US1824635A - Synchronization in television and facsimile transmission system - Google Patents

Synchronization in television and facsimile transmission system Download PDF

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Publication number
US1824635A
US1824635A US490237A US49023730A US1824635A US 1824635 A US1824635 A US 1824635A US 490237 A US490237 A US 490237A US 49023730 A US49023730 A US 49023730A US 1824635 A US1824635 A US 1824635A
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US
United States
Prior art keywords
signal
synchronization
parts
television
transmission 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
US490237A
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English (en)
Inventor
Arthur C Stocker
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US490237A priority Critical patent/US1824635A/en
Application granted granted Critical
Publication of US1824635A publication Critical patent/US1824635A/en
Priority to FR730551D priority patent/FR730551A/fr
Priority to GB29142/31A priority patent/GB375658A/en
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
    • H04J3/10—Arrangements for reducing cross-talk between channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually

Definitions

  • My invention relates to television and facsimile transmission systems and particularly to the synchronization of the transmitting and receiving apparatus of such systems.
  • Fig. 1 is a block diagram of a system involving my invention and Fig. 2 is a detail thereof.
  • Fig. 1 I have represented 'at 1 the transmitter of the system; 2 represents the transmission system which may be radio, wire line or any other transmitting means; 3 represents the signal divider forming a part of the receiver.
  • the receiver signal is divided in the present case'into two parts, one of these parts is subjected to the effect of the delay apparatus 4 which, as has already been pointed out, causes a delay in the signal of one or more whole number of cycles.
  • the two parts of the divided signal thereafter are united by the signal uniter 5 and the complete signal is then employed in the synchronizing apparatus 6 to control the speed of the receiver.
  • the time delay apparatus 4 may comprise any well known form of apparatus suitable for this purpose.
  • Fig, 2 I have illustrated one form of apparatus that may be employed. In accordance with this figure,
  • the signal divider comprises the transformer shown a well known form of attenuatorwhich is represented ascomprising the series non-inductive resistances 17 and the parallel resistance 18. It will be understood 100 that the purpose of the attenuator just described is only to effect the same attenua- .two parts, delaying one tion in both parts of the signal.
  • the method of reducing the effect of transient phenomena on the synchronization which comprises dividing the synchronizing signal at the receivin station into a plurality of parts, producing a phase dislacement of one ofsaid parts a whole numr of cycles and recombining the parts to' make up a complete signal by which the synchronization is effected.
  • the synchronization which comprises dividmg the signal at the receiving station into art a whole number of cycles, and recom ining the parts to make up the complete signal by which the synchronization is effected.
  • a television or facsimile transmission system employing a synchronizing signal comprising regularly recurring impulses, means at the receiving station of said system for dividing the synchronizing signal into a plurality of parts, means producing a phase displacement of one of said 5.
  • a synchronizin signal comprising an alternating vo tage
  • means at the receivin station of said system providing a divi ed path for the synfor producing an attenuation substantially equal to that in the one branch, and means for uniting the signals of said branches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Facsimiles In General (AREA)
US490237A 1930-10-21 1930-10-21 Synchronization in television and facsimile transmission system Expired - Lifetime US1824635A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US490237A US1824635A (en) 1930-10-21 1930-10-21 Synchronization in television and facsimile transmission system
FR730551D FR730551A (fr) 1930-10-21 1931-10-16 Perfectionnements apportés aux procédés et appareils de transmission des images, et en particulier à leur synchronisation
GB29142/31A GB375658A (en) 1930-10-21 1931-10-20 Improvements in and relating to systems of television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US490237A US1824635A (en) 1930-10-21 1930-10-21 Synchronization in television and facsimile transmission system

Publications (1)

Publication Number Publication Date
US1824635A true US1824635A (en) 1931-09-22

Family

ID=23947198

Family Applications (1)

Application Number Title Priority Date Filing Date
US490237A Expired - Lifetime US1824635A (en) 1930-10-21 1930-10-21 Synchronization in television and facsimile transmission system

Country Status (3)

Country Link
US (1) US1824635A (fr)
FR (1) FR730551A (fr)
GB (1) GB375658A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485556A (en) * 1941-12-02 1949-10-25 Int Standard Electric Corp Facsimile communication system
US2962549A (en) * 1955-03-30 1960-11-29 Alden Products Co Method and apparatus for generating facsimile signals
US3535451A (en) * 1967-12-21 1970-10-20 Webb James E Means for generating a sync signal in an fm communication system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491728A (en) * 1937-03-10 1938-09-08 Eric Lawrence Casling White Improvements in or relating to circuit arrangements for separating electric signal pulses
NL94264C (fr) * 1955-05-02

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485556A (en) * 1941-12-02 1949-10-25 Int Standard Electric Corp Facsimile communication system
US2962549A (en) * 1955-03-30 1960-11-29 Alden Products Co Method and apparatus for generating facsimile signals
US3535451A (en) * 1967-12-21 1970-10-20 Webb James E Means for generating a sync signal in an fm communication system

Also Published As

Publication number Publication date
GB375658A (en) 1932-06-30
FR730551A (fr) 1932-08-18

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