US2438903A - Pulse communication system employing pulse frequency reduction for signaling - Google Patents

Pulse communication system employing pulse frequency reduction for signaling Download PDF

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Publication number
US2438903A
US2438903A US505778A US50577843A US2438903A US 2438903 A US2438903 A US 2438903A US 505778 A US505778 A US 505778A US 50577843 A US50577843 A US 50577843A US 2438903 A US2438903 A US 2438903A
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US
United States
Prior art keywords
frequency
impulses
signaling
pulse
communication system
Prior art date
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
US505778A
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English (en)
Inventor
Edmond M Deloraine
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
Original Assignee
Standard Telephone and Cables PLC
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 BE481274D priority Critical patent/BE481274A/xx
Priority to BE473141D priority patent/BE473141A/xx
Priority to US504881A priority patent/US2438902A/en
Priority to US505778A priority patent/US2438903A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB22121/44A priority patent/GB583629A/en
Priority to GB3162/45A priority patent/GB600261A/en
Priority to CH276277D priority patent/CH276277A/fr
Priority to FR946811D priority patent/FR946811A/fr
Priority to FR57499D priority patent/FR57499E/fr
Priority to CH262447D priority patent/CH262447A/de
Application granted granted Critical
Publication of US2438903A publication Critical patent/US2438903A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/28—Electric signal transmission systems in which transmission is by pulses using pulse code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/12—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Definitions

  • This invention relates to signaling systems and more particularly Vto signaling systems adapted for use in regular intelligence communication systems.
  • Fig. 1 is a block circuit diagram of a system embodying our invention.
  • Fig. 2 is a setof curves used in explaining the operation ofthe system of Fig. 1.
  • a multiplex impulse communication system comprising a source of synchronizing Waves supplying Vcontrol Waves to impulse modulator and through phase Shifters I4 and I5 toother impulse modulators I2 and I3. It ⁇ should beunderstood that while only three channels are'shown in the present system, other modulators may he provided to furnish as many -channels as the line can properly carry. 'The ⁇ outputs from impulse modulators
  • impulses areapplied ⁇ to a synchronizing control oscillator or other means of any suitable type 20 and to ⁇ channel selectors 2
  • 'synchronizing control output 2 is applied to channel selector 2
  • are applied over line 26 and condenser 21 to the voice or other frequency reproducing demodulating apparatus 3
  • the output from each ⁇ channel selector 22 and 23 is applied over lines 26A, 26B and condensers 21A,
  • the impulses I, 2 and 3 are modulated, preferably in time position, in accordance with the sound signals to be transmitted.
  • the sound signals derived from the impulses are applied at the output of demodulators 3
  • Vpulse amplitude modulation may be used instead of time modulation, if desired, in which case the Vdemodulators will serve to reproduce the sound frequency envelope directly.
  • the separate channels are used for separate communications.
  • a frequency divider is provided 4to reduce the number of ⁇ impulses in that; channel to a ringing or signaling frequency.
  • This frequency divider comprises a square Wave generator VIta', and a mixer and clipper Ib to provide a Wave of the form such as 30 shown in curve b which is added to the impulse train serving to elevate every fourth impulse from the output koin-icdulator I These elevated impulses are then clipped at the level indicated by clipping line 3
  • the factor of frequency division is shown only by Way of illustration. Normally, the number of impulses applied to the line would be in the order of twelve thousand per second. It would usually be preferable then to reduc-e the frequency to some value depending on the ringing connection used. Where the output of the demodulator is ⁇ used to supply theringing energy a value such as or 300 pulses or cycles per second would he used, so that the frequency division normally would be much greater than-that shown in itssimpllied form for purposes of illustration.
  • channel selector 2I will provide this low signaling frequency as indicated by the impulses above the clipping level 33a of curve c.
  • Condenser 21 preferably is selected so that it does not pass this low frequency and all the low frequency is therefore shunted over low pass-filter 28 to signaling buzzer 29.
  • the signaling unit may be connected directly across. line 2li..f
  • a transmission system comprising a source of impulses for producing impulses having a normal spacing providing a cadence frequency for saidimpulses higher than the frequency of in- 28, buzzer 29 may readily be made of such frequency characteristics 'that it will respond to these low frequency-signals but will serve as a choke to the normal higher frequencies.
  • a second means of utilizing the signalling characteristics of the device is to allow-the audio output of demodulator .3l rather than the direct pulses to energize relay 29. Under this condition an audio tone corresponding to the divided pulse frequency will be obtained at the output of the demodulator and Vwhich is of suiiiciently low frequency to be passed by filter 28 and excite the buzzer 29. For this type of operation, connection is made to the buzzer 29, from the output side of demodulator 3 I.
  • frequency dividers IBA and IEB connectable into the line by means of switches-IIA, IIB, respectively.
  • the signaling frequencies produced by frequency dividers IBA and ISB are selected in demodulators 22 and 23, respectively, and applied to the respective outputs at 28A, 29A andr28B, 29B t-o signal these other selected stations.
  • a single frequency divider may be used for all channels in place of the individual dividers by providing the proper switching arrangement.
  • any desired form of frequency divider may be used in place of the type diagrammatically illustrated.
  • other forms of signaling equipment than the simple buzzers may be provided. if desired, at the receiving end.
  • a system of signaling comprising means for effectively selecting certain discrete impulses of said .train at regularly recurring intervals, whereby telligence normally transmitted thereby, a transmission "medium for said impulses, receiver means for receiving said'impulses after transmis- -sion over said medium, a frequency divider for reducing said cadence frequency to alower signal frequency cadence,A means for selectively inserting said frequency divider between said impulse source and said medium, and means in the .output of said receiver means responsive to said signal cadence frequency impulses to produce a signal indication at said receiver.l 1 Y Y 3.
  • a signaling arrangement comprising a selector for selecting discrete impulses of said train at regularly recurring intervals whereby there is provided at the output of said selector a train of impulses recurring at a cadence equal to the periodV of a lower frequency, means for selectively coupling said transmitter either directly to said transmission medium or through said selector to said medium, and signal means at said receiver responsive to said impulses of said lower frequency coupled to said receiver for producing said signals.
  • a transmission system comprising a source of impulses for producing impulses having ancrmal spacing providing a cadence frequency for said impulses higher than the frequency of Vintelligence normally transmitted thereby, a transmission line for said impulses, receiver means for receiving said impulses after transmission over ⁇ said line, a frequency divider for reducing said cadence frequency to a lower signal frequency cadence, means for selectively inserting said frequency divider into said line, and means in the output oi said receiver means responsive to said signal cadence frequency impulses to produce a signal indication at said receiver.
  • a system for selectively signaling from any one of said transmitters to the corresponding receiver comprising a frequency divider means for each said transmitter to provide for reduction of said 5 cadence frequency to a signal frequency, means for selectively connecting each frequency divider in the output of its corresponding transmitter, and signal responsive means tuned to respond to said signal frequency, coupled to the output 5 .transmission line at each receiver.
  • a multi-channel communication system further comprising a synchronizing wave source at the transmitter terminal and a, second synchronizing source at the receiver 10 terminal for normally synchronizing the operation of said transmitters and said receivers, and means coupling said synchronizing source at said transmitter terminal in phase controlled relation to said frequency dividers to synchronize 15 REFERENCES CITED

