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Патент USA US2411903

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Dec. 3, 1946.
T. SLONCZEWSKI
2,411,903
TRANSMISSION CHARACTERISTIC CORRECTION
Filed March 13, 1943
FIG‘4
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Patented Dec. 3, 1946
2,411,903
UN [TED '
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PATENT
OFFICE
_f’2,411,‘9,o3, ‘
mauslvnssronionaaac'rimrsirrc
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'
OORREGTION
'i'haddeus jSiiof
‘Gienwood Landing, ~ N. Y.,
assighor to" ,ell Telephone Laboratories,._incor~.
'poraited,|New_ York, Y., a corporation of New
York
Application March 13, 1943, Serial No. 479,146
8 Claims. (Cl. 178-44.)‘
1,
2
.
,.
For the-pqreoséssbf the
particular gimuitlu which. the amplifier. 1&1}?
This invention relates to electric wave trans-r
mission circuits and more particularly tohthe ad
justment, correction or compensation oi the level
transmission characteristic, for example, the
I curve
voltage input-output characteristic of. a circuit,
_It not infrequently occursi-t'hat‘ the voltage
actually . coniornptothat, , illustrated by.‘ the curve
UA'B'C'D-C - The adjustment or -.eorre_ctiqn--.-re
transmission characteristic of a portion of a cir
cuit or system. or of the systeinas a-whole,» de~
nectedIacross
This controlthe
circuit
inputmay
to the
comprise
ampli?er:_
a’ detector
of Fig; 2.,
cluded, it may bedesired or consideredlreguisite
.that. the, input-‘output characteristic should
quired is provided by the control circuit, “icon
parts at one or more points or over particular
portions from that needed to meet speci?c trans-7 10 [5 coupled to a frequency modulator ~iiiof-jhe
well-known, reactance tube type for regulating
mission requirements. The requisite equalization
the constant amplitude frequency outpiitioinan
could ‘be obtained by associating with or ‘includ
in, one or moreof theainpli?ers oi the cir
‘ciiitp/suitably designed equalizers .or_ ampli?er
oscillator
?er
48, whose
n.’ The‘iatter
output is is
in coupled
turn‘coupled
to
tomn
'cult
It to
is an
design
object
and
of construct;
this ihv'ent'iomto.
, a "
adiust, cor
of the ampli?er on the grid'side dl’lthefcoiipliilng
cotidenser.l2.. The const'a'iits" oi the-frequency
interstage networks. ‘' Suchl equalizers or net 16 equalizer I! of suitable loss-frequency character
istic. The equalizeraoutput is connectedthrbugh
works, however. maybe quite-complex, and dim~
a rectifier 20, ‘to’thelinputIgrid-cathode}circuit
rect or compensate'the level transmission char
acterlstic, forexample, the voltage: inp'uhoutput
characteristic of an ampli?er in a .relativ'ely
simple manner.
1
.
~, ‘
-
20
modulat'or-goscillator ctr-‘cult. would be chosen“ so
that the‘; output frequency 01 the oscillator bears
a substantially linear relation to the input
"
voltage of the modulator as illustrated 'byfthe
71h accordance with a speci?c embodiment of
‘curve at Fig, 3. ,y'ifherdesign oi theequali'zer would
the invention disclosed‘ herein; the level trans
mission characteristic of a circuit‘, is adjusted 25 be such, that the‘con'stant amplitude.‘ niry'ijiig
or corrected. in preassigned respects'by translat
frequency wave input thereto will be attenuated
ing a portion of the variable amplitude input to
the circuit into direct current potehtials, generat
ing under control of said pot'ent'iai's'jjla constant
‘amplitude, variable Irequency. wave having a
linear frequency-control potential characteristic,
modifying the generated‘ wave by transmitting it
through an equalizerhav-i'ng ,the required loss
ire'quency characteristic, ‘translatingv the modi~
hedj wave into direct current potentials and ini
such‘ thiit the attenuated OSCiIIalJMIiSQYV'B‘Q 'in
amplitude in correspondence to the vane-tug? ‘r ‘ qulred’to?be lhtroducedlin the normal‘, 1 pa,
30
the characteristic _j per curve"
oi Elli-$3111
order to modify it'to the desiredfcharacteri'stip,
that is, the 'ciiaracteristit be; curgeniaicpr ,9:
35
pressing the latter on the input of the circuit‘ for
gain control action.
