How to determine ALPHA, smoothing constant, of a LPF?

1. What is alpha in low pass filter?
2. How do you calculate LPF?
3. How do you choose a low pass filter cutoff frequency?
4. What is the impulse response of ideal low pass filter?

What is alpha in low pass filter?

α is the smoothing factor, theoretically between 0.0 and 1.0. In practice typically <0.2 and often <0.1 or smaller, because above that you're barely doing any filtering (or sampling verrrry slowly).

How do you calculate LPF?

This passive RC low pass filter calculator calculates the cutoff frequency point of the low pass filter, based on the values of the resistor, R, and the capacitor, C, of the circuit, according to the formula fc= 1/(2πRC).

How do you choose a low pass filter cutoff frequency?

The cutoff frequency for a low-pass filter is that frequency at which the output (load) voltage equals 70.7% of the input (source) voltage. Above the cutoff frequency, the output voltage is lower than 70.7% of the input, and vice versa.

What is the impulse response of ideal low pass filter?

Thus, the impulse response of an ideal lowpass filter is a sinc function.