Non-stationary signals are divided into continuous and transient types. Examples of non-stationary continuous signals are the vibration produced by a jackhammer and the sound of a fireworks display. Transient signals are defined as signals which start and end at zero level and last a finite amount of time. They may be very short, or quite long. Examples of transient signals are a hammer blow, an airplane flyover noise, or a vibration signature of a machine run up or run down.
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