Fig. 2. _ File. 4 iliusti’ates th'el'oss irejqueilcyljcn, 1i;
acteristic that the equalizer would have‘to, enfa 1e
obtaining the modi?ed characteristic A'B'C'D" of
Fig. 2. The points A", B", C", D" on the curve
of Fig. 4 corresponds to. points A’. B’, $3.131 on
> A more complete understanding, oi’ the inven
tion will be obtained from the detailed descrip
tion that follows taken in conjunction with the
showing of the appended drawing whereinz.
ouiput' characteristic > of the ampli?er; that 13's.
the curve inFl'g. 2‘.
40
Fig. 1 illustrates a circuit arrangement em‘
b'odying the invention; and ’
,
t
:_
In operation, a portion oi the variable ampli
tude input wave to the, ampli?erlil is detected
in the detector l5 and translated into direct cur
rent potentials corresponding to the instantane
ous amplitude of the input wave‘ These poten
Figs. 2, 3 and 4 show curves to be referred to
45 tials are applied to the grid electrode of the‘ re
in explaining the principle of the invention.
With reference to the drawing, thejinvention
actance-tube modulator IE to vary thee?'ective
he resistance-capacity coupled, for example, to
reactance thereof and, consequently, that of, the
irequency‘determining circuit 21 of the oscilla—
tor. The oscillations generated by the oscillator
will vary substantially linearly with the varia
tions in the input potential to the modulator,
and wiil be of constant amplitude, The output of
the oscillator may be ampli?ed to the desired or
necessary level by the ampli?er stage IB, and
then applied to the equalizer to be attenuated
a succeeding ampli?er stage (not shown), or
in accordance with a los3~ircquency character
other circuit components included generally by
the designation output‘ The input to the ampll
?er may comprise a variable amplitude signal
istic determined by the desired modi?cation in
the input-output characteristic under adjust
is illustrated as applied to the correction or ad
justment of the input-output or voltage transmis
sion characteristic of a transmission circuit com
prising an ampli?er. The ampli?er may com
prise a vacuum tube or electronic device Ill whose
input grid»cathode circuit ‘may be connected to
input terminals ll, ll through a coupling con
denser l2. and whose cathode-anode circuit may
wave.
The ampli?er may have a voltage input
output characteristic illustrated generally by the
Fill
ment or correction. The attenuated oscillations
are translated by the recti?er into direct current
potentials and‘are applied to the grid-cathode
3
2,411,903
4
circuit ,gfvthe' ampli?er to adjust theigain of ‘the
output characteristic and means-to {correct said
ampli?er ‘in positive or negative direction with
variation in the amplitude of the input wave",
thereby introducing the correction required ‘to
characteristic in desired respedts, ‘said means
pomprising means for translating 0. portion of a
variable amplitude wave input to the ampli?er
provide the output corresponding tothat ‘required
into -a constant amplitude, variable frequency
in accordance with the desired input-output
wave, means for translating said latter wave into
characteristic.
a wave varying in amplitude related to the de
Although the inventionis disclosed with refer
sired correction
said input-output character
151210, and meansrfor converting the amplitude
ence to a single embodiment .therveoiv, it will be
understood that it is not limited thereto but is 10 variable frequency wave into direct current po
of a scope evidenced by the appended claims.
tentials for application to the input of said am
What is claimed is:
pli?er.
'
1. The method of correcting the input-output
6. ;In combination. an ampli?er having a par
characteristic of a, circuit that comprises trans
ticular input-output characteristic, an input cir
lating a portion of the variable amplitude input
cuit and an output circuit for said ampli?er, a
‘ the circuit into control potentials, generating
source of variable amplitude electric wave to be
constant amplitude oscillations varying'flinearly in
i’reduency with respect to said potentials, atten
applied to said’ input circuit, and gain control
uating the oscillations in accordance with a loss
f'requency characteristic related to the desired 420
deviations in the normal input-output character
l'stic, and translating said vattenuated oscillations
into control potentials for application to the in
put of said circuit,
' ‘2. The method of correcting the input-output 25
characteristic of a circuit that comprises trans
lating a portion of the variable amplitude input
‘ ‘56 the. circuit into direct current control poten
this implies constant amplitude Oscillations
va
,
, zilieesrlrin frequency with respect to said‘ 80
.pgislliials. attenuating. the Oscillations in accord
'ance with a‘loss-frequency characteristic related
59 the desired deviations in the normal input
euieilt eheravterisiia and ‘translating said atten
input-output characteristic in preassigned re
spects, said means comprising a circuit for trans
lating a portion of the wave input to the ampli?er
into a constant amplitude variable frequency
wave, the frequency of which varies with varia
tion in and in direct proportion to the amplitude
of the input wave, and means for attenuating
said variable frequency wave so that the wave
has an amplitude-frequency characteristic corre
sponding in outline to that of the desired oor~
rested input-output characteristic, and for trans
lating the attenuated wave into potentials for ‘ap
plication to the input-circuit of the ampli?er'in a
sense to produce gain changes in the ampli?er
effecting preassigned deviations from the normal
gated oscillations into direct current control po
teritials for application to the input of said cir
cuit for ‘gain control purposes.
input-output characteristic of ,the?i‘impli?er.v
_
‘I. In combination, an ampli?er "havingja‘ par
ticular input-output characteristic, an'input cir
3’. in combination, a, wave transmission circuit
having normally a particular input-output char
acteristic and means to modify said characteristic
means to vary the gain of the ampli?er in re
sponse to the wave ‘input thereto to modify said
cult and an output circuit, a source of variable
40
in desired respects, said means comprising means
to derive from the input wave to said circuit po
testicle mrresconding to the varying amplitude
9‘! said wave, means responsive to said potentials
to generate constant amplitude oscillations vary
_ng' in frequency linearly with respect to said po
tential's, means for attenuating said oscillations
oscillations vary in am
?lirii lélilit'l the attenuated
,
pitude related to the deviations required to be
introduced in the normal input-output character- '
lstlc to, modify it to the desired characteristic, and
means for deriving potentials corresponding to
the varying amplitude of said attenuated oscilla
tigns and for applying said potentials to the input
of. an circuit
Q. In combination, a wave transmission circuit
having normally a particular input-output char
acteristic and means to modify said characteristic
in desired respect, said means comprising a recti
?er for deriving from the input wave to the cir
cuit direct current potentials corresponding to the
varying amplitude of said wave, a reactancc-tubc
modulator-oscillator responsive to said potentials
to generate a constant amplitude, variable fre
quency output varying in frequency linearly with
respect to said potentials, means for modifying
amplitude electric wave to ‘be applied to saidinput
circuit, and gain control means for said ampli?er
to vary the gain of the latter in response to a
function of the input wave to modify said input
output characteristic in unassigned respects.
said means comprising means to derive direct
' current potentials from a portion of the input
wave, means responsive to said potentials to gen
erate a constant amplitude, variable frequency
wave the frequency of which varies in direct pro
portlon to the magnitude of said potentials,
means to vary the amplitude of said variable fre
quency wave as a function of the gain correction
required to modify said input-output character
lstic in the desired respects, and means to derive
direct current potentials from said variable 'am
plitude, variable frequency wave for application
to the input circuit of said ampli?er.
8. In combination, a wave transmission circuit
having normally a particular input-output char
acteristic, and means to modify said character
istic in preassigned respects, said means compris
ing means to derive from the input wave to the
circuit direct current potentials corresponding to
the varying amplitude of said wave, oscillation
generating means responsive to said potentials ‘to
' generate constant amplitude oscillations varying
in frequency linearly with respect to said poten
the oscillator output in accordance with a loss
frequency characteristic related to the desired
modi?cation in said normal input-output char~
tials. means for attenuating the oscillations such
that the attenuated oscillations vary in amplitude
in correspondence to the desired deviations from
actcristic, and a recti?er for deriving direct cur- "
said particular input-output characteristic, and
rent potentials corresponding: to the varying am‘
means for deriving direct current potentials cor
plitude of_ the modi?ed oscillator output for up»
plication to the input of said circuit,
Q. In combination, a wave transmission circuit
responding to the varying amplitude of said atten
uated oscillations and for applying said second
mentioned potentials to the input of said circuit,
including an amplifier having a particular input~
THADDEUS SLONCZEWSKI.
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