Filtering with math channels PicoScope's math channels can be used to apply a sliding-window filter to your signals. All four basic shapes of filter are available: Highpass – rejects low-frequency hum and DC offsets Lowpass – removes high-frequency noise Bandpass – extracts a band-limited signal (such as a radio channel) from background noise Bandstop – (also called notch) rejects band-limited interference such as an unwanted RF signal or power supply ripple More information on Filtering with math channels >>