US1824635A - Synchronization in television and facsimile transmission system - Google Patents
Synchronization in television and facsimile transmission system Download PDFInfo
- 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
- Authority
- 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
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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.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Facsimiles In General (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
Sept. 22, 1931. A. c. STOCKER 1,824,635
SYNCHRQNIZATION IN TELEVISION AND FACSIMILE'TRANSMISSION SYSTEM Filed Oct. 21, 1930 Fig. I
Dela l lpparafus Transmission 1 4 synchronizing T rans/miffer fi yfifem I I flpplir'afus /L J@J Invntor": Arthur' C. Stocker;
m ma/afa His Attorney.
cable to such systems where rence of such transient phenomena is less Patented Sept. 22, 1931 UNITED STATES PATENT OFFICE ARTHUR C. STOCKER, OI! AUDUBON, NEW JERSEY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK SYNCHRONIZATION IN TELEVISION .AND FACSIM'ILE TRANSMISSION SYSTEM Application filed October 21, 1980. Serial No. 490,237.
My invention relates to television and facsimile transmission systems and particularly to the synchronization of the transmitting and receiving apparatus of such systems. In
| the past, synchronization commonly has 10 and using it to control the speed of the receiver. Since the instantaneous value of that voltage determined the instantaneous position of the scanning apparatus of the receiver, an transient phenomena such as is static, switc ing surges, etc. may'cause the receiver to swing or hunt and may even cause it to fall out of step.
It is the object of my invention to provide an improved method and apparatus appliy the occurliable to produce an objectionable effect on the receiver. In carrying out my inventio 1 in accordance with the form thereof which I have chosen to illustrate, I employ as before a synchronizing signal comprisin regularly recurring impulses which is pro need at the transmitter and transmitted to the receiver.
3 At the receiver I divide the signal into two parts. One part I delay one or more whole number of cycles according to convenience and then combine the two parts to make up the complete signal according to which the synchronization is efi'ected. Thus, with a sinusoidal or other perfectly recurrent signal voltage transmitted, the voltage delivered to the synchronizer would remain apo parently unchanged. -Any transient phe-' nomena picked up in the transmission, be-' ing of a non-recurrent character, would be delivered to the synchronizer as two such phenomena, each of half value, and separated by a time equal to the time lag of the delaying apparatus. Synchronization is thus made steadier and less liable to failure due to the occurrence of transients. The possibility of two similar transients occurring at a time interval equal to the time lag of the delay apparatus is so remote that such an occurrence may be neglected.
My invention will be better understood from the following description taken in connection with the accompanying drawings, and its scope will'be pointed out in the appended claims.
Referring to the drawings, Fig. 1 is a block diagram of a system involving my invention and Fig. 2 is a detail thereof.
In 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. By means of the si nal divider 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. In 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.
While I have chosen to illustrate and describe my invention in its simplest form, namely, that in which the signal is divided into two parts one of which is delayed, it is not limited to such form inasmuch as the signal may, if desired, be divided into a greater number of parts of which a plurality of parts are caused to be delayed each a difi'erent number of whole number of c cles. Moreover if desired both or all of t e parts may be delayed different whole numbers of cycles.
Various modifications may therefore be made without departure from the spirit and scope of my invention which modifications I aim to cover by the appended claims.
What I claim as new and desire to secure by Letters Patent of the United States,
1. In a television or facsimile transmission system employing a synchronizing signal comprising regularly recurring impulses, 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.
2. In a television or facsimile transmission system employing a synchronizing signal comprising regularly recurring impulses,
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.
4, In 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. In a television or facsimile transmission system employing 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.
In witness whereof, I have hereunto set my hand this 16th day of October, 1930. I ARTHUR C. STOCKER.
parts a whole number of impulse cycles and means for recombining said parts to form acomplete synchronizi ng signal.
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 (en) | 1930-10-21 | 1931-10-16 | Improvements made to image transmission methods and apparatus, and in particular to their synchronization |
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 (en) |
FR (1) | FR730551A (en) |
GB (1) | GB375658A (en) |
Cited By (3)
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)
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 (en) * | 1955-05-02 |
-
1930
- 1930-10-21 US US490237A patent/US1824635A/en not_active Expired - Lifetime
-
1931
- 1931-10-16 FR FR730551D patent/FR730551A/en not_active Expired
- 1931-10-20 GB GB29142/31A patent/GB375658A/en not_active Expired
Cited By (3)
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 (en) | 1932-08-18 |
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