![]() Tracking Peak Amplitude of an Audio Signal ![]() The left channel of the sound source (the left outlet of the left selector~ object) is connected to another part of the patch, which will track the sound's amplitude. So, in the above example, the umenu has already selected the sfplay~ object as the sound source, the soundfile has already been opened by the open talk.aiff message, the rate of sfplay~ has been set to 1, and the output volume has been set to 0.5. We've used a loadbang object (in the upper-middle part of the patch) to open an AIFF soundfile talk.aiff and a QuickTime movie dishes.mov, and to initialize the settings of the user interface objects with a preset. The popup menu lets you select one of two audio sources: adc~ or sfplay~ In the upper-right corner of the patch we've made it easy for you to try out either of two audio sources: the audio input of the computer or a pre-recorded soundfile. ![]() This tutorial demonstrates how to track the amplitude of an MSP audio signal, how to use the tracked amplitude to detect discrete events in the sound, and how to apply that information to trigger images and control video effects. ![]()
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