The method research for reconstructing the modulation spectrum of radiant noises based on iterative algorithm

In order to research the propagation characteristics of radiant noise in a sound field, the line spectrum, the continuous spectrum and the modulation spectrum, which contain the target´s characteristic and can be obtained by means of filtering and characteristics extraction, are expected to reconstruct radiant noise in the simulation for radiant noise signals. An algorithm suitable for estimating the modulation depth spectrum, which utilizes the iterative algorithm, is presented. The reconstructed model of time domain radiant noise is provided in this paper. The time domain signals of measured data are reconstructed from the starting point of the modulation spectrum, before and after reconstructing; the modulation spectrum´s error is analyzed.