How to extend x range of pwelch

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Anthony Koning 2023-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/1954019-how-to-extend-x-range-of-pwelch

评论： Star Strider 2023-4-27

Hi, I'm wondering how to extend the pwelch x range of a function. by default, if you were to plot pwelch(X), the default range is from 0-1. Is there any way to change this range to calculate the normalized frequency from, say, 0-10? Thanks.

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Answer 1

Torsten 2023-4-27

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移动：Torsten 2023-4-27

Multiply the result from pwelch by 10. :-)

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Anthony Koning 2023-4-27

编辑：Anthony Koning 2023-4-27

No, I'm looking to rescale the x range of the pwelch function. Essentially, I have a signal that is using a pwelch command to identify the power density spectrum. The default value for the x-axis, normalized frequency (or Hz) goes from 0-1. I would like to know how to extend the range of this to show the Hz from 0-10, without changing the spectrum's power values (yaxis). Ysing this picture as an example, I'd like the x range to be multiplied by 10, without changing the y range. This is obvious a crude example, and the graphs liekly wouldn't look identical with only a different x scale, but I hope this helps clarify what I'm looking for.

Star Strider 2023-4-27

The frequency axis goes from DC (0 Hz) to π radians or the Nyquist frequency (half the sampling frequency) if that information is provided. The only way to change the frequency axis would be to resample the signal to a higher sampling frequency, in this instance, 10 times the original sampling frequency.

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