Bande passante

En téléphonie, la norme CCITT prévoit une bande passante de 3100Hz comprise entre 300Hz et 3400Hz.

Bande passante idéale: caractère de Nyquist

B ≤ Ds ≤ 2B

Nous pouvons aussi dire que :

(Ds/2) ≤ B ≤ Ds

  • B = Bande passante 3100Hz
    (300Hz -> 3400Hz = 80% de degré de justesse).
  • Ds = 1/Δ
  • Δ = plus petit instant significatif

Contents Haut

L'intervalle de Nyquist est l'intervale entre deux échantillons d'un même signal :

i = 1 / (2 . fmax)

  • i = intervale.
  • fmax = fréquence maximum.
    En téléphonie, nous pouvons donc dire que l'intervale de Nyquist correspond à 1 / (2 . 4 KHz) = 1/8000 Hz = 125 µs

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 14/07/2003, last modified the 26/10/2018
Source of the printed document:

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.