ABSTRACT
Figure 8.1 shows an example waveform for some of the signals of Table 8.1. In general, the “sharpness” of the shape of each signal corresponds to its high-frequency components, and the more jagged the signal, the higher the frequency range. us, over a 25-msec interval, the high-›delity audio signal shown in Figure 8.1b is more jagged than the speech signal in Figure 8.1a. Periodic signals (e.g., the musical note shown in Figure 8.1c) consist primarily of a single fundamental frequency plus smaller harmonic components that cause the waveform to deviate from a precise sinusoidal shape.
