The following diagram shows a complex sound composed of several tones (top: spectrum; bottom: waveform).

The following diagram shows a complex sound composed of several tones (top: spectrum; bottom: waveform). Explain the pitch perception of the complex sound and the two theories accounting for the pitch perception of this complex sound.

  If you are asked to measure the loudness of a vowel sound /i/, how are you going to design the experiment? Explain your method.