US2288554A - Synchronizing system and method - Google Patents
Synchronizing system and method Download PDFInfo
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- US2288554A US2288554A US337059A US33705940A US2288554A US 2288554 A US2288554 A US 2288554A US 337059 A US337059 A US 337059A US 33705940 A US33705940 A US 33705940A US 2288554 A US2288554 A US 2288554A
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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
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
- H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator
Definitions
- This invention relates to synchronizing circuits and in lparticularto synchronizing circuits as used in connection with television receivers and the like.
- the invention has for its generalobject toprovide a -gas discharge tube oscillator adapted to synchronize in response to pulses invented from exercising any control over the electron current in the tube. Accordingly, by the present invention, there is n provided in a synchronizable oscillator which eluded as a part of the composite televisionsignal, and which is not appreciably.
- the oscillator exhibits no appreciable tendency to fire orto be synchronized on pulsescontained inthe signal other than those on which it is intended to be so synchronized;for example, there is no tendency for the, oscillator tobe affected by the double frequency or "equalizing pulses sometimes includedin the television signal.
- a grid-controlled gas discharge tube to control the iiow Voi.' current from an electrical circuitvfor 'generating a sawtooth orlike wave form, means for quenching or blocking the input circuit of the gas tube whereby it is made entirely non-responsive to signals ci reasonable amplitude during its active period as well as during its passive period, said means comprising an impedance inserted in the cathode circuit of the vgas tube across which there is built -up a voltage which is effective to bias the tube oit at least throughout the active period.
- oscillators of the classl which includes the blocking oscillator-andthe like are characterized in that their cycles oifoperation may be periods. During the so-called inchoation period,
- the .oscillator issubject to being fired by an incoming synchronizing pulse; ⁇ During the active period, the tube which constitutes the heart of the oscillator is conducting ⁇ and signals applied tothe input are eiiective to iniiuence the magni-
- the invention will be understood by reference to the drawing, the two gures of which show certain embodiments of the invention.
- FIG. 1 there is shown an oscillatory device 4for generating a voltage oi 'substantially'.saw-
- AThe-circuit comprises a condenser 3 which is charged by a battery I4 through a resistor 5. Effectively in shunt with the condenser there is provided a grid controlled gas discharge device 2 to the grid .of which may be supplied from the source shown,
- the synchronizing pulses l I for controlling the operation of the oscillator.
- the oscillator just described 4' will oscillate at a frequency determined by characteristics Vof th'e gas discharge devicel.
- condenser will be charged to a point at which the the active period. This is accomplished, ini general, by feeding back a suitable signal from the output of the oscillator to block its input during the active period.
- a circuit is shown in which a signal is derived from the output of a gas tube oscillator and applied to block voltage on the plate oi.' the gas discharge device is vsuch as to cause it to conduct, at which time ⁇ the condenser will be discharged through its discharge path. 'I'he potential at which the device conducts will be dependent upon the voltage applied between. its grid and cathode.
- a pulse signal may be applied to the grid the input of Vor to -quench the'tube during its conductive period, so that although ionic conduction continues to take place the grid is preof the tube which will cause the tube immediately to conduct and to ⁇ discharge the condenser.
- an impedance comprising a' resistor shunted by a condenser, for developing a voltage whichl is such as appreciably to reduce the controlling eiect of the grid upon the operation of the device during a part oi' the interval between the successive synchronizing pulses which it is desired should actuate the gas discharge device.
- the condenser 9 is very small, for example not appreciably greater than the distributed capacity of the resistor 8, the voltagef developed across the'impedance combination will be a pulse signal substantially corresponding in duration to the current pulse in the gas discharge device occurring during .the discharge of the condenser 3.
- Such a voltage pulse is adapted to reduce the controlling eifect of the grid upon the current in the gas discharge device during this discharge period which is desirable since it will help to insure the peaks of the sawtooth voltage being of substantially constant amplitude. It may however be desirable to provide protection during a greater portion of the time interval between successive synchronizing pulses.
