DIAGNOSTIC SYSTEM BASED ON THE HUMAN AUDITORY–BRAIN MODEL FOR MEASURING ENVIRONMENTAL NOISE—AN APPLICATION TO RAILWAY NOISE

✍ Scribed by H. SAKAI; T. HOTEHAMA; Y. ANDO; N. PRODI; R. POMPOLI

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 875 KB
• Volume: 250
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.3884

✦ Synopsis

Measurements of railway noise were conducted by use of a diagnostic system of regional environmental noise. The system is based on the model of the human auditory}brain system. The model consists of the interplay of autocorrelators and an interaural crosscorrelator acting on the pressure signals arriving at the ear entrances, and takes into account the specialization of left and right human cerebral hemispheres. Di!erent kinds of railway noise were measured through binaural microphones of a dummy head. To characterize the railway noise, physical factors, extracted from the autocorrelation functions (ACF) and interaural crosscorrelation function (IACF) of binaural signals, were used. The factors extracted from ACF were (1) energy represented at the origin of the delay, (0), (2) e!ective duration of the envelope of the normalized ACF, C , (3) the delay time of the "rst peak, , and (4) its amplitude, . The factors extracted from IACF were (5) IACC, (6) interaural delay time at which the IACC is de"ned, '!! , and (7) width of the IACF at the '!! , = '!! . The factor (0) can be represented as a geometrical mean of energies at both ears as listening level, ¸¸.