US2418116A - Multiplex synchronizing system - Google Patents

Multiplex synchronizing system Download PDF

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Publication number
US2418116A
US2418116A US514998A US51499843A US2418116A US 2418116 A US2418116 A US 2418116A US 514998 A US514998 A US 514998A US 51499843 A US51499843 A US 51499843A US 2418116 A US2418116 A US 2418116A
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US
United States
Prior art keywords
pulses
channel
channels
synchronizing
trains
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Expired - Lifetime
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US514998A
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English (en)
Inventor
Donald D Grieg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Federal Telephone and Radio Corp
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Standard Telephone and Cables PLC
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Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US514998A priority Critical patent/US2418116A/en
Priority to GB19192/44A priority patent/GB600252A/en
Priority to FR935522D priority patent/FR935522A/fr
Application granted granted Critical
Publication of US2418116A publication Critical patent/US2418116A/en
Priority to FR55322D priority patent/FR55322E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0617—Systems characterised by the synchronising information used the synchronising signal being characterised by the frequency or phase
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B13/00—Generation of oscillations using deflection of electron beam in a cathode-ray tube
    • 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

Definitions

  • This invention relates to synchronizing syshalted.
  • the channels and receivers are so ar tems particularly adapted to synchronize multiranged that when the Progression i8 halted the f plex pulse system channels to assure proper channels are each properly aligned with their alignment thereof. associated receiver.
  • Multiplex communication systems have been The synchronizing system is adapted to line up proposed in which each channel comprises a train any multiplex pulse system regardless of its'purof spaced impulses. The pulses of each channel pose. It is contemplated for use more particuare spaced apart a predetermined distance and larly.
  • the pulses of each train are interleaved in such in the pulses are modulated with different sigspaces so that a plurality of separate messages 10 nals. These signals may be applied as amplimay be carried simultaneously on a common tude modulation of the pulses. orSoIne form medium.
  • the Areceivers are of time modulation such as cadence frequency adapted to select a single channel, and some modulation, 0r time displacement modulation. or means must be provided to assure a proper alignas pulse width modulation as desired. When ment of each channel with its associated receiver.
  • cade-noe frequency modulation of pulses is ein' This may be done by a visual or aural monitorployed the synchronizing signal must, of course, ing circuit. Such monitoring, however, requires be chosen outside of the frequency band of the that an operator manipulate some control to Signals transmitted over the other channels or effect the alignment.
  • l p at least the frequency of the synchronizing signal It is an object' of my invention .to provide a ⁇ 20 must be excluded from the intelligence Signals synchronizing system and method for a multiplex transmitted over the channels.
  • FIG. 1 is a schematic block circuit diagraml of rality of pulse channels in response to the modua .multiplex transmission System ⁇ in accordance lation of the received pulses. with my invention;
  • I pro- 5'0 Fig 2 iS a Circuit diagram of a time ⁇ displacevide, at the transmitting terminal of a multiplex ment modulator which may be used in the circuit pulse ⁇ communication system, a synchronizing of Flgl; 1 l source' which is used to modulate the pulses of Fig. 3 is a circuit diagram of a Selector and one channel. At the receiving end is provided a channel detector which may be used in the circuit selecting oscillator circuit operating at a fre- 0f Fig- 1;
  • Each of the channel modulators Il the oscillator is brought into synchronism and to 2
  • This modulation may be amplitude modulation, or some form of time modulation such as cadence frequency modulation, time displacement modulation or width modulation of the pulses.
  • the pulsesfrom the respective channels are applied to line 28 in such order that the pulses of the separate channels are interleaved one with another.
  • 'lhese pulses are then transmitted to the remote end of line 28 where they are applied to channel detectors 88, 3
  • a channel selector wave generator 88 which is preferably a multivibrator producing square wave impulses at a cadence frequency slightly lower ⁇ than the cadence frequency of the pulses of a channel.
  • 'I'hese square wave pulses are applied to selector 34 and over delay circuits 38, 48 and 4
  • the channels will be progressively applied to different channel detectors. This progression will continue until such time as channel is applied to the corresponding detector 38 for channel I. At this time, in the' output of channel I, will be present the synchronizing voltage from source 22. 'I'his synchronizing voltage is picked oif in synchronizing wave filter 42 and applied to multivibrator 88 to synchronize its operation to the average pulse cadence frequency. As a consequence, Vthe incoming pulse channels will then b ⁇ e applied to the proper detector circuits without further .progression-and ⁇ all the channels will be properly aligned.
