# Obtaining Sine Wave From Square Wave

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tinkyminky93 el 28 de Sept. de 2022
Comentada: tinkyminky93 el 29 de Sept. de 2022
Hello,
I have a square wave but this wave is not an ideal square wave. What I mean is, for example from the first sample of positive peak to the last sample of the positive peak, I have 100 datas. In the next positive peak, I have 91 datas. I want to plot a sine wave which changes adaptively by the number of samples in the positive and negative peaks. This sine wave's positive period should end when the square waves positive peak drops to the zero. Or the best continuous wave that fits with this square wave. Thanks for your advices.
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tinkyminky93 el 28 de Sept. de 2022
No i do not need a pure sine wave, enough is enough. It can be like linear interpolation.
Image Analyst el 28 de Sept. de 2022
"I have a square wave" <== but you forgot to attach it. Please attach it as a .mat or .txt file with the paperclip icon.

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Chunru el 28 de Sept. de 2022
% generate a square wave with no fixed period
f = 0.125; fs=1;
s = 0.3+sin(2*pi*f*(0:40)); % a sine wave with offset
x =2* (s>0) -1; % square wave
stem(x);
y = lowpass(x, f*1.5, fs);
hold on
plot(y)
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Walter Roberson el 29 de Sept. de 2022
The offset biases there to be more positive values than negative values.
However the end result has fixed frequency, f: the 0:40 are acting as time.
tinkyminky93 el 29 de Sept. de 2022
Simply low pass filtering my square wave gives me a sine wave. Seems like I do not need a solution like that.

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