FR2435879A1 - Appareils de reglage automatique du volume sonore en fonction des variations du niveau du bruit ambiant - Google Patents

Appareils de reglage automatique du volume sonore en fonction des variations du niveau du bruit ambiant

Info

Publication number
FR2435879A1
FR2435879A1 FR7921366A FR7921366A FR2435879A1 FR 2435879 A1 FR2435879 A1 FR 2435879A1 FR 7921366 A FR7921366 A FR 7921366A FR 7921366 A FR7921366 A FR 7921366A FR 2435879 A1 FR2435879 A1 FR 2435879A1
Authority
FR
France
Prior art keywords
level
circuit
sound
sound volume
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.)
Pending
Application number
FR7921366A
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.)
Viva Co Ltd
Original Assignee
Viva Co Ltd
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
Priority claimed from JP53103385A external-priority patent/JPS5841003B2/ja
Priority claimed from JP14494378A external-priority patent/JPS5571307A/ja
Priority claimed from JP15623978A external-priority patent/JPS5841004B2/ja
Application filed by Viva Co Ltd filed Critical Viva Co Ltd
Publication of FR2435879A1 publication Critical patent/FR2435879A1/fr
Pending 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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)

Abstract

Cet appareil comprend un circuit 3 de réglage du volume sonore monté entre une source 1 de signal sonore et un haut-parleur 5. Un premier circuit redresseur 11 crée un premier signal dont le niveau correspond au niveau d'un signal sonore fourni au haut-parleur. Un microphone 6 et un deuxième circuit redresseur 9 créent un deuxième signal correspondant au niveau d'un son complexe constitué du son provenant du haut-parleur 5 et du bruit ambiant. Un circuit soustracteur 20 crée un troisième signal dont le niveau correspond à la différence des deux premiers signaux, c'est-à-dire au niveau du bruit ambiant. Un circuit porte 29 échantillonne le troisième signal à intervalles prédéterminés et un circuit intégrateur 35 retient la sortie du circuit porte pendant un temps prédéterminé. La sortie du circuit intégrateur commande le dispositif de réglage du volume sonore. Applications : notamment au réglage du volume sonore provenant d'appareil de télévision, de radios ou de magnétophones.
FR7921366A 1978-08-26 1979-08-24 Appareils de reglage automatique du volume sonore en fonction des variations du niveau du bruit ambiant Pending FR2435879A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP53103385A JPS5841003B2 (ja) 1978-08-26 1978-08-26 自動音量調整装置
JP14494378A JPS5571307A (en) 1978-11-25 1978-11-25 Automatic sound volume adjustment unit
JP15623978A JPS5841004B2 (ja) 1978-12-20 1978-12-20 自動音量調整装置

Publications (1)

Publication Number Publication Date
FR2435879A1 true FR2435879A1 (fr) 1980-04-04

Family

ID=27309980

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7921366A Pending FR2435879A1 (fr) 1978-08-26 1979-08-24 Appareils de reglage automatique du volume sonore en fonction des variations du niveau du bruit ambiant

Country Status (5)

Country Link
US (1) US4254303A (fr)
DE (1) DE2934593A1 (fr)
FR (1) FR2435879A1 (fr)
GB (1) GB2029141A (fr)
SE (1) SE7907070L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513839A1 (fr) * 1981-09-28 1983-04-01 Carpentier Claude Perfectionnement aux dispositifs permettant l'ajustement du niveau des sources sonores utiles dans les milieux a bruyance variable

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513839A1 (fr) * 1981-09-28 1983-04-01 Carpentier Claude Perfectionnement aux dispositifs permettant l'ajustement du niveau des sources sonores utiles dans les milieux a bruyance variable

Also Published As

Publication number Publication date
US4254303A (en) 1981-03-03
SE7907070L (sv) 1980-02-27
GB2029141A (en) 1980-03-12
DE2934593A1 (de) 1980-02-28

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