GB1406720A - Apparatus and method for reducing muliplicative gain variation distortions - Google Patents
Apparatus and method for reducing muliplicative gain variation distortionsInfo
- Publication number
- GB1406720A GB1406720A GB4502572A GB4502572A GB1406720A GB 1406720 A GB1406720 A GB 1406720A GB 4502572 A GB4502572 A GB 4502572A GB 4502572 A GB4502572 A GB 4502572A GB 1406720 A GB1406720 A GB 1406720A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- receiver
- successive
- ratios
- data
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1496—Digital recording or reproducing using self-clocking codes characterised by the use of more than three levels
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Noise Elimination (AREA)
Abstract
1406720 Gain control arrangement SPERRY RAND CORP 29 Sept 1972 [29 Oct 1971] 45025/72 Heading H4R In a data transmission system for either analogue or mutli-level digital transmission the incoming data from store 26, Fig. 2, is fed through a device 30 which provides a power function of the input signal, e.g. #<SP>x</SP> where # is a constant and x the input signal, for transmission. At the receiver, Fig. 3, the received signals are fed through a device 43 providing a logarithmic function, which restores the data to its original form and reduces any multiplicative distortion provided by the transmission system to additive distortion, having a smaller effect. Preferably the signals, before conversion to power functions, are added in modulo fashion in accumulator 29, and at the receiver differences are taken between successive signals in subtractor 47, also in modulo fashion, so that slowly varying multiplicative distortion, e.g. gain changes, have little or no effect on the output accuracy. An alternative arrangement, Fig. 9 (not shown), converts the input signals to power functions (in 126) and multiplies successive signal sample functions together (at 127) and/or at the receiver Fig. 11 (not shown) the input signals have the ratios between successive samples taken (at 151) before determining the log of the ratios (at 156). The arrangement is a mathematical equivalent of the first system with the order of the components reversed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19389871A | 1971-10-29 | 1971-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1406720A true GB1406720A (en) | 1975-09-17 |
Family
ID=22715470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4502572A Expired GB1406720A (en) | 1971-10-29 | 1972-09-29 | Apparatus and method for reducing muliplicative gain variation distortions |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS4858812A (en) |
| DE (1) | DE2253132A1 (en) |
| FR (1) | FR2158005A1 (en) |
| GB (1) | GB1406720A (en) |
| IT (1) | IT966830B (en) |
| NL (1) | NL7214584A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210288843A1 (en) * | 2020-03-16 | 2021-09-16 | Micron Technology, Inc. | Linear equalization, and associated methods, devices, and systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1381444A (en) * | 1962-10-23 | 1964-12-14 | Int Standard Electric Corp | Nonlinear quantization coding device |
| US3397396A (en) * | 1963-01-30 | 1968-08-13 | Nippon Electric Co | Decoding device with a nonlinear companding characteristic |
| FR1559633A (en) * | 1967-10-12 | 1969-03-14 |
-
1972
- 1972-09-29 GB GB4502572A patent/GB1406720A/en not_active Expired
- 1972-10-27 IT IT5368772A patent/IT966830B/en active
- 1972-10-27 FR FR7238154A patent/FR2158005A1/fr active Pending
- 1972-10-27 NL NL7214584A patent/NL7214584A/xx unknown
- 1972-10-30 DE DE19722253132 patent/DE2253132A1/en active Pending
- 1972-10-30 JP JP10878472A patent/JPS4858812A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2158005A1 (en) | 1973-06-08 |
| IT966830B (en) | 1974-02-20 |
| JPS4858812A (en) | 1973-08-17 |
| DE2253132A1 (en) | 1973-05-10 |
| NL7214584A (en) | 1973-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |