AN EVALUATION METHOD OF LOW FREQUENCY NOISE IN COMPLEX SOUND ENVIRONMENT UNDER UNKNOWN STRUCTURE AND EXISTENCE OF BACKGROUND NOISE

摘要

The actual sound environment system exhibits various types of linear and non-linear characteristics, and it often contains an unknown structure. Furthermore, the processes observed in the sound environment inevitably contain observation noise or uncertain factors. In this paper, a method for estimating the specific signal for a sound environment system with unknown structure and observation noise of unknown statistical property is proposed by introducing a system model of the conditional probability type. The effectiveness of the proposed theoretical method is confirmed by applying it to the actual problem of signal estimation of the sound environment.