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GB555619A - Improvements in electric signal transmission systems - Google Patents

Improvements in electric signal transmission systems

Info

Publication number
GB555619A
GB555619A GB2644/42A GB264442A GB555619A GB 555619 A GB555619 A GB 555619A GB 2644/42 A GB2644/42 A GB 2644/42A GB 264442 A GB264442 A GB 264442A GB 555619 A GB555619 A GB 555619A
Authority
GB
United Kingdom
Prior art keywords
pulses
frequency
wave
sine
key
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
GB2644/42A
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2644/42A priority Critical patent/GB555619A/en
Priority to US471396A priority patent/US2428010A/en
Publication of GB555619A publication Critical patent/GB555619A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/026—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse time characteristics modulation, e.g. width, position, interval

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Selective Calling Equipment (AREA)

Abstract

555,619. Simultaneous telephony and telegraphy. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and HOUGHTON, L. W. Feb. 27, 1942, No. 2644. [Class 40 (iv)] [Also in Group XL] A telegraph system employs short unidirectional pulses which are sent at one frequency for marks and at a different frequency for spaces, and a simultaneous communication (e.g. speech) is sent by time modulation of the pulses. A sine-wave generator 1 is connected to a pulse generator 2 so as to generate pulses at the crests of the sine-wave. A second pulse generator 3 generates pulses at the troughs of the wave. Thus when the key 13 is closed pulses of double the sine-wave frequency are present in the mixer 4, whilst when the key 13 is open the pulse frequency is the same as the sine-wave frequency. The pulses may be applied to a radio transmitter 11, 15. Reception is obtained by passing the pulses through a filter which transmits one frequency and attenuates the other. A simultaneous telephony or other channel is afforded by time-modulating at 14 the pulses generated at 2. In an alternative telegraph system, the key is arranged to change the frequency of the sine-wave generator which in this case is connected to a single pulsegenerator, Fig. 5 (not shown).
GB2644/42A 1942-02-27 1942-02-27 Improvements in electric signal transmission systems Expired GB555619A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2644/42A GB555619A (en) 1942-02-27 1942-02-27 Improvements in electric signal transmission systems
US471396A US2428010A (en) 1942-02-27 1943-01-06 Single carrier telephone and telegraph pulse multiplex system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2644/42A GB555619A (en) 1942-02-27 1942-02-27 Improvements in electric signal transmission systems

Publications (1)

Publication Number Publication Date
GB555619A true GB555619A (en) 1943-08-31

Family

ID=9743214

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2644/42A Expired GB555619A (en) 1942-02-27 1942-02-27 Improvements in electric signal transmission systems

Country Status (2)

Country Link
US (1) US2428010A (en)
GB (1) GB555619A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515452A (en) * 1947-05-06 1950-07-18 Maxime G Kaufman Pulse signaling system
US3814840A (en) * 1972-05-08 1974-06-04 Telecommunications Technology Igital switching technique for use on communications circuits

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309459A (en) * 1919-07-08 Wireless signaling system
US1702470A (en) * 1929-02-19 Assigitob to wbstihg
US913521A (en) * 1905-05-27 1909-02-23 Gen Electric Multiplex telephony.
US1734038A (en) * 1917-08-04 1929-11-05 American Telephone & Telegraph Electrical transmission of energy
US1530666A (en) * 1917-10-31 1925-03-24 Jr John Hays Hammond Multiplex system for the transmission of radiant energy
US1376051A (en) * 1919-04-10 1921-04-26 Taylor Albert Hoyt Simultaneous transmission or reception of speech and signals
US1732741A (en) * 1925-05-04 1929-10-22 Westinghouse Electric & Mfg Co Duplex radio transmission system
GB353906A (en) * 1930-04-29 1931-07-29 Marconi Wireless Telegraph Co Improvements in or relating to multi-channel or multiplex high frequency signalling systems
US2025190A (en) * 1933-03-21 1935-12-24 Rca Corp Multiplex signaling
US2070418A (en) * 1933-05-19 1937-02-09 Rca Corp Multiplex cable code telegraphy with diversity reception
US2033948A (en) * 1934-01-09 1936-03-17 Percival D Lowell Carrier wave printing telegraph system
US2061734A (en) * 1934-09-29 1936-11-24 Rca Corp Signaling system
US2195855A (en) * 1934-12-07 1940-04-02 Ibm Signaling system
US2086918A (en) * 1935-08-22 1937-07-13 Rca Corp Method of frequency or phase modulation
GB467095A (en) * 1935-12-06 1937-06-07 Cyril John Francis An improved system for the electrical transmission of wave signals such as speech or television
US2227108A (en) * 1936-02-20 1940-12-31 Telefunken Gmbh Signaling system
US2113214A (en) * 1936-10-29 1938-04-05 Rca Corp Method of frequency or phase modulation

Also Published As

Publication number Publication date
US2428010A (en) 1947-09-30

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