Acoustical Properties of Aircraft Noise Measured by Temporal and Spatial Factors

Measurement of Regional Environmental Noise by Use of a Pc-Based System. An Application to the Noise Near Airport “G. Marconi” in Bologna

“…According to the measurements for the #ying aircraft [15], the integration interval should be less than 0)5 s. In the present measurements, the integration interval was 0)5 s. However, there is a possibility that the integration interval may vary according to the C value of a target sound source [16]. This means that a longer integration interval is necessary for noise with a strong tonal component.…”

Preliminary Study on Recommended Time Duration of Source Signals to Be Analyzed, in Relation to Its Effective Duration of the Auto-Correlation Function

“…P and the ( C ) KGL for each sound source: ᭡, telephone ringing; *, the fan noise of the air conditioner; , the sound of the key-punch; ᭝, the fan noise of the personal computer; ᮀ, voice; #, music H; , music I; ;, motif A; ᭛, motif B [5]; ᭹, aircraft noise A; ᭜, aircraft noise B [6]. …”

A Computational Software for Noise Measurement and Toward Its Identification

“…are not used for the identi"cation in this paper, spatial information on the noise source including its degree of di!useness and its direction from the receiver can be described by these spatial factors. Experimental results which include spatial factors from the IACF are demonstrated in references [11,12] in this special issue. Figure A1, s G is the arithmetic mean of the standard deviations (SD) for all categories of the ACF factor.…”

“…The computational Figure A1. The method to compute the weighting coe$cients, = V in equation (12). system described here may be useful for characterizing environmental noises.…”