GB478447A - Improvements in or relating to communication systems - Google Patents
Improvements in or relating to communication systemsInfo
- Publication number
- GB478447A GB478447A GB24935/36A GB2493536A GB478447A GB 478447 A GB478447 A GB 478447A GB 24935/36 A GB24935/36 A GB 24935/36A GB 2493536 A GB2493536 A GB 2493536A GB 478447 A GB478447 A GB 478447A
- Authority
- GB
- United Kingdom
- Prior art keywords
- distributer
- impulse
- battery
- transmitting
- condenser
- 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
- H04L25/4902—Pulse width modulation; Pulse position modulation
-
- 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
- H04L25/42—Transmitting circuits; Receiving circuits using mechanical distributors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Transmitters (AREA)
- Electrotherapy Devices (AREA)
Abstract
478,447. Type-printing telegraphy. STEVENS, A. H. (International Business Machines Corporation) Sept. 12, 1936, No. 24935. [Class 40 (iii)] In a system using transmitting and receiving distributers and in which each character is represented by a single impulse, the impulses are differentiated with respect to time and also polarity so that the number of segments on the distributers is halved. The transmitting distributer 50 makes at each contact and over normally closed contacts 32a controlled by a pair of keys such as A, N, charging circuits for the corresponding pair of condensers 38 connected to opposite poles of battery 40. Operation of a key shortcircuits the corresponding condenser either directly as shown or by means of key-controlled lever and cam mechanism such as that described in Specification 438,464, [Group XVI], so that when the distributer next makes contact the condenser is charged positively or negatively depending on its connection to the battery. The charging impulse is transmitted over transformer 46 and a line or wireless channel to the receiver comprising a pair of normally quiescent valves 62, 63 operated respectively by negative and positive impulses. Condenser discharges or battery directly controlled by the keys may alternatively be used for impulse transmission. The outputs of the valves are connected over amplifiers to printing magnets 18 in two sets connected in pairs to contacts of the receiving distributer 51 which is maintained in synchronism with the transmitting distributer in the manner described in Specification 442,596, a negative synchronizing impulse being transmitted over contact 20. The type-levers may be operated as described in Specification 438,464.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5768A US2079440A (en) | 1935-02-09 | 1935-02-09 | Communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB478447A true GB478447A (en) | 1938-01-19 |
Family
ID=10219603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24935/36A Expired GB478447A (en) | 1935-02-09 | 1936-09-12 | Improvements in or relating to communication systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US2079440A (en) |
DE (1) | DE700868C (en) |
FR (1) | FR812431A (en) |
GB (1) | GB478447A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2434681A (en) * | 1943-02-13 | 1948-01-20 | Bell Telephone Labor Inc | Remotely controlled electrical calculator |
-
1935
- 1935-02-09 US US5768A patent/US2079440A/en not_active Expired - Lifetime
-
1936
- 1936-09-12 GB GB24935/36A patent/GB478447A/en not_active Expired
- 1936-09-17 DE DE1936I0055963 patent/DE700868C/en not_active Expired
- 1936-09-19 FR FR812431D patent/FR812431A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE700868C (en) | 1941-01-02 |
US2079440A (en) | 1937-05-04 |
FR812431A (en) | 1937-05-10 |
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