Diagnostic System for Sound Fields can measure orthogonal factors and calculate subjective attributes of sound fields. All the functions of the Realtime Analyzer Light, Realtime Analyzer IPR, and Realtime Analyzer ACF are included. Based on the model of auditory-brain system which consists of the autocorrelation mechanism, the interaural crosscorrelation mechanism between the both auditory pathways, and the specialization of human cerebral hemispheres, the new diagnostic system was developed.