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How to obtain the sampling frequency of frequency data

  1. May 20, 2012 #1
    Hi everybody, this is my first question in this forums.

    I have some complex data in Matlab the absolute value of which represent a frequency response. My data extend from 1 Hz to 20 kHz and have an incremental frequency of 1 Hz.

    I now need to convert this frequency responses in Impulse responses in order to measure the duration of this Impulse response. I am a bit confused though on what is the sampling frequency of my data. I need this information I guess in order to calculate time.

    Is it the highest frequency of my dataset (that is 20 kHz) or double this frequency (40 kHz).

  2. jcsd
  3. May 23, 2012 #2


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    Science Advisor
    Gold Member

    Assuming I have understood you correctly, you essentially have a Fourier transform of a signal as this data set you are talking about? Your sampling frequency will be double the maximum resolved frequency. It is the concept of the Nyquist frequency.
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