transmission2.py

Created by famille-bvc

Created on October 23, 2023

852 Bytes


** Notation des signaux **
  
Porteuse : 
up(t)= Up(max) cos(2piFt)

Modulant :
Us(t) + U0

Modulé :
Um(t)= k(U0 + Us(t))p(max)cos(2piFt)

** Formules **
  
Taux de modulation :
    Um(max)-Um(min)
m = ---------------
    Um(max)+Um(min)

ou

m = Us(max)/U0

Frequences du spectre :
  
^        ^
|        |
|    ^   |   ^
|    |   |   |
|    |   |   |
------------------->
     f1  f2  f3
     
f1 = fp - fe
f2 = fp
f3 = fp + fe

  *** Exos ***
  
genre de modulation :
  Avec porteuse si f2 present

allure du signal modulant :
  Sinus car un seul pique

freq modulant : 
= fe (ecart entre les raies et P)
ou 1/2 Ee Ep

indice de modulation :
  Amplitude raie/porteuse
ou
(1/4 m E0 Ep)/(1/2 Eo Ep) = m/2

bande passante:
  f3 - f1 ou 2*fe
  
Si on veut ecouter ... sur 183kHz
on regle fp tels que 
183 + fp = fc (en general 455)

During your visit to our site, NumWorks needs to install "cookies" or use other technologies to collect data about you in order to:

With the exception of Cookies essential to the operation of the site, NumWorks leaves you the choice: you can accept Cookies for audience measurement by clicking on the "Accept and continue" button, or refuse these Cookies by clicking on the "Continue without accepting" button or by continuing your browsing. You can update your choice at any time by clicking on the link "Manage my cookies" at the bottom of the page. For more information, please consult our cookies policy.