GB1155623A – Error Reduction Coding for Digital Facsimile
– Google Patents
GB1155623A – Error Reduction Coding for Digital Facsimile
– Google Patents
Error Reduction Coding for Digital Facsimile
Info
Publication number
GB1155623A
GB1155623A
GB36096/66A
GB3609666A
GB1155623A
GB 1155623 A
GB1155623 A
GB 1155623A
GB 36096/66 A
GB36096/66 A
GB 36096/66A
GB 3609666 A
GB3609666 A
GB 3609666A
GB 1155623 A
GB1155623 A
GB 1155623A
Authority
GB
United Kingdom
Prior art keywords
signals
signal
facsimile
output
transmitted
Prior art date
1965-08-30
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
Application number
GB36096/66A
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.)
Xerox Corp
Original Assignee
Xerox Corp
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.)
1965-08-30
Filing date
1966-08-12
Publication date
1969-06-18
1966-08-12
Application filed by Xerox Corp
filed
Critical
Xerox Corp
1969-06-18
Publication of GB1155623A
publication
Critical
patent/GB1155623A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
H04N1/32614—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper related to a single-mode communication, e.g. at the transmitter or at the receiver
Abstract
1,155,623. Facsimile transmission; digital transmission systems. XEROX CORP. 12 Aug., 1966 [30 Aug., 1965], No. 36096/66. Headings H4F and H4P. In a facsimile system comprising a transmitter for transmitting a bi-level video electric signal train wherein a first level is indicative of information to be transmitted and wherein a second level is indicative of absence of information and a receiver responsive to received video signals for reproducing the information, the streaking effect of errors due to noise or extraneous signals in the transmission path is reduced to one bit errors in the printed document at the receiver by creating a number of error-correcting transitions during otherwise transitionless transmission times in the transmitted facsimile signals by logically mixing or combining the bi-level video pulse train and a basic timing or clock pulse train at the facsimile transmitter. In the transmitter the video signal output of a light responsive detector which scans the document to be transmitted is passed via a clocked squaring amplifier to one input of an AND gate, its other input being connected to the output of a time base generator generating the clock pulse train. The output of the AND gate is passed to a flip-flop circuit and the transmitted signal corresponds to the bi-level pulse train from the amplifier with the background of informationless signals chopped or divided at the clock rate, i.e. the transmitted signal is coded. In the receiver the signal is decoded by means of two logical gates fed with the output of a time base base generator, synchronized with the time base generator in the transmitter, and the received signals which have been shaped, differentiated, delayed and rectified, and the outputs of the gates are fed to a flip-flop circuit. The output of the flip-flop circuit, i.e. the decoded signal, is fed to a marking means which scans a recording drum and the decoded signal is such that any error signals picked up during the transmission of the facsimile information signals appear in the decoded waveform as single bit errors. The Specification states that this reduction in the error duration time to a single bit eliminates the streaking which would occur since an error signal normally generates a succession of errors continuing until the occurrence of the next noise or legitimate information bit in which the transition is opposite to the noise effect.
GB36096/66A
1965-08-30
1966-08-12
Error Reduction Coding for Digital Facsimile
Expired
GB1155623A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US48348765A
1965-08-30
1965-08-30
Publications (1)
Publication Number
Publication Date
GB1155623A
true
GB1155623A
(en)
1969-06-18
Family
ID=23920243
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB36096/66A
Expired
GB1155623A
(en)
1965-08-30
1966-08-12
Error Reduction Coding for Digital Facsimile
Country Status (4)
Country
Link
US
(1)
US3484547A
(en)
GB
(1)
GB1155623A
(en)
NL
(1)
NL6611230A
(en)
SE
(1)
SE345567B
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3611149A
(en)
*
1969-06-06
1971-10-05
Bottelle Dev Corp The
Iterated switched mode receiver
JPS557988B2
(en)
*
1973-10-01
1980-02-29
US5172247A
(en)
*
1990-10-24
1992-12-15
Eastman Kodak Company
High speed digital error diffusion process for continuous tone image-to-binary image conversion
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3244808A
(en)
*
1962-01-12
1966-04-05
Massachusetts Inst Technology
Pulse code modulation with few amplitude steps
US3179889A
(en)
*
1962-10-02
1965-04-20
Bell Telephone Labor Inc
Timing of pulse transmission systems by interspersed opposite-polarity pulses
US3337864A
(en)
*
1963-08-01
1967-08-22
Automatic Elect Lab
Duobinary conversion, reconversion and error detection
1965
1965-08-30
US
US483487A
patent/US3484547A/en
not_active
Expired – Lifetime
1966
1966-07-20
SE
SE9929/66A
patent/SE345567B/xx
unknown
1966-08-10
NL
NL6611230A
patent/NL6611230A/xx
unknown
1966-08-12
GB
GB36096/66A
patent/GB1155623A/en
not_active
Expired
Also Published As
Publication number
Publication date
SE345567B
(en)
1972-05-29
NL6611230A
(en)
1967-03-01
US3484547A
(en)
1969-12-16
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None