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 NoiseScout - Unattended Noise Monitoring with user-defined Day/Night-Limits
NoiseScout is the professional solution for unattended sound level monitoring. Around the clock, all the levels recorded with the XL2 Sound Level Meter are available in real-time on a website for viewing in graphs and for download. Automatic alert emails are sent as soon as a limit is exceeded. The latest NoiseScout feature offers the ability to set individual limits for day and night.
NoiseScout constantly monitors for alarm conditions, both for short-term, unattended measurements of a few hours, as well as for long-term measurements over many months. The XL2 stores the sound level data on site and transmits it automatically to the NoiseScout server. Your web browser displays the measured values graphically. Automatic emails inform you about any limits exceeded at the measuring location. This gives you a robust 24/7 control of the sound levels.
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Let’s Clear Up Some Things About FFT… 
The "Fast Fourier Transformation" (FFT) is an important measurement method in the science of audio and acoustics measurement. It converts a signal into individual spectral components and thereby provides frequency information about the signal. FFTs are used for fault analysis, quality control, and condition monitoring of machines or systems. This article explains how an FFT works, the relevant parameters and their effects on the measurement result.
Strictly speaking, the FFT is an optimized algorithm for the implementation of the "Discrete Fourier Transformation" (DFT). A signal is sampled over a period of time and divided into its frequency components. These components are single sinusoidal oscillations at distinct frequencies each with their own amplitude and phase. This transformation is illustrated in the following diagram. Over the time period measured, the signal contains 3 distinct dominant frequencies.
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