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About the application:

SmarterNoise Pro is the most advanced edition of the SmarterNoise sound meter recorders. Our Pro edition is developed especially with more advanced measurements in mind, and contains a lot of requested features such as a frequency spectrum display, export of measurement data, A-, C- or no weighting, and full screen audio measurement. Our Pro edition does not include any advertising, and performs accurately and fast. Features of SmarterNoise Pro - sound meter analyser recorder: Sound level measurement in video mode Sound level measurement in audio mode Sound meter snapshot camera Record video and audio files Limit recording length Frequency spectrum display Peak frequency detection A-, C- or no weighting Export of measurement data in CSV format HD and VGA video resolution Three video quality settings Archive for saved files Sharing of saved files Calibration Location, address Time and date Continuous Leq, LAeq, LCeq value 10 second sound level average (Leq, LAeq, LCeq) 60 second sound level average (Leq, LAeq, LCeq) Maximum and minimum decibel level About decibels and sound level measurement The unit for measuring sound is called a decibel. Because the decibel scale is logarithmic, a sound with an intensity that is twice that of a reference sound corresponds to an increase of about 3 decibels. The reference point of 0 decibel is set at the intensity of the least perceptible sound, the threshold of hearing. On such a scale a 10-decibel sound is 10 times the intensity of the reference sound. Highlighting this is necessary as already a few decibels higher or lower makes a noticeable difference in how noise is perceived. The preferred way to describe sound levels that vary over time, resulting in a single decibel value measuring the total sound energy over the period, is called Leq. It is however common practice to measure sound levels using A-weighting, which attenuates lower and higher frequencies that the average person cannot hear. In this case the value is called LAeq. A- and C-weighting The A-weighting is a standard, commonly used filter that attempts to alter the measured sound pressure levels to more closely match the perception of the human ear. A-weighting makes the sound level meter less sensitive to very high (over 8000 Hz) and low frequencies (below 1000 Hz). C-weighting also attenuates low and high frequencies, but the attenuation of low frequencies is much less severe compared to A-weighting. Calibrate: Calibrate the application using the calibration program found in the settings menu. Phones and their components vary in quality and setup so you need to calibrate the apk in order for the results to be relatively comparable. One recommendation is that you close the window and door to your bedroom or bathroom, turn off appliances, and once its very quiet calibrate the apk so the reading is about 30 decibel.