FR2379955A1 - VARIABLE SPEED FACSIMILE TRANSMITTER USING A PHOTO-DETECTION NETWORK IN MEMORY MODE - Google Patents
VARIABLE SPEED FACSIMILE TRANSMITTER USING A PHOTO-DETECTION NETWORK IN MEMORY MODEInfo
- Publication number
- FR2379955A1 FR2379955A1 FR7804052A FR7804052A FR2379955A1 FR 2379955 A1 FR2379955 A1 FR 2379955A1 FR 7804052 A FR7804052 A FR 7804052A FR 7804052 A FR7804052 A FR 7804052A FR 2379955 A1 FR2379955 A1 FR 2379955A1
- Authority
- FR
- France
- Prior art keywords
- photo
- variable speed
- clock pulse
- memory mode
- detection network
- 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.)
- Granted
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
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
-
- 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
- H04N1/40—Picture signal circuits
- H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Heads (AREA)
- Facsimile Transmission Control (AREA)
Abstract
Dans un émetteur de fac-similé à vitesse variable utilisant un réseau de photo-détection en mode mémoire comme explorateur de lignes, ce réseau est excité à un rythme d'horloge choisi parmi plusieurs rythmes sélectionnables de façon à engendrer un signal de lignes vidéo en réponse à chaque impulsion d'horloge. Le reseau de photo-détection est déchargé à un instant retardé, par rapport à l'arrivée d'une impulsion d'horloge, d'un intervalle déterminé par la différence entre le rythme d'horloge sélectionné et le rythme d'horloge le plus élevé pour écarter signal vidéo disponible à cet instant et ensuite, laisser se développer une charge pendant le reste de l'intervalle entre les impulsions d'horloge, où il résulte qu'un signal de ligne vidéo d'amplitude constante prend naissance à l'arrivée de chaque impulsion d'horloge quel que soit le rythme d'horloge sélectionné.In a variable speed facsimile transmitter using a memory mode photo-detection array as a line explorer, that array is excited at a clock rate selected from a number of selectable rates so as to generate a video line signal in. response to each clock pulse. The photo-detection network is discharged at a time delayed, with respect to the arrival of a clock pulse, by an interval determined by the difference between the selected clock rate and the fastest clock rate. high to remove the video signal available at that time and then allow a charge to develop for the remainder of the clock pulse interval, whereby a constant amplitude video line signal arises at the same time. arrival of each clock pulse regardless of the selected clock rate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52012729A JPS5855712B2 (en) | 1977-02-07 | 1977-02-07 | Facsimile scanning method |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2379955A1 true FR2379955A1 (en) | 1978-09-01 |
FR2379955B1 FR2379955B1 (en) | 1983-01-14 |
Family
ID=11813518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7804052A Granted FR2379955A1 (en) | 1977-02-07 | 1978-02-07 | VARIABLE SPEED FACSIMILE TRANSMITTER USING A PHOTO-DETECTION NETWORK IN MEMORY MODE |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5855712B2 (en) |
CA (1) | CA1130443A (en) |
DE (1) | DE2804979A1 (en) |
FR (1) | FR2379955A1 (en) |
GB (1) | GB1572539A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0011023A1 (en) * | 1978-11-03 | 1980-05-14 | Thomson-Csf | Scanning device with photosensors and facsimile apparatus comprising such a device |
EP0251817A2 (en) * | 1986-07-04 | 1988-01-07 | Canon Kabushiki Kaisha | Method of reading signal in charge-storage line sensor |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53141520A (en) * | 1977-05-16 | 1978-12-09 | Ricoh Co Ltd | Picture scanning read system of semiconductor photo detector |
US4223357A (en) * | 1978-10-23 | 1980-09-16 | Alden Research Foundation | Facsimile recorder with sweep rate detection |
JPS56158571A (en) * | 1980-05-12 | 1981-12-07 | Nec Corp | Facsimile dispatching broadcast communication system |
JPS5995769A (en) * | 1982-11-25 | 1984-06-01 | Hitachi Ltd | Ccd sensor driver |
FR2568077B1 (en) * | 1984-07-17 | 1994-08-12 | Canon Kk | IMAGE READING APPARATUS. |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2304448A1 (en) * | 1972-01-31 | 1973-08-09 | Hitachi Ltd | LIGHT SENSOR CONTROL DEVICE |
US3867569A (en) * | 1974-02-25 | 1975-02-18 | Bell Telephone Labor Inc | Compact flatbed page scanner |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49130118A (en) * | 1973-04-13 | 1974-12-13 | ||
JPS5423761B2 (en) * | 1975-03-13 | 1979-08-16 |
-
1977
- 1977-02-07 JP JP52012729A patent/JPS5855712B2/en not_active Expired
-
1978
- 1978-02-06 GB GB474778A patent/GB1572539A/en not_active Expired
- 1978-02-06 DE DE19782804979 patent/DE2804979A1/en active Granted
- 1978-02-07 FR FR7804052A patent/FR2379955A1/en active Granted
- 1978-02-07 CA CA296,601A patent/CA1130443A/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2304448A1 (en) * | 1972-01-31 | 1973-08-09 | Hitachi Ltd | LIGHT SENSOR CONTROL DEVICE |
US3867569A (en) * | 1974-02-25 | 1975-02-18 | Bell Telephone Labor Inc | Compact flatbed page scanner |
Non-Patent Citations (1)
Title |
---|
NV8056/75 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0011023A1 (en) * | 1978-11-03 | 1980-05-14 | Thomson-Csf | Scanning device with photosensors and facsimile apparatus comprising such a device |
FR2440668A1 (en) * | 1978-11-03 | 1980-05-30 | Thomson Csf | PHOTOSENSOR ANALYSIS DEVICE AND FACSIMILE APPARATUS COMPRISING SUCH A DEVICE |
EP0251817A2 (en) * | 1986-07-04 | 1988-01-07 | Canon Kabushiki Kaisha | Method of reading signal in charge-storage line sensor |
EP0251817A3 (en) * | 1986-07-04 | 1989-04-26 | Canon Kabushiki Kaisha | Method of reading signal in charge-storage line sensor |
Also Published As
Publication number | Publication date |
---|---|
CA1130443A (en) | 1982-08-24 |
JPS5397319A (en) | 1978-08-25 |
JPS5855712B2 (en) | 1983-12-10 |
DE2804979B2 (en) | 1981-07-18 |
GB1572539A (en) | 1980-07-30 |
FR2379955B1 (en) | 1983-01-14 |
DE2804979C3 (en) | 1982-05-13 |
DE2804979A1 (en) | 1978-08-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
D6 | Patent endorsed licences of rights | ||
ST | Notification of lapse |