- the condenser may be made larger whereby the voltage developed across the combination will be of substantially sawtooth form as indicated by the broken line at I0.
- Such a quenching voltage is adapted to reducel the susceptibility of the gas dischargedevice toactuation by extraneous pulse signals occurring beztween the desired synchronizing pulses.
- Invparticular it may operate to exclude the undesirable v alternate double horizontal frequency pulses occurring before and after the vertical synchronizing pulse in the usual form of television synchronizing signal.
- the time constant of the combination comprising the resistor 8 and the condenser 9 should be of substantially the same order ofmagnitude as the time interval between successsiv'e synchronizingpulses. However it is to be understood that there may be considerable variation from this.
- apparatusl for gen--4 erating deflecting waveforms comprising a condenser across which said deflecting waveform is developed, means including a s ource of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode-and a control grid for resonant circuit comprising the inductance I3 A and the condenser Il is utilized for this purpose.
- 1 fIt will be noted that the rest of the circuit is substantially the same as thatshown in Fig. 1.
- the condenser i4 When the gas, discharge tube 2 is rendered conductive by means'of a synchronizing pulse ⁇ applied to its grid, the condenser i4 is suddenly charged tov a positive potential with respect to ground. Then, when the tube 2 ⁇ ceases to conduct due to reduction in its plate voltage brought ⁇ the frequency of occurrence ofthe synchronizing pulses which it is desired should actuate the gas discharge device the quenching voltage may be of the form shown at Il.
- this voltage will have decreased sufficiently by the time the next synchronizing pulse arrives to permit the gas discharge device to be actuated thereby, it is nevertheless' suflicently positive in the middle of the interval between successive pulses to exdischarging said condenser in response to pulse signals appled to the grid-cathode circuit of saidy device, a source of desired and undesired pulse signals coupled to said 'grid-cathode circuit, saidl desired pulse signals being substantially periodii cally recurrent, and impedance means connected' f 1n the Agrid-cathode circuit of saidgas-discharge device and responsive to a pulse v,offcurr'entprod uced therethrough in response to 'one of-said desired pulse signals for developing in said griding desired pulse signal but which is substantially dissipated prior .to the occurrence of sa'idffj next pulse signal, said voltage being ofrsuicient magnitude during said portion of the intervalt'o f substantially prevent the actuation ofs
- v'apparatus vfor'generating deflecting waveforms comprising ra condenser across which said Adeflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at L least an anode, a cathode and a control grid for discharging said condenser invresponse to pulse clude the undesired double frequency horizontal v pulse occurring between the desired synchronizing pulses and represented in the ligure by the signals applied to the grid-*cathode circuit of said device, a source of desired and undesired pulse signals coupledto said-grid-cathode circuit, said desired pulse signals being substantially periodically recurrent, and means comprising a resistor sired pulse signal but which issubstantially dissipated prior to the occurrenc'of .said next pulse signal, said voltage being of sulcient magnitude during said portion of theinterval to substantially prevent the
- apparatus for generating deflecting waveforms comprising a condenser across which saidjdectingwaveform is -for charging said condensenmeans including a grid-controlled gas-discharge device having at least an anode, a cathode and a control grid for discharging said condenser in response to pulse signals.
- a source of desired and undesiredA i 2,288,554 developed, means including a source of voltagev l constant of the order of magnitude of the interi vals between successive desired pulse signals and being adapted to respond to a pulse of current produced through said device in response to one of said desired pulse signals, for developing in said gri'd-cathode circuity a voltage which persists throughout a substantial portion of the interval between said desired pulse signal and thev next -succeeding desired pulse signal but which is substantially dissipated 'prior to the occurrence of said next pulse signal, said voltage being v ⁇ of sufficient magnitude during said portion of y the interval to substantially prevent the actuation ofsaid gas-discharge device by said undesired pulse signals.
- apparatus for generating deflecting waveforms comprising a -condenser across which "said deflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode and a control Vgrid for' discharging said condenser in response to pulse signals applied to the grid-cathode circuit of said device, a source of desired and undesired pulse.V
- said desired pulse signals being substantially periodically recurrentand means comprising a parallel resonant circuit included in the grid-cathode circuit of said gas-discharge'device and responsive to a pulse of current produced 'therethrough in f response to one of said desired pulse signals for developing in saidgrid-cathode circuit a voltage which persists throughout a substantial portion 'of thelinterval between said desired pulse signal and the next succeeding'desired pulse signal but which ⁇ is substantially dissipated prior to the occurrenceof said next pulse signal, said voltage being of sufficient magnitude during said portion a voltage which persists throughout a substantial' portion of the interval between said-desired pulsesignal and the next succeeding desired pulse signal butiwhich is substantially dissipated 'prior to the occurrence of said next pulse signal, said voltage being of suiiioient magnitude during said,
- apparatus for generating deflecting waveforms comprising a condenser across which said deflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode and a control grid for discharging said condenser in response to pulse signals applied to thexgrid-cathode circuit of said device, a source of desired and undesired pulse vsignals coupled to said grid-cathode circuit, said desired pulse signals being substantially periodically recurrent, and impedance means connected in the ⁇ grid-cathode circuit of said.
- apparatus for generating deflecting waveforms comprising a condenser across which said deflecting waveform is developed, means including a source of voltage for charging saidcondenser; means including a gridcontrolled gas-discharge device havingat least -an anode, a cathode and a control grid for discharging said condenser in response to pulse signals applied to the grid-cathode circuit of 'said device, a source of desired and undesired pulse signals coupled vto said grid-cathode circuit, said desired pulse signals being substantially periodically recurrent and said undesired vpulse sig- -nals including pulses.
- apparatus for generating deflecting waveforms comprising a condenser across which said deflecting waveform is developed, means for alternately charging and discharging said condenser, said means including,
- a grid-controlled space discharge device having at least an anode, a cathode and a control grid andbeing adapted for actuation by pulse signals
- said voltage being of sufcient magnitude during said portion of the interval to substantially prevent the actuation of said space discharge device by said undesired pulse signals.
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Description
June 30, 1942. N, F SMITH, JR 2,288,554A
sYNcHRoNIzNG sYsmEM'AND METHOD Filed May 24; 1940 pulses.
Patented June 30, 1942 sYNcnnomzmG SYSTEM AND iun'rnonV Newland F. Smith, Jr., Wyndmoor, Pa., assignor to. Philco Radio and Television Corporation, Philadelphia, Pa., a corporation of Delaware Application May 24, 1940, Serial No. 337,059
' l In Great Britain June 5,1939.
s claims. (c1. 17a-69.5)
This invention relates to synchronizing circuits and in lparticularto synchronizing circuits as used in connection with television receivers and the like. The invention has for its generalobject toprovide a -gas discharge tube oscillator adapted to synchronize in response to pulses invented from exercising any control over the electron current in the tube. Accordingly, by the present invention, there is n provided in a synchronizable oscillator which eluded as a part of the composite televisionsignal, and which is not appreciably. aiected inits operation bythe 'presence of undesired noise Furthermore, the oscillator exhibits no appreciable tendency to fire orto be synchronized on pulsescontained inthe signal other than those on which it is intended to be so synchronized;for example, there is no tendency for the, oscillator tobe affected by the double frequency or "equalizing pulses sometimes includedin the television signal.
employs a grid-controlled gas discharge tube to control the iiow Voi.' current from an electrical circuitvfor 'generating a sawtooth orlike wave form, means for quenching or blocking the input circuit of the gas tube whereby it is made entirely non-responsive to signals ci reasonable amplitude during its active period as well as during its passive period, said means comprising an impedance inserted in the cathode circuit of the vgas tube across which there is built -up a voltage which is effective to bias the tube oit at least throughout the active period.
