close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Dec. 31, 1946.
J. c. WILSON
2,413,423 I
COLOR TELEVISION SIGNAL-TRANSLATING SYSTEM
Filed May 2, 1941
whiIm-E
INVENTOR
‘
JOFN O. WILSW
BY
ATTORNEY
-
Patented Dec. 31, 1946
2,413,423
UNITED-l“ STATES PATENT oFFIcE
John C. Wilson, Bayside, N. -Y., assignor, by
mesne assignments, to Hazeltine Research, Inc.,
Chicago, Ill., a corporation of Illinois
' '
Application May 2, 1941, Serial No. 391,480
11 Claims. .(Cl. 178-54)
2
particular colors of the image being translated,
is changed in accordance with the color corre
This invention relates generally to color televi
sion signal-translating systems and, particularly,
to such systems of the type having a single sig
nal-translating channel for successively and cy
sponding to the signal being translated.
clically translating each of a plurality of televi
sion signals which individually correspond to par
ticular colors of the image being translated and
including provisions for modifying the color bal
ance of the signal representative of the trans
lated image.
'
It‘ is another object of the invention to provide
a color television signal-translating system in
which the color balance is modi?ed in a single
signal-translating channel which translates a plu
rality of signals individually corresponding to par
ticular colors of the image being translated. -
In accordance with the invention, a color tele
vision signal-translating system comprises a sin
'
In any color television signal-translating sys
tem it is desirable to effect an over-all color bal
ancing in the reproduced image. It has for
gle signal-translating channel for successively
and cyclically translating each of a plurality of
television signals which individually correspond
merly been proposed in color television receiv
ers to effect this color balance in the reproduced 15 to particular colors of the image being translat
ed. ‘The system also comprises means for ad
image by means of color ?lters of ?xed charac
tcrlstics in separate optical paths, so that only
light of the desired color is transmitted in each
optical path, and then to adjust the relative
amount of light transmitted in the optical paths 20
justing an operating characteristic, for example,
the gain of the signal-translating channel, and
means for cyclically controlling the adjusting
means to effect an individual predetermined op
by means of additional neutral-tint ?lters or
wedges. This process of adjustment of the rela
erating characteristic in the channel for each of
the plurality of signals. The arrangement is ef
tive amounts of light transmitted for the several
colors tends to be both, inaccurate and cumber
some. This is particularly true where compen
sation at the receiver must be made for various
tyes of light sources at the transmitter or stu
dio, or where the same received signal is used
fective to control the color balance in the signal
representative or the translated image when the
operating characteristic which is controlled is the
gain of the receiver.
having luminescent screens of di?erent spectral
drawing and its scope .will be pointed out in the
distribution are involved.
It has also been proposed to provide a sepa
rate signal-translating channel in a television sys
appended claims.
For a better understanding of the present in
vention. together with other and further objects
with various types of light sources at the re
thereof, reference is had to the following descrip
ceiver, that is, where receiving tubes individually 30 tion taken in connection with the accompanying
The single ?gure of the drawing is a circuit dia
gram, partly schematic, of a complete television
tem for signals corresponding to light of each 35 receiver of the superheterodyne type embodying
color and to adjust the relative gains of such
a color television signal-translating system in ac
channels, thereby to adjust the relative amount
cordance with the invention.
of light produced at the receiver for each color.
Referring now more particularly to the draw
However, this procedure has not been possible
ing, the system illustrated comprises a receiver
I in a system in which a single signal-translating 40 of the superheterodyne type including an antenna
‘ channel is provided for translating a plurality of
system i 0, ll connected to a radio-frequency am
signals individually corresponding to particular
pli?er l2 of one or more stages, to which is con
colors of the image being translated, as is gen
nected in cascade, in the order named, an oscil
lator-moduator [3, an intermediate-frequency
erallypreferred for reasons of simplicity and
economy.
"
I
,
45 ampli?er M of one or more stages, a detector and
It is an object of the invention, therefore, to
provide an improved colortelevision signal-trans
A. V. C. source I5, 2. video-frequency ampli?er it
lating system which is not ‘subject to one or more
of the above-mentioned disadvantages of prior art
device I l. A line-scanning circuit l8 and a ?eld
scanning circuit l9 are coupled to the output cir
cuit of detector l5 through a synchronizing-signal
arrangements.
It is another object of the invention to provide
a color television signal-translating system in
which the operating characteristic of a single'sig
pal-translating channel, which translates a pin
of one or more stages, and an image-reproducing
w.
separator 20 and have output circuits coupled,
respectively, to line-scanning windings 22, 23 and
?eld-scanning windings 24, 25 of signal-repro
ducing device ll. Image-reproducing device l1
rality of signals individually corresponding to 56 includes a conventional electron gun structure 26
2,418,4as
3
4
and ?uorescent screen 2'! and is provided with a
suitable source of unidirectional current 23 there
for, as illustrated. An automatic ampli?cation
.
designed that during successive thirds of a com
plete revolution of the shaft of motor M connec
tions are successively made between brush 33 and
control potential, derived from ‘unit I5, is applied
brushes 33, 43, and 3|, respectively. In this way,
to one or more of the tubes in radio-frequency
ampli?er l2, oscillator-modulator I3, and inter
tap 3| is effective to adjust or determine the gain
of ampli?er l3 during the ?rst one-third revo
mediate-frequency ampli?er H in a conventional
manner. A sound-signal reproducer 2| of con
lution of the shaft of motor M, tap 32 is effective
ventional design is coupled to an output circuit of
intermediate-frequency ampli?er ll. The stages
or units Ill-2|, inclusive, may all be of. conven
tional well-known construction so that detailed
illustration and description thereof‘ are deemed
unnecessary herein.
I
10
during the next one-third revolution, and tap 33
is effective during the remaining one-third rev
olution.
,
A color screen having red, green, and blue ?lter
sectors is also mounted on the shaft of motor M
and is so disposed with respect to the ?uorescent
screen 21 of the cathode-ray reproducing device
l‘l that the screen may be viewed through the ?l
ter in any suitable manner. A source of alter
Referring brie?y to the operation of the system
described above, television signals intercepted by
antenna circuit Ill, H are selected and ampli?ed
nating current 33 is provided for motor M and,
in radio-frequency ampli?er l2 and coupled to
in order to synchronize the motor M with corre
the oscillator-modulator I3, wherein they are
sponding color-changing apparatus at the trans
converted into intermediate-frequency signals 20 mitter, there is provided a phase-locking device
which, in turn, are selectively ampli?ed in the
44 adapted to be synchronized by a synchroniz
intermediate-frequency ampli?er “and deliv
ing signal derived from synchronizing-signal sep
ered to the detector IS. The modulation compo
arator 20.
y
In considering the operation of the portion of
nents of the signal are derived by the detector
l5 and are supplied to the video-frequency am 25 the system of Fig. 1 constituting the present in
pli?er l6 wherein they are ampli?ed and from
vention, it will be assumed that a triple-inter
which they are supplied, in the usual manner, to > laced color television signal of conventional form
a brilliancy-control electrode of the image-re
is being received, the signals of each ?eld corre
producing device II. The modulation compo
sponding to a predetermined color ?eld of the
nents of the signal derived by detector l5 are also 30 translated image. The stages |2-—|'|, inclusive,
supplied to synchronizing-signal separator 20
therefore, constitute a single signal-translating
wherein synchronizing signals are derived and
vchannel for successively and cyclically translat
app.ied to synchronizing-control elements of cir
ing each of a plurality of television signals which
cuits l8 and I9. The intensity of the scanning . individually correspond to particular colors of the
image being translated. The motor M is synchro
ray of device I‘! is thus modulated or controlled
in accordance with the video-frequency voltages
nized with corresponding color-changing appa
impressed upon its control grid in the usual man
ner. Scanning waves are developed in the line
ratus at the transmitter and its phase is so con
sion signals are reproduced in unit 2| in a con
ventional manner and the bias derived from unit
fective to cause tap 3| to be effective during one
trolled by phase-locking unit 44 that the red ?l
scanning circuit | 8 and ?eld-scanning circuit l3
ter is in the e?ective optical path of the receiver
and applied to the scanning elements of the im 40 when television signals corresponding to red are
age-reproducing device I‘! to produce electric
being received, etc. Therefore, it is possible by
scanning ?elds, thereby to de?ect the scanning
manuallyadjusting the taps 3|, 32, and 33 of re
ray in two directions normal to each other so as ,
sistor 30 to adapt the receiver to provide a prede
to trace a rectilinear pattern on the screen and
termined gain for the signal corresponding to the
thereby reconstruct the transmitted image.
