"Sound Level Analyzer" is a sound level meter and real-time sound analysis tools for the iPhone.It can be displayed the sound level measurement and signal analysis simultaneously, and is available in a variety of applications such as the neighboring environmental noise measurement and sound check of Live events.In Ver2.0, the measurement display of the long term average equivalent sound level has been added as a new feature. It will be measured time-averaged noise level easily."Sound Level Analyzer" has our advanced digital signal processing algorithms to process acoustic frequency weighting filter and to measure real-time sound levels.A-weighting filter is provided a roll off of low frequencies and high frequencies fairly steeply for human ears. C-weighting filter is provided a roll off of low and high frequencies slightly for music. The response time of all measurements can be also selected from ANSI Fast or Slow parameter."Sound Level Analyzer" also has three modes of sound signal analysis, which are Time-domain Graph, Frequency Spectrum Analyzer and FFT Analyzer. Time-domain Graph is a sound level time chart and works by plotting the measured sound level, applying a weighting filter."Sound Level Analyzer" comes pre-calibrated for the built-in mic, but you can adjust the calibration if you have a calibrated standard sound level meter. The WHO has proven direct links between noise and health risks; tinnitus, sleep disturbance, stress, cognitive impairment, heart diseases and annoyance in general. Please check your environmental noise for your wellness.Features:- Sound Level Measurement function: "Leq" (equivalent continuous sound level), "Leq ave" (Long-term average equivalent sound level), "Lmin" (Minimum sound level of Leq), "Lmax" (Maximum sound level of Leq).- Display level dynamic range: 0 - 130dB - Supports frequency weighting filter: A, C, and Z (without filter). - Supports Time weighting: 125ms (Fast), 1sec (Slow)- Frequency range: 20Hz - 20kHz- Calibration function: offset value from -20.0dB to 20.0dB- Display resolution: 0.1dB- Peak measurement range: around 110dB (by built-in mic performance)- Pause the screen during measurement.- Setting of measurement duration: 10sec - 1hour, Infinite (Default setting: 60sec)- Capture the measurement results with Time-stamp and GPS location data to Camera-roll.- Time-domain Graph function: Sound level graph chart (TIME mode)- Frequency Spectrum Analyzer function (1/3 Oct mode)- FFT Analyzer function(FFT mode)Applications:- Live Sound - Environmental noise measurement - Installation of audio equipment - Tuning of audio equipment- Architectural acoustics - Broadcast - Device managementExample of the noise level situation: - 130dB : airplane engine sound- 110dB : horn of the car- 100dB : train passing sounds- 90dB : noisy factory- 80dB : train, vacuum cleaner- 70dB : noisy office, street- 60dB : quiet car, normal conversation- 50dB : quiet office- 40dB : library, quiet residential area- 30dB : midnight suburbs, whisper- 20dB : sound of rubbing leavesNote:This app is adjusted the reference value for iPhone. However, the built-in microphone of your iPhone is likely to have a non-uniform gain. The more exact measurement should be calibrated using the absolute level calibration devices. At the time of the first access to built-in Microphone and Photos after installing the app, you will be asked authorization to access them by the iOS system. If you do not enabled this setting, the app can not access them by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy > Photos or Microphone".This app uses the location information service for screen shot function of the measurement result. Noise measurement will generally require iPhone microphone input of a long term. In order to reduce power consumption, this app allows for background audio.