US2468085A - Two-way pulse multichannel system employing cathode-ray tube modulators - Google Patents

Two-way pulse multichannel system employing cathode-ray tube modulators Download PDF

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Publication number
US2468085A
US2468085A US692879A US69287946A US2468085A US 2468085 A US2468085 A US 2468085A US 692879 A US692879 A US 692879A US 69287946 A US69287946 A US 69287946A US 2468085 A US2468085 A US 2468085A
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US
United States
Prior art keywords
terminal
pulses
circuit
ray tube
pulse
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US692879A
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English (en)
Inventor
Labin Emile
Donald D Grieg
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Federal Telecommunication Laboratories Inc
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Federal Telecommunication Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE477244D priority Critical patent/BE477244A/xx
Application filed by Federal Telecommunication Laboratories Inc filed Critical Federal Telecommunication Laboratories Inc
Priority to US692879A priority patent/US2468085A/en
Priority to GB22605/47A priority patent/GB628683A/en
Priority to CH262685D priority patent/CH262685A/de
Priority to FR57671D priority patent/FR57671E/fr
Priority to FR57776D priority patent/FR57776E/fr
Priority to ES0182349A priority patent/ES182349A1/es
Application granted granted Critical
Publication of US2468085A publication Critical patent/US2468085A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/045—Distributors with CRT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J7/00—Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels

