Signals may also be categorized by their spatial distributions as either point source signals (PSSs) or distributed source signals (DSSs). In digital electronics, digital signals are the continuous-time waveform signals in a digital system, representing a bit-stream. Particularly in digital signal processing, a digital signal may be defined as a sequence of discrete values, typically associated with an underlying continuous-valued physical process. Continuous-time signals are often referred to as continuous signals.Ī second important distinction is between discrete-valued and continuous-valued. ![]() Discrete-time signals are often referred to as time series in other fields. The most common distinction is between discrete and continuous spaces that the functions are defined over, for example, discrete and continuous-time domains. Signals can be categorized in various ways. In telephone networks, signaling, for example common-channel signaling, refers to phone number and other digital control information rather than the actual voice signal. ![]() The signal is transmitted to the receiving telephone by wires at the receiver it is reconverted into sounds. The telephone transmitter converts the sounds into an electrical signal. For example, the words " Mary had a little lamb" might be the message spoken into a telephone.
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