GB610774A - Improvements in or relating to multiplex electric communication systems - Google Patents
Improvements in or relating to multiplex electric communication systemsInfo
- Publication number
- GB610774A GB610774A GB11671/46A GB1167146A GB610774A GB 610774 A GB610774 A GB 610774A GB 11671/46 A GB11671/46 A GB 11671/46A GB 1167146 A GB1167146 A GB 1167146A GB 610774 A GB610774 A GB 610774A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- channel
- pulses
- generator
- output
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/10—Arrangements for reducing cross-talk between channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1676—Time-division multiplex with pulse-position, pulse-interval, or pulse-width modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
Abstract
610,774. Multiplex pulse signalling. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and REEVES, A. H. April 16, 1946, No. 11671. [Class 40 (v)] In a multi-channel time modulated pulse communication system, in which the trains of channel pulses are interleaved to form a combined train, a train of unmodulated pulses is also interleaved therewith, and the pulses are so timed that the period separating each modulated pulse from the preceding pulse depends only on the instantaneous signal voltage corresponding to the said modulated pulse. At the transmitter, a master pulse generator 8, Fig. 2, produces a train of synchronizing pulses supplied over conductor 15 to a channel mixing valve 13 feeding the communication channel from output terminal 23. The channel pulse generators 10A, 10B ... 10N are connected in tandem, each being triggered over conductors 14A, 14B, &c. by the output pulse from the preceding generator except 10A which is triggered from the generator 8. Each channel pulse generator comprises a triggered flip-flop multi-vibrator, Fig. 3 (not shown), the inversion time of which depends on the channel modulating signal applied to the terminals 11A, 11B ... 11N, the short pulse arising at the instant of inversion serving as the channel pulse and the triggering pulse for the next channel pulse generator. Rectifiers such as 16 are provided in all the individual pulse output leads to isolate the various output circuits. At the receiver, Fig. 4, the pulse separator 52 derives the synchronizing pulses, which are transmitted with a greater amplitude than that of the channel pulses, and they are used to synchronize a pulse generator 54. The output of the latter is fed to the first 56A of a series of channel selectors 56A ... 56N to switch a relaxation oscillator, Fig. 5 (not shown), from its first to its second stable condition. The receipt of the first channel pulse returns the circuit to its first stable position so that a rectangular pulse, of duration equal to the interval between the two operating pulses, is generated and passed to the Pulse demodulator 59A ... 59N. A differential pulse derived from the trailing edge of this rectangular pulse is fed to the next channel selector to initiate its operation which is terminated by the next channel pulse and so on. The circuit of the demodulators 59A ... 59N is designed to eliminate cross-talk between the channels arising from phase modulation of the duration modulated pulses with which it is fed. It comprises two condensers 87A, 87B, Fig. 6, charged by odd- and even-numbered pulses respectively from the line 60 through circuits 96A ... 99A and 96B ... 99B respectively, each of which comprises a rectifier. The change due to one pulse raises the potential of the condenser to a value just insufficient to break down the gas-filled diodes 100A, 100B respectively and persists until the next ineffective pulse raises the potential above the break-down voltage to discharge the condenser. The persisting potentials thus produced on the condensers are proportional to the pulse durations only and are mixed in the double triode 88 and fed through transformer 92 to the signal reproducer. Rectifiers 102A, 102B prevent negative potentials from being applied to the condensers and biassed rectifier 115 clips the voltages in the output circuit due to the extra momentary changes the condensers receive to break down the diodes 100A, 100B. To initiate the correct action of the circuit, the ganged switches 110, 111 are closed to charge condenser 87A and discharge condenser 87B.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11671/46A GB610774A (en) | 1946-04-16 | 1946-04-16 | Improvements in or relating to multiplex electric communication systems |
