Pronunciation GB: ˈæmplɪtjuːd, GA: ˈæmplɪtuːd
The extent of pressure variation above or below atmospheric pressure during the production of a sound. Various measures of amplitude are possible:
- Peak amplitude: See 1 in the diagram below.
- Peak-to-peak amplitude: See 2 in the diagram below
- Root-mean-square (RMS) amplitude: This is calculated from a sampled portion of the waveform according to the formula
where N is the total number of samples and xi is the amplitude of the i th sample