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A command available in the Modify menu when you select one or more Sound objects. With this command you multiply the amplitude of each Sound in such a way that its absolute peak becomes the new absolute peak that you specify (see Settings).
The absolute peak of the following sound is 0.033:
This sound will play rather weakly. To make it louder, you can do Scale peak... with a new absolute peak of 0.99. Praat will then multiply the waveform by 30, changing the sound to the following:
The absolute peak is now 0.99, and the sound will play loudly.
The reverse is also possible. The absolute peak of the following sound is 19.8:
This sound will not play correctly: all samples with an amplitude outside the [-1;+1] range will be clipped to -1 or +1. To make this sound nicer to play, you can again do Scale peak... with a new absolute peak of 0.99. Praat will then divide the waveform by 20, changing the sound to the following:
The absolute peak is now 0.99, and the sound will play without distortion.
© ppgb 20100328