In contrast to the time-domain representation, in which one moment in time corresponds to only one voltage value, a frequency-domain representation (also called a spectrum) conveys information about a signal by identifying the various frequency components that are simultaneously present. What you see on the oscilloscope is the time-domain representation of the signal.Ī typical oscilloscope trace is straightforward and intuitive, but it is also somewhat restrictive, because it does not directly reveal the frequency content of a signal. At any specific moment in time, the signal has only one voltage value. When you look at an electrical signal on an oscilloscope, you see a line that represents changes in voltage with respect to time. This article introduces the concept of filtering and explains in detail the purpose and characteristics of resistor-capacitor (RC) low-pass filters. What is filtering? Learn what resistor-capacitor (RC) low-pass filters are and where you can use them.
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