FR1014487D FR1014487A (en) | 1946-04-16 | 1947-03-20 | Multiplex electrical communication systems |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1014487X | 1946-04-16 | ||
GB11671/46A GB610774A (en) | 1946-04-16 | 1946-04-16 | Improvements in or relating to multiplex electric communication systems |
GB273559X | 1946-04-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB610774A true GB610774A (en) | 1948-10-20 |
Family
ID=34841437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11671/46A Expired GB610774A (en) | 1946-04-16 | 1946-04-16 | Improvements in or relating to multiplex electric communication systems |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1014487A (en) |
GB (1) | GB610774A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2615986A (en) * | 1948-01-20 | 1952-10-28 | Meguer V Kalfaian | Phase modulation system |
US2641699A (en) * | 1948-03-27 | 1953-06-09 | Gloess Paul Francois Marie | Multiplex pulse time modulation system |
US2680151A (en) * | 1949-01-14 | 1954-06-01 | Philco Corp | Multichannel communication system |
US2760002A (en) * | 1949-10-17 | 1956-08-21 | Hartford Nat Bank & Trust Co | Time-multiplex pulse modulation communication system |
EP0012979A1 (en) * | 1978-12-27 | 1980-07-09 | Siemens Aktiengesellschaft | Method for the transmission of several signals via a lightwave guide link, in particular between an exchange and a subscriber's connection |
-
1946
- 1946-04-16 GB GB11671/46A patent/GB610774A/en not_active Expired
-
1947
- 1947-03-20 FR FR1014487D patent/FR1014487A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2615986A (en) * | 1948-01-20 | 1952-10-28 | Meguer V Kalfaian | Phase modulation system |
US2641699A (en) * | 1948-03-27 | 1953-06-09 | Gloess Paul Francois Marie | Multiplex pulse time modulation system |
US2680151A (en) * | 1949-01-14 | 1954-06-01 | Philco Corp | Multichannel communication system |
US2760002A (en) * | 1949-10-17 | 1956-08-21 | Hartford Nat Bank & Trust Co | Time-multiplex pulse modulation communication system |
EP0012979A1 (en) * | 1978-12-27 | 1980-07-09 | Siemens Aktiengesellschaft | Method for the transmission of several signals via a lightwave guide link, in particular between an exchange and a subscriber's connection |
Also Published As
Publication number | Publication date |
---|---|
FR1014487A (en) | 1952-08-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2048081A (en) | Communication system | |
US2199634A (en) | Secret communication system | |
GB601931A (en) | Multi-channel communication system | |
GB646050A (en) | Improvements in or relating to electric pulse code modulation systems of communication | |
US2454815A (en) | Multichannel pulse communication system employing complex multivibrator modulators | |
GB673354A (en) | Improvements in or relating to electric signal communication systems | |
GB583541A (en) | Improvements in or relating to pulse modulation systems of electric communication | |
GB610774A (en) | Improvements in or relating to multiplex electric communication systems | |
US2554886A (en) | Synchronizing circuit for electrical commutators | |
GB634372A (en) | Improvements in or relating to pulse modulation signalling systems | |
US2760160A (en) | Electrical pulse modulators | |
GB669617A (en) | Improvements in or relating to electric pulse code modulation systems | |
US2510987A (en) | Multiplex time modulated electrical pulse demodulation system | |
US2546974A (en) | Pulse multiplex signaling system | |
US2517579A (en) | Multichannel pulse receiving system | |
US2543874A (en) | Electronic distributor | |
GB699889A (en) | Improvements in gating arrangements for pulse amplitude modulation time division multiplex signalling systems | |
US2851614A (en) | Device intended to convert a pulse into a new pulse having a steep leading edge | |
US2771553A (en) | Multiplex demodulator | |
US2556693A (en) | Electronic switch | |
US2906825A (en) | Device for selecting and transforming pulses in multi-channel pulse communication systems | |
US2483786A (en) | Synchronizing system for telegraphy | |
GB997992A (en) | Multiplex channel selector | |
US2592493A (en) | Pulse counter circuit | |
US2919308A (en) | Time division multiplex system for signals of different bandwidth |