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EP0305301A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Signal compressor circuit, in particular for telephone set

Assignee: STMicroelectronics SA
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Filing: 1988-07-20
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Granted: —
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Expires: 2008-07-20
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Abstract

Abstract Translated from French La présente invention concerne un circuit compresseur de signal, en particulier pour appareil téléphonique du type "mains libres", comprenant un préamplificateur (10) dont l'entrée est reliée à un signal d'entrée à traiter, et un dispositif de contrôle de gain du préamplificateur (11) pour asservir, à une valeur prédéterminée, l'amplitude du signal de sortie du préamplificateur, dans lequel le dispositif de contrôle de gain (11) est associé à un circuit (C, 15, 16) définissant deux constantes de temps, qui commandent respectivement la vitesse d'augmentation ou de diminution du gain du préamplificateur (10) en fonction de l'amplitude du signal d'entrée (Vin). The present invention relates to a signal compressor circuit, in particular for a hands-free telephone apparatus, comprising a preamplifier (10) whose input is connected to an input signal to be processed, and a gain control device of the preamplifier (11) to control, to a predetermined value, the amplitude of the output signal of the preamplifier, in which the gain control device (11) is associated with a circuit (C, 15, 16) defining two constants of times, which respectively control the speed of increase or decrease of the gain of the preamplifier (10) as a function of the amplitude of the input signal (Vin).

Inventors

  • 👤 Bruno Defretin
  • 👤 Thierry Arnaud

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 09:18
CPC Classifications
H; H04; H04M; H04M1/00; H04B; H04B1/00; H04B1/62; H04B1/64; H03; H03G; H03G7/00; H03G7/002; H04M1/60; H04M1/6033

Claims Analysis

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References Cited (Backward Citations)

US3602648A Cited
US3919654A Cited
GB2025719A Cited
EP0187696A2 Cited

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