MEASUREMENT OF REGIONAL ENVIRONMENTAL NOISE BY USE OF A PC-BASED SYSTEM. AN APPLICATION TO THE NOISE NEAR AIRPORT “G. MARCONI” IN BOLOGNA
✍ Scribed by H. SAKAI; S. SATO; N. PRODI; R. POMPOLI
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 256 KB
- Volume
- 241
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Measurements of aircraft noise were made at the airport &&G. Marconi'' in Bologna by using a measurement system for regional environmental noise. The system is based on the model of the human auditory}brain system, which is based on the interplay of autocorrelators and an interaural cross-correlator acting on the pressure signals arriving at the ear entrances, and takes into account the specialization of left and right human cerebral hemispheres (see reference [8]). Measurements were taken through dual microphones at ear entrances of a dummy head. The aircraft noise was characterized with the following physical factors calculated from the autocorrelation function (ACF) and interaural cross-correlation function (IACF) for binaural signals. From the ACF analysis, (1) energy represented at the origin of 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, were extracted. From the IACF analysis, (5) IACC, (6) interaural delay time at which the IACC is de"ned, '!! , and (7) width of the IACF at the '!! , = '!! were extracted. The factor (0) can be represented as the geometrical mean of the energies at both ears. A noise source may be identi"ed by these factors as timbre.