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Alarm Systems (AREA)
US505778A 1943-10-04 1943-10-11 Pulse communication system employing pulse frequency reduction for signaling Expired - Lifetime US2438903A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BE481274D BE481274A (de) 1943-10-11
BE473141D BE473141A (de) 1943-10-11
US504881A US2438902A (en) 1943-10-04 1943-10-04 Pulse multiplex system employing fixed pulse-time displacement for signaling
US505778A US2438903A (en) 1943-10-11 1943-10-11 Pulse communication system employing pulse frequency reduction for signaling
GB22121/44A GB583629A (en) 1943-10-11 1944-11-09 Improvements in or relating to signalling arrangements for electric pulse communication systems
GB3162/45A GB600261A (en) 1943-10-11 1945-02-07 Electric pulse communication and signalling system
CH276277D CH276277A (fr) 1943-10-11 1947-03-31 Installation de communication par impulsions.
FR946811D FR946811A (fr) 1943-10-11 1947-05-14 Systèmes de signalisation et de communication
FR57499D FR57499E (fr) 1943-10-11 1947-08-05 Systèmes de signalisation et de communication
CH262447D CH262447A (de) 1943-10-11 1947-09-18 Verfahren und Vorrichtung zur Tonfrequenzsignalisierung in einem die Nachrichten durch Impulsmodulation übertragenden Kanal.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US505778A US2438903A (en) 1943-10-11 1943-10-11 Pulse communication system employing pulse frequency reduction for signaling

Publications (1)

Publication Number Publication Date
US2438903A true US2438903A (en) 1948-04-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US505778A Expired - Lifetime US2438903A (en) 1943-10-04 1943-10-11 Pulse communication system employing pulse frequency reduction for signaling

Country Status (5)

