GB1466281A - Facsimile transmission - Google Patents
Facsimile transmissionInfo
- Publication number
- GB1466281A GB1466281A GB2528374A GB2528374A GB1466281A GB 1466281 A GB1466281 A GB 1466281A GB 2528374 A GB2528374 A GB 2528374A GB 2528374 A GB2528374 A GB 2528374A GB 1466281 A GB1466281 A GB 1466281A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- register
- eol
- read
- word
- 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
- H04N1/41—Bandwidth or redundancy reduction
- H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
- H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
- H04N1/419—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information in which encoding of the length of a succession of picture-elements of the same value along a scanning line is the only encoding step
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Transmission Control (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
1466281 Data transmission; facsimile systems HASLER AG 6 June 1974 [8 June 1973] 25283/74 Headings H4P and H4F In a facsimile system, particularly incorporating redundancy reducing coding, each picture line received is tested for errors, which if found, is scrapped and the previous line already reproduced is duplicated on the next line position. A code word EOL is transmitted after the end of each line and on receipt of each EOL word, a test is made to ascertain whether the sum of picture points since the previous EOL word, derived from a decoder, corresponds to the known number of points per line. A beginning of line word BOL is also transmitted, any gaps in the line being filled with blanks. At the transmitter, a reader 1 controlled by 3 emits binary signals to shift register 2. At each line end, control 5 causes a BOL signal to be emitted from read only memory 7 and routed through OR 19 and modulator 8 to line followed by content of register 2 through coder 20. This includes a counter 10 which, between each change of brightness value, counts digits which count is dumped into register 12 for transmission, then proceeds to count the alternative value. Control 5 also detects when register 2 is empty, i.e. an end of line condition, hence EOL is emitted from memory 18 and next line is recorded in register 2. At the receiver after demodulation at 32 a circuit 57 synchronizes a clock with incoming signals which are clocked into register 34 having a decoder 35 which recognizes BOL (EOL) signals and provides an output on line 36 (37) which sets (resets) flip-flop 38. Via read only memory 39 a succession of code words in a section of register 34 is passed to counter 40 which are clocked to zero, when the counter stops and resets but pulses are continually read into register 45 and counter 47, which records actual number of points received per line plus the number of bits = EOL. A signal on line 49 via gates 50 tests whether EOL is in decoder 35 and if so a signal is given on line 51 to write control 53 causing emptying of register 45 to writing device 54 and subsequent advancement of one line space. Meanwhile register 46 is being filled through switch 56 reversed. Control 57 determines whether a code word signifies 0 or 1. If not so, a signal on line 52 prevents switch 56 being reversed, the register storing the previous line being read out again to the writing device and the subsequent line received from the transmitter is over-read into the register with the faulty line bits.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH842373A CH558994A (en) | 1973-06-08 | 1973-06-08 | IMAGE TRANSFER PROCEDURE. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1466281A true GB1466281A (en) | 1977-03-02 |
Family
ID=4340107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2528374A Expired GB1466281A (en) | 1973-06-08 | 1974-06-06 | Facsimile transmission |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5033716A (en) |
CH (1) | CH558994A (en) |
DE (1) | DE2347835B2 (en) |
FR (1) | FR2232891B1 (en) |
GB (1) | GB1466281A (en) |
IT (1) | IT1014303B (en) |
NL (1) | NL7407286A (en) |
SE (1) | SE389436B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208195B (en) * | 1987-06-12 | 1991-11-20 | Murata Machinery Ltd | Facsimile communication systems |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1109461B (en) * | 1976-08-10 | 1985-12-16 | Philips Nv | METHOD AND COMPLEX FOR CORRECTION OF ERRORS IN FACSIMILE TRANSMISSIONS |
NL7608862A (en) * | 1976-08-10 | 1978-02-14 | Philips Nv | SCHEME FOR TRANSMISSION OF CODED MESSAGES WITH A REDUCED TRANSMISSION TIME. |
JPS5330215A (en) * | 1976-09-01 | 1978-03-22 | Hitachi Ltd | Coding transmission system for picture signal |
DE2711377C2 (en) * | 1977-03-16 | 1984-08-30 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Method and arrangement for facsimile image transmission |
DE2927710A1 (en) * | 1979-07-09 | 1981-01-29 | Philips Nv | METHOD AND ARRANGEMENT FOR ERROR CORRECTION IN FACSIMILE TRANSMISSION |
DE3311911A1 (en) * | 1983-03-31 | 1984-10-04 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND CIRCUIT ARRANGEMENT FOR IMAGE ERROR CORRECTION |
JPS60194870A (en) * | 1984-03-16 | 1985-10-03 | Fujitsu Ltd | Facsimile receiver |
DE4021061C2 (en) * | 1990-07-04 | 1998-11-05 | Holzer Walter Prof Dr H C Ing | Method for coding facsimile fax copies |
-
1973
- 1973-06-08 CH CH842373A patent/CH558994A/en not_active IP Right Cessation
- 1973-09-22 DE DE2347835A patent/DE2347835B2/en not_active Ceased
-
1974
- 1974-05-30 NL NL7407286A patent/NL7407286A/xx not_active Application Discontinuation
- 1974-06-06 GB GB2528374A patent/GB1466281A/en not_active Expired
- 1974-06-06 SE SE7407443-6A patent/SE389436B/en unknown
- 1974-06-07 IT IT68814/74A patent/IT1014303B/en active
- 1974-06-07 JP JP49064147A patent/JPS5033716A/ja active Pending
- 1974-06-07 FR FR7419835A patent/FR2232891B1/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208195B (en) * | 1987-06-12 | 1991-11-20 | Murata Machinery Ltd | Facsimile communication systems |
Also Published As
Publication number | Publication date |
---|---|
CH558994A (en) | 1975-02-14 |
FR2232891B1 (en) | 1979-03-16 |
FR2232891A1 (en) | 1975-01-03 |
DE2347835A1 (en) | 1974-12-19 |
SE7407443L (en) | 1974-12-09 |
NL7407286A (en) | 1974-12-10 |
DE2347835B2 (en) | 1979-11-15 |
SE389436B (en) | 1976-11-01 |
JPS5033716A (en) | 1975-04-01 |
IT1014303B (en) | 1977-04-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |