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Home  >  Volume 28. No.2 (Nov. 2014)

48. Fourier Analysis of Noise Pollution Baseline In Gboko Metropolisof Benue State by A.A. Tyovenda, E.V. Tikyaa and B.V. Gurgur - Volume28, No. 2, (November, 2014), pp 365 – 372
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In this study, measurement of noise level in Gboko Metropolis of Benue State was carried out. The theoretical framework underlying environmental noise generating mechanism and its Fourier transformation is reviewed and the potential sources of noise in the study areas are identified. An integrated sound level meter device was used for the measurements. Noise pressure levels are measured and analyzed to obtain the equivalent noise levels (Leq), noise pollution level (LNP) and noise percentile levels (L90 and L10), which are basic parameters of each of the source site at a time interval of 2 minutes. The readings were thereafter interpolated using Cubic Spline Interpolation method to regenerate 3920 points at a time internal of 0.2 seconds out of the 100 points measured. The values were then used in plotting the transform graph of time to frequency domain of the analyzed data. Noise levels were found to have average value of 77.85 dB, a maximum of 103.6 dB and a minimum value of 58.6 dB in the study area. The noise levels in the assessed areas are compared with International Standard Organization (ISO) permissible noise recommended safety level of 90 dB for exposure of 8 hours; a standard also adopted by Federal Environmental Protection Agency (FEPA) in Nigeria. The average value obtained is not alarming for the town in this study since the value is below the standard safety level of 90 dB. It is thus suggested that welding and fabrication workshops, grinding machines and generators should be restricted to specific areas and those operating such machines should use earmuff..   

Keywords: environmental noise, noise effects, Fourier transformation, frequency domain.