Day 2

Day 2 - Alien aliasing

Today we learned a lot about the sampling and signal rate and its correlating effects like aliasing.
Especially aliasing was breaking my head but i quite got it. We also started to quantitise signals with matlab and computed some RMS-values where some integration was needed. At the end of the day we played some tunes with matlab and looked forward to use some sound processing functions.

Done:

• Sampling a continous signal and plot it

 

• Quantisation of a analogue signal (sine wave)

• Computed RMS values and error-computation

• Played a few tunes and studied typical sound-functions in matlab

• Excercise 2 in team work link  

• Hours worked: (6h) + 7h = 13h

Learned:

• Learned the connection between sample rate and signal rate

• Get used to aliasing and its effects (mirror signals)

• Learned to plot in logarithmic scales

• Integrated with Matlab

 

• How to manage quantisation in matlab

• Playing tunes with matlab

        t=linspace(0,4,40000);

        y=sin(440*2*pi*t);

        sound(y,10000);

To Do next:

• Solve questions 11 and 12 in sound processing

• Create/read wav. files with matlab

• Analyse sound

• Maybe filtering sounds?

• Understand aliasing 100%