GB1090112A - Improvements in or relating to pulse transmission systems - Google Patents
Improvements in or relating to pulse transmission systemsInfo
- Publication number
- GB1090112A GB1090112A GB982563A GB982563A GB1090112A GB 1090112 A GB1090112 A GB 1090112A GB 982563 A GB982563 A GB 982563A GB 982563 A GB982563 A GB 982563A GB 1090112 A GB1090112 A GB 1090112A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spaces
- marks
- group
- store
- digit
- 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
- H04L25/4906—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 binary codes
-
- 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
- H04L25/4906—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 binary codes
- H04L25/4915—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 binary codes using pattern inversion or substitution
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
1,090,112. Data transmission systems. H.M. POSTMASTER GENERAL. June 12, 1964 [March 12, 1963], No. 9825/63. Heading H4P. A transmitter, Fig. 1, comprises a store 1 for holding successive groups of signals, a disparity circuit indicating whether marks or spaces predominate, a trigger set by this indication, an inverter 11 to invert the polarity of each digit of selected groups, a counter 8 serving as a second disparity indicator indicating whether in the total transmission marks or spaces predominate, and a unit 7 comparing the outputs of the two indicators, which controls the inverter to reduce the disparity values and inserts a digit indicating that a group has been inverted according to the results of the comparison. The purpose of balancing the marks and spaces is to avoid D.C. bias building up in the line. Marks may be represented by positive voltage and spaces by an equal negative voltage. The eight-bit group in store 1 applies signals to adding resistors 3 so that the voltage at point 4 indicates the disparity between marks and spaces. If marks predominante trigger 6A is set to one state and if spaces, to the other. Meanwhile the previous group which has been transferred to store 12 is being read out via inverter 11 which is enabled or not according to the condition of trigger 10. Integrator 8 is a counter which counts forward for a mark and backward for a space so that it contains a measure of the accumulated disparity. If both indicators 2 and 8 indicate a predominance of the same digit the unit 7 gives an output to set trigger 10 and enable inverter 11. The group is then transferred by gates to store 12 and a " 1 " digit entered in the ninth stage indicates at the receiver if the group has been inverted. The nine read-out pulses for store 12 occupy the same period as eight digits of the input signal. This first digit is used at the receiver to cause the group of digits to be re-inverted so that it may be stored in its original condition.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB982563A GB1090112A (en) | 1963-03-12 | 1963-03-12 | Improvements in or relating to pulse transmission systems |
| US434293A US3405235A (en) | 1963-03-12 | 1965-02-23 | Systems for transmitting code pulses having low cumulative displarity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB982563A GB1090112A (en) | 1963-03-12 | 1963-03-12 | Improvements in or relating to pulse transmission systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1090112A true GB1090112A (en) | 1967-11-08 |
Family
ID=9879507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB982563A Expired GB1090112A (en) | 1963-03-12 | 1963-03-12 | Improvements in or relating to pulse transmission systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1090112A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2334188A (en) * | 1998-02-05 | 1999-08-11 | Motorola Gmbh | Direct current (dc) balancing in an ac coupled system |
| WO2005032086A1 (en) * | 2003-09-30 | 2005-04-07 | Infineon Technologies Ag | Data transmission system with reduced power consumption, method and transmission circuit |
-
1963
- 1963-03-12 GB GB982563A patent/GB1090112A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2334188A (en) * | 1998-02-05 | 1999-08-11 | Motorola Gmbh | Direct current (dc) balancing in an ac coupled system |
| WO2005032086A1 (en) * | 2003-09-30 | 2005-04-07 | Infineon Technologies Ag | Data transmission system with reduced power consumption, method and transmission circuit |
| US7321628B2 (en) | 2003-09-30 | 2008-01-22 | Infineon Technologies Ag | Data transmission system with reduced power consumption |
| DE112004003149B4 (en) * | 2003-09-30 | 2014-11-06 | Qimonda Ag | Data transmission system with reduced power consumption, method and transmission circuit |
| DE112004001830B4 (en) * | 2003-09-30 | 2015-02-26 | Qimonda Ag | Data transmission system with reduced power consumption, method and transmission circuit |
| DE112004003153B4 (en) * | 2003-09-30 | 2016-01-07 | Samsung Electronics Co., Ltd. | Data transmission system with reduced power consumption, method and transmission circuit |
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