Patent ID: 6445327
Filing Date: 2002-09-03
Classification: G01R

Abstract:
A signal analyzing apparatus comprising:a frequency conversion unit that converts input signals into those of intermediate-frequencies using a predetermined local oscillation frequency; a sweeping unit that sweeps said local oscillation frequency over a sweeping frequency range in a predetermined sweeping time; a filter that receives signals output from said frequency conversion unit and selectively passes signals having frequency components of a predetermined bandwidth; an A/D conversion unit that samples the signals that have passed said filter and converts them into predetermined digital data; a data storage unit that saves the digital data converted by the A/D conversion unit; a signal processing unit that conducts signal processing, extending the digital data saved in said data storage unit into frequency spectrum data; a correction data storage unit that saves correction data representing delay times for the bandwidth of said filter; a control unit that causes the signal processing unit to process signals so that a measured frequency corresponding to the local oscillation frequency for starting sweep in said sweeping unit and the digital data corresponding to said measured frequency saved in said data storage unit may be processed in a one-to-one relationship in said signal processing unit by changing the timing at which data is sent from said A/D conversion unit to said signal processing unit via said data storage unit based on the correction data saved in the correction data storage unit; and an output unit that outputs the frequency spectrum data which has been processed in the signal processing unit.