color being translated. That is, the commutat
Sound signals accompanying the received televi
ing arrangement on the shaft of motor M is ef
?eld-scanning period, tap 32 to be effective dur
I5 and applied to the preceding receiver stages
ing the succeeding ?eld-scanning period, and tap
serves to maintain the signal-input amplitude to
33 to be e?fective during the last ?eld-scanning
detector I5 within a relatively narrow range for ~
period of each frame intervalv and, therefore,
a wide range of received signal intensities.
comprises a means for cyclically controlling the
Referring now more particularly to the portion
adjusting means including resistor 30 to effect ‘an
of the system of Fig. 1 embodying the invention, '. individual predetermined ampli?cation in video
there is provided an adjustable gain control for
frequency ampli?er It for each of the translated
video-frequency ampli?er l6 which comprises a
plurality of signals corresponding to the three
potential-dividing resistor 30 having adjustable
color ?elds, thereby to modify the color balance in
taps 3|, 32, and 33 for adjusting the gain of the
the signal representative of the translated image.
signal-translating channel of the receiver. The
If a different cathode-ray signal-reproducing
adjustable gain control also comprises means in 60 device is substituted in the receiver of Fig. 1, it
cluding a motor M for cyclically controlling the
will probably be desirable to change the settings
adjusting means comprising resistor 30 to effect
of the various taps on resistor 30 in order to
an individual predetermined ampli?cation in the
e?’ect a satisfactory color balance in the repro
signal-translating channel of the receiver for
duced image. Also, if the television receiver is
each of a plurality of television signals which
tuned to a different transmitter it will probably
individually correspond to particular colors of the
be found desirable to readjust the color balance.
image being transmitted, thereby to modify the
While there has been illustrated acommutator
color balance in the signal representative of the
means of a mechanical type driven by motor M
transmitted image. In order to effect this type
and responsive to- the synchronizing signals of
of operation, there is mounted on the shaft of 70 the system, it will be- understood that other
motor M a _commutating arrangement including
equivalent types of controlling arrangements may
a slip ring 34 and co-operating brush 3!, as well
be used ‘for adjusting the gain of the receiver
as commutator segments 36, 31, and 38- having
in accordance with the invention. Thus, a local
cooperating brushes 39, 40, and ll, respectively.
oscillator may be provided to develop suitable
The commutator segments 36, 31, and 38 are so 75 keying signals for a gain-control means. Fur-
2,413,428
6
thermore, it will be understood that the inven-'
tion is not limited to the speci?c type 0! gain
control means illustrated but may utilize other
o
.
trolling said adjusting means to effect an indi
vidual predetermined ampli?cation in said chan
nel for each of said plurality of signals to con
trol the color balance in the signal representative
equivalent forms, such as an automatic ampli?
cation control system the effect of which is ad
justed in accordance with the color corresponding
of the translated image.
6. A color television signal-translating system
to the particular signal being received.
‘ comprising, a single signal-translating channel
While there has been described what is at pres
for successively and cyclically translating each 01'
ent considered to be the preferred embodiment
a plurality ortelevision signals which individu
of this invention, it will be obvious to those skilled 10 ally correspond to particular color ?elds of the
in the art that various changes and modi?cations
image being translated, means for adjusting the
may be made therein without, departing from the
gain or said signal-translating channel, and
means for cyclically controlling said adjusting
invention, and it is, therefore, aimed in the ap
pended claims to cover all such changes and
means to eil'ect an individual predetermined am
modi?cations as fall within the true spirit and 15 pli?cation in said channel for each’ of said plu
scope of the invention.
rality of signals to control the color balance in
What is claimed is:
the signal representative of the translated image.
l. A color television signal-translating system
7. A color television signal-translating system
comprising, a single signal-translating channel
comprising, a single signal-translating channel
for successively and cyclically translating each 01' 20 for successively and cyclically translating three
a plurality of television signals which individually
television signals which individually correspond
to particular colors or the image being translated,
means for adjusting the gain or said signal-trans
lating channel, and means for cyclically control
ling said adjusting means to effect an'individual
correspond to particular colors of the image being
translated, means for adjusting an operating
characteristic of said signal-translating chan
nel, and means for cyclically controlling said ad 25
justing means to e?ect an individual predeter
predetermined ampli?cation in said channel for
mined operating characteristic in said channel
each of said plurality of signals to control the
for each of said plurality of signals.
4
color balance in the signal representative of the
2. A color television signal-translating system
translated image.
comprising, a single signal-translating channel 30
8. A color television signal- receiver compris
for successively and cyclically translating each of
ing, a single signal-translating channel for suc
a plurality of television signals which individually
cessively and cyclically translating each of a pin
correspond to particular colors of the image being
rality of television signals which individually cor
translated, means for adjusting the gain of said
respond to particular colors of the image being
signal-translating channel, and means for cycli 35 translated, means for adjusting the gain of said
cally controlling said adjusting means to e?ect
signal-translating channel, means for changing
an individual predetermined ampli?cation in said
the color of light in the signal reproduction for
channel for each of said plurality of signals to
each of said plurality of television signals, and
control the color balance in the signal repre
sentative of the translated image.
'
40
means operated synchronously with said last
mentioned means for cyclically controlling said
adjusting means to‘ enact an individual prede
termined ampli?cation in said channel for each
of said plurality of signals to control the color
vidually correspond to particular colors of the, ' balance in the signal representative of the trans
lated image.
image being translated, means for adjusting the
9. A color television signal receiver comprising,
gain of said signal-translating channel, and
a single'signal-translating channel for succes
means for cyclically controlling said adjusting
sively and cyclically translating each or a plurality
means in synchronism with said cyclically-trans
lated television signals to effect an individual 50 of television signals which individually corre
spond to particular colors of_ the image being
predetermined ampli?cation in said channel for
‘ translated, means for adjusting the gain of‘ said
each of said plurality of signals to control the
signal-translating channel, means for changing
balance in the signal representative of the trans
the color of light in the signal reproduction for
lated image.
each of said plurality of television signals, and
4. A color television signal-translating system
means responsive to said last-mentioned means
comprising, a, single signal-translating channel
for cyclically controlling said adjusting means to
for successively and cyclically translating each
effect an individual predetermined ampli?cation
of a plurality of television signals which indi
in said channel for each of said plurality of sig
vidually correspond to particular colors of the
nals to control the color balance in the signal
image being translated, means for manually ad
representative of the translated image.
justing the gain of said signal-translating chan
10. A color television signal-translating sys
nel, and means for cyclically controlling said ad
tem comprising, a single signal-translating chan
justing means to e?ect an individual predeter
mined ampli?cation in said channel for each of
nel for successively and cyclically translating each
said plurality of signals to control the color bal 65 of a plurality of television signals which individ
3. A color television signal-translating system
comprising, a single signal-translating channel
for successively and cyclically translating each
of a plurality of television signals which indi
ance in the signal representative of the trans
ually correspond to particular colors of the image
lated image.
being translated, means for adjusting the gain
5. A color television signal-translating system
of said signal-translating channel, and commu
comprising, a single signal-translating channel
tator means for cyclically controlling said adjust
for successively and cyclically translating each of 70 ing means to effect an individual predetermined
a plurality of television signals which individually
ampli?cation in said channel for each of said
correspond to particular colors of the image being
plurality of signals to control the color balance
translated, means for adjusting the gain of said
in the signal representative of the translated
signal-translating channel for each of said plu
image.
rality of signals, and means for cyclically con 75 ll. A color television signal receiver compris
8,418,428
i
ing, ra single signal-translating
7
channel for sue-"g
cessively and cyclically translating a plurality of;
television signals which individually correspond‘
to particular colors of the image being translated,
means for adjusting the gain in said signal-trans
lating channel, means for synchronizing the op
eration of said receiver with a received siznal, and \ ’
8
means responsive to said synchronizing means
for cyclically controlling said adjusting means to
effect an individual predetermined ampli?cation
in said channel for each of said plurality of sig
nals to control the color balance in the signal rep
resentative of the translated image.
‘
.
JOHN C. WILSON.
Документ
Категория
Без категории
Просмотров
0
Размер файла
568 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа