This video considers a wider class of nonstationary processes that share some similarities with wide-sense periodic processes. Such nonstationary processes occur in systems where, for example, there is some aspect of upsampling, or a random process generates a new process that is a function of some deterministic signal that has temporal extent. This video looks at wide-sense periodic and wide-sense cyclo-stationary processes. An example of pulse-amplitude modulation is presented. Finally, globally non-stationary but locally-stationary processes are discussed, called quasi-stationary processes. The application of speech modelling is considered as an example of a quasi-stationary process.