Country Link
US (1) US2438903A (de)
BE (2) BE481274A (de)
CH (2) CH276277A (de)
FR (2) FR946811A (de)
GB (2) GB583629A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2534842A (en) * 1947-10-10 1950-12-19 Panoramic Radio Corp Dual synchrometric system
US2534844A (en) * 1947-11-26 1950-12-19 Panoramic Radio Corp Gated triple synchrometric system
US2590746A (en) * 1948-09-10 1952-03-25 Lee E Adler Control system for carrier telecommunication circuits
US2657269A (en) * 1947-01-02 1953-10-27 Int Standard Electric Corp Electric pulse modulation system of communication
US2773937A (en) * 1949-12-24 1956-12-11 Gen Dynamics Corp Electronic signaling and switching system
DE957241C (de) * 1951-04-17 1957-01-31 Cie Ind Des Telephones Sa Anordnung zur Signalgabe bei Impulsuebertragungssystemen
US2945094A (en) * 1954-09-07 1960-07-12 Itt Pulse signalling system
US2962553A (en) * 1954-11-23 1960-11-29 Donald E Campbell Coding and decoding system
US3083267A (en) * 1960-10-20 1963-03-26 Bell Telephone Labor Inc Pcm telephone signaling
US3146314A (en) * 1961-09-25 1964-08-25 Gen Dynamics Corp Means for generating warbling tone ringing signals in a time division multiplex communication system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE404982B (sv) * 1977-12-22 1978-11-06 Ericsson Telefon Ab L M Sett och anordning for att i en telefonianleggning overfora digital information

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484405A (en) * 1920-01-12 1924-02-19 Western Electric Co Signaling system
US1532336A (en) * 1920-12-18 1925-04-07 Rca Corp Wireless-telegraph calling device
GB418525A (en) * 1933-05-20 1934-10-26 Newsome Henry Clough Improvements in calling devices in connection with wireless signalling or carrier frequency line signalling systems
US2048081A (en) * 1933-04-29 1936-07-21 Alger S Riggs Communication system
US2172354A (en) * 1935-11-14 1939-09-12 Emi Ltd Multiplex signaling system
US2204375A (en) * 1937-03-17 1940-06-11 Morrison Montford Electronic distributor system
US2213941A (en) * 1938-07-26 1940-09-03 Bell Telephone Labor Inc Multiplex signaling by phase discrimination
US2263369A (en) * 1939-02-03 1941-11-18 Hartford Nat Bank & Trust Co Multiplex telephony system
US2326584A (en) * 1939-02-20 1943-08-10 Hartford Nat Bank & Trust Co Multiplex telephony system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484405A (en) * 1920-01-12 1924-02-19 Western Electric Co Signaling system
US1532336A (en) * 1920-12-18 1925-04-07 Rca Corp Wireless-telegraph calling device
US2048081A (en) * 1933-04-29 1936-07-21 Alger S Riggs Communication system
GB418525A (en) * 1933-05-20 1934-10-26 Newsome Henry Clough Improvements in calling devices in connection with wireless signalling or carrier frequency line signalling systems
US2172354A (en) * 1935-11-14 1939-09-12 Emi Ltd Multiplex signaling system
US2204375A (en) * 1937-03-17 1940-06-11 Morrison Montford Electronic distributor system
US2213941A (en) * 1938-07-26 1940-09-03 Bell Telephone Labor Inc Multiplex signaling by phase discrimination
US2263369A (en) * 1939-02-03 1941-11-18 Hartford Nat Bank & Trust Co Multiplex telephony system
US2326584A (en) * 1939-02-20 1943-08-10 Hartford Nat Bank & Trust Co Multiplex telephony system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2657269A (en) * 1947-01-02 1953-10-27 Int Standard Electric Corp Electric pulse modulation system of communication
US2534842A (en) * 1947-10-10 1950-12-19 Panoramic Radio Corp Dual synchrometric system
US2534844A (en) * 1947-11-26 1950-12-19 Panoramic Radio Corp Gated triple synchrometric system
US2590746A (en) * 1948-09-10 1952-03-25 Lee E Adler Control system for carrier telecommunication circuits
US2773937A (en) * 1949-12-24 1956-12-11 Gen Dynamics Corp Electronic signaling and switching system
DE957241C (de) * 1951-04-17 1957-01-31 Cie Ind Des Telephones Sa Anordnung zur Signalgabe bei Impulsuebertragungssystemen
US2945094A (en) * 1954-09-07 1960-07-12 Itt Pulse signalling system
US2962553A (en) * 1954-11-23 1960-11-29 Donald E Campbell Coding and decoding system
US3083267A (en) * 1960-10-20 1963-03-26 Bell Telephone Labor Inc Pcm telephone signaling
US3146314A (en) * 1961-09-25 1964-08-25 Gen Dynamics Corp Means for generating warbling tone ringing signals in a time division multiplex communication system

Also Published As

Publication number Publication date
FR57499E (fr) 1953-01-28
BE481274A (de)
GB600261A (en) 1948-04-05
FR946811A (fr) 1949-06-15
CH262447A (de) 1949-06-30
GB583629A (en) 1946-12-23
BE473141A (de)
CH276277A (fr) 1951-06-30

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