Window Function Bandwidth Calculator
Compare the equivalent noise bandwidth and main lobe width for common window functions used in spectral analysis.
Hz
Rectangular ENBW
46.88 Hz
Hann ENBW70.31 Hz
Hamming ENBW63.75 Hz
Blackman ENBW81.09 Hz
Flat Top ENBW176.72 Hz
Bin Width (no window)46.875 Hz
Rectangular ENBW vs Sampling Rate
Window Function Bandwidth
Window functions reduce spectral leakage but widen the effective frequency resolution.
Equivalent Noise Bandwidth (ENBW)
ENBW = Bin Width x ENBW Factor
ENBW factors for common windows:
The choice of window balances frequency resolution against spectral leakage. No window is universally best.
Example Calculation
1024-point FFT at 48 kHz comparing window functions.
- 01Bin width: 48,000 / 1,024 = 46.875 Hz
- 02Rectangular ENBW: 46.875 x 1.0 = 46.88 Hz
- 03Hann ENBW: 46.875 x 1.5 = 70.31 Hz
- 04Blackman ENBW: 46.875 x 1.73 = 81.09 Hz
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