AUDIO

The Audio program turns you PC into a spectrum analyzer if it's equipped with a sound card:

Alternatively you can also use a laptop with built-in audio processing for mobile data acquisition:

The Audio program continuously monitors the input signal and computes its frequency spectrum. Both frequency and time signals are displayed and can be watched simultaneously.

The program has been used in a physics course to visualize the time dependent frequency contributions of various musical instruments (flute, electric guitar). With a microphone connected to the sound input of a laptop noise and whistles from the audience have been analyzed. The display of the software was projected on the wall of the lecture hall (using a large area display) to give the students direct response to their action.

Electrical signals like the output of a photodiode have also been recorded successfully using the Audio program.

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