how do audio high pass and low pass filters work? (what’s the science behind it?)
In: 5
The science behind analog high/low pass filters is inductance and capacitance. Inductivity is resistance to changes in the direction in the flow of current. High frequencies change direction very frequently, so a highly inductive circuit will resist them, making it more difficult for them to flow through. Capacitance works the opposite way. You can adjust a circuit’s inductance and capacitance values to determine which frequencies are affected by it and how.
Digital filtering is another story. There you throw math at the signal. You put it through an algorithm called fourier transform, which does some calculations on the signal and breaks it down into its frequency components. You then remove the frequencies you don’t want, and turn the remaining collection of frequencies back into a signal.
Latest Answers