# Signal

Function that conveys information about a phenomenon.

- Signal

415 related topics

## Transducer

Device that converts energy from one form to another.

A sensor is a transducer that receives and responds to a signal or stimulus from a physical system. It produces a signal, which represents information about the system, which is used by some type of telemetry, information or control system.

## Crosstalk

In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

## Noise (electronics)

Unwanted disturbance in an electrical signal.

In communication systems, noise is an error or undesired random disturbance of a useful information signal in a communication channel.

## Information

Processed, organized and structured data.

Information can be encoded into various forms for transmission and interpretation (for example, information may be encoded into a sequence of signs, or transmitted via a signal).

## Estimation theory

Branch of statistics that deals with estimating the values of parameters based on measured empirical data that has a random component.

As another example, in electrical communication theory, the measurements which contain information regarding the parameters of interest are often associated with a noisy signal.

## Data communication

Transfer and reception of data in the form of a digital bitstream or a digitized analog signal over a point-to-point or point-to-multipoint communication channel.

The data are represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal.

## Signaling (telecommunications)

In telecommunication, signaling is the use of signals for controlling communications.

## Telephone

Telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.

A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.

## Analog signal

Any continuous signal representing some other quantity, i.e., analogous to another quantity.

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

## Electronic engineering

Sub-discipline of electrical engineering which emerged in the early 20th century and is distinguished by the additional use of active components such as semiconductor devices to amplify and control electric current flow.

Electronic signal processing deals with the analysis and manipulation of signals.

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