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FR2514213A1

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Publication
_________________________________________________________________
Number FR2514213A1
Family ID 8024076
Probable Assignee Carpentier Claude
Publication Year 1983
Title
_________________________________________________________________
FR Title AMPLIFICATEUR AUDIO-FREQUENCE AVEC EGALISATION PREREGLEE
EN Title AF AMPLIFIER WITH PRE-ADJUSTED EQUALISATION FOR MOTOR VEHICLE
- HAS RETRACTABLE PANEL WITH REPLACEABLE INTEGRATED CIRCUIT CONTAINING
PASSIVE ELEMENTS TO MODIFY FREQUENCY RESPONSE
Abstract
_________________________________________________________________
AMPLIFICATEUR AUDIO-FREQUENCE DU TYPE COMPORTANT UN DISPOSITIF
D'EGALISATION PARAMETRIQUE CARACTERISE PAR LE FAIT QUE LA MODIFICATION
DE LA COURBE DE REPONSE EST OBTENUE PAR VARIATION DE LA VALEUR DE
RESISTANCES D'UN RESEAU PLACE SUR UN MODULE ESCAMOTABLE.
L'INVENTION S'APPLIQUE PRINCIPALEMENT AUX AMPLIFICATEURS POUR
AUTOMOBILES.
An AF amplifier for a motor vehicle installation has a retractable
panel which plugs in and is interchangeable. The panel contains an
integrated circuit containing passive elements such as a known network
of resistances in order to provide elements for parametric correction
of frequency response. Low production cost eliminates measurement for
adjustable controls. Adjustment is performed by changing the
integrated circuit to another with a different frequency response
characteristic. This allows the loudspeaker response to be more
suitably matched to a particular vehicle.
Description
_________________________________________________________________
t'ecoute des sources sonores utiles dans des locaux de failles
dimensions: pieces d'appartement ou vehicules automobiles pose des
problemes de distorsion de la linearite en frequence des chaines
transductrices.
La cause de cette distorsion est le mauvais couplage entre le haut
parleur et le local. Ce phenomene est mal maitrise par les fabricants
de haut- parleurs et pas du tout par les installateurs.
Le principe des egaliseurs graphiques a parametres fixes est
insuffisant a resoudre le probleme car les parametres ne correspondent
aux besoins que par hasard.
Les ERaliseurs de type parametrique sont une solution au probleme mais
ils necessitent 3 potentiometres doubles par cellule et il est
necessaire de prevoir 4 cellules pour traiter convenablement
l'ensemble du spectre.
Cette solution ne peut etre appele a une grande diffusion car le
nombre de potentiometres rend cette solution chere et encombrante et
on ne peut demander a tous les installateurs de s'equiper des
appareils de mesure necessaires et de maitriser la technique de
l'egalisation parametrique.
Le marche de l'automobile est assez important pour mettre en oeuvre
des amplificateurs munis de corrections fixes adaptees aux vehicules
et aux hauts parleurs choisis.Ainsi est-il possible et peu onereux de
livrer des voitures munies d'une chaine transductrice linearisee en
frequence
Mais il existe a cette demarche un obstacle commercial important du a
l'aspect passionnel du marche de ltelectro-acoustique.. Cette formule
qui fige le choix du client en matiere de haut-parleurs ne peut
qu'aboutir a un echec commercial.
L'invention est un amplificateur audio-frequences principalement
destine a l'automobile et permettant de maniere simple et peu onereuse
d'ob- tenir une modification de la linearite en frequence afin de
s'adapter a tous les cas de changement de vehicule ou de
haut-parleurs.
L'idee de l'invention est de reunir sur une plaquette escamotable et
interehangeable les elements passifs du circuit d'un correcteur
parametrique qui interviennent dans le reglage des parametres afin de
pouvoir obtenir par modification de la valeur de ces elements, des
reglages differents. Les elements passifs choisis seront de preference
des resistances, et ainsi avec environ 10 resistances montees sur un
support a broche on parvient a traiter une cellule parametrique.
Le prix de revient industriel de cette plaquette etant de l'ordre du
franc cette solution coute moins cher et est plus precise qu'un
reglage
Manuel. Plusieurs cellules peuvent etre traitees sur a meme plaquette
qui peut industriellement prendre la forme d'un cicuit integre formant
un reseau de resistances de type connu actuellement. Cette formule est
compatible avec les autres technologies de type hybride ou non.
Si l'on se contente d'une courbe de reponse a 3 dB pres ce qui semble
suffisant une centaine de modulesdifferents doivent permettre de
traiter tous les cas de figure. Ce qui permet compte tenu de leur
faible cout d'envisager leur prise en stock par l'ensemble des
revendeurs.
Claims
_________________________________________________________________
1. REVENDICATION 1") Amplificateur audio frequence du type comportant
un dispositif d'egalisation de type parametrique caracterise par le
fait que les potentiometres de reglage sont remplaces par des
resistances reunies sur des modules escamotables et interchangeables
se differenciant entre eux par la valeur des resistances de maniere a
obtenir pour chaque module une courbe de reponse predeterminee
enfonction du local et des hauts parleurs choisis.
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