SE8200367L - SIGNAL expander - Google Patents
SIGNAL expanderInfo
- Publication number
- SE8200367L SE8200367L SE8200367A SE8200367A SE8200367L SE 8200367 L SE8200367 L SE 8200367L SE 8200367 A SE8200367 A SE 8200367A SE 8200367 A SE8200367 A SE 8200367A SE 8200367 L SE8200367 L SE 8200367L
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- input
- expander
- amplifier
- variable gain
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
Abstract
In a signal expander, the envelope of an input signal (S1) to be expanded is detected (30) and applied as a control signal (S3) to the gain control input (18) of a variable gain device (14) which expands the input signal. The control signal is applied to the variable gain device via an adaptive filter (40) having improved ripple reduction and transient performance characteristics to minimize audibility of gain changes. The adaptive filter includes a low pass filter (50,52) for producing a smoothed control signal essentially free of ripple and an analog gate (70,74,78) for coupling the greater of the smoothed signal or a further signal to the variable gain device, the further signal being equal to the detector output signal less a constant. Compression of an input signal is provided by applying the input signal to the non-inverting input (110) fig 3 not shown of an amplifier (100) and feeding the (compressed) output signal (S1) of the amplifier to the expander (30,40, 14) and feeding the output signal (S2) of the expander to the inverting input of the amplifier (100). <IMAGE>
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22951881A | 1981-01-29 | 1981-01-29 | |
| US06/229,743 US4377788A (en) | 1981-01-29 | 1981-01-29 | Signal expander |
| US06/258,432 US4398157A (en) | 1981-01-29 | 1981-04-28 | Signal expander/compressor with adaptive control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8200367A0 SE8200367A0 (en) | 1982-07-30 |
| SE8200367L true SE8200367L (en) | 1982-07-30 |
Family
ID=27397963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8200367A SE8200367L (en) | 1981-01-29 | 1982-01-22 | SIGNAL expander |
Country Status (11)
| Country | Link |
|---|---|
| KR (1) | KR830009703A (en) |
| AU (1) | AU544439B2 (en) |
| DE (1) | DE3202951C2 (en) |
| DK (1) | DK38682A (en) |
| ES (1) | ES8308457A1 (en) |
| FR (1) | FR2498850A1 (en) |
| GB (1) | GB2094594B (en) |
| IT (1) | IT1140449B (en) |
| NL (1) | NL8200321A (en) |
| PT (1) | PT74105B (en) |
| SE (1) | SE8200367L (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8701365D0 (en) * | 1987-01-22 | 1987-02-25 | Thomas L D | Signal level control |
| SE9801235L (en) * | 1998-04-08 | 1999-10-09 | Anders Gingsjoe | Device and method for reducing transients |
| DE10122922A1 (en) * | 2001-05-11 | 2002-11-14 | Mgp Instr Gmbh | Measured data fluctuation suppression comprises feeding signals into filter, subtracting output signal from control signal, and feeding difference signal to comparator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1044004A (en) * | 1962-06-07 | 1966-09-28 | Emi Ltd | Improvements in or relating to circuits for compressing or expanding the amplitude range of an input signal |
| US3732371A (en) * | 1971-05-10 | 1973-05-08 | Richard S Burwen | Wide dynamic range noise masking compandor |
| DE2306152A1 (en) * | 1973-02-08 | 1974-08-15 | Grundig Emv | AUTOMATIC GAIN CONTROL |
| US3980964A (en) * | 1974-05-20 | 1976-09-14 | Grodinsky Robert M | Noise reduction circuit |
| US4024463A (en) * | 1976-05-03 | 1977-05-17 | Rockwell International Corporation | A.C. amplifier automatic gain control fast attack circuit |
| DE2803751C2 (en) * | 1978-01-28 | 1982-06-09 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Circuit for automatic dynamic compression or expansion |
| US4220929A (en) * | 1978-12-26 | 1980-09-02 | Dbx, Inc. | Signal expander |
| GB2040616B (en) * | 1979-01-17 | 1983-01-26 | Racal Dana Instr Ltd | Electrical circuit arrangements |
-
1981
- 1981-12-09 PT PT74105A patent/PT74105B/en unknown
- 1981-12-31 IT IT25956/81A patent/IT1140449B/en active
-
1982
- 1982-01-22 AU AU79758/82A patent/AU544439B2/en not_active Expired - Fee Related
- 1982-01-22 SE SE8200367A patent/SE8200367L/en not_active Application Discontinuation
- 1982-01-22 ES ES508964A patent/ES8308457A1/en not_active Expired
- 1982-01-26 KR KR1019820000318A patent/KR830009703A/en unknown
- 1982-01-27 GB GB8202295A patent/GB2094594B/en not_active Expired
- 1982-01-28 FR FR8201337A patent/FR2498850A1/en not_active Withdrawn
- 1982-01-28 NL NL8200321A patent/NL8200321A/en not_active Application Discontinuation
- 1982-01-28 DK DK38682A patent/DK38682A/en not_active Application Discontinuation
- 1982-01-29 DE DE3202951A patent/DE3202951C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2498850A1 (en) | 1982-07-30 |
| IT1140449B (en) | 1986-09-24 |
| KR830009703A (en) | 1983-12-22 |
| PT74105B (en) | 1983-06-15 |
| IT8125956A0 (en) | 1981-12-31 |
| GB2094594A (en) | 1982-09-15 |
| ES508964A0 (en) | 1983-06-16 |
| DE3202951C2 (en) | 1984-08-09 |
| ES8308457A1 (en) | 1983-06-16 |
| SE8200367A0 (en) | 1982-07-30 |
| AU7975882A (en) | 1982-08-05 |
| AU544439B2 (en) | 1985-05-30 |
| DK38682A (en) | 1982-07-30 |
| GB2094594B (en) | 1984-10-24 |
| PT74105A (en) | 1982-01-01 |
| DE3202951A1 (en) | 1982-08-26 |
| NL8200321A (en) | 1982-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NAV | Patent application has lapsed |
Ref document number: 8200367-4 |