GB689380A - Method of modulation and demodulation for pulse-type telecommunication system - Google Patents
Method of modulation and demodulation for pulse-type telecommunication systemInfo
- Publication number
- GB689380A GB689380A GB927/52A GB92752A GB689380A GB 689380 A GB689380 A GB 689380A GB 927/52 A GB927/52 A GB 927/52A GB 92752 A GB92752 A GB 92752A GB 689380 A GB689380 A GB 689380A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- line
- fed
- pulse train
- pulse
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/04—Demodulating pulses which have been modulated with a continuously-variable signal of position-modulated pulses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/026—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse time characteristics modulation, e.g. width, position, interval
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Devices For Supply Of Signal Current (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
689,380. Multiplex pulse signalling. COMPAGNIE INDUSTRIELLE DES TELEPHONES. Jan. 11, 1952 [March 10, 1951], No. 927/52. Class 40 (v). Position - modulated pulses are produced by adding to an unmodulated pulse train, pulses derived by differentiating amplitude modulated pulses of the same phase and recurrence frequency. Demodulation is effected by integrating the sum of the modulated pulse train and an unmodulated pulse train of opposite polarity and the same recurrence frequency and mean phase. In the embodiment described one go and return terminal channel circuit of a multiplex communication system is shown inside the frame of dotted lines, the remainder of the circuit being common to all the channels at the terminal. The master oscillator 1 controls a pulse generator 2 which energizes the synchronizing pulse generator 3 connected to the outgoing line. Generator 2 also feeds the delay line distributer 4, from a tapping on which a pulse train is fed to the amplitude modulator 8 supplied with voice current from the hybrid transformer 9. The amplitude modulated pulses together with those from the other channel circuits are fed through valve 11 to the short-circuited line differentiator 12. The resulting pulse train is added to an unmodulated train derived from all the tappings on the distributer 4 through resistances 14, and fed to the limiter valve 15 and thence to line. Modulated pulses from the incoming line are applied to the synchronizing pulse separator 18, the output pulses of which are fed to the delay line distributer 19. The unmodulated pulse train derived through resistances 20 from all the delay line tappings is applied through limiter 21 to the grid of valve 17, together with the opposite polarity modulated pulses from transformer 16. The combined pulses are integrated by the open line 22 to produce amplitude modulated pulses which are fed to all the channel gating circuits. In the channel circuit shown the gating takes place in circuit 25 which receives gating pulses from one of the tappings on line 19. The output pulses are fed to a low-pass filter 28 and the recovered voice signal is passed to the hybrid transformer 9.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR956772X | 1951-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB689380A true GB689380A (en) | 1953-03-25 |
Family
ID=9487746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB927/52A Expired GB689380A (en) | 1951-03-10 | 1952-01-11 | Method of modulation and demodulation for pulse-type telecommunication system |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE509788A (en) |
CH (1) | CH303845A (en) |
DE (1) | DE956772C (en) |
FR (1) | FR1033817A (en) |
GB (1) | GB689380A (en) |
NL (2) | NL80210C (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2467793A (en) * | 1945-05-19 | 1949-04-19 | Westinghouse Electric Corp | Radio communication system |
-
0
- NL NL7505302.A patent/NL161454B/en unknown
- BE BE509788D patent/BE509788A/xx unknown
- NL NL80210D patent/NL80210C/xx active
-
1951
- 1951-03-10 FR FR1033817D patent/FR1033817A/en not_active Expired
-
1952
- 1952-01-11 GB GB927/52A patent/GB689380A/en not_active Expired
- 1952-03-07 CH CH303845D patent/CH303845A/en unknown
- 1952-03-08 DE DEC5507A patent/DE956772C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH303845A (en) | 1954-12-15 |
NL80210C (en) | |
FR1033817A (en) | 1953-07-16 |
NL161454B (en) | |
BE509788A (en) | |
DE956772C (en) | 1957-01-24 |
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