1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Digital to Analogue graphs

  1. May 8, 2017 #1
    1. The problem statement, all variables and given/known data

    The digitial signal is transmitted and then converted to an analogue form by the DAC. Using data from Fig. 12.2, draw on the axes of Fig.12.3, the output level of the transmitted analogue signal for time zero to time 1.2 ms.

    2. Relevant equations

    Four bit digital numbers being ised

    3. The attempt at a solution

    The solution of the graph is attached. I don't understand how they knew the graph will be constant between 0-0.2 and then 0.2-0.4. How did they calculate this? Secondly this graph looks like a digital graph more than an analogue graph?
    I don't understand the conversion at all.

    Thank you for your help.
     

    Attached Files:

  2. jcsd
  3. May 8, 2017 #2

    DrClaude

    User Avatar

    Staff: Mentor

    What is the sampling frequency?

    The output of the microphone is passed through an ADC.
     
  4. May 8, 2017 #3
    It's 5kHz which I understand now so it's measuring it after every 2 ms which is why the intervals as such.

    Yes and then it puts it back into a DAC.
     
  5. May 8, 2017 #4

    DrClaude

    User Avatar

    Staff: Mentor

    And that DAC cannot recover any information that was lost in the A to D conversion.
     
  6. May 8, 2017 #5
    Ah I don't know why I over complicated questions for myself.

    Thank you so much!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted