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Gilles
Gilles
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I have a couple of questions regarding windowed FFTs:

  1. Why is the noise floor higher with windowed FFTs (according to Wikipedia's spectral leakage page, anyway), when the whole point of windowing is to reduce side lobes?

  2. I realize that different windows are better for different things, but is there a window that is considered to be the best all-around window for spectrum analysis? Alternatively, is there a better way to do spectrum analysis than windowed FFTs? It would have to be a DSP approach (i.e. I can't do an array of analog filters), but within that constraint I am game for different solutions.

Thanks for your time in reading this.

I have a couple of questions regarding windowed FFTs:

  1. Why is the noise floor higher with windowed FFTs (according to Wikipedia's spectral leakage page, anyway), when the whole point of windowing is to reduce side lobes?

  2. I realize that different windows are better for different things, but is there a window that is considered to be the best all-around window for spectrum analysis? Alternatively, is there a better way to do spectrum analysis than windowed FFTs? It would have to be a DSP approach (i.e. I can't do an array of analog filters), but within that constraint I am game for different solutions.

Thanks for your time in reading this.

I have a couple of questions regarding windowed FFTs:

  1. Why is the noise floor higher with windowed FFTs (according to Wikipedia's spectral leakage page, anyway), when the whole point of windowing is to reduce side lobes?

  2. I realize that different windows are better for different things, but is there a window that is considered to be the best all-around window for spectrum analysis? Alternatively, is there a better way to do spectrum analysis than windowed FFTs? It would have to be a DSP approach (i.e. I can't do an array of analog filters), but within that constraint I am game for different solutions.

Thanks for your time in reading this.

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Jim Clay
Jim Clay
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Spectrum Analysis using Windowed FFTs

I have a couple of questions regarding windowed FFTs:

  1. Why is the noise floor higher with windowed FFTs (according to Wikipedia's spectral leakage page, anyway), when the whole point of windowing is to reduce side lobes?

  2. I realize that different windows are better for different things, but is there a window that is considered to be the best all-around window for spectrum analysis? Alternatively, is there a better way to do spectrum analysis than windowed FFTs? It would have to be a DSP approach (i.e. I can't do an array of analog filters), but within that constraint I am game for different solutions.

Thanks for your time in reading this.