Blackman/Hamming Window

2021 1 14
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更新时间：2021 1 15
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How can I change the amplitude of a hamming/blackman window and on ox axis and have time on ox axis(in seconds)?

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Mathieu NOE
Mathieu NOE 2021-1-14
hello !
sorry , your question is not clear - windows are defined by their lenght in samples
like hanning(10) is a 10 samples lenght hanning window , whatever the sampling (time interval)
Joanna Mark
Joanna Mark 2021-1-14
I understood. And is there a possibility to set a certain amplitude?(less than 1)
Mathieu NOE
Mathieu NOE 2021-1-15
all windows are normalised so the central value is always 1 (demo for odd number of samples below )
you can always multiply the output of the window function by any factor if you need to , like out = 10*hanning(5)
>> hanning(5)
0.2500
0.7500
1.0000
0.7500
0.2500
>> hamming(5)
0.0800
0.5400
1.0000
0.5400
0.0800
>> blackman(5)
0
0.3400
1.0000
0.3400
0
Joanna Mark
Joanna Mark 2021-1-15
Thank you very much for your help!
Joanna Mark
Joanna Mark 2021-1-15
and one more question: i want to add a line after this window. The code is
R=11;
window=0.4*hamming(R);
X = [11.1,11.4];
Y = [0,0];
total=[window X Y];
But it can't run, because of an error using horzcat
Bjorn Gustavsson
Bjorn Gustavsson 2021-1-15
Whenever you get errors like that always start investigating the cause by checking the sizes of your arrays. Here that would be done most easily with whos:
whos window X Y
That way you can check that you're concatenating arrays of matching sizes.

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