So far all the work on policy optimisation procedures has been restricted to the time domain.
Hybrid systems allow for time domains that have both continuous and discrete parts.
Seismic reflection data is initially only available in the time domain.
A spike of that intensity in the time domain is a delta function.
While the symbol t is used above, it need not represent the time domain.
However, the transformation only shows the frequency property of this function and loses its information in the time domain.
Filters in the time domain are most often requested to follow a specified frequency response.
The diagram below shows the characteristics of the transmitted signal in the time domain.
This process can also be considered in the time domain.
Many systems may be assumed to have a second order and single variable system response in the time domain.