DSP
Calculators Theory Z-Domain Filters
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Signals can be represented using two views or domains;
- Time domain refers to samples taken over time, represented in lower-case letters, eg.
x(t). - Frequency domain describes the amplitude of the waves in a signal, represented in upper-case letters, eg.
X[t].
The frequency domain contains exactly the same information as the time domain, just in a different format. If you know one domain, then you can calculate the other.
Proper Sampling
Proper sampling is defined as the ability to reconstruct an exact analog signal from samples. Thus, a digital signal that cannot be fully realised back into its original analog format is not properly sampled.