FR2457599B1 - Appareillage pour enregistrer et/ou reproduire un signal d'information et comportant au moins un circuit de commande de gain pour un systeme de reduction de bruit - Google Patents
Appareillage pour enregistrer et/ou reproduire un signal d'information et comportant au moins un circuit de commande de gain pour un systeme de reduction de bruitInfo
- Publication number
- FR2457599B1 FR2457599B1 FR8011596A FR8011596A FR2457599B1 FR 2457599 B1 FR2457599 B1 FR 2457599B1 FR 8011596 A FR8011596 A FR 8011596A FR 8011596 A FR8011596 A FR 8011596A FR 2457599 B1 FR2457599 B1 FR 2457599B1
- Authority
- FR
- France
- Prior art keywords
- reproducing
- recording
- control circuit
- noise reduction
- information signal
- 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
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
-
- 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)
- Multimedia (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6418179A JPS55156431A (en) | 1979-05-24 | 1979-05-24 | Noise reduction system |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2457599A1 FR2457599A1 (fr) | 1980-12-19 |
FR2457599B1 true FR2457599B1 (fr) | 1985-10-25 |
Family
ID=13250622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8011596A Expired FR2457599B1 (fr) | 1979-05-24 | 1980-05-23 | Appareillage pour enregistrer et/ou reproduire un signal d'information et comportant au moins un circuit de commande de gain pour un systeme de reduction de bruit |
Country Status (6)
Country | Link |
---|---|
US (1) | US4369509A (fr) |
JP (1) | JPS55156431A (fr) |
CA (1) | CA1150638A (fr) |
DE (1) | DE3019431C2 (fr) |
FR (1) | FR2457599B1 (fr) |
GB (1) | GB2052220B (fr) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57164609A (en) * | 1981-04-02 | 1982-10-09 | Sony Corp | Level detecting circuit |
CA1188384A (fr) * | 1981-12-29 | 1985-06-04 | Masayuki Katakura | Circuit reducteur de bruit |
JPS6012858U (ja) * | 1983-07-04 | 1985-01-28 | 日本ビクター株式会社 | ノイズリダクシヨン回路 |
US4628276A (en) * | 1983-12-15 | 1986-12-09 | Matsushita Graphic Communications Systems, Inc. | Logarithmically linearly controlled variable gain amplifier |
CA1263474A (fr) * | 1985-12-17 | 1989-11-28 | Hideki Fukasawa | Circuit de detection de niveaux numeriques |
JPH0734291B2 (ja) * | 1986-07-28 | 1995-04-12 | 株式会社日立製作所 | デイジタル信号記録再生システム |
JPH01204573A (ja) * | 1988-02-10 | 1989-08-17 | Sony Corp | 雑音低減回路 |
JPH0442012A (ja) * | 1990-06-06 | 1992-02-12 | Sumitomo Metal Ind Ltd | クラッド材の肉厚測定装置 |
JP2661404B2 (ja) * | 1991-05-21 | 1997-10-08 | 日本電気株式会社 | 携帯電話装置 |
JP4363834B2 (ja) * | 2002-02-19 | 2009-11-11 | 株式会社東芝 | X線コンピュータ断層撮影装置 |
US8400452B2 (en) * | 2008-05-08 | 2013-03-19 | Motorola Solutions, Inc. | Method and system for segmented propagation visualization |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3206556A (en) * | 1961-04-05 | 1965-09-14 | Columbia Broadcasting Syst Inc | Signal compression and expansion system |
US3379839A (en) * | 1964-12-07 | 1968-04-23 | Cons Electrodynamics Corp | Magnetic recording dynamic range compressor/expander system |
GB1120541A (en) * | 1965-08-11 | 1968-07-17 | Dolby Ray Milton | Improvements in noise reduction systems |
US3631365A (en) * | 1968-11-01 | 1971-12-28 | Dolby Laboratories Inc | Signal compressors and expanders |
BE753495A (fr) * | 1969-07-21 | 1970-12-16 | Dolby Laboratories Inc | Filtres limiteurs perfectionnes pour systemes attenuateurs de bruit. ( |
GB1390341A (en) * | 1971-03-12 | 1975-04-09 | Dolby Laboratories Inc | Signal compressors and expanders |
US3729693A (en) * | 1971-08-02 | 1973-04-24 | R Dolby | Compressor/expander switching methods and apparatus |
DE2312086C3 (de) * | 1972-03-30 | 1979-10-31 | N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande) | Signalübertragungsvorrichtung mit einer amplituden- und frequenzabhängigen Übertragungsfunktion |
GB1432763A (en) * | 1972-05-02 | 1976-04-22 | Dolby Laboratories Inc | Compressors expanders and noise reduction systems |
JPS5026324A (fr) * | 1973-07-07 | 1975-03-19 | ||
JPS52142409A (en) * | 1976-05-21 | 1977-11-28 | Toshiba Corp | Noise reduction system |
US4169219A (en) * | 1977-03-30 | 1979-09-25 | Beard Terry D | Compander noise reduction method and apparatus |
JPS5439516A (en) * | 1977-09-02 | 1979-03-27 | Sanyo Electric Co Ltd | Noise reduction unit |
-
1979
- 1979-05-24 JP JP6418179A patent/JPS55156431A/ja active Granted
-
1980
- 1980-05-19 US US06/151,154 patent/US4369509A/en not_active Expired - Lifetime
- 1980-05-21 DE DE3019431A patent/DE3019431C2/de not_active Expired - Fee Related
- 1980-05-22 GB GB8016972A patent/GB2052220B/en not_active Expired
- 1980-05-22 CA CA000352484A patent/CA1150638A/fr not_active Expired
- 1980-05-23 FR FR8011596A patent/FR2457599B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2052220A (en) | 1981-01-21 |
FR2457599A1 (fr) | 1980-12-19 |
DE3019431A1 (de) | 1980-11-27 |
JPS55156431A (en) | 1980-12-05 |
GB2052220B (en) | 1984-02-15 |
US4369509A (en) | 1983-01-18 |
DE3019431C2 (de) | 1993-10-14 |
JPS6216582B2 (fr) | 1987-04-13 |
CA1150638A (fr) | 1983-07-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |