Calculadora de Largura de Banda de Função Janela
Determine a largura de banda equivalente de ruído para diferentes funções janela em processamento de sinais.
Minimum 2 (Nyquist), typical 4-8 for practical systems
Minimum Sampling Rate (Nyquist)
40,000 Hz
Minimum Sampling Rate (Nyquist) vs Maximum Signal Frequency
Formula
How to Determine Sampling Rate
The Nyquist theorem states the minimum sampling rate is twice the highest signal frequency.
Formulas
f_sample_min = 2 x f_max
f_sample_practical = Oversampling Ratio x f_max
In practice, engineers oversample (4x to 8x or more) because:
Exemplo Resolvido
Capture audio up to 20 kHz with 2x oversampling.
- 01Minimum (Nyquist): 2 x 20,000 = 40,000 Hz
- 02Practical rate: 2 x 20,000 = 40,000 Hz
- 03Data rate (16-bit): 40,000 x 16 = 640,000 bits/s = 640 kbps
Perguntas Frequentes
Why not just sample as fast as possible?
Higher sampling rates require more storage, bandwidth, and processing power. Choose a rate that balances quality and resources.
What oversampling ratio should I use?
For basic measurement: 2.5-3x. For precision: 4-8x. For sigma-delta converters: 64-256x.
Does higher sampling rate mean better quality?
Only if there is signal content above the current Nyquist frequency. For signals already band-limited, more resolution (bits) helps more than more speed.
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