SE316796B - - Google Patents
Info
- Publication number
- SE316796B SE316796B SE3576/66A SE357666A SE316796B SE 316796 B SE316796 B SE 316796B SE 3576/66 A SE3576/66 A SE 3576/66A SE 357666 A SE357666 A SE 357666A SE 316796 B SE316796 B SE 316796B
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- bit
- level
- circuit
- modulator
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband 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
- H04L25/49—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
-
- 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
- H04L25/4917—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 using multilevel codes
- H04L25/4923—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 using multilevel codes using ternary codes
- H04L25/4925—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 using multilevel codes using ternary codes using balanced bipolar ternary codes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Dc Digital Transmission (AREA)
Abstract
1,132,274. Data transmission systems. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 17 March, 1966 [20 March, 1965], No. 11697/66. Heading H4P. In a single sideband digital data transmission system the transmitter comprises a network having a transmission characteristic equivalent to that of a subtraction circuit to which a signal is fed both direct and via a delay. In a transmitter, Fig. 1 (not shown), binary pulses are converted to differential form (3, 4) and pass to the network (5) referred to above, the delay in this instance being one bit. After filtering (6), the resultant 3-level signals are amplitude modulated (7) in a suppressed carrier modulator, and one of the sidebands is passed to the transmission line. A pilot carrier is added to the signal from the modulator. At the receiver, Fig. 3 (not shown), the pilot is used in the demodulation (14), the 3-level signal being full-wave rectified (20) to recover binary data identical to that at the transmitter input. D.C. level variations are countered by subtracting (21) from the binary signal a D.C. signal, derived from the demodulator by filtering (22), and passing the difference signal through a threshold circuit (24). The resulting signal is sampled (25) for regeneration of the binary data. Level control of the received signals may be achieved by selecting from the demodulator output a component at twice the carrier frequency which is then rectified and used to control an attenuator preceding the modulator. In a modification, Fig. 8 (not shown), the demodulated three-level signal is sampled at bit rate, the samples passing to positive and negative threshold circuits (50, 51) which feed a bi-stable circuit (52). The signal from this circuit, which is in differential form, passes to a modulo 2 adder (55) both direct and via a 1-bit delay (54), the adder output being the required binary data. In a further embodiment, Figs. 10 and 11 (neither shown), generally similar to that described with reference to Figs. 1 and 3, a square wave at half bit-rate is added to the output of the subtractor (58), and at the receiver this signal is extracted by a filter (73), full wave rectified (75) and passed to a tuned filter (75) which develops a sine wave at bit frequency. This is clipped (76) and differentiated (77) to provide bit-rate sampling pulses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6503571A NL143772B (en) | 1965-03-20 | 1965-03-20 | TRANSMISSION SYSTEM FOR PULSE TRANSMISSION. |
Publications (1)
Publication Number | Publication Date |
---|---|
SE316796B true SE316796B (en) | 1969-11-03 |
Family
ID=19792705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE3576/66A SE316796B (en) | 1965-03-20 | 1966-03-17 |
Country Status (9)
Country | Link |
---|---|
AT (1) | AT262385B (en) |
BE (1) | BE678111A (en) |
BR (1) | BR6677934D0 (en) |
CH (1) | CH457539A (en) |
DE (1) | DE1279076B (en) |
DK (1) | DK116370B (en) |
GB (1) | GB1132274A (en) |
NL (1) | NL143772B (en) |
SE (1) | SE316796B (en) |
-
1965
- 1965-03-20 NL NL6503571A patent/NL143772B/en not_active IP Right Cessation
-
1966
- 1966-03-16 DE DEN28217A patent/DE1279076B/en active Pending
- 1966-03-17 CH CH387566A patent/CH457539A/en unknown
- 1966-03-17 AT AT255066A patent/AT262385B/en active
- 1966-03-17 GB GB1169766A patent/GB1132274A/en not_active Expired
- 1966-03-17 DK DK138866A patent/DK116370B/en unknown
- 1966-03-17 BR BR17793466A patent/BR6677934D0/en unknown
- 1966-03-17 SE SE3576/66A patent/SE316796B/xx unknown
- 1966-03-18 BE BE678111D patent/BE678111A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB1132274A (en) | 1968-10-30 |
BR6677934D0 (en) | 1973-12-18 |
BE678111A (en) | 1966-09-19 |
NL143772B (en) | 1974-10-15 |
DE1279076B (en) | 1968-10-03 |
NL6503571A (en) | 1966-09-21 |
CH457539A (en) | 1968-06-15 |
AT262385B (en) | 1968-06-10 |
DK116370B (en) | 1970-01-05 |
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