In copending application of Frank J. Bingley,
Serial No'. 224,646. filed Aug.12,"1938, it is pointed out that oscillators of the classl which includes the blocking oscillator-andthe like are characterized in that their cycles oifoperation may be periods. During the so-called inchoation period,
the .oscillator issubject to being fired by an incoming synchronizing pulse;` During the active period, the tube which constitutes the heart of the oscillator is conducting` and signals applied tothe input are eiiective to iniiuence the magni- The invention will be understood by reference to the drawing, the two gures of which show certain embodiments of the invention.
In Fig. 1 there is shown an oscillatory device 4for generating a voltage oi 'substantially'.saw-
'- tooth wave form timed by means of substantially divided into three periods, which 4may be referred i to as the active, the passive and the inchoationl tude and energyfcontent of the signal produced Y in the output circuitv of the oscillator. During the passive period', the tube is cut off and is incapable of being' fired by any signal of reasonable magnitude applied 'to its input. aforementioned application, there are disclosed cer'tain methods of and means for preventing the i signal developed in the output' circuits of such oscillators from being iniiu'enced by noise and other signals applied to the input circuits during In the periodically recurrent pulse signals. AThe-circuit comprises a condenser 3 which is charged by a battery I4 through a resistor 5. Effectively in shunt with the condenser there is provided a grid controlled gas discharge device 2 to the grid .of which may be supplied from the source shown,
the synchronizing pulses l I for controlling the operation of the oscillator. In the 'absence of synchronizing pulses, the oscillator just described 4' will oscillate at a frequency determined by characteristics Vof th'e gas discharge devicel. The
, condenser will be charged to a point at which the the active period. This is accomplished, ini general, by feeding back a suitable signal from the output of the oscillator to block its input during the active period.
Further, inthe said appncation it is observed that the principles might be extended and ap plied to synchronizable oscillators employing grid-controlled gasdischarge tubes. In Fig.. 13, of the said application for example, a circuit is shown in which a signal is derived from the output of a gas tube oscillator and applied to block voltage on the plate oi.' the gas discharge device is vsuch as to cause it to conduct, at which time` the condenser will be discharged through its discharge path. 'I'he potential at which the device conducts will be dependent upon the voltage applied between. its grid and cathode. Thus when a synchronizing pulse of positive polarity l isapplied to the grid of the tube the plate voltage necessary to cause the tube to conduct will b'e reduced to an extent dependent upon the magnitude of the pulse signal. VAssuming that the condenser has been charged for an appreciable time, a pulse signal may be applied to the grid the input of Vor to -quench the'tube during its conductive period, so that although ionic conduction continues to take place the grid is preof the tube which will cause the tube immediately to conduct and to` discharge the condenser. There is also provided inthe cathode circuit of the gas discharge device in accordance with the,
invention an impedance comprising a' resistor shunted by a condenser, for developing a voltage whichl is such as appreciably to reduce the controlling eiect of the grid upon the operation of the device during a part oi' the interval between the successive synchronizing pulses which it is desired should actuate the gas discharge device. If the condenser 9 is very small, for example not appreciably greater than the distributed capacity of the resistor 8, the voltagef developed across the'impedance combination will be a pulse signal substantially corresponding in duration to the current pulse in the gas discharge device occurring during .the discharge of the condenser 3. Such a voltage pulse is adapted to reduce the controlling eifect of the grid upon the current in the gas discharge device during this discharge period which is desirable since it will help to insure the peaks of the sawtooth voltage being of substantially constant amplitude. It may however be desirable to provide protection during a greater portion of the time interval between successive synchronizing pulses. With this in mind the condenser may be made larger whereby the voltage developed across the combination will be of substantially sawtooth form as indicated by the broken line at I0. Such a quenching voltage is adapted to reducel the susceptibility of the gas dischargedevice toactuation by extraneous pulse signals occurring beztween the desired synchronizing pulses. Invparticular it may operate to exclude the undesirable v alternate double horizontal frequency pulses occurring before and after the vertical synchronizing pulse in the usual form of television synchronizing signal. In general the time constant of the combination comprising the resistor 8 and the condenser 9 should be of substantially the same order ofmagnitude as the time interval between successsiv'e synchronizingpulses. However it is to be understood that there may be considerable variation from this.
