Since the modulus of the complex sinusoid is constant, it must lie on a circle in the complex plane. For example,
We may call a complex sinusoid a positive-frequency sinusoid when . Similarly, we may define a complex sinusoid of the form , with , to be a negative-frequency sinusoid. Note that a positive- or negative-frequency sinusoid is necessarily complex.
Projection of Circular Motion
Audio Decay Time (T60)