signal - meaning and definition. What is signal
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What (who) is signal - definition

VARYING PHYSICAL QUANTITY THAT CONVEYS INFORMATION
Electrical signal; Signalling; Signaling; Weak signals; Signal (signal processing); Signalling system; Signal system; Signal systems; Signal (information theory); Signal (circuit theory); Signals; SIGNAL; Signal (electronics); Signals and systems; Electrical Signal; Signal (electrical engineering); Radio frequency signal
  • A digital signal has two or more distinguishable waveforms, in this example, high voltage and low voltages, each of which can be mapped onto a digit. Characteristically, noise can be removed from digital signals provided it is not too extreme.
  • A binary signal, also known as a logic signal, is a digital signal with two distinguishable levels
  • sampling]]
  • Signal transmission using electronic signals
  • In ''The Signal'' by [[William Powell Frith]], a woman sends a signal by waving a white handkerchief.

SIGNAL         
<language> A synchronous language by Le Guernic et al of INRIA. ["SIGNAL - A Data Flow-Oriented Language for Signal Processing," P. le Guernic, IEEE Trans Acoustics Speech & Signal Proc, ASSP-34(2):362-1986-04-374]. (1996-12-10)
signal         
<operating system> A predefined message sent between two Unix processes or from the kernel to a process. Signals communicate the occurrence of unexpected external events such as the forced termination of a process by the user. Each signal has a unique number associated with it and each process has a signal handler set for each signal. Signals can be sent using the kill system call. (1996-12-10)
signal         
I. n.
Token, mark, indication, sign.
II. a.
Eminent, memorable, extraordinary, remarkable, notable, conspicuous.

Wikipedia

Signal

In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The IEEE Transactions on Signal Processing includes audio, video, speech, image, sonar, and radar as examples of signal. A signal may also be defined as any observable change in a quantity over space or time (a time series), even if it does not carry information.

In nature, signals can be actions done by an organism to alert other organisms, ranging from the release of plant chemicals to warn nearby plants of a predator, to sounds or motions made by animals to alert other animals of food. Signaling occurs in all organisms even at cellular levels, with cell signaling. Signaling theory, in evolutionary biology, proposes that a substantial driver for evolution is the ability of animals to communicate with each other by developing ways of signaling. In human engineering, signals are typically provided by a sensor, and often the original form of a signal is converted to another form of energy using a transducer. For example, a microphone converts an acoustic signal to a voltage waveform, and a speaker does the reverse.

Another important property of a signal is its entropy or information content. Information theory serves as the formal study of signals and their content. The information of a signal is often accompanied by noise, which primarily refers to unwanted modifications of signals, but is often extended to include unwanted signals conflicting with desired signals (crosstalk). The reduction of noise is covered in part under the heading of signal integrity. The separation of desired signals from background noise is the field of signal recovery, one branch of which is estimation theory, a probabilistic approach to suppressing random disturbances.

Engineering disciplines such as electrical engineering have advanced the design, study, and implementation of systems involving transmission, storage, and manipulation of information. In the latter half of the 20th century, electrical engineering itself separated into several disciplines: electronic engineering and computer engineering developed to specialize in the design and analysis of systems that manipulate physical signals, while design engineering developed to address the functional design of signals in user–machine interfaces.

Examples of use of signal
1. Mubarak responds÷ signal left, signal right, and then park.
2. The signal won‘t get snowy and fuzzy like the old analog signal.
3. The tags use a circuit that emits an identifying signal when prompted by a radio signal.
4. We reject the war crimes." And that would be a powerful signal, if the Serbs could send that signal.
5. The tags use a circuit that emits an identifying a signal when prompted by a radio signal.