This tool uses a Discrete Fast Fourier Transform (DFFT) to separate the audio at the current selected position of the waveform into its frequency components. To use it, set the waveform cursor to the point in the audio you want to analyse and select Tools -> Frequency Analysis. In the window that opens, you should see one or two graphs displayed, known as FFT graphs. If the audio file you are analysing is of mono format, there will be one blue graph shown. If the file is stereo, there will be one blue graph for the left channel and one pink graph for the right channel.
In the top right-hand hand corner are the frequency and decibel values of the point in the graph where the mouse cursor is currently located. The decibel values range from 0dB (loudest) at the top, down to -127dB (softest). The frequency range depends on the sample rate of the audio file, ranging from 0Hz on the left to half the sample rate of the audio at the right.
To see the FFT graph in more detail, click the Zoom In buttons on either the bottom of the window or along the right-side (this will zoom the graph horizontally or vertically respectively). While zoomed in, you can use the scrollbars along the bottom and right-hand sides to scroll horizontally or vertically.
To zoom the graph out, either click on the respective Zoom Out buttons, or click the button in the bottom-right corner to set the view back to full-scale.
An alternative to using the Zoom In and Zoom Out buttons is simply resizing the FFT graph window. To do this, move the mouse cursor to any edge or corner of the window, and hold the left-mouse button down and move your mouse as appropriate.
Text To Speech (Speech Synthesis)
This tool lets you create computer generated speech from text you enter. Use the menu Tools -> Text to Speech, enter (or paste Ctrl+V) the text and click Synthesize Speech. Some trial and error can be required to get it right.
This feature requires a speech engine which is not installed on all computers. To download the Microsoft speech engine (or for foreign language speech engines) please see www.mp3audioeditor.com.
If you have a large number of files that you want to process in the same way use the Batch Converter Tool (Tools -> Batch Converter). You specify the list of files, the list of effects to be applied and Mp3 Audio Editor will do them all in one 'batch'. For more information on doing this, please see the topic Batch Converter.