Low Pass Filter Component Calculator
Low pass filters (LPFs) are crucial in signal processing, and this calculator helps you design them. Learn why it matters and how to use this tool.
- Enter the cutoff frequency (fc) and sample rate (fs).
- Choose the filter order.
- Click ‘Calculate’.
The calculator uses the Butterworth filter design method. The transfer function is calculated as:
H(s) = (1 / (s^order + a1*s^(order-1) + … + a_order)) * (b_order + b_(order-1)*s + … + b_1*s^order)
Case Study 1
fc = 100 Hz, fs = 1000 Hz, order = 2
Case Study 2
fc = 500 Hz, fs = 44.1 kHz, order = 3
Case Study 3
fc = 2000 Hz, fs = 48 kHz, order = 4
| Order | fc (Hz) | fs (Hz) | Result |
|---|---|---|---|
| 1 | 100 | 1000 | 0.100 |
| 2 | 500 | 44.1k | 0.01157 |
| 3 | 2000 | 48k | 0.00417 |
- Higher order filters provide better attenuation but have a longer transition band.
- Choose the order based on your specific application’s requirements.
Q: What is the difference between a low pass and a high pass filter?
A: A low pass filter allows low frequencies to pass and attenuates high frequencies, while a high pass filter does the opposite.
Q: What is the cutoff frequency?
A: The cutoff frequency is the frequency at which the filter’s gain is 3 dB below the passband.