in graph B, will- now be set forth.
The distorted signal wave-form of _the outline
permit the two multi-vibrator circuits to operate
voltage across the‘tube kIi ’and‘therefore at the
Yamount to fewer units, inÍ somecases less than
shown in graph B is to >be received through the
Fig. 1. Previousvto the
>reception of any character signal current, normal
line current is flowi g through the input resistor
3I'. Tubes 20 and 2 I, are both in a non-conduct
' Y‘input circuit identified in
jing electricalstate, due to their previous `history
operation and to> the grid bias»` supplied by
producing. the wave-forms for whichV they are 15 lof
resistor 3 I.
constructed. Frequency source I, being in oper
ation, multi-vibrator 2 locks in With'it, not more
due likewise, to theV grid bias supplied byjresistor
Y than 10 % of a single dot> period behind the phase
3|. Under this-condition, the plate circuits vof
instant a, and multi-'vibrator 2 continuesin op
eration as long as the cathode 'I is effectivelyv 20 tubes 4 and 25 are substantially open-circuited
andtubes 3 and 2B are conducting their normal
connected to the ground-lead 9. `
plate currents. Under these conditions, the plate
Y Referring to Fig.`2`, curveC represents the volt
current of tube 26Vservesrno operatively useful
1 V,age output of multi-vibrator 2 and afrectiñca- '
function. The `plate current of tube 3,’ through
. tion -of "this curveY represents the line output'
‘ voltage which may be biased if and when desired, 25 its associated plate resistor, provides plate cur
rent cutolï bias for tube I4, which rmaintains
tube I4 in an electrically non-conducting state.
The absence of plate current in tube¿4 causes
»an absence of grid bias in tube I5, but in Vview
asindicated by the connection at point 29, Fig. V1.
It will be appreciated that the plate voltage
impressed upon tube 8 by multi-vibrator circuit
' 2 is only present for each .certain half` cycle
thereof Yand means is provided for maintaining 30 of Vtube 2I having been left in an electrically non
conducting state, the circuit ofV battery I 'I,Y
gaseous conductionin'this tube for the neces
through tube 2|, through tube I5 Vand through
à sary duration of the operation cycle. This is ac
resistor IB, is effectively open. Likewise the cir
complished by multi-vibrator 24, the wave-form
cuit of battery I'I, through tube 20, through tube
of which is indicated by curve D, Fig. 2, and
I4 and through resistor I 8, is effectively Open.
which provides plate current for tube 8 for the ‘
Normal output line current is supplied by bias
three half cycles of six units of the repeater
provided by battery I1. Thus with a normal
operation during whí-chtube 4 is idle and allows
steady current in the input circuit, a normal
tube 8 to >be restored to its non-conducting status
steady current is repeated in the output circuit.
at the ends of the code cycle.
_ V
This status corresponds tothe zero time position
Referring to Fig. 2, reduction of voltage in
40 of the curve shown in graph B.
curve B, between the time intervals a-b, oper
ates to utilize the lobe of multi-vibrator 2 curve
C for that period, to produce the line currentV
curve E during the same period. There being no
reduction in line voltage for the period b-c for
the curve B, the multi-vibrator lobe for that
period. curve C produces no line voltage, as shown
in curve E.
Fig. 1, is in continuous operation and is con
tinuously‘supplying small amounts of grid volt
age Ato tubes 3 and 4, sufficient to Ycause this
multi-vibrator to lock in, when once started into
operation, but insuflicient to cause any opera
tional manifestation in the absence of an elec
c-e `curve B, two consecutive lobes of the multi
vibrator shown along curve C is caused'to pro
duce two unitsfof line signalcurrent Yfor that
trically conducting state in tube 8.
If une biasis used, «the signals shown amg ,
curve E can be restored to the equivalent closed
circuit form indicated along curvefF, asis fully
understoodfby those skilled in the art. . . „ "
, VVThe curve 'along abscissa A is Yassumed to be> „
sent out at a conventional nrate of A60 words per GO
minute which lixes combined frequency of a dot
and a space at 22.5 cycles per second, making
`the dot or marking- period >equal to-,afhalf Va
period of the multi-vibrator 2.
The penodof'mruu-vibrator 24 ,is fsughuy lessl
t than: 7.42 units, >or'less V.than .the distance a-h,
ras shown along curve D, Fig. 2, one lobe having
The constant frequency source, illustrated in
, lasts Yfor two units as'indicated between the lines
Y 1
“ an, electrically conducting state.
In the case Where the reduction in line voltage
period, as shown along curve E.
When the signal. wave shown in graph B ar
rives at the time position a, the grid bias of tube
8 is lowered, due 15o the reduction vin signal cur
rent. to a value which causes tube 8 to acquire
Since tube 3 has been carryingV its normal
plate current, multi-vibrator 2 is therefore in a
condition to start its normal operation immedi-`
ately upon completing the multi-vibrator circuit,
by causing tube 8 to `become electrically con
It may be well to mention at this point, .that
properly designed multi-vibrators, unlike capac
itor-reactor oscillators, are set into normal oper
ation under conditions set forth above, instan
taneously with .the establishment of the normal
circuit thereof; so that at the instant that tube
8 forms a closedis circuit
set into
2, an-d
it locks in with the-constant frequency source at
six units of duration, as illustrated ybythe curve
the iirstV half cycle of the proper'polarity that
for thev embodiment herein given. vThe'length-of
>duration of. the long lobe of curve D depends 70 coincides withV the'V normal grid voltage >of the
said multi-vibrator, as is well vunderstood in the '
upon the use to which itis to be put- in the par Y Vart
relating to this apparatus.
ticular system incorporating' the invention. In a
continuous distributor system Vemploying a ñve
Tube 26 of multi-vibrator 2,4 was conducting
Y' plate current simultaneously with {tube 3 of
unit code, the duration of the 1ong 'lobe wouId 75
multi-vibrator 2, andtube 25- was ina non
thus regenerating` forfthemperiodeàdfb'h;
-tl-ier„spacingïsignal..@father` ,
¿meramente egërgstatustf . ¿»»cï'lrdinglyìè¿as@fshovvn`
4Q; soÍ thatfull-ren@tu-heißl
-2 »and 24,» were fcorresponding period in graph 1B:t ~
When ‘ìtheaïsignal current Vofi-»graplrr- ¿.B vrhas
instantaneouslyset into- normal cperaticn.~ ~
Multi-vihraterl „l producesawoltage wave-form. - 5
in accordance-¿Wittig graph-»1G so vlo'ng -as »the -tube 8f ï verses . rilciiarity»gint accordance uli-the grama-»6,
accordance@is electrically¿conducting-s and, likewise,- multi- - _
vibratorr~ ».4 ï produces
'a - wave-form
accordance ¿
necessary» cutoff -«voltage~fòr~. the
with graphA D nse@` long- A«as- tube » /8 @remains in? -an - .
electrically.@conducting ¿» state; f The; - function - of «,lQ
«f The reve salqcietheïpolaritybf~the »voltage o
«multi-vibrator Í,2 cuts-oir.' the’plate/current fof' tube,r
electrically f conducting
»7_2 ¿lì ¿is » to state'.= maintain
for -« jatubeA
1 8 f- in» ¿offw
approximately» =six~ half» cycles -ofll »_»multi-vibratorV f
¿~.I4, extinguishes¿¿the«ionization»in
stops the'iflow of current fromfbattjery I_` ,
2, by -maintaining«current"throughtube»8, for` t «resistor
I8 in the circuitfincludingotubes;’I¿4»'and'
the periods .fof- time-«during» whichl ytube ‘Y
' '
- 20. Atathisfinstantfthm disappearanceçcfmplat
passing- plate current; namely, during everyfothery »
current-«in- ,-tube- -4 .allows-¿tube I Efto.ä become f‘elec
half cycle', and îthen*permitting¿tube'8 to fbe-*f
come electrically nonTconducti-ng;¢bywremoving» «
‘ :trically @conducting»andfimpresses voltage » ïupon-f.
2-I»;-~but«sinceïthe gridz»bi~asffof»tube ZIffhas
the plate* current ,caused bylfmultif-vibrator; 24 ï --‘f tube
risen above the cutoff value for the normal;»plateV
at the end of this period, since at thisy instantie(),Si voltage'no current flows through resistcrçlßrln
of time, there isïfno »plate- _current-1in :tube 4-1-tov
circuit including--tubesn-Zßgand ,Ii-*forthe next
maintainelectricalvconductivity»in tube 8 eitherw ` ff'the
fhalf period hoiîethepV multi-‘vibratorf-îgç. ' hence-:_ ,ltheî
In other» Words, v»at-the end.y of «six »half .cycles of ‘
output 'circuit fre-turns to t its` 1normalî :currentfdue
operationf of<`multi-vibratorv-2 and at »the rends "of:y v4to
biasgf as«--previous1yqldescribed an ¿ascii-lusL
the same duration. -offtime' in nmulti-vibrator 24;v
there is~r1ol lcurrent availableV from 'either fmul-ti'
vibratory «to» maintain `«',electricalfy conductivity` «win-wV
Sei-n ïana'elec
trically '-corrductingg; stateyinnthe fabs‘encei- of‘aplate
tube 8 Jand'ltherefore- fboth = multi-'vibrators'1 are I f
r`"current-fin` tube e4; during'the-»2ndel 4thfza`nd~6th
returned @t0-1.. thef initial‘ inoperativeestatus j de
' 'half cycles 1of operation "fof «multi-_vibrator-YÍZ ,îzas
scribed ffor-îthemn «These
been‘previously'describedr'r»1f f-fi`v g '
operation for: these >multi-vibrators;V isßperfo‘rmedfl ' ’has
‘ WhenA the.' timeV instant cç» graph Bpis: reached
each -and every time ftubefßfh'as` Tits 'biasfreduc'e'dr4 f the previoulsî'statu'sêofi operati‘o’rris ïexa'ctlyfae 'de'- .
suflicientlyf y-tci cause itj to- assume-“an electrical#
conducting.A .fist-ate, Vwhether this-`v bias».L persists f~
throughthefperiod':ofpperationsorfnct.j rThat i‘ .
to say,=-«onef« initial rremoval-v' of v“biasrfironr tube'feß E
will cause aïcomplete; cyclev toA ëbev performed `'b
multi-vibratorlv?, ffin-y accordance ¿With/'graph C
and simultaneouslyçr aßcomplete` cyclecperforme
by multi-vibrator~2 g' in'accordancef with" grapheDr‘
This may bevlikenedto Athe release.y of =a-zstart~stop
rotary regenerativef repeater, .fthe half" îcycles’K of.V
graph’vther timing ï of? VAsix` 'of 1
the segments“~andA --the nflengthf foi'fîwaveefemur-'13.;7
correspond-ing '"tor-.on'e- '-conipletef‘rotation» ‘orf'the'f »
sught -fphase shiftsl 'between @the input anaffthe
output- 3circuit-»fare ' :ignored‘fsin'fthisz description _
since theyîcaniîbe hmade' asrsmalr» asldesirable'rfand‘i
may berconstant-.ffor anyrprop'er
tem employingitr?sfinvention; .
‘with that described
Return’í 'now' `tto» ëth'e Y`"signal
graph >`Beat*therltime finstant".a;f:«tube"8
24 start-into operationfin accordanceîwitlr'graphs.”
C and D_-fif‘f i
The instr ti that)v tube? 81"- sets therr multi-vie »
brators "into operation-grobe 4 ‘dravvs‘fnornialfplate
currentyiproducingç:due: tof its l'plateiir'e'’sistorä suf-~
ñcient. 'grid‘chia‘sc-for*v
The plate current of tube 4 is repre
sented byîítlië'îsëñrstéîfha'ltlïcyclëlofà’graph C, and
'he succeedingfaairïßcycièïf
scribedï‘b‘eginhingfàlt the time instant ufr-11d co`_
timingY themen ‘thefftimef period ¿ «1t-9b ’ff rnc
We have' the'ï'distortédïmignal jcurrént ‘_"for ÀAthe
period> 'of-six"halficyclesfrom ¿a'to' "y, ‘graphfB,
regenerated'îjnt‘ö‘ the forni "shownf in graph“ A" for,"
the saine' period ¿criÁ time;'Howeve?ídcring' the<
electrically conducting condition and this con
under conditions of multi-vibrator operation, the
~ tinued up to the time instant indicated by g in
-plate current of tube 3 ceases. With the ces
sation of plate current in tube 3, tube I4 has its Go the graphs, and at this instant multi-vibrator 24~
plate-grid bias removed, and Idue to the reduc
reverses its polarity and tube 25 ’ceases to supply
tion in signal current at the instant a in graph
`conduction current for tube 8, and in the absence
B, the plate voltage applied to tube 28 by the
of conduction current in tube 4, both -multi
removal of grid bias from tube I4, produces plate
current in resistor I8 of aWave-forrn correspond-` 70 vibrator circuits are returned to their initial
-starting conditions. Thus, a complete cycle of
ing to the ñrst half cycle in graph C. The volt
operation of the device for the letter d has been
age drop across resistor I8, due to said plate
traversed.' In the general case, the periodfof the
current in the said resistor, produces the Wave
multi-vibrator 24 is slightly less than the sum
form shown in'graph E, for the period a-b, and 75 of the complete number of units in the code
this voltage reduces the output bias voltage ac
'Í used and as illustrated in graph D, which pre- __
` VVvents thepossibility ofv overlappingV of signals.`
In the -claims hereumîler>
pulse oi _one polarity andonellongimpulse o_f op
'l Y posite polarity,said longimpulse having a period.’ *n I '
Where theV number of _'
-equal substantially tothe length `of the sum of all
«à _units
_of anequal-unit-'code
defined by thèïsense'
is referredv
to, itis*
lthe character code-units employed _insaid code
-1 employed and 'is dependent upon> whether j the «5 two
and circuits
means coordinatingA
electrically` couplingsaid~-`
said periods.
_ number'of `units is odd or even. In a start-stop” _` `
ï systeimsix units are
4required to >print’a char?
' 4. In an apparatus
for regenerating
inan equal-unitcurrents“Y '
_ " _representing
signal characters
' acter, though the Acycle of operation requires 7Í42` ’ ~
code telegraphgsystem over an outgoing line from
t units.
Y In 'a continuous distributor system, ñve
fl() signal currents received over an incomingïlineÍ
_ Y
‘ _
f units are required to print a character, but in _
comprising,_a`n input circuit to receive'code’sig'nals ` " '
the case of
ing in”ïmu`lti4vibrïator
_ an odd number
may- >releasey
any> 'time77H » at random combinations, one electronic regenera-`> j if
-between ’the jend‘o'f the. ’fourth unit andthe ‘end ‘^ ’ > _tive
tojthe »lengthof
circuit havinga
a single unity
of _saidperiod-`
code, "f
lof theflfth unit,v and so forth, aslwill be under’ l5 ‘a second electronic- switching circuit having ¿a ï
l stood by those"V skilled in
ïjñswitching period equal in lglf‘l‘gthv Substantially to. _. v. ,
that of all the character code-units combined, á,¿ Y
Squareewaves are defined r`to ’be tliejcommon
lform foundin so'-called
" '
oscillator to :control thè-period of the"
` Having fdes'cribed oneembodiln'ent of ’theùin-IN "sinusoidal
first said~"sv‘vit<’:hir`1'gjcircuit,V and means electrically
_vention,` the scope thereof is`set`forthv inÍ the` 20 coupling said
two switching
' j
ï «f
‘claims hereunder.
saidperioçis. ‘_
1. In" an apparati'is `for"»reg'enerating signal 'curé -'
Y ’ïrents in anfequal-lunit-code’ telegraphsystemgan
` input 'circuit'adapt'ed to'receive distorted ~signal"____
y '
circuits coordinating?, _ ï ~
5. Injan apparatus'for regenerating currents l _
representing signal charactersl in _an 'equaleunit-l "
code telegraph
system over an outgoing line from_ - ' ` '
¿5 signal currents received over an incoming' line '
~ currents in‘aîïcode of equaleunits'at?random'com_-_ " comprising,
an input circuit to _receive c'ode- signals ` ‘
binations, two electricallyY associated 4multi-vif
]brator circuits, 'an'output
` " Vat random combinations,lone -electronicregenera-` v
.means electri'` _ " tive switching means to nx the'period of the dura-4 '
L lcally associated,withlsaid’output circuit for ñ'irin'gv
>of a single unit of said code, a second'elec'-V
under operation by vsaidrrandom 'combinations the ¿6" vtion
tronic 'switching means to ñx'the number of uni/ts
period" of , duration jof ' each of >said units in 'said
employed in said code in a single operation ther‘e- 'i
output‘circuit by the half-period'length of 'one ofv _ "15 of,
and a ïsinusoidal- oscillator VtoV control the ipe# _ "
said electronic multi-vibrator circuits, and means
for l'ixing the period ofthe sum of the> total said
unitsfof asingle operation in' said óutputcircuit
f riod of the first said switching means; '
6. In an ’ apparatus for
electronic multi-vibrator circuits."rv , „
i code telegraph system over an'outgoing liine from` '
'i signal currents received over an incoming-line* `
‘ comprising, an input circuit to receive code sig- _ v "
2.`In an apparatus forr'regenerating currents
representing'sig'nal characters in an equal-unit
code telegraph Ysystem over an outgoing line from
signal ` currents;` received over an `"incoming 'line
comprising, y-a'n‘input' circuit to receive‘code sig# i
regenerating currents ’
representing signal’ characters-'inv an equal-unite ~
by the whole-'period lengthv of the other of said‘
' „nals at random- combinations, _one "electronic
_ _
to provide output'currents
¿op square-wave generator
1 of regenerated signal-wave-forms, a second elec
j tronic square-wave generator to` determine theV
nals atirandom combinations, one electronic oscil--
_latoryfcircuit havingla period equal' to twice that p« ` ' cycle of operation of said system, and‘electronic-g:
itube means- electrically coupling said two genera- ’
' of aV single unit length of‘said code to regenerate
the period of’theunitsj of said signals; a second »43 Vtors coordinating said output currents of 'regen-Y>
signal-wave-forms with said cycleï’of op- j "
electronic ‘oscillatory circuit having' a period equal « j Lerated
substantiallyV to the length of the sum-»of all the
units and fractions thereof in the code employed
Y to regenerate the period of a'complete code-chate
,i 17. In an apparatus forregeneratin'g currentsïßv
. Vrepresenting signal 'characters in an equal-unit# .'
,code telegraph system overan outgoing line `from’_ ' i: " ‘
acter operation, and'means electrically‘coupling ‘50
' -signal
currents -received over yan ‘incoming line
said two- oscillatory circuits coordinating said14V
periods. v f
3. Infan» >apparatus 'for regenerating currents A
representing signal characters in anequal-unit
code telegraph system over an ‘outgoing line from'
signal.. currents , received ' over an> incoming - linen
comprising, an input circuit to receive code signals
_ comprising,
an input circuit to receive code signalsk '
combinations, one' squar'eèwave alter
_hating-current velectronic generator to provideV
currents of regenerated signal-'wave-r
Yforms, oneA electronic means .responsive to ’dis-'
torted input line currents providing signal tim
atlrandom combinations-one electronic oscillatory -- Y Y ing for said output currents, and a second square
_ wave alternating-current electronic generator
circuit Vhaving a period @quai to. twice that of' a
cooperating 'electrically with,A iirst said generator
_singleunit length of said code to regeneratethe
determining the -cycle Íofv operation of said'system.V
period of the units of saidvsignals, aisecond elec- _
tronicv oscillatory circuit Vhaving _ _one vshort im
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