Effects of Multiple Tones

Beats
- Perception of intensity changes from two nearby frequencies
- From constructive and destructive interference
- Frequency of beating is difference in frequency between the two tones, e.g. 101-100 = 1 Hz beats
Missing fundamental
- Fundamental is lowest pitch of a tone
- higher frequencies called harmonics or partials
- Perceive a same pitch even without fundamental
- Allows us to tell female vs. male voices on the telephone.