A-weighting for sound pressure level (the most commonly used weighting used to emphasize frequencies around 3¨C6 kHz where the human ear is most sensitive, while attenuating very high and very low frequencies to which the ear is insensitive).
Support for upside down device orientation (mic towards sound source).
Decibel meter calibration (shift and scale).
Sonic Scan uses your iPhones built-in microphone to measure sound. Sound pressure ranges from approx. 35 up to 105 decibels.
The real time frequency value displayed shows zero-crossings per second. Time Frequency Representation (short-time Fourier transform) is calculated and displayed after the user presses the Stop button.
