FR2375762A1 - Chaine de transfert pour signaux a large bande, en particulier systeme d'enregistrement/lecture de signaux video - Google Patents

Chaine de transfert pour signaux a large bande, en particulier systeme d'enregistrement/lecture de signaux video

Info

Publication number
FR2375762A1
FR2375762A1 FR7739270A FR7739270A FR2375762A1 FR 2375762 A1 FR2375762 A1 FR 2375762A1 FR 7739270 A FR7739270 A FR 7739270A FR 7739270 A FR7739270 A FR 7739270A FR 2375762 A1 FR2375762 A1 FR 2375762A1
Authority
FR
France
Prior art keywords
frequency
signals
transfer chain
wideband
recording
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.)
Withdrawn
Application number
FR7739270A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of FR2375762A1 publication Critical patent/FR2375762A1/fr
Withdrawn legal-status Critical Current

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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/923—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback using preemphasis of the signal before modulation and deemphasis of the signal after demodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne des circuits de préaccentuation et de désaccentuation de signaux à large bande, en particulier de signaux de luminance, ces circuits assurant une amélioration du rapport signal à bruit dans une chaîne de transfert de signal à large bande. Le circuit de préaccentuation comprend des parties sensibles en fréquence et en amplitude séparées ainsi qu'une partie à gain linéaire, ce qui procure un gain fixe jusqu'à une fréquence inférieure déterminée, une réponse fixe entre cette fréquence et une fréquence de coupure supérieure variable, et un gain fonction de l'amplitude au-delà de cette fréquence de coupure. La désaccentuation est réalisée par un circuit comprenant également des parties sensib ;es en fréquence et en amplitude séparées et une partie à gain linéaire, et qui peut être facilement accordé au circuit de préaccentuation. Application aux magnétoscopes.
FR7739270A 1976-12-27 1977-12-27 Chaine de transfert pour signaux a large bande, en particulier systeme d'enregistrement/lecture de signaux video Withdrawn FR2375762A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/754,757 US4200889A (en) 1976-12-27 1976-12-27 Complementary pre-emphasis and de-emphasis circuits for a video signal transfer channel

Publications (1)

Publication Number Publication Date
FR2375762A1 true FR2375762A1 (fr) 1978-07-21

Family

ID=25036198

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7739270A Withdrawn FR2375762A1 (fr) 1976-12-27 1977-12-27 Chaine de transfert pour signaux a large bande, en particulier systeme d'enregistrement/lecture de signaux video

Country Status (4)

Country Link
US (1) US4200889A (fr)
DE (1) DE2757027A1 (fr)
FR (1) FR2375762A1 (fr)
GB (1) GB1598316A (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54145111A (en) * 1978-05-02 1979-11-13 Sony Corp Video signal recorder-reproducer
JPS55117712A (en) * 1979-02-28 1980-09-10 Matsushita Electric Ind Co Ltd Noise reduction circuit of video signal recording and reproducing device
DE2950764A1 (de) * 1979-12-17 1981-07-23 Basf Ag, 6700 Ludwigshafen Anordnung zur entzerrung eines breitbandsignals, insbesondere eines videosignals mit oder ohne farbinformation in einem signal-aufzeichnungs/wiedergabe-system
JPS56152337A (en) * 1980-04-24 1981-11-25 Victor Co Of Japan Ltd Noise reduction system
JPS5717241A (en) * 1980-07-04 1982-01-28 Hitachi Ltd Dynamic emphasis circuit
US4510536A (en) * 1982-07-16 1985-04-09 Discovision Associates Signal conditioning method and apparatus for FM code signal
US4536846A (en) * 1982-09-20 1985-08-20 Rca Corporation Distortion reducer for companded analog systems
US4518994A (en) * 1982-12-20 1985-05-21 Rca Corporation Communication system compandor
JPS59144288A (ja) * 1983-02-07 1984-08-18 Victor Co Of Japan Ltd 映像信号記録再生装置
JPS6030285A (ja) * 1983-07-29 1985-02-15 Victor Co Of Japan Ltd 映像信号記録再生装置
JPS6030295A (ja) * 1983-07-29 1985-02-15 Victor Co Of Japan Ltd 搬送色信号の記録再生装置
JPS6093682A (ja) * 1983-10-25 1985-05-25 Sony Corp デイジタル非線形プリエンフアシス回路
US4561012A (en) * 1983-12-27 1985-12-24 Rca Corporation Pre-emphasis and de-emphasis filters for a composite NTSC format video signal
JPH0650432B2 (ja) * 1986-06-13 1994-06-29 ヤマハ株式会社 楽音信号発生装置
US5179476A (en) * 1987-09-16 1993-01-12 Canon Kabushiki Kaisha Signal processor
GB9027598D0 (en) * 1990-12-20 1991-02-13 Indep Broadcasting Authority Compatible non linear pre-emphasis for composite video signals
KR100188921B1 (ko) * 1994-07-26 1999-06-01 김광호 8밀리 비디오테이프레코더의 간이 하이-밴드 기록변조회로
EP2145330B1 (fr) 2007-04-11 2014-07-16 Red.Com, Inc. Caméra vidéo
US8237830B2 (en) 2007-04-11 2012-08-07 Red.Com, Inc. Video camera
WO2014127153A1 (fr) 2013-02-14 2014-08-21 Red. Com, Inc. Caméra vidéo
JP7313330B2 (ja) 2017-07-05 2023-07-24 レッド．コム，エルエルシー 電子機器でのビデオ画像データ処理

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529244A (en) * 1967-03-13 1970-09-15 Columbia Broadcasting Syst Inc Method and apparatus for frequency sensitive amplitude limiting
US3735290A (en) * 1972-04-18 1973-05-22 Victor Company Of Japan Compressing and/or expanding system comprising fixed and variable frequency characteristic changing circuits
US3972010A (en) * 1968-01-10 1976-07-27 Ray Milton Dolby Compressors, expanders and noise reduction systems

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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
US3117278A (en) * 1960-12-19 1964-01-07 Minnesota Mining & Mfg Noise reducing system
US3193771A (en) * 1961-02-06 1965-07-06 Gen Electronic Lab Inc Frequency modulation signal enhancer
NL293818A (fr) * 1962-06-07
US3641468A (en) * 1970-02-09 1972-02-08 Bell & Howell Co Time-modulating apparatus
US3902131A (en) * 1974-09-06 1975-08-26 Quadracast Systems Tandem audio dynamic range expander
US4000369A (en) * 1974-12-05 1976-12-28 Rockwell International Corporation Analog signal channel equalization with signal-in-noise embodiment
US3970968A (en) * 1975-01-30 1976-07-20 Anaren Microwave, Incorporated Signal modulator apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529244A (en) * 1967-03-13 1970-09-15 Columbia Broadcasting Syst Inc Method and apparatus for frequency sensitive amplitude limiting
US3972010A (en) * 1968-01-10 1976-07-27 Ray Milton Dolby Compressors, expanders and noise reduction systems
US3735290A (en) * 1972-04-18 1973-05-22 Victor Company Of Japan Compressing and/or expanding system comprising fixed and variable frequency characteristic changing circuits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/69 *

Also Published As

Publication number Publication date
DE2757027A1 (de) 1978-06-29
US4200889A (en) 1980-04-29
GB1598316A (en) 1981-09-16

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Legal Events

Date Code Title Description
ST Notification of lapse