GB902206A - Improvements in or relating to communication systems - Google Patents
Improvements in or relating to communication systemsInfo
- Publication number
- GB902206A GB902206A GB3908660A GB3908660A GB902206A GB 902206 A GB902206 A GB 902206A GB 3908660 A GB3908660 A GB 3908660A GB 3908660 A GB3908660 A GB 3908660A GB 902206 A GB902206 A GB 902206A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- signal
- receiver
- transmitter
- iii
- 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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Communication Control (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
902,206. Telegraphy. SIEMENS & HALSKE A.G. Nov. 14, 1960 [Nov. 13, 1959], No. 39086/60. Class 40 (3). In a telegraph system in which the transmitted and received characters are arranged in groups, there is added to each group a control signal indicative of a characteristic of that group. At the receiver this control signal is compared with a second control signal derived by the receiver from the received character group. If the two signals are not similar, or do not bear a predetermined relation to each other, the receiver transmits a callback signal to the transmitter, which retransmits the incorrectly received group. Stores are provided at the receiver and transmitter for recording the character signals; preferably at least two groups are stored. It is arranged that interference which simulates the reception at the transmitter of a call-back signal, and therefore produces repetition of at least one group, does not cause the receiver printer to print the group characters twice. Faulty reception of a group, Fig. 1.-The transmitter station A transmits the characters a, b, c, &c., and after each seven characters transmits a control signal γ. If the derived, or second, control signal at the receiver B is not γ but, say, #, group II, the receiver transmitter sends a call-back signal # to the transmitter A. The group being transmitted upon reception of the signal #, group III, is terminated by a repetition characteristic #instead of the control signal γ, and the two groups, II and III, transmitted previously, are repeated. On reception of the signal # at B, the two groups II and III previously received and stored are not passed to the teleprinter. The retransmitted groups II and III, if now received correctly, as in Fig. 1, are passed via the store to the teleprinter. Reception of a spurious signal, Fig. 2.-As in Fig. 1, the letters of the alphabet are transmitted sequentially in groups. Group II is received correctly at B, but during transmission of group III the transmitter A receives an interference signal S which simulates a callback signal #. Group III is therefore terminated by a repetition characteristic e, and the groups II and III are retransmitted. At the receiver B the signal # is recognised, but since the previously received control signal and the derived signal agreed, γ group II, the stored signals now blocked to the teleprinter are group III and the retransmitted group II. The retransmitted group III is passed to the teleprinter. An embodiment of the invention is described with reference to Fig. 3 (not shown). With twowire transmission the repetition signal e is not necessary, the transmitter and receiver being connected serially.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES65819A DE1086737B (en) | 1959-11-13 | 1959-11-13 | Method for the secure transmission of binary-coded message characters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB902206A true GB902206A (en) | 1962-08-01 |
Family
ID=7498330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3908660A Expired GB902206A (en) | 1959-11-13 | 1960-11-14 | Improvements in or relating to communication systems |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE596916A (en) |
CH (1) | CH384625A (en) |
DE (1) | DE1086737B (en) |
GB (1) | GB902206A (en) |
NL (1) | NL257697A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL125227C (en) * | 1960-03-15 | 1969-01-15 | ||
DE1168472B (en) * | 1960-09-22 | 1964-04-23 | Siemens Ag | Method for the secure transmission of information continuously recorded on a high-speed tape storage device in a simple digital code |
NL264766A (en) * | 1961-05-15 | |||
NL122463C (en) * | 1961-11-03 | 1967-11-15 | ||
US3475723A (en) * | 1965-05-07 | 1969-10-28 | Bell Telephone Labor Inc | Error control system |
-
1959
- 1959-11-13 DE DES65819A patent/DE1086737B/en active Pending
-
1960
- 1960-11-07 NL NL257697A patent/NL257697A/xx unknown
- 1960-11-09 BE BE596916A patent/BE596916A/en unknown
- 1960-11-10 CH CH1257160A patent/CH384625A/en unknown
- 1960-11-14 GB GB3908660A patent/GB902206A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE596916A (en) | 1961-03-01 |
NL257697A (en) | 1964-04-10 |
DE1086737B (en) | 1960-08-11 |
CH384625A (en) | 1964-11-30 |
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