Other impedance combinations may be employed for the purpose of broadening the impulse of quenching voltage developed in the cathode and circuit. For example in Fig. 2 a
`the cathode circuit of the gas discharge device the desired quenching voltage. Other impedance combinations will occur to those skilled in the art suitable for obtaining the results desired in accordance with the principles herein set forth. f
I claim:
l. In a television system, apparatusl for gen--4 erating deflecting waveforms, comprising a condenser across which said deflecting waveform is developed, means including a s ource of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode-and a control grid for resonant circuit comprising the inductance I3 A and the condenser Il is utilized for this purpose. 1 fIt will be noted that the rest of the circuit is substantially the same as thatshown in Fig. 1. When the gas, discharge tube 2 is rendered conductive by means'of a synchronizing pulse `applied to its grid, the condenser i4 is suddenly charged tov a positive potential with respect to ground. Then, when the tube 2` ceases to conduct due to reduction in its plate voltage brought` the frequency of occurrence ofthe synchronizing pulses which it is desired should actuate the gas discharge device the quenching voltage may be of the form shown at Il. Although this voltage will have decreased sufficiently by the time the next synchronizing pulse arrives to permit the gas discharge device to be actuated thereby, it is nevertheless' suflicently positive in the middle of the interval between successive pulses to exdischarging said condenser in response to pulse signals appled to the grid-cathode circuit of saidy device, a source of desired and undesired pulse signals coupled to said 'grid-cathode circuit, saidl desired pulse signals being substantially periodii cally recurrent, and impedance means connected' f 1n the Agrid-cathode circuit of saidgas-discharge device and responsive to a pulse v,offcurr'entprod uced therethrough in response to 'one of-said desired pulse signals for developing in said griding desired pulse signal but which is substantially dissipated prior .to the occurrence of sa'idffj next pulse signal, said voltage being ofrsuicient magnitude during said portion of the intervalt'o f substantially prevent the actuation ofsaid gasdischarge device by said undesired pulse signals.
2. In a television system, v'apparatus vfor'generating deflecting waveforms, comprising ra condenser across which said Adeflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at L least an anode, a cathode and a control grid for discharging said condenser invresponse to pulse clude the undesired double frequency horizontal v pulse occurring between the desired synchronizing pulses and represented in the ligure by the signals applied to the grid-*cathode circuit of said device, a source of desired and undesired pulse signals coupledto said-grid-cathode circuit, said desired pulse signals being substantially periodically recurrent, and means comprising a resistor sired pulse signal but which issubstantially dissipated prior to the occurrenc'of .said next pulse signal, said voltage being of sulcient magnitude during said portion of theinterval to substantially prevent the actuation of said gas-discharge device by said undesired pulse signals.
3.v In a television system, apparatus for generating deflecting waveforms, comprising a condenser across which saidjdectingwaveform is -for charging said condensenmeans including a grid-controlled gas-discharge device having at least an anode, a cathode and a control grid for discharging said condenser in response to pulse signals. applied to the grid-cathode circuit of said device, a source of desired and undesiredA i 2,288,554 developed, means including a source of voltagev l constant of the order of magnitude of the interi vals between successive desired pulse signals and being adapted to respond to a pulse of current produced through said device in response to one of said desired pulse signals, for developing in said gri'd-cathode circuity a voltage which persists throughout a substantial portion of the interval between said desired pulse signal and thev next -succeeding desired pulse signal but which is substantially dissipated 'prior to the occurrence of said next pulse signal, said voltage being v`of sufficient magnitude during said portion of y the interval to substantially prevent the actuation ofsaid gas-discharge device by said undesired pulse signals.
4. In a television system, apparatus for generating deflecting waveforms, comprising a -condenser across which "said deflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode and a control Vgrid for' discharging said condenser in response to pulse signals applied to the grid-cathode circuit of said device, a source of desired and undesired pulse.V
signals coupled to said grid-cathode circuit, said desired pulse signals being substantially periodically recurrentand means comprising a parallel resonant circuit included in the grid-cathode circuit of said gas-discharge'device and responsive to a pulse of current produced 'therethrough in f response to one of said desired pulse signals for developing in saidgrid-cathode circuit a voltage which persists throughout a substantial portion 'of thelinterval between said desired pulse signal and the next succeeding'desired pulse signal but which` is substantially dissipated prior to the occurrenceof said next pulse signal, said voltage being of sufficient magnitude during said portion a voltage which persists throughout a substantial' portion of the interval between said-desired pulsesignal and the next succeeding desired pulse signal butiwhich is substantially dissipated 'prior to the occurrence of said next pulse signal, said voltage being of suiiioient magnitude during said,
portion of the interval to substantially prevent theV actuation of said gas-discharge device by said unv desiredpulse signals. v
6. In'a vtelevision system, apparatus for generating deflecting waveforms, comprising a condenser across which said deflecting waveform is developed, means including a source of voltage for charging said condenser, means including a grid-controlled gas-discharge device having at least an anode, a cathode and a control grid for discharging said condenser in response to pulse signals applied to thexgrid-cathode circuit of said device, a source of desired and undesired pulse vsignals coupled to said grid-cathode circuit, said desired pulse signals being substantially periodically recurrent, and impedance means connected in the `grid-cathode circuit of said. gasdischarge device and responsive to a pulse of current produced therethrough in response to one of said desired` pulse signals 'for developing in` said grid-cathode circuit a voltage impulse of substantially greater duration than the current impulse producing it whereby it is effective during a substantial portion of the interval between said desired pulses to prevent the actuation of said gas-discharge device-by undesired pulse signals.
7. In a television system, apparatus for generating deflecting waveforms, comprising a condenser across which said deflecting waveform is developed, means including a source of voltage for charging saidcondenser; means including a gridcontrolled gas-discharge device havingat least -an anode, a cathode and a control grid for discharging said condenser in response to pulse signals applied to the grid-cathode circuit of 'said device, a source of desired and undesired pulse signals coupled vto said grid-cathode circuit, said desired pulse signals being substantially periodically recurrent and said undesired vpulse sig- -nals including pulses. of amplitude comparable tol said desired pulses, occurring in the intervals between said*` desired -pulses and lsubstantially equally spaced with respect to adjacent desired pulses, and impedance means connected in gridcathode circuit of said gas-discharge device vand responsive to a pulse of cui-rent produced therethrough fin response to one of said desired pulse signals for developing in said grid-cathode circuit i a voltage which persists throughoutv a substantial portion ofthe interval between said desired Y pulse signal and the next succeeding desired pulse discharging said condenser in response to pulse signalsapplied to thegrid-cathode circuit of said device, a source of desired and undesired pulse signals coupled to said grid-cathode circuit, said desired pulse signals being substantially periodically recurrent, and aparallel resonant circuit included in the grid-cathode lcircuit o f said gas-discharge device, said resonant circuit being tuned to a frequency lower than that at whichsaid desiredlpulse signalsoccur and being adaptedto respond to a pulse of current produced through said device in response to one of said desired pulse signals, for developing in said grid-cathode circuit signal but whichis substantially dissipated prior to the occurrence of said next pulse signal, said voltage being of .s ufiicient magnitude during said vportion of the interval to substantially prevent the lactuation of said gas-'discharge device by said undesired pulse signals.
8. In a television system, apparatus for generating deflecting waveforms, comprising a condenser across which said deflecting waveform is developed, means for alternately charging and discharging said condenser, said means including,
v a grid-controlled space discharge device having at least an anode, a cathode and a control grid andbeing adapted for actuation by pulse signals,
' a source of desired and undesired pulse signals coupled to the grid-cathode circuit of said device, said desired pulse signals being substantially periodically recurrent, and impedance means connected in the grid-cathode circuit of said space discharge device and responsive to a pulse of current produced therethrough in response to one of said desired pulse signals for developing in said grid-cathode circuit a voltage which persists 5 throughout a substantial portion o! the interval between said desired pulse signal and the next succeeding desired pulse signal but which is suinstantially dissipated prior to the occurrence of said next pulse signal. said voltage being of sufcient magnitude during said portion of the interval to substantially prevent the actuation of said space discharge device by said undesired pulse signals.