Definitions

  • This invention relates to multi-channel communication systems and more particularly to multi-channel systems employing multiplex modulators and demodulators or the cathode ray tube type.
  • the pulses are derived from a single sinusoidal type base wave by means of a multiple channel modulating tube of the cathode ray type, and the intelligence is recovered from the respective pulses by a multiple channel demodulating tube, also of the cathode ray type.
  • the respective terminals for transmitting and receiving normally include in the case of the transmitter a base wave oscillator, a phaser, a multiple channel modulating cathode ray tube, and anoutput circuit leading to the transmitter; and in the case of the receiver include a width discrirninz'ltor for separating out the marker pulses, a base wave generator, a phaser, and a multiple channel demodulator cathode ray tube connecting to the variousA receiving channels.
  • a two-way multiple channel receiving and transmitting system including at each terminal a transmitter and receiver.
  • the system includes a stable koscillator at one terminal to provide the sweep potential for the multiple channel modulatorand demodu lator cathode ray tubes of such a terminal, the
  • the individual synchronizing channel being formed for instance, as one cf the channels of the transmitter or modulator tube.
  • the demodulator tube separates the signals of the different channels.
  • a synchronizing channel selector is also provided to isolate the pulses of the synchronizing channel so as to control a generator which provides the sweep potential for the demodulating and modulating tubes of that termlnal.
  • the return transmission circuit does not include a synchronizing channel since the oscillator of the first terminal controls the demodulating tube of that terminal.
  • one to four base wave generators may be employed in this system, that is, one such generator may synchronize any one or more of the demodulator or modulator circuits oi the system as a whole.
  • delay devices may be inserted at suitable points of the receiver circuit of the second terminal.
  • Fig. l illustrates partly in block and partly in diagrammatic form, a transmitting and receiving terminal in accordance with the invention, details of a multiple channel modulating tube circuitbeing shown;
  • Fig. 1A indicates in graphic form a typical group of pulses for multiple channel communication
  • Fig. I2 l shows partly in block and partly in diagrammatic form, the secondary terminal of the system, the multiple channel demodulating tube being shown in detail.
  • the terminal illustrated in Fig. 1 comprises a multiple channel de'modulaftor tube I which is of the cathode ray tube type, as described in detail in our above-defined co-pending application Serial No. 567,414 which produces and modulates a group of time modulated pulses in accordance with those shown in Fig. 1A.
  • the tube l includes an electron gun assembly 2, the resulting electron beam being deected in a given pattern while passing intermediate a set of horizontal and ver tical deection plates 3.
  • the electron beam is 3 made to traverse a circular path in respect to a target or anode assembly comprising an apertured barrier plate 4, a modulating system 5, a pulse time modulator plate 6, and a so-called dynode or secondary emission anode 1.
  • the circular deflection of the beam with respect to the target assembly is obtained by means of two sinusoidal waves which are phased 90 with respect to one another and which are obtained from a base wave oscillator or generator 8 and a phaser ampliner circuit 9, connected to apply the phased voltages to the vertical and horizontal deflection plates 3.
  • the' barrier plate 4 includes radially disposed apertures IU which serve to interrupt or chop up the electron beam as it travels past in a circle and passes therethrough toward the dynode target 1 between the modulating ele- ⁇ ments I I of the modulator system and through apertures I2 of the modulator plate 6.
  • Each of the modulating elements II is connected to one ⁇ of the modulating signal channels I3 through a coupling transformer I4.
  • the amplitude modulated signal voltage is applied through the transormers Iii to the deflecting portions II of the modulating system 5 to cause radial displacement of the electron beam to take place in accordance with the signal voltage at the elements II.
  • the apertures I2 of the modulating plate 6 are shaped in such a mannerthat any radial displacement of the beam toward or away from the center of the circle described thereby results in a displacement in time of the pulse generated by the beam impinging on the dynode 1 in the output circuit indicated at I5..
  • On'e of the apertures l2 is shaped such as to produce a somewhat wider pulse which serves as a marker or a synchronizing impulse for each groupof pulses for any complete circular travel of the beam.
  • a representative group of such pulses including a marker pulse is indicated in Fig. 1A, the marker pulse being indicated at I6 and intelligence carrying pulses I1 are Ishown to be variable in position, that is in tune, Within a given range, such range being xed as to relative distance from the marker pulse lfor ach of the respective channels.
  • the time modulated pulses of the various channels are collected and applied to a cathode follower I8 and a transmitter circuit i9 for transmission to the opposite terminal.
  • a receiver is shown in block form at 2D as connected to the output terminals of the phaser circuit 9 indicating the community of the base wave generator or oscillator 8 for both the transmitter and receiver of the terminal. Details of the receiver circuit 2l! will be described in connection with Fig. 2.
  • the terminal illustrated therein comprises a receiver-detector circuit 2I which, after the pulses have been detected therein, feeds them into a width discriminator circuit 22 wherein the marker pulse is isolated and made to trigger a synchronizing base wave in a generator circuit 23.
  • the base wave which is of a sinusoidal character is applied to a phase shifter 24 which serves to derive two sinusoidal waves 90 apart and which are applied -to the vertical and horizontal deection plates 25, respectively, to cause a circular deection of an electron beam produced in electron beam assembly 26 of a demodulator tube 21.
  • the multiple channel demodulating tube details of which have been described in the above-referred to Vapplica-- tion, Serial No. 565,152, also includes a barrier tained from the respective targets for the various circuits for the various channels.
  • the time modulated pulses acting to key the electron beam on and off according to the leading and trailing edges of the pulses, are applied to one of the control grids 30 of the tube 21 from the receiver .2
  • a transmitter circuit indicated at 32 is connected to be supplied with the time modulated multi-channel pulse group from a multi-channel modulator circuit 33 which receives ⁇ its controlling sweep voltage from the base wave generator 23 in the receiver circuit by way of a suitable delay circuit 34, and is modulated from associated signal channels.
  • the transmitter circuit 32--33 is otherwise anal- ⁇ ogous to the one described in connection with Fig. l except that it does not include a synchronizing marker pulse channel because of the presence of the oscillator 8 which controls the modulator tube of the first-described terminal.
  • the delay circuit 34 is added so as to maintain the synchronous relationship between the terminals which is otherwise disturbed due to the transmission time lag.
  • the receiver 20 of the terminal illustrated in Fig. 1 is analogous to the receiver and demodulator circuits of Fig. 2 and may or may not include a delay line in preference to the delay line incorporated in the circuit of Fig. 2.
  • pulses modulated in time in accordance with the respective signals in the various channels I3 are emitted in the form of a pulse train by transmitter I9 including suitable marker or synchronizing pulses as indicated at I6 in Fig. 1A.
  • the synchronizing pulses thereof are isolated in the discriminator circuit 22 and applied to the base wave generator 23 for triggering the same to generate a sinusoidal wave which serves to provide the deiiecting voltages for the circular path of the electron beam in the demodulator tube 21.
  • the detected time modulated pulses are at fthe same time applied to the control grid 30 of the tube 21 to provide on and oir keying of the beam whereby amplitude modulated pulses are obtained in the output circuits of the targets 29 and the nnal audio signal in the respective circuits 3
  • the base wave of the generator ⁇ 23 obtained as a result of the marker pulse received also serves to synchronize the modulating tube circuit 33 of the transmitter 32, a delay in the phase of the wave being required.
  • the transmitter circuit 32 shown in Fig. 2 and the receiver circuit 2n shown in Fig. 1 are also analogous to those described in detail in Figs.
  • Fig. 1 which serves to provide the basic synchronization of the entire system. It is, however, contemplated fto' use oscillators for any one or all of the transmitters or receivers of the two terminals, instead of employing one oscillator or wave generator 8 as described. A separate wave generator or oscillator may also be employed for controlling each terminal.
  • an oscillator located in the transmitter circuit 32 of the terminal described in Fig. 2 will be connected to both the multi-channel modulator circuit 33 and to the sweep circuit of the demodulator 21.
  • a variable delay device will be inserted between the oscillator of the modulator circuit and the demodulator in the second terminal.
  • a base wave oscillator being used only in one terminal, it becomes unnecessary to provide in the return transmission for a synchronizing or marking pulse channel as will be understood by inspection.
  • the rst of said terminals including means responsive to the control wave for producing a synchronizing pulse interspaced between the multichannel signal pulses and transmitted along said communication medium, and the second ofl said terminals including means for separating said synchronizing rst terminal.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Small-Scale Networks (AREA)
US692879A 1944-12-09 1946-08-24 Two-way pulse multichannel system employing cathode-ray tube modulators Expired - Lifetime US2468085A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE477244D BE477244A (en(2012)) 1946-08-24
US692879A US2468085A (en) 1946-08-24 1946-08-24 Two-way pulse multichannel system employing cathode-ray tube modulators
GB22605/47A GB628683A (en) 1946-08-24 1947-08-14 Electric multi-channel two-way pulse communication system
CH262685D CH262685A (de) 1946-08-24 1947-08-22 Zweigweganlage zur Mehrkanalübertragung mittels zeitmodulierter Impulse.
FR57671D FR57671E (fr) 1944-12-09 1947-08-22 Perfectionnements aux systèmes de transmission de signaux électriques
FR57776D FR57776E (fr) 1944-12-09 1947-10-02 Perfectionnements aux systèmes de transmission de signaux électriques
ES0182349A ES182349A1 (es) 1946-08-24 1948-02-13 MEJORAS EN SISTEMAS DE COMUNICACIoN MULTICANAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US692879A US2468085A (en) 1946-08-24 1946-08-24 Two-way pulse multichannel system employing cathode-ray tube modulators

