Obtaining Sine Wave From Square Wave

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tinkyminky93
tinkyminky93 2022-9-28
评论： tinkyminky93 2022-9-29
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
tinkyminky93 2022-9-28
No i do not need a pure sine wave, enough is enough. It can be like linear interpolation.
Image Analyst
Image Analyst 2022-9-28
"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
Chunru 2022-9-28
Ran in:
% 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
Walter Roberson 2022-9-29
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
tinkyminky93 2022-9-29
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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