/ t NEWLAND F. SMITH, Jn.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB16438/39A GB530378A (en) | 1939-06-05 | 1939-06-05 | Improvements in and relating to synchronizing systems and methods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2288554A true US2288554A (en) | 1942-06-30 |
Family
ID=10077323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US337059A Expired - Lifetime US2288554A (en) | 1939-06-05 | 1940-05-24 | Synchronizing system and method |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2288554A (en) |
| GB (1) | GB530378A (en) |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2417070A (en) * | 1945-01-04 | 1947-03-11 | Oliver T Francis | Electronic time indicating device |
| US2422205A (en) * | 1943-10-05 | 1947-06-17 | Bell Telephone Labor Inc | Range indicator |
| US2441958A (en) * | 1944-07-17 | 1948-05-25 | Standard Telephones Cables Ltd | Communication system |
| US2443619A (en) * | 1945-02-08 | 1948-06-22 | Bell Telephone Labor Inc | Pulse generator of the shockexcited type |
| US2457176A (en) * | 1943-01-23 | 1948-12-28 | Standard Telephones Cables Ltd | Wave generating system |
| US2459667A (en) * | 1945-01-13 | 1949-01-18 | Westinghouse Electric Corp | Control circuits |
| US2462078A (en) * | 1944-09-15 | 1949-02-22 | Int Standard Electric Corp | Oscillation generator |
| US2464259A (en) * | 1944-05-11 | 1949-03-15 | Sperry Corp | Pulse circuits |
| US2493517A (en) * | 1942-07-24 | 1950-01-03 | Jr Alexander R Applegarth | Blocking oscillator |
| US2499613A (en) * | 1946-05-16 | 1950-03-07 | Stewart Warner Corp | Electronic pulse time interval discriminator with maximum interval gate |
| US2533285A (en) * | 1944-07-06 | 1950-12-12 | Sager Irving | Line pulse modulator |
| US2544531A (en) * | 1946-09-20 | 1951-03-06 | Hazeltine Research Inc | Relaxation type of electrical measuring system |
| US2549058A (en) * | 1949-01-07 | 1951-04-17 | James M Constable | Portable radiation detector |
| US2589851A (en) * | 1946-01-03 | 1952-03-18 | Us Sec War | Pulse length discriminator |
| US2595301A (en) * | 1945-08-10 | 1952-05-06 | Us Sec War | Line pulse modulator |
| US2597980A (en) * | 1947-06-24 | 1952-05-27 | English Electric Co Ltd | Electric circuit comprising electric discharge device |
| US2604516A (en) * | 1946-10-17 | 1952-07-22 | Bendix Aviat Corp | Electrical circuit analyzing apparatus |
| US2656465A (en) * | 1948-05-12 | 1953-10-20 | Zenith Radio Corp | Synchronizing system |
| US2700101A (en) * | 1946-04-19 | 1955-01-18 | Wallace | Panoramic device |
| US2704812A (en) * | 1949-05-26 | 1955-03-22 | Gen Electric | Synchronizing system |
| DE1006369B (en) * | 1953-10-28 | 1957-04-18 | Salzgitter Maschinen Ag | Device for influencing the feed rate of the drill in a rock drilling machine |
| US2798950A (en) * | 1955-07-05 | 1957-07-09 | Del Pro Corp | Pulse detecting network |
| US2807712A (en) * | 1943-09-02 | 1957-09-24 | Bell Telephone Labor Inc | Electronic systems |
| US2819392A (en) * | 1952-11-22 | 1958-01-07 | Itt | Sweep wave generator |
| US2832915A (en) * | 1950-02-03 | 1958-04-29 | Bendix Aviat Corp | Alarm system responsive to sonic vibrations |
