Patent ID: 7519491

Claim:
A data processing method for a signal analyzer that digitizes an input signal into digital data, and using calculation to produce display spectrum data, having a frequency axis, comprising: defining a sampling interval based upon a given time corresponding to an equivalent sweep time; replacing the frequency axis of the display spectrum data with a time axis based upon the corresponding time to produce time-based spectrum data; applying filter characteristics to the time-based data to produced filtered time-based spectrum data, wherein the step of applying filter characteristics further comprises: performing an FFT on the time-based spectrum data to produce frequency domain data; multiplying the frequency domain data by a frequency response corresponding to the filter characteristics to produce filtered frequency domain data; and performing an inverse FFT on the filtered frequency domain data to produce filtered time-based spectrum data; replacing the time axis of the filtered time-based spectrum data with the frequency axis to produce filtered display spectrum data; and displaying the filtered display spectrum data.