‘Friture’ is a free and open source application that lets you analyze audio inputs in real-time using ‘Spectrograms’. It runs in GNU/Linux, MS Windows and Mac OS X and comes with an easy to use ‘dashboard/window’ that consists of built in spectrograms and other widgets that you can add/remove easily (including detaching form the main window).
Again, please remember that, it is not a spectrogram generator of audio files such as ‘Spek’ but only a live audio input analyzer. You can also ‘fine-tune’ each spectrum ‘dock’ by adjusting the Frequency scales, update intervals, set min/max Decibel (dB) levels, add/remove ‘bands’ from the graphs etc.
Since those ‘pretty graphs’ do require a reasonable amount of CPU power ;-), you can temporarily disable the audio analyzing by using the ‘Stop’ button without having to exit the application as well.
Few other main features …
*. As mentioned above, has few built in spectrogram widgets such as:
1. ‘Levels’ widget: Displays audio levels (dB) for each 20 ms (milliseconds).
2. ‘Scope’ widget: Shows a graph of audio signal vs time (up to 20 ms long).
3. ‘FFT Spectrum': Shows a graph of ‘Power Spectral Density’ (PSD) vs the audio frequency (20 Hz up to 20,000 Hz). Unlike the above widgets, this one lets you adjust its settings such as changing the min/max frequency levels, use single or dual-channel modes, adjust FFT size and more.
4. ‘2D Spectrum': Displays a graph of Frequency vs time (up to 10 seconds by default) with each color representing different PSD levels. This one too lets you change change few of its settings with ease.
5. ‘Octave Spectrum': Displays a graph between spectral density (PSD) vs Frequency and updates the graphs slowly (unlike the ‘FFT’). And you can use its configuration window to change few settings.
6. ‘Generator': This lets you manually generate audio signals using few built in presets (‘Sine’, ‘White noise’, ‘Burst’ etc).
7. ‘Delay Estimator': Shows you the delay between the audio channels (only works in multichannel mode, of course).
That’s pretty much it.
If interested, you can get it form this ‘Friture’ home page.
The installation in Windows is a breeze thanks to the single installer. However, under GNU/Linux and Mac OS X, you might have to install some of its dependencies first. But all the proper instructions can be found in its ‘download’ section, so make sure to read it through if you’re gonna install it in those OS platforms. Good luck.