Patent ID: 8379703

Claim:
A signal analyzer comprising: means for processing time domain data of a signal under test to generate display data for a spectrogram of a plurality of first type frames of first type frequency domain data, wherein the processing means is operable to extract the time domain data corresponding to two or more of the first type frames as a single second type frame; means for selecting two or more of the first type frames of the spectrogram as the single second type frame; means for calculating second type frequency domain data using the time domain data corresponding to the second type frame; and means for displaying the spectrogram and the second type frequency domain data as a spectrum simultaneously wherein the displayed spectrogram and spectrum have different time and frequency resolution each other; wherein said selecting means comprises: means for designating a noise bandwidth or a resolution bandwidth; and means for calculating the time domain data amount corresponding to the second type frame depending on the designated noise bandwidth or resolution bandwidth.