# Digital signal

**digitaldigital signalsDigital signal (electronics)binary signalbinarysignalsdigital datadigital modulationdigitization of signalinglow-rate digital signal**

A digital signal is a signal that is being used to represent data as a sequence of discrete values; at any given time it can only take on one of a finite number of values.wikipedia

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### Signal

**signalselectrical signalsignaling**

A digital signal is a signal that is being used to represent data as a sequence of discrete values; at any given time it can only take on one of a finite number of values.

In Signals and Systems, signals can be classified according to many criteria, mainly: according to the different feature of values, classified into analog signals and digital signals; according to the determinacy of signals, classified into deterministic signals and random signals; according to the strength of signals, classified into energy signals and power signals.

### State (computer science)

**statestatefulstates**

All levels within a band of values represent the same information state.

Digital logic circuits can be divided into two types: combinational logic, whose output signals are dependent only on its present input signals, and sequential logic, whose outputs are a function of both the current inputs and the past history of inputs.

### Digital electronics

**digital circuitdigitaldigital technology**

In most digital circuits, the signal can have two possible values; this is called a binary signal or logic signal. Digital signals are used in all digital electronics, notably computing equipment and data transmission. In digital electronics a digital signal is a pulse train (a pulse amplitude modulated signal), i.e. a sequence of fixed-width square-wave electrical pulses or light pulses, each occupying one of a discrete number of levels of amplitude.

Digital electronics, digital technology or digital (electronic) circuits are electronics that operate on digital signals.

### Data transmission

**data transferdigital communicationsdigital communication**

Digital signals are used in all digital electronics, notably computing equipment and data transmission.

According to the most common definition of digital signal, both baseband and passband signals representing bit-streams are considered as digital transmission, while an alternative definition only considers the baseband signal as digital, and passband transmission of digital data as a form of digital-to-analog conversion.

### Modulation

**modulatedmodulatordigital modulation**

The shape of the waveform depends the transmission scheme, which may be either a line coding scheme allowing baseband transmission; or a digital modulation scheme, allowing passband transmission over long wires or over a limited radio frequency band.

According to one definition of digital signal, the modulated signal is a digital signal.

### Digital radio

**digitaldigital transmissionradio**

In digital radio schemes one or more carrier waves are amplitude, frequency or phase modulated by the control signal to produce a digital signal suitable for transmission.

An older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. microwave and radio frequency communication standards where analog information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.

### Boolean algebra

**Boolean logicBooleanBoolean algebra (logic)**

A waveform that switches representing the two states of a Boolean value (0 and 1, or low and high, or false and true) is referred to as a digital signal or logic signal or binary signal when it is interpreted in terms of only two possible digits.

They achieve this in various ways: as voltages on wires in high-speed circuits and capacitive storage devices, as orientations of a magnetic domain in ferromagnetic storage devices, as holes in punched card s or paper tape, and so on.

### Discrete space

**discrete topologydiscretediscrete metric**

A digital signal is a signal that is being used to represent data as a sequence of discrete values; at any given time it can only take on one of a finite number of values.

### Analog signal

**analoganalogueanalogue signal**

This contrasts with an analog signal, which represents continuous values; at any given time it represents a real number within a continuous range of values.

### List of continuity-related mathematical topics

**continuouscontinuityContinuity (mathematics)**

This contrasts with an analog signal, which represents continuous values; at any given time it represents a real number within a continuous range of values.

### Real number

**realrealsreal-valued**

This contrasts with an analog signal, which represents continuous values; at any given time it represents a real number within a continuous range of values.

### Boolean domain

**booleanboolean conditionsBoolean variables**

These correspond to the two values "zero" and "one" (or "false" and "true") of the Boolean domain, so at any given time a binary signal represents one binary digit (bit).

### Bit

**bitsbinary digitbinary digits**

These correspond to the two values "zero" and "one" (or "false" and "true") of the Boolean domain, so at any given time a binary signal represents one binary digit (bit).

### Discretization

**discretizeddiscretizingdichotomization**

Because of this discretization, relatively small changes to the analog signal levels do not leave the discrete envelope, and as a result are ignored by signal state sensing circuitry.

### Noise

**acoustic noisenoisyNoise (audio)**

As a result, digital signals have noise immunity; electronic noise, provided it is not too great, will not affect digital circuits, whereas noise always degrades the operation of analog signals to some degree.

### Noise (electronics)

**noiseelectronic noiseelectrical noise**

As a result, digital signals have noise immunity; electronic noise, provided it is not too great, will not affect digital circuits, whereas noise always degrades the operation of analog signals to some degree.

### Many-valued logic

**multi-valued logicmultivalued logicpolyvalent**

Digital signals having more than two states are occasionally used; circuitry using such signals is called multivalued logic.

### Three-valued logic

**ternary logicthree-valuedlaw of excluded fourth**

For example, signals that can assume three possible states are called three-valued logic.

### Polarization (waves)

**polarizationpolarizedpolarized light**

In a digital signal, the physical quantity representing the information may be a variable electric current or voltage, the intensity, phase or polarization of an optical or other electromagnetic field, acoustic pressure, the magnetization of a magnetic storage media, etcetera.

### Optics

**opticalopticoptical system**

In a digital signal, the physical quantity representing the information may be a variable electric current or voltage, the intensity, phase or polarization of an optical or other electromagnetic field, acoustic pressure, the magnetization of a magnetic storage media, etcetera.

### Electromagnetism

**electromagneticelectrodynamicselectromagnetic force**

In a digital signal, the physical quantity representing the information may be a variable electric current or voltage, the intensity, phase or polarization of an optical or other electromagnetic field, acoustic pressure, the magnetization of a magnetic storage media, etcetera.

### Magnetization

**magnetizedmagnetisationbound current**

### Magnetic storage

**magnetic recordingmagnetic mediamagnetic disk**

### Pulse wave

**pulsepulse trainpulsed**

In digital electronics a digital signal is a pulse train (a pulse amplitude modulated signal), i.e. a sequence of fixed-width square-wave electrical pulses or light pulses, each occupying one of a discrete number of levels of amplitude.

### Pulse-amplitude modulation

**PAMPAM-5pulse amplitude modulated**

In digital electronics a digital signal is a pulse train (a pulse amplitude modulated signal), i.e. a sequence of fixed-width square-wave electrical pulses or light pulses, each occupying one of a discrete number of levels of amplitude.