| US2847573A (en) * | 1956-08-17 | 1958-08-12 | Ibm | Thyratron circuit |
| US2980905A (en) * | 1948-12-16 | 1961-04-18 | Joseph W Gratian | Radio ranging device |
-
1939
- 1939-06-05 GB GB16438/39A patent/GB530378A/en not_active Expired
-
1940
- 1940-05-24 US US337059A patent/US2288554A/en not_active Expired - Lifetime
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2493517A (en) * | 1942-07-24 | 1950-01-03 | Jr Alexander R Applegarth | Blocking oscillator |
| US2457176A (en) * | 1943-01-23 | 1948-12-28 | Standard Telephones Cables Ltd | Wave generating system |
| US2807712A (en) * | 1943-09-02 | 1957-09-24 | Bell Telephone Labor Inc | Electronic systems |
| US2422205A (en) * | 1943-10-05 | 1947-06-17 | Bell Telephone Labor Inc | Range indicator |
| US2464259A (en) * | 1944-05-11 | 1949-03-15 | Sperry Corp | Pulse circuits |
| US2533285A (en) * | 1944-07-06 | 1950-12-12 | Sager Irving | Line pulse modulator |
| US2441958A (en) * | 1944-07-17 | 1948-05-25 | Standard Telephones Cables Ltd | Communication system |
| US2462078A (en) * | 1944-09-15 | 1949-02-22 | Int Standard Electric Corp | Oscillation generator |
| US2417070A (en) * | 1945-01-04 | 1947-03-11 | Oliver T Francis | Electronic time indicating device |
| US2459667A (en) * | 1945-01-13 | 1949-01-18 | Westinghouse Electric Corp | Control circuits |
| US2443619A (en) * | 1945-02-08 | 1948-06-22 | Bell Telephone Labor Inc | Pulse generator of the shockexcited type |
| US2595301A (en) * | 1945-08-10 | 1952-05-06 | Us Sec War | Line pulse modulator |
| US2589851A (en) * | 1946-01-03 | 1952-03-18 | Us Sec War | Pulse length discriminator |
| US2700101A (en) * | 1946-04-19 | 1955-01-18 | Wallace | Panoramic device |
| US2499613A (en) * | 1946-05-16 | 1950-03-07 | Stewart Warner Corp | Electronic pulse time interval discriminator with maximum interval gate |
| US2544531A (en) * | 1946-09-20 | 1951-03-06 | Hazeltine Research Inc | Relaxation type of electrical measuring system |
| US2604516A (en) * | 1946-10-17 | 1952-07-22 | Bendix Aviat Corp | Electrical circuit analyzing apparatus |
| US2597980A (en) * | 1947-06-24 | 1952-05-27 | English Electric Co Ltd | Electric circuit comprising electric discharge device |
| US2656465A (en) * | 1948-05-12 | 1953-10-20 | Zenith Radio Corp | Synchronizing system |
| US2980905A (en) * | 1948-12-16 | 1961-04-18 | Joseph W Gratian | Radio ranging device |
| US2549058A (en) * | 1949-01-07 | 1951-04-17 | James M Constable | Portable radiation detector |
| US2704812A (en) * | 1949-05-26 | 1955-03-22 | Gen Electric | Synchronizing system |
| US2832915A (en) * | 1950-02-03 | 1958-04-29 | Bendix Aviat Corp | Alarm system responsive to sonic vibrations |
| US2819392A (en) * | 1952-11-22 | 1958-01-07 | Itt | Sweep wave generator |
| DE1006369B (en) * | 1953-10-28 | 1957-04-18 | Salzgitter Maschinen Ag | Device for influencing the feed rate of the drill in a rock drilling machine |
| US2798950A (en) * | 1955-07-05 | 1957-07-09 | Del Pro Corp | Pulse detecting network |
| US2847573A (en) * | 1956-08-17 | 1958-08-12 | Ibm | Thyratron circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB530378A (en) | 1940-12-11 |
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