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About the application:

This application brings the functionalities of a Sound Level Meter (SLM) and a True Time Spectrum Analyzer (RTA) to your smartphone. SPL (dB) of the microphone (internal or external) signal. Suitable for acoustic measurements: - SLM: traffic or ambient noise analysis (TNI, dBA/dBB/dBC, Leq) - RTA: audio equipment frequency response analysis (spectrum, octaves, peaks, RMS) This apk has much more features (+) than the primary edition (no ads). >>SLM main features: • measurements in SPL • 3 measuring modes (Dynamic, Average, Cumulative) + 3 weighting filter curves: dBA, dBB, dBC according to DIN-IEC 651 + quick & simple calibration page • sound level against time chart • current dB value, avg (Leq), minute and max display • Leq (wideband, RMS of the observation period) • audio threshold trigger + sound level distribution chart + accumulated sound level chart + current value, Leq, L90, L50 and L10 values display + TNI (Traffic Noise index) display + exporting of measures, chart data (CSV) and screenshot (PNG) • inspected with samsung galaxy • sharing of text values and screen bmp >>RTA main features: - measurements in SPL + 5 spectrum measuring modes (dynamic, average, peak, avg/exp smoothing) - sound level against linear frequency chart + sound level against logarithmic frequency chart (HzLog) + 1/1 Octave Bands chart - 1/3 Octave Bands chart + Microphone Equalizer (Internal or External) in 1/1 Octave bands + calibration in 1/1 Octave bands + 2 spectrum views (Panel & Chart, Landscape Chart) - tap or swipe to choose the proper frequency step - long press to zoom - 4 values against chosen frequency component displayed (current, Leq, max, minute) + Leq (Octave, RMS of the observation period) + Leq (chosen frequency, RMS of the observation period) - 20hz/22kHz band, 44100 Hz sampling rate + adjustable FFT size (up to 8192, about 5 Hz accuracy) , adjustable FPS (up to 20) + exporting of measures/chart data (CSV) and screenshot (PNG) >>Data collection The application relies on the mobile microphone signal. To achieve the best results consider the following: 1) Simple Calibration (only the first time): Some mobiles are automatically calibrated in the first installation phase. For info see the calibration section of the player manual. 2) hold your fingers away from the mobile microphone 3) silence your smartphone to avoid any ring tones, vibrations and another sounds 4) orient the smartphone microphone toward the noise source keeping the correct distance 5) click on the function buttons >>Troubleshooting 1) Wrong SPL/RTA calibration: See the calibration section 2) No signals detected below 20dB or over 100dB: most smart smartphone microphones do not work under 20 dB or over 100 dB 3) Signal attenuation near band limits: the mobile mic may attenuate frequencies <100 Hz and >15000 Hz Read the embedded Player Tutorial: for any details or troubleshooting you can contact us at [email protected].