a memory that stores instructions; and

a processor that executes the instructions, wherein, when executed by the processor, the instructions cause the oscilloscope to:

obtain a measurement of a first radio frequency signal;

split a first spectrum based on the first radio frequency signal into a first low-frequency band and a first high-frequency band;

perform a first Fourier transform to compute a first new spectrum based on the first spectrum;

compute a first waveform of the first new spectrum with noise of the oscilloscope reduced by performing a first inverse Fourier transform based on the first new spectrum; and

combine the first new spectrum with noise of the oscilloscope reduced with the first low-frequency band.