Method of mapping linearly spaced spectrum points to logarithmically spaced frequency and a measuring apparatus using the method
AssigneeAgilent Technologies, Inc.
InventorsKazuhiko Ninomiya, Yoshiyuki Yanagimoto
Life of this patent
Estimating the term…
Abstract
A method for mapping a spectrum obtained from signals under test corresponding to linearly spaced frequencies to logarithmically spaced frequencies in a measuring apparatus. A spectrum within a predetermined frequency range from logarithmically spaced frequencies is selected from this spectrum corresponding to linearly spaced frequencies and vector averaging of the selected spectrum is performed.
Claims4
A spectrum processing method whereby a spectrum obtained from signals under test and corresponding to linearly spaced frequencies is brought to correspond to logarithmically spaced frequencies by a measuring apparatus, said method comprising one step selected from the group consisting of:
- (i) performing vector averaging on said spectrum selected from said spectra corresponding to linearly spaced frequencies;
- (ii) selecting said spectrum within a predetermined frequency range from logarithmically spaced frequencies from said spectra corresponding to linearly spaced frequencies and performing vector averaging on the selected spectrum;
- and
- (iii) performing vector averaging in terms of frequency on said spectrum corresponding to linearly spaced frequencies while logarithmically increasing the objects of averaging with an increase in frequency.
A measuring apparatus for finding a spectrum obtained from signals under test and corresponding to linearly spaced frequencies, wherein said spectrum is brought to correspond to logarithmically spaced frequencies by a spectrum processing method whereby a spectrum obtained from signals under test and corresponding to linearly spaced frequencies is brought to correspond to logarithmically spaced frequencies by a measuring apparatus, said method comprising one step selected from the group consisting of:
- (i) performing vector averaging on said spectrum selected from said spectra corresponding to linearly spaced frequencies;
- (ii) selecting said spectrum within a predetermined frequency range from logarithmically spaced frequencies from said spectra corresponding to linearly spaced frequencies and performing vector averaging on the selected spectrum;
- and
- (iii) performing vector averaging in terms of frequency on said spectrum corresponding to linearly spaced frequencies while logarithmically increasing the objects of averaging with an increase in frequency.
A measuring apparatus for finding a cross spectrum obtained from the signals distributed from the signals under test and corresponding to linearly spaced frequencies, wherein said cross spectrum is brought to correspond to logarithmically spaced frequencies.
Dependencies are inferred from the claim text.