title: what is the result inside fft bin at different index?
body: <p>For example if I have 10 samples in the FFT in a system sampled at 100 Hz. Then how are the results represented in FFT bin output ?
  The frequency resolution is going to be how many Hz each DFT bin represents. This is, as you have noted, given by fs/N.  In this case :--</p>
  
  <pre><code>resolution = 100/10 = 10 hz
  </code></pre>
  
  <p>Definition of FFT states that frequency range [0,fs] is represented by N point.</p>
  
  <p>But when the result comes :--</p>
  
  <ul>
  <li>X[0] is the constant term (also refereed to as DC bias)</li>
  <li>X[1] is the 10 hz</li>
  <li>X[2] is the 20 hz</li>
  <li>X[3] is the 30 hz</li>
  <li>X[4] is the 40 hz</li>
  <li>X[5] is the 50 hz</li>
  <li>X[6] to X[9] are the complex conjugates of X[4] to X[1] respectively.</li>
  </ul>
  
  <p>so my question is :--<br>
  X[6] is the 60hz signal &amp; its value will be complex conjugate of 40 hz signal .. is it right ?<br>
  Or X[6] does not contains spectral of 60hz but it is only complex conjugate of X[4] ?</p>
  
  <p>Please suggest.</p>