Page 103 - Master Handbook of Acoustics

FIGURE 5-1 Sound spectrographs of common sounds. Time progresses to the right, the vertical scale

is frequency, and the intensity of components is represented by the intensity of the trace. (AT&T Bell
Laboratories.)

The human voice mechanism is capable of producing many sounds other than speech. Figure 5-2
shows a number of these sound spectrographs. Harmonic series appear on a spectrograph as more or
less horizontal lines spaced vertically in frequency. These are particularly noticeable in the trained
soprano’s voice and the baby’s cry, but traces are also evident in other spectrographs.