WavePad FFT Sound Analyzer

Powerful Audio Analysis and Spectrogram Software

WavePad features two very useful tools for performing sound analysis on the spectral content of audio, the Fast Fourier Transform (FFT) and the Time-Based Fast Fourier Transform (TFFT), in addition to extensive audio editing functionality.

Typical Applications

Audio Spectrum Analysis
Vibration Testing and Analysis
Noise Detection and Removal

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The FFT is designed to illustrate characteristics of audio at only one point in time, whereas the TFFT creates a graph over time for the duration of an audio clip. These tools have applications in a number of areas, including linguistics, mathematics and sound engineering.

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Advanced Audio Analysis Features

Perform a spectral analysis of audio at any one point in time, or across an entire duration
FFT has ability to zoom in on either x-axis or y-axis to see graph in more detail
TFFT has zoom ability as well as a color intensity specifier to choose the intensity at which colors are represented in the graph
Graphs are presented in a simple and intuitive fashion, allowing for optimal viewing and analysis
Graphs are plotted using frequencies up to half the sample rate of the audio and intensities up to 0dB
Navigate through, or even play your file, and see real-time updates to both graphs. The FFT updates instantly, and the TFFT graph cursor updates to the same point as in the audio file
Works with any audio files that can be loaded into WavePad
Export TFFT graph as an image file - PNG, JPG, GIF or BMP

FFT Graph

The FFT graph works by taking a small sample of audio and plotting a graph of frequency (x-axis, in Hz) versus intensity (y-axis, in dB). The graph features two different plots if the audio is stereo, otherwise just the one plot will be displayed. The frequency of the graph ranges from 0Hz to half the sample rate of the audio, whilst the intensity range goes from -128dB to 0dB.

TFFT Graph

The TFFT graph works by plotting the intensity of the frequency spectrum of the audio across time, and represents intensity through color. The x-axis is used for time (in hh:mm:ss format) and spans the duration of the audio selection. The y-axis is used for frequency (in Hz) and depicts the spectrum of the audio at any one point in time (like the FFT it goes up to half the sample rate of the audio). Then at every point in time and frequency, an intensity calculation is done and a dB figure is calculated (between -128dB and 0dB). This figure is mapped to a color intensity scale and then drawn on the graph, with pure black representing -128dB and pure white representing 0dB.

Frequency Analysis (FFT)

Temporal Frequency Analysis (TFFT)
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