Analog signal

analoganalogueanalogue signalanalog signalssignalAna'''loganalog audio signalsanalog communicationanalog deviceanalog electrical signal
An analog signal is any continuous signal for which the time-varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.wikipedia
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Audio signal

audioaudio channelchannel
For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.
An audio signal is a representation of sound, typically using a level of electrical voltage for analog signals, and a series of binary numbers for digital signals.

Discrete time and continuous time

discrete timediscrete-timecontinuous-time
An analog signal is any continuous signal for which the time-varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.
A signal of continuous amplitude and time is known as a continuous-time signal or an analog signal.

Signal

signalselectrical signalsignaling
The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, human speech, and other systems may also convey or be considered analog signals.
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.

Generation loss

digital generation lossa copy of a copy may not be as 'sharp' as the originalcopies of analog recordings tend to degrade when copied
As the signal is copied, transmitted, or processed, the unavoidable noise introduced in the signal path will accumulate as a generation loss, progressively and irreversibly degrading the signal-to-noise ratio, until in extreme cases, the signal can be overwhelmed.
In analog systems (including systems that use digital recording but make the copy over an analog connection), generation loss is mostly due to noise and bandwidth issues in cables, amplifiers, mixers, recording equipment and anything else between the source and the destination.

Analog recording

analoganalogueanalog audio
Analog recording (Greek, ana is "according to" and logos "relationship," "word") is a technique used for the recording of analog signals which, among many possibilities, allows analog audio and analog video for later playback.

Communication channel

channelchannelscommunications channel
An analog signal is subject to electronic noise and distortion introduced by communication channels and signal processing operations, which can progressively degrade the signal-to-noise ratio (SNR).

Analog signal processing

analoganalog-control voltages
Analog signal processing is a type of signal processing conducted on continuous analog signals by some analog means (as opposed to the discrete digital signal processing where the signal processing is carried out by a digital process).

Analog-to-digital converter

ADCanalog to digital converteranalog-to-digital conversion
In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.

Digital video

videodigitaldigitally
This is in contrast to analog video, which represents moving visual images with analog signals.

Digital audio

digital musicdigitalaudio
In a digital audio system, an analog electrical signal representing the sound is converted with an analog-to-digital converter (ADC) into a digital signal, typically using pulse-code modulation.

Videotape

videocassettevideo tapevideo
Information stored can be in the form of either an analog signal or digital signal.

Analog device

analoganalogueanalog media
In theory, the continuous information (also analog signal) has an infinite number of possible values with the only limitation on resolution being the accuracy of the analog device.

Video

analog videovideo albumvideo recording
Analog video is a video signal represented by one or more analog signals.

Analog computer

analogue computeranaloganalog computers
An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.

Voltage

potential differenceVvoltages
For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves. In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.

Sound pressure

sound pressure levelSPLacoustic pressure
For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.

Digital signal (signal processing)

digital signaldigitaldigital signals
It differs from a digital signal, in which the continuous quantity is a representation of a sequence of discrete values which can only take on one of a finite number of values.

Discrete space

discrete topologydiscretediscrete metric
It differs from a digital signal, in which the continuous quantity is a representation of a sequence of discrete values which can only take on one of a finite number of values.

Classical mechanics

Newtonian mechanicsNewtonian physicsclassical
The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, human speech, and other systems may also convey or be considered analog signals.

Pneumatics

pneumaticpneumaticallycompressed air
The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, human speech, and other systems may also convey or be considered analog signals.

Hydraulics

hydraulichydraulicallyhydraulic system
The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, human speech, and other systems may also convey or be considered analog signals.

Barometer

barometricaneroid barometerbarometers
For example, an aneroid barometer uses rotary position as the signal to convey pressure information.

Electric current

currentelectrical currentcurrents
In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.

Frequency

frequenciesperiodperiodic
In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.

Sound

audiosound wavesound waves
Any information may be conveyed by an analog signal; often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure.