GB521139A - Improvements in or relating to electric signalling systems - Google Patents
Improvements in or relating to electric signalling systemsInfo
- Publication number
- GB521139A GB521139A GB2020939A GB2020939A GB521139A GB 521139 A GB521139 A GB 521139A GB 2020939 A GB2020939 A GB 2020939A GB 2020939 A GB2020939 A GB 2020939A GB 521139 A GB521139 A GB 521139A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impulses
- repeaters
- speech
- line
- condition
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/04—Position modulation, i.e. PPM
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
- Amplifiers (AREA)
Abstract
521,139. Two - way repeating systems. STANDARD TELEPHONES & CABLES, Ltd. (Deloraine, E. M., and Reeves, A. H.). Nov. 1, 1938, No. 20209/39. Divided out of 509,820. Drawings to Specification. [Class 40 (iv)] In a signal transmission system of the double pulse modulation type, that is one in which the momentary amplitude of the original signal is represented in the line by the position of a short signal impulse (which may be a direct current impulse or a burst of high frequency alternating current) in a time period the end of which is fixed by one of a stream of regularly recurring impulses of a similar kind which may or may not be transmitted, the same repeaters are used 'for both directions and are automatically brought into condition for repeating in the appropriate direction by the signals themselves. The repeaters are identical with some of those described in Specification 509,820 and are of the kind in which a multivibrator circuit normally sends direct current impulses to line or in which a high frequency oscillator coupled to the line is periodically quenched and the effect of received impulses is to alter the starting point of the multi-vibrator or quenching cycle. It is shown, since signals arriving in appropriate phase with respect to the impulses generated by a repeater drag the repeater into step with them, that if such repeaters are suitably spaced and if speech at the terminal station always causes an advance of the phase of impulses generated there, the whole system is brought automatically into condition for relaying in the direction of the speech and remains in that condition until speech is originated at the other end whereupon the direc- 'tion of relaying is reversed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3188937A GB509820A (en) | 1937-11-19 | 1937-11-19 | Improvements in or relating to electric signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB521139A true GB521139A (en) | 1940-05-13 |
Family
ID=10329902
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3188937A Expired GB509820A (en) | 1937-11-19 | 1937-11-19 | Improvements in or relating to electric signalling systems |
GB2020939A Expired GB521139A (en) | 1937-11-19 | 1938-11-01 | Improvements in or relating to electric signalling systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3188937A Expired GB509820A (en) | 1937-11-19 | 1937-11-19 | Improvements in or relating to electric signalling systems |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE971422C (en) |
GB (2) | GB509820A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419571A (en) * | 1943-07-01 | 1947-04-29 | Standard Telephones Cables Ltd | Selective pulsing device |
US2478919A (en) * | 1943-07-17 | 1949-08-16 | Rca Corp | Pulse type multiplex communication system |
US2533269A (en) * | 1941-08-29 | 1950-12-12 | Int Standard Electric Corp | Pulse radio communication system |
US2561421A (en) * | 1945-04-02 | 1951-07-24 | Seale Ray | Receiver-transmitter arrangement |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE912711C (en) * | 1941-12-13 | 1954-06-03 | Philips Nv | System for the transmission of telephony signals by means of carrier wave oscillations modulated by pulses of constant duration |
US2552496A (en) * | 1942-11-30 | 1951-05-08 | Rinia Herre | Receiver for modulated radiofrequency pulses |
GB611639A (en) * | 1946-04-30 | 1948-11-02 | Cinema Television Ltd | Improvements in or relating to relaying systems for telephony, television, facsimile and like methods of transmitting intelligence |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE398789C (en) * | 1923-03-03 | 1924-07-15 | L V Kramolin | Method and device for preventing eavesdropping on telephone and telegraph traffic by means of electrical waves and for multiple traffic by means of electromagnetic waves |
US1885826A (en) * | 1926-12-08 | 1932-11-01 | American Telephone & Telegraph | System of photography employing frequency modulation |
US1941447A (en) * | 1927-05-18 | 1933-12-26 | Edwin H Armstrong | Radio telephone signaling |
US1867567A (en) * | 1929-02-01 | 1932-07-19 | Rca Corp | Detection of frequency modulated signals |
DE549273C (en) * | 1929-04-24 | 1932-04-25 | Telefunken Gmbh | Procedure for eliminating disruptive pulse broadening or shifting |
GB372852A (en) * | 1931-02-25 | 1932-05-19 | Coventry Autom Telephones Ltd | Improvements in or relating to telegraph systems |
US2005111A (en) * | 1931-04-09 | 1935-06-18 | Rca Corp | Amplifier |
FR742972A (en) * | 1931-09-23 | 1933-03-21 | ||
NL44760C (en) * | 1933-01-24 | 1900-01-01 | ||
US2061734A (en) * | 1934-09-29 | 1936-11-24 | Rca Corp | Signaling system |
US2086918A (en) * | 1935-08-22 | 1937-07-13 | Rca Corp | Method of frequency or phase modulation |
NL88393C (en) * | 1937-06-18 |
-
1937
- 1937-11-19 GB GB3188937A patent/GB509820A/en not_active Expired
-
1938
- 1938-11-01 GB GB2020939A patent/GB521139A/en not_active Expired
- 1938-11-16 DE DEI3378D patent/DE971422C/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533269A (en) * | 1941-08-29 | 1950-12-12 | Int Standard Electric Corp | Pulse radio communication system |
US2419571A (en) * | 1943-07-01 | 1947-04-29 | Standard Telephones Cables Ltd | Selective pulsing device |
US2478919A (en) * | 1943-07-17 | 1949-08-16 | Rca Corp | Pulse type multiplex communication system |
US2561421A (en) * | 1945-04-02 | 1951-07-24 | Seale Ray | Receiver-transmitter arrangement |
Also Published As
Publication number | Publication date |
---|---|
GB509820A (en) | 1939-07-19 |
DE971422C (en) | 1959-01-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2262838A (en) | Electric signaling system | |
GB623415A (en) | Improvements in or relating to multichannel electric pulse communication systems | |
GB521139A (en) | Improvements in or relating to electric signalling systems | |
GB1485156A (en) | Radiating line telecommunication systems | |
GB656023A (en) | Improvements in time division multiplex communication systems | |
GB1047584A (en) | Improvements in radar systems | |
GB715452A (en) | Two-way communication system | |
GB1360995A (en) | Relaying system with time delay signal device | |
US2533269A (en) | Pulse radio communication system | |
GB1289378A (en) | ||
GB1019828A (en) | Electronic system for sending, receiving and regenerating teleprinter signals | |
US3072744A (en) | Pulse transmission system | |
GB703247A (en) | Improvements in or relating to electric pulse communication systems | |
GB641888A (en) | Improvements in or relating to electric signalling systems | |
GB613741A (en) | Improvements in or relating to radio and other transmitting and receiving systems | |
US2336362A (en) | Telegraph system | |
GB970142A (en) | Simplex telegraph system with break-in facility | |
FR2281026A1 (en) | Telephonic signalling retransmission circuit - uses electromagnetic relays to match rotary and pulse modulation systems | |
GB1131659A (en) | Method of synchronisation in digital communication systems | |
GB964170A (en) | A data transmission arrangement utilising frequency shift or phase shift carrier signalling | |
US1595142A (en) | Means for preventing bias in telegraph systems | |
GB652882A (en) | Improvements in and relating to pulse signalling systems | |
GB1212908A (en) | Improvements in or relating to pulse code modulation transmission systems | |
GB1388397A (en) | Digital signal transmission systems | |
GB968279A (en) | Data transmission system |