![]() For the longitudinal study, a sample size of 15 persons who had worked in the Calabar Timber Market from July 2002 (when the first blood pressure assessment was carried out) to July 2006 (when the second blood pressure assessment was carried out) was used. In the low noise zone with equivalent continuous A-weighted sound pressure levels under 80 dB, 1000 people were also randomly selected and used as the control group. A sample size of 1000 people in the high noise zones with equivalent continuous A-weighted sound pressure levels over 80 dB was randomly selected and used as the study group. ![]() For the cross-sectional study, a 39-item questionnaire was used for the subjective measure. Correlation metering is available as well.A cross-sectional and longitudinal study of the effects of loud noise on residents of Calabar, Nigeria, has been carried out using subjective and objective measures. SPAN Plus displays level metering statistics, headroom estimation, and clipping detection. SPAN Plus also features output level metering with adjustable ballistics and integration time, EBU R128, K-system metering (including calibration K-system metering). Spectrum can be smoothed out visually for an easier examination.īeside multi-track spectrum comparison, SPAN Plus supports multi-channel analysis and can be set to display spectrums from two different channels or channel groups at the same time. ![]() Beside that you can choose to display secondary spectrum of a desired type (e.g. You may specify Fourier block size in samples, FFT window overlap percentage, spectrum's visual slope. SPAN Plus provides you with a very flexible “mode” system which you can use to setup your spectrum analyzer preferences. SPAN Plus is an extended version of the freeware SPAN plugin: SPAN Plus provides several additional features such as PNG file export, real-time spectrum import/export for multi-track spectrum comparisons, static spectrums display, and a “wide” display mode. SPAN Plus is a real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit, and VST plugin for professional music and audio production applications. RMS, true peak level, and clipping detector. ![]() ![]()
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