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From: Martin on 8 May 2010 16:29
Hi everyone

I need a help with 'spectrogram' function. It makes FFT of my signal and plots it with time and frequency on the axis and the magnitude of frequency showed with color.
The frequency range of FFT algorithm depends on the sampling frequency.
In my case the sampling frequency is very high (160 kHz), but as the result I focus just on the range 0-60 Hz. Can I modify spectrogram to compute the fft only up to 60 Hz?
I can change the range in Axes properties but in this way I loose the information of magnitude (displayed with color) because I just cut a very small piece from wide frequency range

Thank you for your help and tips.

Martin Bruha
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