GB1253031A - - Google Patents
Info
- Publication number
- GB1253031A GB1253031A GB1253031DA GB1253031A GB 1253031 A GB1253031 A GB 1253031A GB 1253031D A GB1253031D A GB 1253031DA GB 1253031 A GB1253031 A GB 1253031A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- expander
- limiting
- further path
- path
- 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
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
- H04B1/64—Volume compression or expansion arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1,253,031. Companders. R. M. DOLBY. 1 Jan., 1969 [10 Jan., 1968], No. 1540/68. Heading H4R. In a modification of the compander system of Specification 1,120,541 in the compressor the signal in the further path 10 is derived from the output of the adding network 12 and in the expander the signal in the further path 14 is derived from the input to the subtractor 16. The further path, as in the prior application, may include a number of parallel limiting circuits operating at different levels and/or on different frequency bands and may include tuned circuits to reject the carrier frequency in carrier systems, e.g. colour television systems. Fig. 6 shows a simple expander, which is of application to a television video signal and is an inverted form of the expander of Fig. 2 providing limiting and low frequency discrimination in the further path the signal from which is combined with that from the direct path via R1. For colour television a parallel resonant subcarrier rejector can replace or be connected in series with the capacitor. A down turning characteristic may be obtained by combining in opposition the signals from two further paths having the same limiting level but different slopes up to the limiting level.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB154068 | 1968-01-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1253031A true GB1253031A (en) | 1971-11-10 |
Family
ID=9723759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1253031D Expired GB1253031A (en) | 1968-01-10 | 1968-01-10 |
Country Status (11)
| Country | Link |
|---|---|
| JP (4) | JPS518284B1 (en) |
| AT (2) | AT303122B (en) |
| BE (1) | BE726177A (en) |
| CH (1) | CH501342A (en) |
| DE (1) | DE1900639B2 (en) |
| DK (1) | DK140299B (en) |
| FR (1) | FR1600207A (en) |
| GB (1) | GB1253031A (en) |
| NL (1) | NL161006C (en) |
| NO (2) | NO126505B (en) |
| SE (3) | SE350379B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2211347A1 (en) * | 1971-03-12 | 1972-09-28 | Dolby Laboratories Inc | Circuit arrangement for changing the dynamic range of signals |
| DE2237542A1 (en) * | 1971-08-02 | 1973-02-22 | Dolby Laboratories Inc | OPTIONAL SWITCHABLE SIGNAL COMPRESSOR / EXPANDER |
| DE2321686A1 (en) * | 1972-05-02 | 1973-11-08 | Dolby Laboratories Inc | CIRCUIT ARRANGEMENTS FOR INFLUENCING THE DYNAMIC AREA OF AN INPUT SIGNAL |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1438711A (en) * | 1973-01-23 | 1976-06-09 | Dolby Laboratories Inc | Calibration oscillators for noise reduction systems |
| US3909733A (en) * | 1973-05-17 | 1975-09-30 | Dolby Laboratories Inc | Dynamic range modifying circuits utilizing variable negative resistance |
| JPS5439516A (en) * | 1977-09-02 | 1979-03-27 | Sanyo Electric Co Ltd | Noise reduction unit |
| DE2856045A1 (en) * | 1978-12-23 | 1980-07-10 | Licentia Gmbh | CIRCUIT FOR SELECTING AUTOMATIC DYNAMIC COMPRESSION OR EXPANSION |
