GB1357837A - Coding device for binary transmission - Google Patents
Coding device for binary transmissionInfo
- Publication number
- GB1357837A GB1357837A GB4734272A GB4734272A GB1357837A GB 1357837 A GB1357837 A GB 1357837A GB 4734272 A GB4734272 A GB 4734272A GB 4734272 A GB4734272 A GB 4734272A GB 1357837 A GB1357837 A GB 1357837A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- transmission
- gates
- oct
- binary
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
-
- 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
- H04N1/4135—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information in which a baseband signal showing more than two values or a continuously varying baseband signal is transmitted or recorded
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Dc Digital Transmission (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
1357837 Data transmission; coding COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 13 Oct 1972 [13 Oct 1971] 47342/72 Heading H4P The circuit of Fig. 4, converts a binary signal A (waveforms, Fig. 5, not shown) to a five-level signal Y whose levels are alternately 0, 1, 0, 1, &c. This enables a lower bandwidth channel to be used for the same binary bit rate. In Fig. 5, the two parallel channels, which are identical except for an inverter 11, include divide-by-two circuits 12, 13, 17, 18, and AND gates 14, 15 and 19, 20 responsive to complementary outputs of dividers 13, 18. Inverters 16, 21 and the gates 14, 19 feed an adding circuit 22. The output amplifier 23 may in addition (Fig. 8, not shown) have e.m.f. sources 29, 30 gated at 31, 32 to its input by monostables 27, 28 controlled by threshold circuits 25, 26, in order to boost the peak levels of the signal Y (Figs. 9, 10, not shown) prior to transmission, and thereby reduce signal degradation during transmission. A demodulator (Fig. 6, not shown) reproduces the binary signals by two successive full-wave rectification steps, and uses transformers and diodes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7136797A FR2161744B1 (en) | 1971-10-13 | 1971-10-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1357837A true GB1357837A (en) | 1974-06-26 |
Family
ID=9084310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4734272A Expired GB1357837A (en) | 1971-10-13 | 1972-10-13 | Coding device for binary transmission |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE789644A (en) |
CA (1) | CA971666A (en) |
DE (1) | DE2249819C2 (en) |
FR (1) | FR2161744B1 (en) |
GB (1) | GB1357837A (en) |
IT (1) | IT975237B (en) |
LU (1) | LU66254A1 (en) |
NL (1) | NL156288B (en) |
SE (1) | SE387498B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2250898A (en) * | 1990-12-12 | 1992-06-17 | Stc Plc | Line coding scheme. |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3337863A (en) * | 1964-01-17 | 1967-08-22 | Automatic Elect Lab | Polybinary techniques |
US3459892A (en) * | 1965-09-14 | 1969-08-05 | Bendix Corp | Digital data transmission system wherein a binary level is represented by a change in the amplitude of the transmitted signal |
GB1250492A (en) * | 1967-07-27 | 1971-10-20 |
-
0
- BE BE789644D patent/BE789644A/en not_active IP Right Cessation
-
1971
- 1971-10-13 FR FR7136797A patent/FR2161744B1/fr not_active Expired
-
1972
- 1972-10-09 LU LU66254D patent/LU66254A1/xx unknown
- 1972-10-09 NL NL7213636A patent/NL156288B/en not_active IP Right Cessation
- 1972-10-10 SE SE1305272A patent/SE387498B/en unknown
- 1972-10-11 DE DE19722249819 patent/DE2249819C2/en not_active Expired
- 1972-10-12 CA CA154,147A patent/CA971666A/en not_active Expired
- 1972-10-12 IT IT7021272A patent/IT975237B/en active
- 1972-10-13 GB GB4734272A patent/GB1357837A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2250898A (en) * | 1990-12-12 | 1992-06-17 | Stc Plc | Line coding scheme. |
Also Published As
Publication number | Publication date |
---|---|
FR2161744A1 (en) | 1973-07-13 |
CA971666A (en) | 1975-07-22 |
BE789644A (en) | 1973-04-04 |
NL7213636A (en) | 1973-04-17 |
IT975237B (en) | 1974-07-20 |
SE387498B (en) | 1976-09-06 |
NL156288B (en) | 1978-03-15 |
FR2161744B1 (en) | 1977-08-05 |
DE2249819A1 (en) | 1973-04-19 |
DE2249819C2 (en) | 1982-09-16 |
LU66254A1 (en) | 1973-04-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |