Generate samples of sinusoid in matlab

Question

I have to generate 100 samples of sinusoid in matlab with frequency 0.2Hz and sampling rate 2Hz. Until now i have pass into matlab the values:

>> t=[0:99];
>> f=0.2;
>> fs=2;

The sin-wave function is this:

$y(t)=A*sin(2pft+φ)$

Does the Amplitude has some connection with the sampling rate? For example Amplitude values start from 0 and with step of 0.2 did i need to take 100 samples? And how i could find φ in order to plot this signal?

http://www.mathworks.com/help/signal/ug/changing-audio-sampling-rate.html look at this — dato datuashvili, May 12 '13 at 14:53
now your task is to determine what should be upper index so that,total number be 100 — dato datuashvili, May 12 '13 at 14:55

dato datuashvili · Accepted Answer · 2013-05-12T15:00:24.913

0

http://en.wikipedia.org/wiki/Sampling_rate Amplitude is generally independent of sampling rate,about phase shift you can omit it now,because actually finding this parameters or method called frequency estimation are many,you can search it on internet

>> f=0.2;
>> fs=2;
>> A=100;%suppose that amplitude is 100
>> q=20;
>> t=0:1/fs:49;
>> x=A*sin(2*pi*f*t+q);
total length is 101,1 more then you want

edited May 12 '13 at 15:00

answered May 12 '13 at 14:41

dato datuashvili

9,194

Thank you, so if the amplitude is independent and i can omit the phase then is it correct if i write to matlab: y(t)= sin(2pft)/fs ? – 20317 May 12 '13 at 14:44
phase you can write yourself,but i think you should divide by fs not outside,but inside,it means that y(t)=sin(2pif/fs+phase shift),ask to stackoverflow and then please give me link of your question ok? – dato datuashvili May 12 '13 at 14:46
if you would like i will ask it to stackoverflow exactly how it should look and post here if any change ok? – dato datuashvili May 12 '13 at 15:07
Thank you very much! Much appreciated! – 20317 May 12 '13 at 15:10
You use this: "t = 0:1/Fs:1-(1/Fs);" to generate: "t=0:1/fs:49;" ? Or because i need 100 samples? I dont understand the formula you use. – 20317 May 12 '13 at 15:13
http://stackoverflow.com/questions/16508782/generate-100-sample-at-given-rate see this,i have asked it and now we get both exact answer – dato datuashvili May 12 '13 at 15:14
yes it is i used .just i have determined upper limit – dato datuashvili May 12 '13 at 15:15
see please answer,it was posted – dato datuashvili May 12 '13 at 15:36
You are correct choosing the right method! Thanks very much for your help. – 20317 May 12 '13 at 15:50
you are welcome good lucks – dato datuashvili May 12 '13 at 15:55

Generate samples of sinusoid in matlab

1 Answers1