GB1444821A - Distortion correcting devices for partial response signals - Google Patents
Distortion correcting devices for partial response signalsInfo
- Publication number
- GB1444821A GB1444821A GB4571173A GB4571173A GB1444821A GB 1444821 A GB1444821 A GB 1444821A GB 4571173 A GB4571173 A GB 4571173A GB 4571173 A GB4571173 A GB 4571173A GB 1444821 A GB1444821 A GB 1444821A
- Authority
- GB
- United Kingdom
- Prior art keywords
- equalizer
- shift register
- output
- partial response
- amplifiers
- 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
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
- H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
-
- 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
- H04L25/497—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 by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
Abstract
1444821 Equalizer for partial response signals SIEMENS AG 1 Oct 1973 [5 Jan 1973] 45711/73 Heading H4R In an equalizer for a transmission system employing partial response signalling tap gains of a transversal filter are adjusted by correlation of an error signal derived from the equalizer output with a signal from an adder combining signals from more than one tap of the equalizer delay device. As described the signal is of the form where a "1" is transmitted as the sequence "+1, 0, - 1," and the signal received from the transmission system is applied to the shift register having stages 26, 27, 28, connected by variable gain amplifiers 45, 46, 47, 48 to an adder 23 from which the output of the equalizer is derived. The equalizer output feeds both directly, and via a theoretical value detector and inverter 37 to the respective inputs of the adder 24 so as to derive an error signal which is fed to the correlators 35, and 36. Also fed to the correlators are signals from adders 21 and 22 each of which derives its inputs from points on the shift register spaced by two stages, and the output of the correlators is used to modify the gain settings of the respective amplifiers 47, 48. The shift register 26, 27, 28 and amplifiers 45, 46, 47, 48, remove the pre-pulse distortion while post pulse distortion is removed by the shift register 30, 31, 32, 33, and variable gain amplifiers 49, 50, which portion of the equalizer is the subject of the Specification 1,444,322.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732300480 DE2300480C3 (en) | 1973-01-05 | Equalizer for partial information signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1444821A true GB1444821A (en) | 1976-08-04 |
Family
ID=5868370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4571173A Expired GB1444821A (en) | 1973-01-05 | 1973-10-01 | Distortion correcting devices for partial response signals |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS49103554A (en) |
| BE (1) | BE809415A (en) |
| CH (1) | CH574191A5 (en) |
| FR (1) | FR2213627B1 (en) |
| GB (1) | GB1444821A (en) |
| IT (1) | IT1000747B (en) |
| LU (1) | LU69101A1 (en) |
| NL (1) | NL7317794A (en) |
| SE (1) | SE385073B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439863A (en) * | 1980-11-28 | 1984-03-27 | Rockwell International Corporation | Partial response system with simplified detection |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3356947A (en) * | 1963-12-23 | 1967-12-05 | Cardion Electronics Inc | Wave-signal dispersion correcting network |
| US3311836A (en) * | 1964-12-07 | 1967-03-28 | Cardion Electronics Inc | System for translating pulse signals accompanied by spurious side pulses |
| US3508153A (en) * | 1967-09-11 | 1970-04-21 | Bell Telephone Labor Inc | Automatic equalizer for partial-response data transmission systems |
-
1973
- 1973-10-01 GB GB4571173A patent/GB1444821A/en not_active Expired
- 1973-11-21 CH CH1641973A patent/CH574191A5/xx unknown
- 1973-12-21 IT IT5450173A patent/IT1000747B/en active
- 1973-12-27 JP JP433874A patent/JPS49103554A/ja active Pending
- 1973-12-28 NL NL7317794A patent/NL7317794A/xx not_active Application Discontinuation
- 1973-12-28 FR FR7347069A patent/FR2213627B1/fr not_active Expired
-
1974
- 1974-01-03 LU LU69101A patent/LU69101A1/xx unknown
- 1974-01-04 BE BE139537A patent/BE809415A/en unknown
- 1974-01-04 SE SE7400097A patent/SE385073B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439863A (en) * | 1980-11-28 | 1984-03-27 | Rockwell International Corporation | Partial response system with simplified detection |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2300480A1 (en) | 1974-07-11 |
| NL7317794A (en) | 1974-07-09 |
| JPS49103554A (en) | 1974-10-01 |
| FR2213627B1 (en) | 1976-06-25 |
| BE809415A (en) | 1974-07-04 |
| SE385073B (en) | 1976-05-31 |
| IT1000747B (en) | 1976-04-10 |
| LU69101A1 (en) | 1974-08-19 |
| FR2213627A1 (en) | 1974-08-02 |
| DE2300480B2 (en) | 1976-06-10 |
| CH574191A5 (en) | 1976-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |