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FFT Amplitudes raise with used FFT Points

 
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holosound



Joined: 03 Jul 2003
Posts: 1

PostPosted: Thu Jul 03, 2003 4:23 pm    Post subject: FFT Amplitudes raise with used FFT Points Reply with quote

If I analyse a 440 Hz Sine Waveform with -3dB - Amplitude, I get with Wavesurfer 1.52
the correct Amplitude with 512 Point FFT.
Doubling the FFT Points raise the Spectrum Amplitude by a value of 6 dB.
Dividing the FFT Points by 2 lower the Specture Amplitude by a value of -6dB.
I think, a change of the FFT points should only change the freqeuncy resolution of
the FFT NOT the amplitude values.
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