Above is the waveform produced by an English speaker saying the word “Wikipedia”. The voice is a set of complex sounds: long throated sounds (vowels) with shorter, higher sounds in between (consonants). Note the top recording is much louder in general than the bottom one.
You can tell from the vertical size of the waveform how loud it is – its amplitude. Amplitude (“Volume”)Ībove is a pair of stereo recordings as shown in Audacity – the left and right tracks of a recent song from a CD, followed by the left and right tracks of the same song on a vinyl LP record. The visual representation of this is called a waveform. In practice, sound captured by a microphone (or our ears) will nearly always be a complex wave – lots of different sounds of differing volumes stacked upon one another. A raspy sound like a washing machine or a librarian going “shhhh” will be a very complex wave. A very pure sound like from a flute or a tuning fork will look like a pure sine wave.
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