The sample rate, in samples/second (44100 in the example) Also shown in large text in this region is the currently measured SPL level, as calculated directly from the audio data stream (this number is not FFT based.) In smaller text, at the top left of the region, are three numbers following the word "Mic". The vertical scale dynamically adjusts to the prevailing levels. ![]() The middle region shows an oscilloscope-like realtime display of the audio data being picked up by the microphone. ![]() Also shown above each of the octave bars are blue marker lines that indicate the maximum level observed so far at that frequency. Also shown is the current peak frequency, in Hz (the screen shot shown has 121Hz) - this value is typically accurate to within a few Hz, depending on the sampling rate (see below). The height of the bars changes with the incoming audio signal being picked up by the microphone (or by an input device connected to the phone's headset jack). The horizontal axis is a logarithmic frequency scale that is marked at the ISO frequency centres (unless the user has selected the linear frequency scale option, see below). ![]() The vertical axis is labelled in deciBels. The top region shows the RTA frequency response in ISO one octave bars, as calculated by an FFT of the incoming audio data. The screen is divided into three regions: When AudioTool is started, you will see the main screen for the Real Time Analyser (RTA).
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