GB1518681A - Method and apparatus for synchronizing facsimile transceivers - Google Patents
Method and apparatus for synchronizing facsimile transceiversInfo
- Publication number
- GB1518681A GB1518681A GB2361975A GB2361975A GB1518681A GB 1518681 A GB1518681 A GB 1518681A GB 2361975 A GB2361975 A GB 2361975A GB 2361975 A GB2361975 A GB 2361975A GB 1518681 A GB1518681 A GB 1518681A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sync
- frequency
- altering
- drum
- receiver
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/36—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for synchronising or phasing transmitter and receiver
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Transmission Control (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
1518681 Synchronizing facsimile transceivers EXXON RESEARCH & ENG CO 30 May 1975 [30 July 1974] 23619/75 Heading H2L [Also in Division H4] Synchronization between facsimile transceivers is established and maintained by generating local sync. pulses 44 in the receiver at a substantially different frequency to that of sync. pulses received, comparing 46, 48 the phase difference therebetween and altering the local sync. frequency at a fast rate until partial pulse coincidence occurs then altering that frequency at a slower rate until substantial pulse coincidence occurs. At the transmitter an original is mounted on a drum 12T, Fig. 1, driven at a constant rate by a synchronous motor 10T. If the receiver coincidence detectors 46 and 48 control the gating of a variable counter 62 which receives a constant clock from oscillator 58 to provide a plurality of discreet local sync. frequencies, which control the drive rate of drum 12R on which the record medium is mounted. The logic circuits of the various units are described with reference to Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49311974A | 1974-07-30 | 1974-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1518681A true GB1518681A (en) | 1978-07-19 |
Family
ID=23958980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2361975A Expired GB1518681A (en) | 1974-07-30 | 1975-05-30 | Method and apparatus for synchronizing facsimile transceivers |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5137514A (en) |
| CA (1) | CA1031453A (en) |
| DE (1) | DE2534027A1 (en) |
| FR (1) | FR2281020A1 (en) |
| GB (1) | GB1518681A (en) |
| IT (1) | IT1038762B (en) |
| NL (1) | NL7508119A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0031487A1 (en) * | 1979-12-26 | 1981-07-08 | International Business Machines Corporation | Facsimile apparatus and method for restarting a facsimile machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4081842A (en) * | 1976-06-14 | 1978-03-28 | Eocom Corporation | Facsimile system |
-
1975
- 1975-05-28 CA CA227,990A patent/CA1031453A/en not_active Expired
- 1975-05-30 GB GB2361975A patent/GB1518681A/en not_active Expired
- 1975-06-06 IT IT2410975A patent/IT1038762B/en active
- 1975-07-08 NL NL7508119A patent/NL7508119A/en not_active Application Discontinuation
- 1975-07-28 FR FR7523522A patent/FR2281020A1/en active Granted
- 1975-07-30 DE DE19752534027 patent/DE2534027A1/en not_active Withdrawn
- 1975-07-30 JP JP50092163A patent/JPS5137514A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0031487A1 (en) * | 1979-12-26 | 1981-07-08 | International Business Machines Corporation | Facsimile apparatus and method for restarting a facsimile machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5137514A (en) | 1976-03-29 |
| FR2281020A1 (en) | 1976-02-27 |
| IT1038762B (en) | 1979-11-30 |
| CA1031453A (en) | 1978-05-16 |
| NL7508119A (en) | 1976-02-03 |
| FR2281020B1 (en) | 1980-12-05 |
| DE2534027A1 (en) | 1976-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |