METHOD AND DEVICE FOR ANALYZING AMPLITUDE MODULATED BROADBAND NOISE

摘要

The present invention is input to the analysis device (1) after it has been pre-processed by the pre-processing unit 11 as a sound signal passing a signal, and filtered by a band-pass filter (3) according to the setting of the analysis device (1) in the analysis device (1) with regard to the envelope demodulated by a demodulator (5) and the high-pass filter (7 ) is the DC component is removed by being subjected to analysis of the analyzer (9), the amplitude modulated broadband noise emitted from the body, and more particularly to a method for analyzing the operation noise emitted from the propeller propulsion station body. Analysis device (1), and generate so-called DEMON spectrum, on the basis of its spectral DEMON performs the evaluation of the setting of the analysis device (1) in the evaluation device (15). Then, on the basis of the previously calculated filter criteria and changes the setting of the band-pass filter (3) by an adaptive band-limiting module (17). At this time, the end point is formed by the ratio of the strongest spectral lines or total level of the spectrum of the noise value of DEMON DEMON spectrum. In addition, the present invention also relates to apparatus for performing such a method. ;