| DE2919280A1 (en) * | 1979-05-12 | 1980-11-20 | Licentia Gmbh | CIRCUIT FOR SELECTING AUTOMATIC DYNAMIC COMPRESSION OR EXPANSION |
| DK156356C (en) * | 1980-06-30 | 1989-12-27 | Ray Milton Dolby | CIRCUIT TO REDUCE OVERLOAD EFFECTS IN SIGNAL RECORDING AND TRANSMISSION SYSTEMS |
| JP2005175674A (en) * | 2003-12-09 | 2005-06-30 | Nec Corp | Signal compression/decompression device and portable communication terminal |
| JP7165277B1 (en) * | 2022-02-02 | 2022-11-02 | 幾美 相澤 | Reused food product and method for manufacturing reusable food product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3111635A (en) | 1960-05-05 | 1963-11-19 | Fairchild Recording Equipment | Method and apparatus for eliminating overloading in modulating systems having pre-emphasis means |
| FR1489458A (en) | 1965-08-13 | 1967-07-21 | Ford France | Radiation curable paint binder |
-
1968
- 1968-01-10 GB GB1253031D patent/GB1253031A/en not_active Expired
- 1968-12-27 BE BE726177D patent/BE726177A/xx not_active IP Right Cessation
- 1968-12-31 FR FR1600207D patent/FR1600207A/fr not_active Expired
-
1969
- 1969-01-06 NO NO4969A patent/NO126505B/no unknown
- 1969-01-06 NL NL6900209A patent/NL161006C/en not_active IP Right Cessation
- 1969-01-07 CH CH12869A patent/CH501342A/en not_active IP Right Cessation
- 1969-01-08 DE DE19691900639 patent/DE1900639B2/en not_active Ceased
- 1969-01-09 DK DK12669A patent/DK140299B/en not_active IP Right Cessation
- 1969-01-09 SE SE23669A patent/SE350379B/xx unknown
- 1969-01-09 JP JP153269A patent/JPS518284B1/ja active Pending
- 1969-01-09 SE SE1768670A patent/SE366623B/xx unknown
- 1969-01-09 SE SE1768570A patent/SE367106B/xx unknown
- 1969-01-10 AT AT22669A patent/AT303122B/en not_active IP Right Cessation
- 1969-01-10 AT AT47171A patent/AT308832B/en not_active IP Right Cessation
-
1971
- 1971-02-24 NO NO68971A patent/NO128842B/no unknown
-
1972
- 1972-02-12 JP JP1513872A patent/JPS518767B1/ja active Pending
- 1972-02-12 JP JP1513972A patent/JPS518768B1/ja active Pending
-
1975
- 1975-10-11 JP JP12336675A patent/JPS531602B1/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2211347A1 (en) * | 1971-03-12 | 1972-09-28 | Dolby Laboratories Inc | Circuit arrangement for changing the dynamic range of signals |
| DE2237542A1 (en) * | 1971-08-02 | 1973-02-22 | Dolby Laboratories Inc | OPTIONAL SWITCHABLE SIGNAL COMPRESSOR / EXPANDER |
| DE2321686A1 (en) * | 1972-05-02 | 1973-11-08 | Dolby Laboratories Inc | CIRCUIT ARRANGEMENTS FOR INFLUENCING THE DYNAMIC AREA OF AN INPUT SIGNAL |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1900639B2 (en) | 1976-04-01 |
| FR1600207A (en) | 1970-07-20 |
| DK140299B (en) | 1979-07-23 |
| NL161006C (en) | 1979-12-17 |
| DK140299C (en) | 1980-01-14 |
| CH501342A (en) | 1970-12-31 |
| SE350379B (en) | 1972-10-23 |
| DE1900639A1 (en) | 1969-07-31 |
| SE367106B (en) | 1974-05-13 |
| AT308832B (en) | 1973-06-15 |
| BE726177A (en) | 1969-05-29 |
| JPS531602B1 (en) | 1978-01-20 |
| SE366623B (en) | 1974-04-29 |
| NO126505B (en) | 1973-02-12 |
| JPS518284B1 (en) | 1976-03-16 |
| NO128842B (en) | 1974-01-14 |
| NL6900209A (en) | 1969-07-14 |
| NL161006B (en) | 1979-07-16 |
| JPS518767B1 (en) | 1976-03-19 |
| AT303122B (en) | 1972-11-10 |
| JPS518768B1 (en) | 1976-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |