US2420303A - Stable frequency conversion system - Google Patents

Stable frequency conversion system Download PDF

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Publication number
US2420303A
US2420303A US464750A US46475042A US2420303A US 2420303 A US2420303 A US 2420303A US 464750 A US464750 A US 464750A US 46475042 A US46475042 A US 46475042A US 2420303 A US2420303 A US 2420303A
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oscillator
frequency
voltage
tube
frequencies
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US464750A
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France Henri De
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Definitions

  • the present invention relates to oscillation generating systems for use in connection with television and like apparatus.
  • the present application is a continuation of my prior application Serial No. 440,860, filed April 28, 1942.
  • An'object of the invention is to provide oscillation generator systems, with means and methods for the adjustment thereof, which are especially, although not exclusively, applicable to apparatus for the transmission of television picture and line signals, such systems being more stable, and better adapted to meet the requirements of practice than those used for the same purpose up to the present time.
  • Another object of the present invention is the provision of a frequency demultiplier or multiplier which maintains the frequency conversion ratio in a more accurate manner than in the systems used for the same purpose up to the present time.
  • Fig, 1 is a diagram of a system for the transmission of synchronisation signals for television, according to the invention
  • Fig. 2 is a curve illustrating the saw-tooth voltage supplied by the first stage of the system of Fig. 1 and the frequency of which is to correspond to that of the line signals;
  • Fig. 3 is a curve similar to that of Fig. 1 illustrating the production of the picture synchronizing signals obtained at the output end of the systems;
  • Fig. 4 is a curve illustrating the voltage of an alternating current distribution system to be superimposed, according to a feature of the invention, on the picture synchronizing signals produced by a system of the kind of Fig. 1;
  • Fig. 5 is a similar curve illustrating the result of this superimposition of voltages
  • Fig. 6 diagrammatically shows the whole of a line and picture frequency generating system for use in television, and of a device for the control of the frequencies, according to the invention
  • Fig. 7 diagrammatically shows the relaxation tubes which can' advantageously be used in such a combined system according to the present invention
  • Fig. 8 is a view, similar to Fig. 7, showing similar tubes made according to a modification.
  • the system includes, after the first oscillator, tuned to the frequency of 22,050 per second, four oscil- 3 lators respectively synchronized to the following frequencies:
  • each of said oscillators depends upon the discharge speed of a condenser, as is the case with oscillators or multi-vibrators of the relaxation type, this speed being itself a function ofa voltage impressed, for instance, upon one of the electrodes of thetube or of one of the tubes of the corresponding oscillator, the regulating will consist in regulating the above mentioned voltages of the respective oscillators from a common device, such for instance as a potentiometer.
  • Fig. 1 I have shown a group of multivibrators or relaxation oscillators, of known types, the first two oscillators only being shown on the drawing.
  • Compartment I contains the main oscillator. Condenser I discharges slowly into pentode tube 2, and it is charged suddenly through tube 3 during the short time for which the latter is not fully blocked by its polarization. An auxiliary tube 4 may be provided, inknown manner, for accelerating the beginning of the charge.
  • proportional amounts which also ensures proquency, is initially regulated through any known 7 means, for instance by adjusting the screen voltage of tube 2, which determines the value of the plate current. This adjustment is efiected by means of a potentiometer 5 or through any other means.
  • Compartment II which is connected to the first compartment through a capacity or other coupling, includes elements I, 2, 3, 4', similar to those of the first compartment.
  • the capacity of condenser I is greater in such manner as to supply a lower frequency, with the demultiplication ratio that has been chosen.
  • means such as a tube 6 or the like for ensuring synchronizing, by frequency demultiplication, of compartment II with compartment I.
  • Compartments III, IV, etc. in turn supply demultiplied frequencies.
  • the last one produces, at its output end, at B, a voltage at the frequency of the picture synchronizing signals, for instance per second and in 'a form illustrated by the curve of Fig; 3.
  • the voltage that is obtained is caused to act upon at least one of the compartments I, II, etc., or upon each of these compartments, through one of the elements upon which the frequency depends, for instance the control grids of tubes I,
  • detector 9 includes a diode tube II] and the negative rectified voltage II is utilized for polarizing the control grids, with suitable couplings shown at I2, I2, etc., the whole being arranged in such manner that an effect is produced upon the discharge speed of condensers I, I, etc., in a correcting direction, that is to say in such manner as to bring the final frequency of signal B to a value equal to that of the distribution system.
  • the whole of the oscillator system is first arranged in such manner as to include a fundamental generator coupled with a series of generators of proper sub-multiple frequencies, which are interrelated to one another, as above described.
  • These generators are preferably such that they supply a saw-tooth curve, because such an arrangement permits of increasing the accuracy and the stability of the interrelation between the generators, and therefore the synchronism.
  • the synchronizing signals coming from the preceding generator are applied to the grid of thyratron U through a condenser 3
  • the leak resistance is shown at 32 and the adjustable resistance at 33.
  • the plate of the thyratron which is connected with high voltage HT through an adjustable resistance, returns to the ground through a condenser V.
  • the cathode circuit is positively polarized.
  • the saw-tooth signals coming from said plate (and diagrammatically shown on the drawing) are then transmitted through a condenser 34 to the grid of a tube 35 which feeds, with the usual phase difference of a sawtooth current (also shown in the drawing). These signals are finally transmitted to the next generator and so on.
  • Fig. 8 shows an analogous system in which the same reference numerals designate the same elements. The only difference lies in the fact that the signals, indicated on the drawing, result from the practically instantaneous charge and discharge of cathode U.
  • a resistance R I obtain in said circuit very short signals (top of Fig. 8) corresponding to the successive discharges of condenser V. These signals are utilized for synchronizing the next generator.
  • Such systems produce saw tooth curves of very sharp shape which are well adapted to the desired purpose.
  • I combine means for checking the accuracy of the synchronism, that is to say the demultiplication, which means are constituted by at least one cathode oscillograph whose plates or series of plates may be coupled at will with at least two of the various generators. I can thus render visible the synchronism that is obtained, in accordance with the aspect of the resultant curve shown in said oscillograph.
  • the same checking operation can be performed with the following generators such as E, F, G, and this either with another oscillograph O as shown, or by means of the same oscillograph O associated with the switch a including a suitable number of contact points.
  • l may utilize supplementary syn- I cially intended'for television, which'comprises, in
  • each oscillator device including a potentiometer determining the frequency of the oscillations produced by such device, coupling means interconnecting said'o'scillator devices so that the frequency of one depends upon the frequency of the other, and a common potentiometer for applying a potential simultaneously to the potentiometers of the oscillator devices to simultaneously regulate the frequencies of said oscillator devic'es,'and thereby positivelymaintain the desired ratio of said frequencies.
  • a system for'generating oscillations, 'especially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including an element determining the frequencyof the oscillations produced by such device, means interconnecting said oscillator devices so that the frequency of one depends upon the frequency of the other, a common means for applying a potential simultaneously to said elements of the oscillator devices to simultaneously regulate the frequencies of said oscillator devices, and thereby positively maintain the desired ratio of said frequencies, means for superimposing a'stan'dard alternating voltage on the voltage obtained atthe output of the final oscillator device, means for: detecting the tops of the curve corresponding to the superimposed voltages, and means for causing the voltage thereby obtainedto act on at least one 7 of said'oscillator devices.
  • a system for generating oscillationsjespecially intended for television which'coniprises, in combination, at least two oscillator devices, each oscillator device including an element "determining the frequency-of thebscillations produced by such device, coupling meansinterconnecti'ng said oscillator devices so that the-frequency of one depends uponthe frequency of thelother, a common potentit'mieter simultaneously applying a 'pote ntialto 5 said elements fof the oscillator devices to simultaneously, regulate the frequencies of saidfoscillator"devices, and
  • a system for'generating oscillations especially intended for television, whichcomprisesjin combination at least two oscillator devices, each oscillator device including apcteniometer deter mining the frequency of'the' oscillations produced by such device, coupling means interconnectin said oscillator devices so that the frequency of one depends upon the frequency of the other, a common potentiometer for applying a potential simultaneously to said potentiometers of the oscillator devices to simultaneously regulate the frequencies of said oscillator devices, and thereby positively maintain the desired ratio of said frequencies, means for superimposing a standard a1- ternating voltage on the output of'final oscillator device, means for detecting the tops of the curve corresponding to the superimposed voltages, and means for causing the voltage thereby obtained to acton at least one of said oscillator devices.
  • a system for generating oscillations especiall intended for television which comprises, in combination at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to slowly discharge through the firstmentioned tube and to be suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliary tube connected in a manner to accelerate the beginning of the charge of the condenser, and adjusting means connected with the screen of thefirst mentioned tube for adjusting the screen voltage thereof, so as to determine the plate current thereof, means for coupling the oscillator devices, the respective condensers of the oscillator devices being of different capacities so as to obtain the desired ratio of frequencies of said oscillator devices, means for transmitting the voltage from one of the oscillator devices to the other, and a single means for feedin a potentialto said means for adjusting the screen voltages of the first mentioned tubes'ofsaid oscillator devices.
  • a system for generating oscillations especially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to slowly discharge'through the first-mentioned tube and to be suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliary tube connected in a manner to accelerate the beginning of the charge of the condenser, potentiometers connected with the screen of each of the first mentioned tubes for adjusting'the screen voltages thereof, so as to determine theplate currents thereof, coupling means for connecting the'first oscillator device with the second, the condensers of these oscillator devices being chosen of different capacities so as to obtain the desired ratio of the respective frequencies of said oscillator devices, means for transmitting the voltage from the first oscillator device to the second, and a single adjustable means for feeding the potentiometers for adjusting the screen voltages of j the first mentioned tubes of
  • a system for generating oscillations especially intended for television which comprises, in combination, at least two oscillator devices, 'each' oscillator device including a'pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to slowly discharge through the first mentioned tube and to be suddenly charged through thefsecond mentioned tube when the latter is not blocked by'polarization, an auxiliary tube connected to accelerate the beginning of the charge of the condenser, potentiometers connected with the screen of each of the first mentioned tubes for adjusting the screen voltages thereof, so as to determine the plate currents thereof, coupling means.
  • the respective condensers of these oscillator devices being chosen of different capacities so as to obtain the desired ratio of the respective frequencies of said oscillator devices, means for transmitting the voltage from the one oscillator device to the other, and a single potentiometer for feeding the potentiometers for adjusting the screen voltages of the first mentioned tubes of said oscillator devices.
  • a system for generating oscillations especially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to discharge through the first mentioned tube and to be suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliary tube connected to accelerate the beginning of the charge of the condensers, a potentiometer connected with the screens of each of the first mentioned tubes for adjusting the screen voltages thereof, so as to determine the plate currents thereof, capacities for coupling the first oscillator device with the second, the respective condensers oi the oscillator devices being chosen of different capacities so as to obtain the desired ratio of the respective frequencies of said oscillator devices, a tube for transmitting the voltage from the first oscillator device to the second, and a single potentiometer for feeding a potential to the potentiometers provided for adjusting the screen voltages of the first mentioned tubes of said oscill
  • a system for generating oscillations especially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to discharge through the firstmentioned tube and to be suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliary tube connected to accelerate the beginning of the charge of the condensers, adjusting means connected with the screens of the first mentioned tubes for adjusting the screen voltages thereof, so as to determine the plate currents thereof, coupling means for connecting the first oscillator device with the second, the respective condensers of these oscillator devices being chosen of different capacities so as to obtain the desired ratio of the respective frequencies of said oscillator devices, means for transmitting the voltage from the first oscillator device to the second, a single means for feeding a potential to the means provided for adjusting the screen voltages of the first mentioned tubes of said oscillator devices.
  • means for superimposing a standard alternating voltage on the output of the final oscillator device means for detecting the tops of the curves corresponding to the superimposed voltages, and. means for causing the voltage thereby obtained to act on at least one component of the oscillator devices.
  • a system for generating oscillations espe- 10 cially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to discharge through the first mentioned tube and to he suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliery tube connected to accelerate the beginning of the charge of the condenser, potentiometers connected with the screens of the first mentioned tubes for adjusting the screen voltages thereof, so as to determine the plate currents thereof, coupling means for connecting one of the oscillator devices with the other, the respective condensers of these oscillator devices being chosen of difierent capacities so as to obtain the desired ratio of the respective frequen cies of said oscillator devices, means for transmitting the voltage from one oscillator device to the other, a single means for feeding the potentiometers provided for adjusting the screen voltages of the first mentioned
  • a system for generating oscillations especially intended for television which comprises, in combination, at least two oscillator devices, each oscillator device including a pentode tube, another tube arranged to be periodically polarized, a condenser connected with said tubes in a manner to slowly discharge through the first mentioned tube and to be suddenly charged through the second mentioned tube when the latter is not blocked by polarization, an auxiliary tube connected to accelerate the beginning of the charge of the condenser, potentiometers connected with the screens of the first mentioned tubes for adjusting the screen voltages thereof, so as to determine the plate currents thereof, coupling means for connecting one of the oscillator devices with the other, the respective condensers of these oscillator devices being chosen of difierent capacities so as to obtain the desired ratio of the respective frequencies of said oscillator devices, means for transmitting the voltage from one oscillator device to the other, a single potentiometer for feeding a potential to the potentiometers provided for adjusting the screen voltages of the first mentioned tubes of said oscillator devices
  • a system for producing oscillations which comprises, in combination, a plurality of oscillator devices interconnected with one another so that the frequency of one depends upon the frequenc of the preceding one, at least one oscillograph, means coupling the plates of said 0scillograph with at least two of said oscillators, means for superimposing a standard alternating voltage on the output of the final oscillator de vice, means for detecting the tops of the curve corresponding to the superimposed voltages, and

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Details Of Television Scanning (AREA)
  • Particle Accelerators (AREA)
US464750A 1941-03-12 1942-11-06 Stable frequency conversion system Expired - Lifetime US2420303A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR232477X 1941-03-12
FR50741X 1941-07-05

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US2420303A true US2420303A (en) 1947-05-13

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CH (1) CH232477A (fr)
DE (1) DE966446C (fr)
GB (1) GB630871A (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477076A (en) * 1945-10-12 1949-07-26 Bell Telephone Labor Inc Frequency control system
US2480599A (en) * 1945-11-30 1949-08-30 Oxford Alan John Henry Interference suppression system for radio receivers and the like
US2492018A (en) * 1944-11-11 1949-12-20 Philco Corp Synchronizing system for sawtooth wave generators
US2517703A (en) * 1947-07-25 1950-08-08 Franklin F Offner Synchronizing apparatus
US2522124A (en) * 1947-10-08 1950-09-12 Bell Telephone Labor Inc Frequency-controlled oscillator
US2553059A (en) * 1945-08-08 1951-05-15 Chrysler Corp Synchronizer
US2593842A (en) * 1947-08-13 1952-04-22 Du Mont Allen B Lab Inc Phase discriminator
US2604515A (en) * 1946-10-17 1952-07-22 Bendix Aviat Corp Electrical circuit analyzing apparatus
US2633555A (en) * 1947-09-27 1953-03-31 Beam deflection control
US2674812A (en) * 1950-04-05 1954-04-13 Gen Precision Lab Inc Pattern target display
US2694160A (en) * 1948-08-31 1954-11-09 Bell Telephone Labor Inc Expandable straight line trajectory radar and sonar indicator
US2745099A (en) * 1951-05-10 1956-05-08 Waldon P Bollinger Sweep modulator direction finder
US2997662A (en) * 1947-07-09 1961-08-22 Wendell R Garner Noise frequency-modulated pulse generator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978684A (en) * 1928-11-09 1934-10-30 Associated Electric Lab Inc Television
US2114938A (en) * 1933-05-05 1938-04-19 Cossor Ltd A C Condenser relaxation circuit
US2175033A (en) * 1938-05-18 1939-10-03 Loewe Opta Gmbh Picture transmission
US2212648A (en) * 1939-01-28 1940-08-27 Rca Corp Synchronizing pulse generator
US2245627A (en) * 1938-06-24 1941-06-17 Univ Leland Stanford Junior Stabilization of frequency

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978684A (en) * 1928-11-09 1934-10-30 Associated Electric Lab Inc Television
US2114938A (en) * 1933-05-05 1938-04-19 Cossor Ltd A C Condenser relaxation circuit
US2175033A (en) * 1938-05-18 1939-10-03 Loewe Opta Gmbh Picture transmission
US2245627A (en) * 1938-06-24 1941-06-17 Univ Leland Stanford Junior Stabilization of frequency
US2212648A (en) * 1939-01-28 1940-08-27 Rca Corp Synchronizing pulse generator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492018A (en) * 1944-11-11 1949-12-20 Philco Corp Synchronizing system for sawtooth wave generators
US2553059A (en) * 1945-08-08 1951-05-15 Chrysler Corp Synchronizer
US2477076A (en) * 1945-10-12 1949-07-26 Bell Telephone Labor Inc Frequency control system
US2480599A (en) * 1945-11-30 1949-08-30 Oxford Alan John Henry Interference suppression system for radio receivers and the like
US2604515A (en) * 1946-10-17 1952-07-22 Bendix Aviat Corp Electrical circuit analyzing apparatus
US2997662A (en) * 1947-07-09 1961-08-22 Wendell R Garner Noise frequency-modulated pulse generator
US2517703A (en) * 1947-07-25 1950-08-08 Franklin F Offner Synchronizing apparatus
US2593842A (en) * 1947-08-13 1952-04-22 Du Mont Allen B Lab Inc Phase discriminator
US2633555A (en) * 1947-09-27 1953-03-31 Beam deflection control
US2522124A (en) * 1947-10-08 1950-09-12 Bell Telephone Labor Inc Frequency-controlled oscillator
US2694160A (en) * 1948-08-31 1954-11-09 Bell Telephone Labor Inc Expandable straight line trajectory radar and sonar indicator
US2674812A (en) * 1950-04-05 1954-04-13 Gen Precision Lab Inc Pattern target display
US2745099A (en) * 1951-05-10 1956-05-08 Waldon P Bollinger Sweep modulator direction finder

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Publication number Publication date
CH232477A (fr) 1944-05-31
GB630871A (en) 1949-10-24
DE966446C (de) 1957-08-08

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