Calculadora de Faixa Dinâmica
Determine a faixa dinâmica de sistemas de áudio e eletrônicos em decibéis.
Rectangular ENBW
46.88 Hz
Rectangular ENBW vs Sampling Rate
Formula
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.
Exemplo Resolvido
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
Perguntas Frequentes
Which window should I use?
Hann is a good general-purpose choice. Use rectangular for transients, flat-top for amplitude accuracy, and Blackman for maximum sidelobe rejection.
What is ENBW?
Equivalent Noise Bandwidth is the width of an ideal rectangular filter that would pass the same noise power as the window.
Does the window affect measurement accuracy?
Yes. Wider ENBW means more noise in each bin. Flat-top windows have wide ENBW but give the most accurate amplitude readings.
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