Digital signal
![A received digital signal may be impaired by noise and distortions without necessarily affecting the digits](/Images/godic/202412/24/Imagen_44206.png")
![In signal processing, a digital signal is an abstraction that is discrete in time and amplitude, meaning it only exists at certain time instants.](/Images/godic/202412/24/Digital.signal.discret.svg4206.png")
![A frequency shift keying (FSK) signal is alternating between two waveforms, and allows passband transmission. It is considered digital in literature on data transmission.](/Images/godic/202412/24/Frequenzumtastung4206.jpg")
![](/Images/godic/202412/24/S_Digital.svg4206.png")
A digital signal is a signal that represents a sequence of discrete values. A logic signal is a digital signal with only two possible values, and describes an arbitrary bit stream. Other types of digital signals can represent three-valued logic or higher valued logics.