## modulating the meesage signal

### yofiandi yosmansyah (view profile)

on 10 Jan 2013

hi guys i have a question which is how to write the matlab code for a messages signal

```m(t) =
1 when 0=<t=<0.05
-9 when 0.05=<t=<0.1
else is 0
```

pls help me and thanks

yofiandi yosmansyah

### yofiandi yosmansyah (view profile)

on 11 Jan 2013

oke..im sorry i was very sleep so i didnt see it clearly.. well the m(t) became 2 from t= 0 until t=0.05 and become -9from t=0.05 onward. but when t<0 and t>0.1 its supposed have a zero value. so how to make that m(t) yah? m(t) = { 1 when 0=<t=<0.05 -9 when 0.05=<t=<0.1 0 when t= elsewhere }

yofiandi yosmansyah

### yofiandi yosmansyah (view profile)

on 11 Jan 2013

thats it is..thanks bro for the help..i really appreciate it..btw how to plot the amplitude spectra ya??

Walter Roberson

### Walter Roberson (view profile)

on 11 Jan 2013

stairs() to plot.

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### Walter Roberson (view profile)

on 11 Jan 2013

Define your vector t of times. Then,

```m = zeros(size(t));
m(t > 0 & t < 0.05) = 1;
m(t >= 0.05 & t <= 0.01) = -9;
```

Note this would be only one pulse.

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