ES8303848A1 - Improvements in circuit arrangements for modifying dynamic range - Google Patents
Improvements in circuit arrangements for modifying dynamic rangeInfo
- Publication number
- ES8303848A1 ES8303848A1 ES508394A ES508394A ES8303848A1 ES 8303848 A1 ES8303848 A1 ES 8303848A1 ES 508394 A ES508394 A ES 508394A ES 508394 A ES508394 A ES 508394A ES 8303848 A1 ES8303848 A1 ES 8303848A1
- Authority
- ES
- Spain
- Prior art keywords
- circuits
- arrangements
- signal
- control signal
- circuit
- 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
- H03G9/12—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices
- H03G9/18—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices for tone control and volume expansion or compression
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
- H03G7/08—Volume compression or expansion in amplifiers having semiconductor devices incorporating negative feedback
-
- 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
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
The susceptibility of compressors, expanders and noise reduction circuits to undue control by signals outside the passband(s) in which the circuits are active is reduced. In a compressor which operates by narrowing the pass-band of a variable filter 22, the conventional feedback control via rectifier 31 and smoothing means 31, 32a, 32b is counteracted by a further signal derived from a wider frequency region by a rectifier 31' and smoothing circuit 32a'. The further signal bucks the main control signal in combining circuit 33. Similar arrangements are disclosed for arrangements using variable gain circuits instead of a variable filter and alternative arrangements use multichannel control signal circuits having limiters with different thresholds whereby the control signal is tailored to achieve like results. All arrangements reduce the circuit response to signal components outside the pass band(s) at high input signal levels.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/325,530 US4498055A (en) | 1981-09-10 | 1981-12-01 | Circuit arrangements for modifying dynamic range |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES8303848A1 true ES8303848A1 (en) | 1983-02-01 |
| ES508394A0 ES508394A0 (en) | 1983-02-01 |
Family
ID=23268273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES508394A Granted ES508394A0 (en) | 1981-12-01 | 1981-12-29 | "A CIRCUIT PROVISION TO MODIFY THE DYNAMIC MARGIN OF AN ENTRY SIGNAL". |
Country Status (15)
| Country | Link |
|---|---|
| KR (1) | KR900000483B1 (en) |
| BE (1) | BE901906Q (en) |
| CA (1) | CA1188996A (en) |
| CH (1) | CH656996A5 (en) |
| DE (1) | DE3151137A1 (en) |
| DK (1) | DK575681A (en) |
| ES (1) | ES508394A0 (en) |
| FR (1) | FR2517496B1 (en) |
| GB (1) | GB2111355B (en) |
| GR (1) | GR77317B (en) |
| IE (1) | IE52495B1 (en) |
| IT (1) | IT1140402B (en) |
| LU (1) | LU83854A1 (en) |
| NL (1) | NL192860C (en) |
| SE (1) | SE449281B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4922535A (en) * | 1986-03-03 | 1990-05-01 | Dolby Ray Milton | Transient control aspects of circuit arrangements for altering the dynamic range of audio signals |
| CA1269138A (en) * | 1986-03-03 | 1990-05-15 | Ray Milton Dolby | Attenuator circuit employing bootstrapping |
| JP2764205B2 (en) * | 1986-03-03 | 1998-06-11 | レ−・ミルトン・ドルビ | Bootstrap signal attenuation circuit |
| GB2429779A (en) * | 2005-09-01 | 2007-03-07 | Geo Kingsbury Machine Tools Lt | Testing components of drive trains |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1120541A (en) * | 1965-08-11 | 1968-07-17 | Dolby Ray Milton | Improvements in noise reduction systems |
| US3665345A (en) * | 1969-07-21 | 1972-05-23 | Dolby Laboratories Inc | Compressors and expanders for noise reduction systems |
| GB1367002A (en) * | 1971-04-06 | 1974-09-18 | Victor Company Of Japan | Compression and/or expansion system and circuit |
| US4101849A (en) * | 1976-11-08 | 1978-07-18 | Dbx, Inc. | Adaptive filter |
| BE889426A (en) * | 1980-06-30 | 1981-10-16 | Dolby Ray Milton | CIRCUIT FOR REDUCING THE EFFECTS OF OVERLOADING OF A SIGNAL RECORDING OR TRANSMISSION MEDIUM |
-
1981
- 1981-12-09 GB GB08137167A patent/GB2111355B/en not_active Expired
- 1981-12-11 CA CA000392068A patent/CA1188996A/en not_active Expired
- 1981-12-15 IE IE2951/81A patent/IE52495B1/en not_active IP Right Cessation
- 1981-12-15 SE SE8107495A patent/SE449281B/en not_active IP Right Cessation
- 1981-12-19 KR KR1019810005016A patent/KR900000483B1/en active
- 1981-12-22 CH CH8223/81A patent/CH656996A5/en not_active IP Right Cessation
- 1981-12-22 NL NL8105775A patent/NL192860C/en not_active IP Right Cessation
- 1981-12-23 DE DE19813151137 patent/DE3151137A1/en active Granted
- 1981-12-23 DK DK575681A patent/DK575681A/en not_active Application Discontinuation
- 1981-12-23 GR GR66897A patent/GR77317B/el unknown
- 1981-12-24 LU LU83854A patent/LU83854A1/en unknown
- 1981-12-28 FR FR8124314A patent/FR2517496B1/en not_active Expired
- 1981-12-29 ES ES508394A patent/ES508394A0/en active Granted
- 1981-12-29 IT IT25877/81A patent/IT1140402B/en active
-
1985
- 1985-03-08 BE BE0/214626A patent/BE901906Q/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE8107495L (en) | 1983-06-02 |
| KR830008462A (en) | 1983-11-18 |
| DE3151137A1 (en) | 1983-07-14 |
| IT8125877A0 (en) | 1981-12-29 |
| FR2517496B1 (en) | 1985-11-15 |
| CA1188996A (en) | 1985-06-18 |
| DK575681A (en) | 1983-06-02 |
| NL192860C (en) | 1998-03-04 |
| GR77317B (en) | 1984-09-11 |
| NL192860B (en) | 1997-11-03 |
| CH656996A5 (en) | 1986-07-31 |
| GB2111355B (en) | 1985-02-13 |
| LU83854A1 (en) | 1982-05-07 |
| NL8105775A (en) | 1983-07-01 |
| IE52495B1 (en) | 1987-11-25 |
| IT1140402B (en) | 1986-09-24 |
| SE449281B (en) | 1987-04-13 |
| FR2517496A1 (en) | 1983-06-03 |
| GB2111355A (en) | 1983-06-29 |
| IE812951L (en) | 1983-06-01 |
| ES508394A0 (en) | 1983-02-01 |
| DE3151137C2 (en) | 1993-04-01 |
| BE901906Q (en) | 1985-07-01 |
| KR900000483B1 (en) | 1990-01-30 |
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