1,687,063
Oct. 9, 1928. H. J. J. M. - DE R. DE BELLESCIZE
ELECTRIC SIGNALING
Filed Dec. 24, 1924
‘L. 535 %
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INVENTOR
HEN!“ .J.M.de RIJELLESCIZE
BY 51
M Qa/au,
A
ml:
1,687,063.
Patented Oct. 9, 1928.
UNITED ‘STATES; PATENT OFFICE.’
HENRI JEAN JOSEPH MARIEIDE REGNAULD' m». BELLEs'cIzE, or PARIS, FRANCE. ‘
, ELECTRIC SIGNALING.
Application ?led December 24, 1924, serial‘no. 757,783, and in‘ France December 28', 1923.
My invention ‘relates to electric signaling comprises the primary coil'of coupling de
and particularly to electric signaling systems vice 7 , the modulation generators and the
and methods.
v
.
plate battery B’ allvconnected'in series as
One of the principal objects of my inven shown. The filaments of triodes T3 and T1
5
tion is the provision of an electric signaling are energized from the common battery A’,
system ‘for the reception of radio signals in ‘ the currents in the said ?laments being inde~
which the; ratio of signal strength to static pendently controlled by‘means of adjustable
strength is substantially increased.
" ' ‘
rheostats 1'.
.'
'
,
61)
.
Further objects and advantages of my in— - The secondary coils of‘ coupling devices
vention will be apparent from the following 6 and 7 are connected in, series ‘across the
description taken in conjunction with the signal receiver and detector as shown.‘ .
accompanying drawings in which :—
The variable condenser -8 is", connected
‘Fig. 1 is a schematic diagram of a pre'— across the terminals of the secondary coil
ferred modi?cation of vmy invention.
of the coupling device St
I
, Fig. 2 is an illustrated diagram of a static
disturbance.
'
r
'
Referring to Fig. 1, the antenna circuit
comprises an antenna 1 and a primary coil
20
25
of a coupling device 2 connected‘ in. series
and grounded at G as shown.
Oneo'f the terminals of the secondary coil
of coupling device 2 is connected to both the
grid elements of triodes T1 and T2‘ as shown.
The other terminal of the secondary coil is
connected to the ?laments ‘of triodes T1
The local circuit, comprising the sec-.
ondary coilQof coupling device It and con-v
denser 5, istuned to the signalfrequency ‘by
means of the condenser 5; while, the local
circuit, comprising the secondary coil ‘of
coupling device 6 and variable condensers,
is tuned preferably to ‘the signal frequency
plus the frequency of the modulating'gen-'
orator S [by means of the variable‘ con;v
denser
8.
.
'
"
I
,
>
>
:_It is thought that the .following‘theory
‘
furnishes the basis of operation of the above
The plate "?lament circuit of the triode T1 described; system; however, it is to. be dis-_
comprises a primary coil of coupling device tinctly‘under'stood that entire reliance is not
and T2.
3 and a plate battery B connected in series tonbe placed on the following theory of
as shown; the plate ?lament circuit of triode operation as a basis 'for explaining the re
T2 comprises the primary coil of coupling
sults
achieved."
'
I,
v‘
‘ I
device It and the plate battery B connected ' As'soo‘n as signal waves of frequency‘ f
in series as shown.
The ?laments of triodes impinge on the antenna 1, these waves 'will
V T1 and T9.. are energized
b
{3
means of the
be} ampli?ed vby triodes T1 and T2 together
common battery A, the currents in said ?la-i with the aperiodic static pulse. The local
ments being independently controlled by circuit comprising the secondary coil of
90'.
coupling device 4 and condenser 5 being
The secondary coilot coupling device 3 tuned to the signal frequency f will convert.
means of variable rheostats-r.
’
'
has one terminal connected to the grid ere-1 the ampli?ed static pulse into a train of
ment of triode T3, and the other terminal of damped oscillations of frequency‘ '
The
said secondary connected to the ?lament of static pulse ampli?ed ‘bytriode T1L will of
said triode. The secondary coil of coupling course make its appearance in the secondary
device 4 has one terminal connected to the coil of coupling device-3 simply as an amplié
grid element of triode T47 and the other ter~ ?‘ed single static pulse. _
_' '
_
minal of said secondary connected to the
'The signal waves of frequency
and at
?lamentoi’ said triode, there being a com single static pujlse are impressed on the grid'
mon connection from said secondaries to'the element of triode T3, and the signal waves
?laments of triodes T3 and T4. A variable of frequency f and a train of damped wavesv
condenser 5 is connected across the terminals
CI] in
100
of frequency f corresponding to the static
of the secondary coil of coupling device 4;. are impressed on the‘ grid element of triode
The plate ?lament circuit of triode T3 T4‘. The signal waves in the plate ?lament
comprises the primary winding of coupling circuit of, triode T3 are combined with the.
device 6, modulation generator S and plate waves of frequency if from the modulating
battery B’, all connected in series as shown. generator S. This results in waves of fre-l
The plate ?lament circuit of triode T4 que'ncy f‘, minus 7” and. f ‘plus f’, together
105
1,687,063
2
with the single static pulse in the plate ?la
ator, If any time during a cycle and O the
ment circuit of triode T3. Waves of fre phase of the electromotive force) then
Sin (211' f’t+O).
V
quency fa 7“ plus f’ and f minus f’ exist in E’=Em
the plate ?lament circuit of triode T‘L due to ‘ In the plate circuits comprising triodes T1
the signal waves andrcorresponding waves ‘and T3 the instantaneous disturbance Pt
,
due to the train of damped waves of fre manifests itself by an alteration or change
quency 7” which was set up in the local cir which is equal to P25 U Sin 0. This altera
cuit comprising the secondary coil of cou~ tion and as a consequence the inductive ac
pling device 4 and condenser 5. The signal tion upon the tuned circuit comprising the
receiver and detector are tuned to the waves secondary coil of coupling devices a and con
10
denser 5 depend upon the angles 0, in other
cuit, comprising the secondaryvcoil of cou words, upon the phase of the modulating
pling device 6 and variable condenser 8, is oscillations at the instant under considera~
AT. According to the value of O, the SO
tuned to the frequency f plus f’. This local tion
circuit converts the single static pulse ap disturbing effect of Pt can be changed more
pearing in the plate ?lament circuit of triode or less and even be entirely-eliminated.' To
T3 into a train of damped oscillations hav obtain the distributing effect for the interval
ing a frequency of 7‘ plus 7”’. The waves of of time between the'two limits t1, t2 it would
frequency f neutralize each other in the cou~ be necessary to repeat step by step the oper
plings 6 and‘ 7 while the waves _of frequency ation for interval AT and it will be seen that
7“ minus f’ are substantially elnninated due the total result will‘ depend upon the de
to'the tuning of the signal receiver and cle velopment or shape‘of the modulating oscil
tector to the frequency 7” plus f’. The signal lation with reference to the way the in
waves of frequency f plus 7”’ in the ‘plate ?la~ stantaneous amplitudes P2 follow each other. 90'
ment circuits of triodes T3 and T4, are in The modulating action brought upon the
phase and are added by the connection of the aperiodic static current modi?es the action
secondary coils of coupling devices 6 and 7. thereof in an unknown manner, depending
However, the train of damped oscillations of upon the shape of such disturbance and‘ this‘ i
of frequency f plus f’; ‘while the local cir
frequency f plus f’ due to the static pulse is, of‘ course, a matter of chance. It can also
in the local circuit comprising the secondary be said that the distribution of the static ac?
30
, coil ofthe coupling device 6 and condenser 8 tions as functions of time is modified by the a
is not in phase with the train of damped modulation.
In
the
circuits
comprising
triodes
T2
and
oscillations in the secondary coil of coupling‘
T4
the
same
static
disturbance
with
instan
device 7.
The-added effect of these two'trains of taneous value Pt produces first in the'tuned
comprising secondary coil of coupling
damped oscillations of frequency f plus f’ circuit
device
4
and condenser 5', a train of damped
due to the static disturbance is therefore not
equal to'twice the effect of one of the trains oscillations of frequency f and amplitude X
of damped oscillations; while the added ef proportional to the hatched area in vFig. 2.
fect of the two- trains of signal‘ waves of The following is" the equation of this train
m
frequency f plus 7” is twice that of one of
the trains of signal waves of frequency f
plus 7''’.
, It is therefore obvious that the e?ect of
the signal is doubled while the effect of the
static is not doubled, which results in a
of oscillations:
‘
'
105
'
X 8-“ Sin are
The plate current of triode T 4 can be 6X~
pressed by the following equations:
~ .110
larger ratio of signal strength to static
strength
'
The plate current of a triode equals’
Hence the static component gives rise in
equals the plate potential and K equals a a coupling device 7 to two trains of waves
“K M iv”, where 1) equals the grid potential, it
constant.
of frequency f-f’ and f-l-f’ (only the
Referring to Fig. 2 let P equal F (T), second one of which is to be reserved by
the form of the electromotive force as a func virtue of the tuning of the signal receiver
tion' of the time produced by the static in and detector); the amplitudes of‘ the said‘
the secondary coils of coupling devices 3 and trains being as a matter of fact entirely in-'
4. Also let Pt be the instantaneous value of dependent of the instantaneous value A T
lift
the said electromotive force during an in
under consideration. In other words}; in the
and chosen at random.
relative actions of the disturbance-and the
terval of time, A T of in?nitely short length circuits comprising triodes ‘T3 and T4 the
If E’ equals the instantaneous electro
, motive force across the modulating gener~
ator S, Em equals the maximum electro
motive force across the modulating gener
($5
ator; 7' equals the frequency of said gener
120
125
signal as a function of time are not modi- '
?ed by the modulation.
In brief, the antenna works upon two
shunts namely T1'—3——T3—(6—8) and T2.—
(4-5)—T4—7 giving rise to two signals
130
3
1,687,063
whose effects become added to one another
prising two triodeshaving their input cir
65
producing a signal twice that which would cuits coupledv to the output circuits of said
be produced separately by each, and to two ?rst mentioned triodes respectively, means
parasitic actions the time distribution of in one input circuit of said ampli?er to ’
which are not necessarily the same, and the convert a static impulse into a wave train
70'
resultant of which, as a consequence, is not of oscillations having the signal frequency,
twice that of each of the component dis-. means to add a modulating frequency to the
turbances.
I
.
signal frequency, means to balance out the
signal frequency and to add the modulated
‘
While I have shown and described a pre
ferred modi?cation of my invention, I do frequencies, and means to detect said added
not limit myself to the sea re but may employ
frequencies. I
such'other embodiments‘ as come within the
4. In a radio receiving system, the com- .
spirit and scope of my invention.
'
bination of an antenna, a‘ pair of triodes
I claim the following:—
" connected in parallel and coupled to said '7
1. In combination, an antenna circuit re antenna, an ampli?er coupled to each out‘
sponsive to sic'nal waves of frequency f and put circuit of said triodes, one only of said 80
static pulses, a ?rst series of circuits for ampli?ers having its input circuit tuned to
20
amplifying the signal waves and the static
pulses and for modulating the signal Waves
andthen converting the static pulses into a
train of damped oscillations of the signal
frequency plus or minus the modulating‘
frequency, a second series of circuits paral
lel to said ?rst series for amplifying the
the signal frequency, a modulating gener
ator connected in the output circuit of each
ampli?er, a detector circuit tuned to the
sum _' of the modulating frequency and the
85
signal frequency, and a circuit interposed
between the detector circuit and the output
circuits of said ampli?ers. ‘
signal Waves and the static pulses and con
'
'
' 5. In a- radio receiving system, the com
verting the static pulses into a’train ‘of binationof an antenna, a pair of triodes con—
90
oscillationsof the signal frequency and then nected in parallel and coupled to said an--‘
amplifying and modulating both the signal tenna, a ?rst transformer-coupled ampli?er
30
50
waves and the train of oscillations corre
associated with the output of‘ one of said >
sponding to the static pulses, and a signal triodes, the input ofsaid ampli?er being
receiver and detector responsive to both said ‘aperiodic, a second transformer-coupled am
?rst and second series of circuits, whereby pli?er- associated with the output of the
the ratio of signal effect to static effect is other of said triodes, the input of said am
substantially increased. "
pli?er being tuned to the signal frequency,
2. The method of increasing the ratio of means for, modulating the outputs of said
signal effect to static effect comprising, ?rst, ampli?ers, a detector circuit, and a trans 100
the ampli?cation of the signal waves and the former-coupled circuit interposed between
static pulse, simultaneously with a second the detector circuit and the output circuits
ampli?cation of the signal Waves and static of the ampli?ers, said circuit having a
pulse and the conversion of the static'pulse secondary tuned to the sum of the modulat- '
into a train of oscillations of signal fre ing. frequency and'signal frequency coupled
quency, secondly, the ampli?cation and to the ?rst ampli?er and another untuned
modulation of the signal waves, simultane secondary coupled to the second ampli?er
ously with a second ampli?cation and modu and connected in series with the tuned sec—
lation of both the signal waves and the train ondary.
‘ ‘
of oscillations corresponding to the static
6. The >method of increasing the ratio 110
pulse, ‘thirdly, the conversion of the static ‘of signal strength to static strength, which
pulse into a train of oscillations having a consists in simultaneously feeding the
frequency equal to the frequency of the received signal .and static pulse thru two
signal waves plus or minus the frequency of parallel branched circuits, in one of said
modulation, and then combining all of said circuits,‘ amplifying both signal and static
waves together whereby the effects of the pulse, modulatingthesignal, and then con
~ impulse equal to the frequency of the signal verting the static pulse into a freely damped
115
waves and the frequency of the modulated wave of a selected modulation beat fre
waves are doubled and the effects of the, quency, in the other of said circuits am-' '
oscillations
60
due
to
the . static
are lnot
plifying the signal, converting. the static
doubled, resulting in a substantial increase pulse to a freely damped wave of the same
of the ratio of signal effect to static effect.
frequency as the signal, and then modulat
3. A signal receiving system for reduc ing the signal and static waves, adding the
ing the ratio of static impulse to signal im energies of the selected modulation beat
pulse comprising an antenna circuit, a pair frequency from each of said branched cir
of triodes connected in parallel and having ‘cuits, and detecting the resultant.
a common input coil coupled to said
antenna circuit, an ampli?er system com
'
HENRI JEAN JOSEPH MARIE de
REGNAULD de BELLESCIZE.