Publications (1)

Publication Number Publication Date
US2468085A true US2468085A (en) 1949-04-26

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US692879A Expired - Lifetime US2468085A (en) 1944-12-09 1946-08-24 Two-way pulse multichannel system employing cathode-ray tube modulators

Country Status (5)

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US (1) US2468085A (en(2012))
BE (1) BE477244A (en(2012))
CH (1) CH262685A (en(2012))
ES (1) ES182349A1 (en(2012))
GB (1) GB628683A (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540834A (en) * 1946-12-13 1951-02-06 Bell Telephone Labor Inc Electron discharge device
US2548789A (en) * 1948-12-08 1951-04-10 Raytheon Mfg Co Electronic storage device
US2576093A (en) * 1946-08-10 1951-11-27 Int Standard Electric Corp Cathode-ray tube circuit
US2607903A (en) * 1947-11-10 1952-08-19 Int Standard Electric Corp Distributor tube construction
US2974313A (en) * 1958-09-18 1961-03-07 Louis W Parker Multiple reading instruments and systems for remote indication

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185693A (en) * 1938-02-25 1940-01-02 Bell Telephone Labor Inc Multiplex signaling system
US2265216A (en) * 1938-04-23 1941-12-09 Hartford Nat Bank & Trust Co Multiplex telephony system
US2395467A (en) * 1943-10-19 1946-02-26 Standard Telephones Cables Ltd Multiplex telephone system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185693A (en) * 1938-02-25 1940-01-02 Bell Telephone Labor Inc Multiplex signaling system
US2265216A (en) * 1938-04-23 1941-12-09 Hartford Nat Bank & Trust Co Multiplex telephony system
US2395467A (en) * 1943-10-19 1946-02-26 Standard Telephones Cables Ltd Multiplex telephone system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576093A (en) * 1946-08-10 1951-11-27 Int Standard Electric Corp Cathode-ray tube circuit
US2540834A (en) * 1946-12-13 1951-02-06 Bell Telephone Labor Inc Electron discharge device
US2607903A (en) * 1947-11-10 1952-08-19 Int Standard Electric Corp Distributor tube construction
US2548789A (en) * 1948-12-08 1951-04-10 Raytheon Mfg Co Electronic storage device
US2974313A (en) * 1958-09-18 1961-03-07 Louis W Parker Multiple reading instruments and systems for remote indication

Also Published As

Publication number Publication date
CH262685A (de) 1949-07-15
BE477244A (en(2012))
GB628683A (en) 1949-09-02
ES182349A1 (es) 1948-04-01

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