GB596051A - Improvements in or relating to electrical pulse communication systems - Google Patents

Improvements in or relating to electrical pulse communication systems

Info

Publication number
GB596051A
GB596051A GB1820445A GB1820445A GB596051A GB 596051 A GB596051 A GB 596051A GB 1820445 A GB1820445 A GB 1820445A GB 1820445 A GB1820445 A GB 1820445A GB 596051 A GB596051 A GB 596051A
Authority
GB
United Kingdom
Prior art keywords
pulses
modulated
time
channel
amplitude
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
Application number
GB1820445A
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
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 US536301A priority Critical patent/US2474244A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB596051A publication Critical patent/GB596051A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/08Intermediate station arrangements, e.g. for branching, for tapping-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/155Ground-based stations
    • H04B7/17Ground-based stations employing pulse modulation, e.g. pulse code modulation

Abstract

596,051. Multiplex pulse signalling. STANDARD TELEPHONES & CABLES, Ltd. July 16, 1945, No. 18204. Convention date, May 19, 1944. [Class 40 (v)] A communication system including a plurality of stations uses time-modulated pulses between two of the stations, which pass through a third station, and amplitude modulation of the timemodulated pulses is used for communication between the third station and one of the other two. The system may be further multiplexed by the intercalation of several time-modulated channel trains of pulses. In one embodiment, for a single time-modulated channel, a relay and " in and out" branching unit is designed to receive pulses 17, Fig. 2, having both time and amplitude modulation. A decoupling amplifier 18 and low-pass filter 19 yield the wave 21 with which pulses 17 are amplitude modulated. A clipper-amplifier 22 inverts and removes the amplitude modulation from pulses 17 to yield time-modulated pulses 24. If switches 25, 29 are open and switch 35 closed, the pulses 24 are passed to valve 36 where they are further amplitude modulated with a signal 37 from source 38 and pass out of the station as pulses 39. Alternatively, with switch 35 open, and switches 25, 29 closed, the pulses 24 are demodulated at 26 and,fed through low-pass filter 27 to a reproducing device 28. Further time-modulated pulses 30 are produced in modulator 31 fed from a signal source 32 and a wave generator 34 synchronized by pulses 24. The new pulses 30 are fed over switch 29 to valve 36 for amplitude modulation as before. A multi-channel unit is also described, wherein intercalated time and amplitude-modulated pulse trains are received from a radio receiver 53, Fig. 3, or line 51, the pulses of one channel train being of greater duration than those of the others to serve as synchronizing pulses. Gating pulses for the three channels shown are derived from clipper 57, synchronizing channel pulse duration discriminator 58, gating pulse shaper 59 and individual phase-shifters 60, 61, 62 adjusted to pass the gating pulses to channel separators 63, 64, 65, respectively, with the correct phase. Relay units 71, 72, 73, respectively, of the type shown in Fig. 2 are connected to the outputs of units 63, 64, 65 and their outputs are fed to a mixer 74 feeding the outgoing line 75 or radio transmitter 76.
GB1820445A 1944-05-19 1945-07-16 Improvements in or relating to electrical pulse communication systems Expired GB596051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US536301A US2474244A (en) 1944-05-19 1944-05-19 Amplitude modulated time modulated pulse system

Publications (1)

Publication Number Publication Date
GB596051A true GB596051A (en) 1947-12-24

Family

ID=33030142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1820445A Expired GB596051A (en) 1944-05-19 1945-07-16 Improvements in or relating to electrical pulse communication systems

Country Status (3)

Country Link
US (1) US2474244A (en)
BE (1) BE473447A (en)
GB (1) GB596051A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH249976A (en) * 1945-12-15 1947-07-31 Patelhold Patentverwertung Method and device for two-channel transmission.
US2611826A (en) * 1947-06-05 1952-09-23 Kalfaian Meguer Simultaneous amplitude modulation and phase modulation with economy in bandwidth
US2680153A (en) * 1949-01-14 1954-06-01 Philco Corp Multichannel communication system
US2662116A (en) * 1949-12-31 1953-12-08 Potier Gaston Xavier-Noel Double modulated pulse transmission
US2716217A (en) * 1950-07-29 1955-08-23 Raytheon Mfg Co Communication system
US2824908A (en) * 1952-08-07 1958-02-25 Du Mont Allen B Lab Inc Television system method and apparatus for multiplex signaling
US3020349A (en) * 1954-12-03 1962-02-06 Int Standard Electric Corp Electric pulse modulating and demodulating circuits
US2918665A (en) * 1955-04-08 1959-12-22 Gilfillan Bros Inc Modulation method and system
US2953644A (en) * 1956-10-04 1960-09-20 Bell Telephone Labor Inc Wave transmission system
DE1117643B (en) * 1958-08-06 1961-11-23 Siemens Ag Circuit arrangement for the multiplicative mixing of two electrical signals
US3078449A (en) * 1958-09-24 1963-02-19 Cons Electrodynamics Corp Commutating and modulating apparatus
DE1252283B (en) * 1959-03-16
US3286521A (en) * 1964-03-26 1966-11-22 Kennecott Copper Corp Wind direction and velocity recording system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103847A (en) * 1928-10-02 1937-12-28 Rca Corp Signaling
US2075071A (en) * 1932-07-23 1937-03-30 Rca Corp Modulation
US2045107A (en) * 1932-12-02 1936-06-23 Rca Corp Phase modulation
NL88393C (en) * 1937-06-18
NL60289C (en) * 1939-02-20
US2271721A (en) * 1939-05-03 1942-02-03 Rca Corp Method and means for transmitting a plurality of signals over the same channel
BE479581A (en) * 1942-07-03
BE474051A (en) * 1942-10-07
BE462299A (en) * 1943-10-19

Also Published As

Publication number Publication date
US2474244A (en) 1949-06-28
BE473447A (en) 1947-11-23

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