A HIERARCHICAL EXTRACTION OF HIGHER ORDER CORRELATION BETWEEN SOUND AND ELECTROMAGNETIC WAVES AROUND A VDT ENVIRONMENT - PRACTICAL USE OF BACKGROUND NOISE AND PROBABILITY PREDICTION

摘要

In this paper, a probabilistic signal processing method which is possible to give any methodological suggestion to the measurement method of compound and/or accumulation effect in electromagnetic (abbr. EM) environment is discussed. In order to extract various types of latent interrelation characteristics between waved environmental factors (sound and EM waves) leaked from the real operation VDT, an extended regression system model reflecting hierarchically not only linear correlation information of the lower order but also nonlinear correlation information of the higher order is firstly introduced. Then, through identifying each regression parameter of this model based on a practical use of a background EM noise, some evaluation methods for predicting a whole fluctuation distribution form from sound to EM are newly proposed. Finally, the validity and effectiveness of this proposed method are experimentally confirmed too by applying it to the actually observed data leaked by a VDT with some television games in the room of an actual working environment.