  • a wave -source 43 may be provided synchronized with the output of multivibrator 38 to produce a demodulating wave.
  • This demodulating wave may be applied to channel detectors 38 to 88, respectively, over separate phase shifters 44, 45, 48, and 41.
  • the detected outputs of the separate channels may then be applied over hybrid ⁇ coils 48, 49, 58 and 5
  • a illter 58 is provided in the output of channel I to prevent application ci' this synchronizing source tothe audio frequency line 52.
  • receiver circuits may be coupled to the hybrid coils I4, I5, I8 and
  • and 32 may be provided, if desired, in which case demodulating wave source 43 and phase eliminated. While only four channels have been illustrated for the purpose of simplifying the showing, itis clear that a much larger nu'mber of channels may be multiplexed in accordance with my system.
  • Fig. 2 is illustrated a channel modulator suitable for use in the system. as illustrated in Fig. 1.
  • the signal input may be applied over a line 88 and a filter 8
  • Mixer ⁇ 18 comprises two vacuum tubes 1
  • the control wave from a source such as 23 is applied over line 11 to coil 18 of the modulator.
  • I'his control wa've,modulated with the otherinput waves, is applied over separate transformer connections 8l, 8
  • These tubes, as shown, are similarly biased so that in the absence of modulating input the rect′′d wave will be uniform providing equally spaced peaks or cusps.
  • the modulating voltages serve to alter the effective bias of the rectiers between the limits shown at 88 and 81 and thus vary the positions of the peaks of wave 85 between limits on opposite sides of the unmodulated position, (e. g., as at curve 85) dependingupon the modulation.
  • selector 84 is shown to comprise a mixing tube
  • This tube preferably is of the double grid type in which the two grids are so arranged that the signals incoming on the separate grids tend to combine to increase the output of the tube circuit.
  • incoming over the line are applied to one of the grids and the selector waves
  • 88 is biased beyond cutoif so that. Ain the absence of both signals being present at the same time, no output is obtained from the tube.
  • 88 serve to Partly remove the bias so that the tube is .lust below cut-olf.
  • are applied while pulses
  • this tube serves 'as a clipper at the same time as it serves as a 'mixer and output pulses
  • 85 is coupled across the input
  • 06 is applied simultaneously with the pulse train
  • 06 is a harmonic of the control wave frequency, preferably, an even harmonic thereof.
  • tube then will be produced the combined wave form
  • 04 will be raised to different levels above the clipping voltage of tube
  • the output of tube H0 will be present a plurality of pulses having an envelope frequency corresponding to the modulations of pulses i 0
  • This output signal is then applied over a low-pass lter H which serves to remove the pulse cadence frequency, to line
  • This same type of detector arrangement may be provided for each of the channels shown in Fig. 1. The control wave for the detector is shifted in phase properly to align it with the pulses of each of the selected channels.
  • Fig. 4 is illustrated a modied form of receiver circuit eliminating the necessity of a separate control wave source, as is used in connection with the circuit of Fig. 3.
  • the selected pulses from channel selector 34 are applied to the detector tube
  • a detecting wave is generated directly in circuit
  • This receiver circuit is of the type fdescribed more fully in my copending application Serial No; 459,959, filed September 28, 1942.
  • 20 may be applied over low-pass filter to filter 56 and to line
  • Curve' A of this gure illustrates the pulse responding channels to 4, inclusive.
  • curve B is shown the combination of pulses from the multivibrator selector arrangement and the incoming channel pulses.
  • the channels first arrive at the receiving end in such position that channel 3 is initially selected.
  • the cadencel frequency of the square wave pulses for multivibrator 38 issomewhat lower than the cadence frequencyof the channel pulses, the selection progressesffrom channel 3 to channel 4 and from channel 4 to channel l.
  • the synchronizing wave is able to e'ect control of the multivibrator circuit 38 and pull it into ⁇ step so that channel [continues to be selected at fthis point.
  • the other selector Waves, because of the delay circuits are also then properly timed to select a single channel and apply it to the respective channel indicators.
  • the .cadence lfrequency is shown to progress by half of the pulse interval of the combined pulse trains, it should upon reaching' channell, sufdc'ient number ofV pulses will be detected during the period of transversal of the selector pulse toconvey the synchronizing frequency to the multivibrator. It should further be understood that While the progression is relatively slow, the cadence frequencies for each channel are above normal audio frequencies, for example, in the range of 12 kilocycles or the like. Accordingly several hundred pulses may be selected from each channel without consuming an appreciable amount of time in bringing the circuit into proper synchronism.
  • selector system While in the principal example given the selector system is shown used to align a plurality of multiplex channels it is clear that the principles of my invention may be applied for the purpose of causing selective operation of any one receiver to pick out a, desired channel.
  • individual selector wave generators may be used with each receiver circuit as shown in connection with channel one.
  • Individual selector wave generators, with synchronizing wave lters may be provided to pull the selectors into step with a channel to which the particular synchronizing frequency has been applied.
  • any channel may be selected by simply modulating it with the proper synchronizing wave.
  • This principle may also be used for selectively dropping or intercepting at an intermediate point in the line any desired channel or channels.
  • munication means for timing said separateetrains of pulses in a given .timef displacement so that the pulses of successive trains are interleaved with respect to one another, ⁇ fand means for ini# parting-tothe pulses ofonefof said" channels a modulation of a predetermined frequency; and a second terminal including individual receiver means for said trains of pulses, separate selector means each for selecting a single channel for application to corresponding receiver means, a selector wave generator operating at a cadence lower than said given average cadence to supply a selector wave to each selectormeans, whereby it will serve to select progressively different channels for respective ones of said receiver means, lter means coupled to the output of the receiver means for said vone channel for selecting said modulation of said predetermined frequency, and means for applying said selected modulations to said selector wave generator to synchronize its operation with said given average cadence, whereby said channels will be continuously applied to their corresponding receiver means.
  • a multiplex system further comprising means for signal modulating the pulses in each of said trains, means for translating the signal output from each of Said receiver means, and means in the output of said one receiver between said translating means and said filter means for eliminating said selected modulations from said translator device.
  • a multiplex sy'stem according to claim 2 further comprising a plurality of sources of signals, a plurality of pulse generators, means for coupling said sources to said pulse generators to signal modulate said pulses, filter means in said coupling means to block signal frequencies of said predetermined frequency present at said signaflsources from signal modulatingsaid pulses.
  • said selector wave generator kserving to produce substantially rectangular pulses having a width less than said given average spacing to supply a selector Wave to each selector,l filter means coupled to the output of the selector for said one channel for selecting said modulation of said predetermined frequency, and means for applying said selected modulation to said selector wave generator to synchronize its operation with said given average cadence, whereby said channels will be continuously applied ⁇ to their corresponding selectors.
  • a multiplex system further comprising means jfor signal modulating the pulses in each of said trains, means at said second terminal for detecting signal output from each of said selectors, and further filter means in the output of the detecting means for said one channel for removing,A the modulation corresponding in frequency to said predetermined frequency from said detected signal output prior to application to further translator means.
  • a multiplex system further comprising a plurality of sources of signals, a plurality of pulse generators corresponding in number-to said plurality of trains, means for coupling said sources to said pulse generators to signal modulate said pulses, and filter means in said coupling means to block from said signals, frequencies of said predetermined frequency before modulation.
  • a multiplex system further comprising a, plurality of sources of signals, a.v plurality of pulse generators correspondchannels represented by separate trains of pulses of a given average cadence frequency, interleaved in time with respect to one another are transmitted to a receiver circuit in which the separate channels are selected and segregated and applied to separate receivers, the method of selecting said channels for proper aligned reception, which comprises modulating one of said channels with a synchronizing signal, selecting said channels in rotation with a selecting period longer than the period of said cadence frequency, whereby progressively different channels will be selected, detecting said selected channels, ltering out said synchronized signal at one of said receivers, and controlling said selecting period in response to' said filtered synchronizing signal to make it correspond to said average cadence frequency, whereby upon selection of said one channel at said one receiver, said progressive selection of channels is halted.
  • a multiplex system comprising a first terminal, means for transmitting a plurality of trains of pulses of a given average cadence each train representing a channel of communication,
  • a. plurality of separate channels represented by separate trains of pulses of a, given average cadence frequency, interleaved in time with respect to one another are transmitted to a receiver circuit in which the separate channels are selected and segregated and applied to separate receivers
  • the method of selecting one of said channels for reception at a given receiving station which comprises modulating one of said channels with a synchronizing signal, selecting said channels at said receiving station in rotation with a selecting period longer than said cadence frequency, whereby progressively different channels will be selected, detecting said selected channels, lteringcut said 'synchronizedsignal at said receiver station, and controlling said selecting period inresponseto said ltered synchronizing signal to make it correspond to said average cadence frequency, whereby upon selection of said one channel at said receiver station, said progressive selecsequence, the different trains representingdifferent channels, means to eiect intelligence moduasians Ylation oi' the pulses oi respective channels, means to modulate the
  • testing means appertains for removing energy corresponding to that of said distinct signal from such channels, thereby rendering said one channel distinctive for use as a synchronizing channel.
  • means for selecting the trains of pulses in succession including a device responsive to the energy of the distinctive signal, means to detect the signals of eachl train of pulses as they are selected, and means under control of said responsive device acting in the presence of energy of the distinctive signal in the detected signals to discontinue the succession of the selecting operation of said selecting means,
  • a receiver system for reception of the signal intelligence modulation of a given train of pulses interleaved in time spaced relation with other trains of pulses, said given train being modulated with a synchronizing signal distinct from said signal intelligence modulation; means for selecting the trains of pulses in succession including filter means, means to detect the signals of each train of pulsesas they are selected, said filter means passing only the energy of said synchronizing signal, means to apply said synchronizing signal energy to said selecting means to discontinue the succession of the selecting operation thereof, and a second lter means to pass the signal intelligence of said given channel and to block said synchronizing signal energy.
  • Inacommuni ltion system means for producing a plurality o Vtrains of pulses interleaved w together in a given sequence, the dilferenttrains representing diierent channels, separate.
  • kthe different trains representing diierent channels separate means for modulating .a characteristic of the. pulses of each of at least certain of said channels according to signalintelligence for such channel, means to modulate thepulses of one of said channels witha signal frequency outside the frequency band of the intelligence signals of the other channels, thereby rendering said one channel distinctive for use as a synchronizing channel, a receiving-terminal, means to transmit the interleaved trains of'pulses to said receiving terminal, said terminal having a plurality of receiving channels Vcorresponding to at least certain of said trains of pulses, means ⁇ for selecting the trains of pulses in rotation, means to detect the signals of each train of pulses as they are selected, lter means associated with'A one' of said receiver channels for passing only the energy of said synchronizing channel, means to apply said synchronizing energy to said selectoperation thereof, and means controlled by said selecting means for rendering each receiving channel receptive to pulses of said trains in accordance with the interleaved timing of saidcertain trains of pulses.
  • a normally blocked selector circuit means for producing deblocking pulses at a cadence lower than said average cadence, to deblock said selector circuit whereby said selector circuit is caused to scan in time, means to demodulate the signals of the pulses selected by said selector circuit, and means responsive to the presence of energy of said synchronizingsignals in the demodulated signals to cause, said deblocking pulse producing means to produce the deblocking pulses at said average cadence.
  • the method comprising selecting increments of received energy at a lower cadence than said average cadence to scan in time until said increments coincide substantially with the pulses y :mutuo not.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Near-Field Transmission Systems (AREA)
US514998A 1943-12-20 1943-12-20 Multiplex synchronizing system Expired - Lifetime US2418116A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US514998A US2418116A (en) 1943-12-20 1943-12-20 Multiplex synchronizing system
GB19192/44A GB600252A (en) 1943-12-20 1944-10-06 Synchronising arrangements for multiplex electric pulse communication systems
FR935522D FR935522A (fr) 1943-12-20 1946-10-31 Perfectionnements aux systèmes de synchronisation multiples
FR55322D FR55322E (fr) 1943-12-20 1947-04-04 Perfectionnements aux systèmes de synchronisation multiples

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FR (2) FR935522A (fr)
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Cited By (52)

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US2457986A (en) * 1945-12-11 1949-01-04 Bell Telephone Labor Inc Synchronization of time division multiplex communication system
US2471138A (en) * 1946-08-16 1949-05-24 Gen Electric Radio communication system
US2485343A (en) * 1946-04-20 1949-10-18 Magnetic Analysis Corp Multiple indicating system
US2485611A (en) * 1944-04-07 1949-10-25 Standard Telephones Cables Ltd Broadcasting system
US2490801A (en) * 1946-03-02 1949-12-13 Fed Telecomm Lab Inc Electrical pulse time modulation circuit
US2511146A (en) * 1945-03-13 1950-06-13 Du Mont Allen B Lab Inc Television receiver synchronizing
US2513308A (en) * 1945-09-01 1950-07-04 Standard Telephones Cables Ltd Electrical time modulated pulse communication system
US2513291A (en) * 1943-10-19 1950-07-04 Standard Telephones Cables Ltd Multiplex pulse time demodulator
US2516885A (en) * 1944-04-17 1950-08-01 Standard Telephones Cables Ltd Relay system
US2517365A (en) * 1946-04-10 1950-08-01 Patelhold Patentverwertung Multiplex communication system with channels of different band widths
US2520132A (en) * 1945-11-14 1950-08-29 Standard Telephones Cables Ltd Electronic line finder system
US2520170A (en) * 1945-11-14 1950-08-29 Standard Telephones Cables Ltd Pulse responsive circuit
US2527638A (en) * 1947-09-26 1950-10-31 Bell Telephone Labor Inc Pulse skip synchronization of pulse transmission systems
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2535104A (en) * 1944-12-26 1950-12-26 Int Standard Electric Corp Selective signaling equipment only operative by two-voice frequencies
US2537056A (en) * 1946-11-13 1951-01-09 Conrad H Hoeppner Pulse multiplex system
US2541076A (en) * 1944-08-07 1951-02-13 Standard Telephones Cables Ltd Multichannel pulse communicating system
US2546974A (en) * 1941-12-16 1951-04-03 Int Standard Electric Corp Pulse multiplex signaling system
US2565102A (en) * 1941-03-15 1951-08-21 Products & Licensing Corp System for connecting a single channel with a plurality of channels in periodical succession
US2570207A (en) * 1945-01-03 1951-10-09 Int Standard Electric Corp Synchronizing arrangement for multiplex electrical pulse communication systems
US2570249A (en) * 1947-03-29 1951-10-09 Sperry Corp Combining and separating circuits
US2589285A (en) * 1946-09-11 1952-03-18 Fed Telecomm Lab Inc Communication system
US2597038A (en) * 1947-11-19 1952-05-20 Int Standard Electric Corp Two-way electric pulse communication system
US2610295A (en) * 1947-10-30 1952-09-09 Bell Telephone Labor Inc Pulse code modulation communication system
US2613276A (en) * 1949-01-07 1952-10-07 John H Homrighous Multiplex time division radiophone system
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US2627553A (en) * 1946-11-21 1953-02-03 Gen Electric Multichannel signaling system
US2631194A (en) * 1947-07-22 1953-03-10 Int Standard Electric Corp Telecommunication system
US2643333A (en) * 1945-11-29 1953-06-23 Us Navy Data transmission system
US2649505A (en) * 1946-10-04 1953-08-18 Int Standard Electric Corp Pulse time position switching system
US2649540A (en) * 1946-07-08 1953-08-18 John H Homrighous Multiplex radiophone communication system
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US2672517A (en) * 1951-04-17 1954-03-16 Western Union Telegraph Co Pulse modulation phasing
US2680152A (en) * 1949-01-14 1954-06-01 Philco Corp Pulse communication system
US2680151A (en) * 1949-01-14 1954-06-01 Philco Corp Multichannel communication system
US2683768A (en) * 1950-02-01 1954-07-13 Rca Corp Multiplexing system synchronization
US2685047A (en) * 1950-02-25 1954-07-27 Rca Corp Color television electron beam deflection control system
US2719189A (en) * 1951-05-01 1955-09-27 Bell Telephone Labor Inc Prevention of interpulse interference in pulse multiplex transmission
US2720557A (en) * 1948-12-24 1955-10-11 Bell Telephone Labor Inc Time division pulse code modulation system employing continuous coding tube
US2723310A (en) * 1947-11-10 1955-11-08 Int Standard Electric Corp Time multiplex system
US2724017A (en) * 1947-01-29 1955-11-15 Vernon L Heeren Pulse multiplex communication systems
US2736772A (en) * 1947-01-29 1956-02-28 Burnight Thomas Robert Pulse multiplex communication system
US2740893A (en) * 1947-12-31 1956-04-03 Bendix Aviat Corp Chain oscillator in a multiplex system
US2750566A (en) * 1948-06-04 1956-06-12 Raytheon Mfg Co Telemetering transmission system
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US2967910A (en) * 1955-05-25 1961-01-10 Rca Corp Pulse transmitter
US3005051A (en) * 1956-01-24 1961-10-17 Ericsson Telefon Ab L M Noise elimination in multiplex transmission systems working according to the time division principle
US3440657A (en) * 1965-08-05 1969-04-22 Gen Motors Corp Multichannel multiplex communication system using pulse width modulation and an audio sync on one pulse

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US2105016A (en) * 1936-01-02 1938-01-11 Associated Electric Lab Inc Telephone transmission system
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GB555993A (en) * 1942-03-12 1943-09-15 Standard Telephones Cables Ltd Improvements in radio communication systems

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616977A (en) * 1952-11-04 Sheetsxsheet i
US2565102A (en) * 1941-03-15 1951-08-21 Products & Licensing Corp System for connecting a single channel with a plurality of channels in periodical succession
US2546974A (en) * 1941-12-16 1951-04-03 Int Standard Electric Corp Pulse multiplex signaling system
US2513291A (en) * 1943-10-19 1950-07-04 Standard Telephones Cables Ltd Multiplex pulse time demodulator
US2485611A (en) * 1944-04-07 1949-10-25 Standard Telephones Cables Ltd Broadcasting system
US2516885A (en) * 1944-04-17 1950-08-01 Standard Telephones Cables Ltd Relay system
US2541076A (en) * 1944-08-07 1951-02-13 Standard Telephones Cables Ltd Multichannel pulse communicating system
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2535104A (en) * 1944-12-26 1950-12-26 Int Standard Electric Corp Selective signaling equipment only operative by two-voice frequencies
US2570207A (en) * 1945-01-03 1951-10-09 Int Standard Electric Corp Synchronizing arrangement for multiplex electrical pulse communication systems
US2511146A (en) * 1945-03-13 1950-06-13 Du Mont Allen B Lab Inc Television receiver synchronizing
US2451044A (en) * 1945-07-09 1948-10-12 Bell Telephone Labor Inc Communication system employing pulse code modulation
US2513308A (en) * 1945-09-01 1950-07-04 Standard Telephones Cables Ltd Electrical time modulated pulse communication system
US2520132A (en) * 1945-11-14 1950-08-29 Standard Telephones Cables Ltd Electronic line finder system
US2520170A (en) * 1945-11-14 1950-08-29 Standard Telephones Cables Ltd Pulse responsive circuit
US2643333A (en) * 1945-11-29 1953-06-23 Us Navy Data transmission system
US2457986A (en) * 1945-12-11 1949-01-04 Bell Telephone Labor Inc Synchronization of time division multiplex communication system
US2490801A (en) * 1946-03-02 1949-12-13 Fed Telecomm Lab Inc Electrical pulse time modulation circuit
US2517365A (en) * 1946-04-10 1950-08-01 Patelhold Patentverwertung Multiplex communication system with channels of different band widths
US2485343A (en) * 1946-04-20 1949-10-18 Magnetic Analysis Corp Multiple indicating system
US2649540A (en) * 1946-07-08 1953-08-18 John H Homrighous Multiplex radiophone communication system
US2471138A (en) * 1946-08-16 1949-05-24 Gen Electric Radio communication system
US2589285A (en) * 1946-09-11 1952-03-18 Fed Telecomm Lab Inc Communication system
US2649505A (en) * 1946-10-04 1953-08-18 Int Standard Electric Corp Pulse time position switching system
US2537056A (en) * 1946-11-13 1951-01-09 Conrad H Hoeppner Pulse multiplex system
US2627553A (en) * 1946-11-21 1953-02-03 Gen Electric Multichannel signaling system
US2724017A (en) * 1947-01-29 1955-11-15 Vernon L Heeren Pulse multiplex communication systems
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Also Published As

Publication number Publication date
FR935522A (fr) 1948-06-22
FR55322E (fr) 1952-01-02
GB600252A (en) 1948-04-05

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