FR2408965A1 - CIRCUIT INTENDED TO REMOVE PARASITE SIGNALS CAUSED BY SCRATCHES IN AN ELECTROPHONE DISC - Google Patents

CIRCUIT INTENDED TO REMOVE PARASITE SIGNALS CAUSED BY SCRATCHES IN AN ELECTROPHONE DISC

Info

Publication number
FR2408965A1
FR2408965A1 FR7831985A FR7831985A FR2408965A1 FR 2408965 A1 FR2408965 A1 FR 2408965A1 FR 7831985 A FR7831985 A FR 7831985A FR 7831985 A FR7831985 A FR 7831985A FR 2408965 A1 FR2408965 A1 FR 2408965A1
Authority
FR
France
Prior art keywords
disc
signal
electrophone
scratches
parasite
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Withdrawn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
FR7831985A
Other languages
French (fr)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2408965A1 publication Critical patent/FR2408965A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Confectionery (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

CE CIRCUIT POUR SUPPRIMER DES SIGNAUX PARASITES A AUDIOFREQUENCE DANS UN SIGNAL PROVENANT D'UN DISQUE COMPORTE D'UNE PART UNE PARTIE DE TRAITEMENT DE SIGNAL BRANCHEE ENTRE UNE ENTREE ET UNE SORTIE ET MUNIE D'UNE UNITE DE RETARDEMENT AINSI QUE D'UN DISPOSITIF DE DEPARASITAGE COUPLE A CETTE UNITE, ET D'AUTRE PART UNE PARTIE DE SIGNAL DE REGLAGE RACCORDEE A L'ENTREE ET MUNIE D'UN DETECTEUR DE SIGNAL PARASITE. DANS LEDIT DISPOSITIF DE DEPARASITAGE, DES L'APPARITION D'UN SIGNAL PARASITE, L'AMPLITUDE DU SIGNAL SONORE PROVENANT DU DISQUE EST DIMINUEE PENDANT UNE COURTE DUREE CONSTANTE. APPLICATION AUX TOURNE-DISQUES.THIS CIRCUIT FOR REMOVING AUDIO-FREQUENCY PARASITE SIGNALS IN A SIGNAL COMING FROM A DISC INCLUDES ON THE ONE HAND A SIGNAL PROCESSING PART CONNECTED BETWEEN AN INPUT AND AN OUTPUT AND EQUIPPED WITH A DELAY UNIT AS WELL AS A CONTROL DEVICE. COUPLED DETERIORATION TO THIS UNIT, AND ON THE OTHER HAND AN ADJUSTMENT SIGNAL PART CONNECTED TO THE INPUT AND EQUIPPED WITH A PARASITE SIGNAL DETECTOR. IN THIS DETERGENT DEVICE, AS SOON AS A PARASITE SIGNAL APPEARS, THE AMPLITUDE OF THE SOUND SIGNAL FROM THE DISC IS REDUCED FOR A CONSTANT SHORT TERM. APPLICATION TO RECORD PLAYERS.

FR7831985A 1977-11-15 1978-11-13 CIRCUIT INTENDED TO REMOVE PARASITE SIGNALS CAUSED BY SCRATCHES IN AN ELECTROPHONE DISC Withdrawn FR2408965A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7712534A NL7712534A (en) 1977-11-15 1977-11-15 CIRCUIT FOR SUPPRESSING FAULTS DUE TO SCRATCHES IN A GRAMOPHONE DISC.

Publications (1)

Publication Number Publication Date
FR2408965A1 true FR2408965A1 (en) 1979-06-08

Family

ID=19829537

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7831985A Withdrawn FR2408965A1 (en) 1977-11-15 1978-11-13 CIRCUIT INTENDED TO REMOVE PARASITE SIGNALS CAUSED BY SCRATCHES IN AN ELECTROPHONE DISC

Country Status (15)

Country Link
JP (1) JPS5479002A (en)
AR (1) AR216346A1 (en)
AT (1) AT357780B (en)
BE (1) BE871969A (en)
BR (1) BR7807453A (en)
CA (1) CA1110548A (en)
DE (1) DE2849375A1 (en)
ES (1) ES475021A1 (en)
FR (1) FR2408965A1 (en)
GB (1) GB2007945B (en)
HK (1) HK33882A (en)
IT (1) IT1101046B (en)
MX (1) MX147638A (en)
NL (1) NL7712534A (en)
SE (1) SE7811667L (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE430455B (en) * 1978-04-21 1983-11-14 Nippon Telegraph & Telephone RECEIVER DEVICE WITH THE FUNCTION TO COMPRESS NOISE DURING Sudden Interruptions
DE3016779C2 (en) * 1980-04-30 1986-09-18 Siemens AG, 1000 Berlin und 8000 München Click protection for digital audio program transmission
DE3212615C2 (en) * 1982-04-05 1984-09-06 Bayerische Motoren Werke AG, 8000 München Method for switching the reproduction of a broadcast signal to another broadcast signal and circuit arrangement for carrying out the method
NL8402322A (en) * 1984-07-23 1986-02-17 Philips Nv DEVICE FOR DETECTING IMPULSE INTERFERENCES, AND A DEVICE FOR SUPPRESSING IMPULSE INTERFERENCES, INCLUDING DEVICE FOR DETECTING IMPULSE INTERFERENCES.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS LETTERS, volume 12, no. 25, 9 décembre 1976, LONDRES (GB); M. SACH et al.: "Audio-Disc Scratch Filter", pages 656-657 *

Also Published As

Publication number Publication date
IT1101046B (en) 1985-09-28
BR7807453A (en) 1979-07-17
JPS5479002A (en) 1979-06-23
AT357780B (en) 1980-07-25
GB2007945A (en) 1979-05-23
ES475021A1 (en) 1979-04-16
DE2849375A1 (en) 1979-05-17
SE7811667L (en) 1979-05-16
HK33882A (en) 1982-07-30
NL7712534A (en) 1979-05-17
AR216346A1 (en) 1979-12-14
CA1110548A (en) 1981-10-13
ATA811878A (en) 1979-12-15
MX147638A (en) 1982-12-24
GB2007945B (en) 1982-05-06
IT7829694A0 (en) 1978-11-10
BE871969A (en) 1979-05-14

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Legal Events

Date Code Title Description
ST Notification of lapse