The E-signal (Swedish: Ägovägssignal, lit. "owner's road signal") is a type of level crossing signals used in Sweden on very low-traffic roads crossing...

E and M signaling is a type of supervisory line signaling that uses DC signals on separate leads, called the "E" lead and "M" lead, traditionally used...

multiple subject fields including signal processing, information theory and biology. In signal processing, a signal is a function that conveys information...

International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International...

A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed....

America) and signal cabin (some railways e.g., GCR). Currently these decentralised systems are being consolidated into wide scale signalling centres or...

Cab signalling is a railway safety system that communicates track status and condition information to the cab, crew compartment or driver's compartment...

An analog signal (American English) or analogue signal (British and Commonwealth English) is any signal, typically a continuous-time signal, representing...

exclusively by means other than fixed signals (e.g. by written or verbal authority), token, or cab signalling. Signals exist primarily to pass instructions and...

American railroad signals generally fall into the category of multi-headed electrically lit units displaying speed-based or weak route signaling.[citation needed]...

busy signal Listen to a busy signal from North America, Hong Kong, South Korea and the Philippines. Example of an old North American busy signal Listen...

The Wow! signal was a strong narrowband radio signal detected on August 15, 1977, by Ohio State University's Big Ear radio telescope in the United States...

Railway signals in Germany are regulated by the Eisenbahn-Signalordnung (ESO, railway signalling rules). There are several signalling systems in use,...

Signal is an American open-source, encrypted messaging service for instant messaging, voice calls, and video calls. The instant messaging function includes...

Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them...

Signals intelligence (SIGINT) is the act and field of intelligence-gathering by interception of signals, whether communications between people (communications...

The railway signalling system used across the majority of the United Kingdom rail network uses lineside signals to control the movement and speed of trains...

Modern railway signalling in Thailand on the mainline employs color light signals and computer-based interlocking. The State Railway of Thailand is currently...

In signal processing, the energy E s {\displaystyle E_{s}} of a continuous-time signal x(t) is defined as the area under the squared magnitude of the...

Signal processing is an electrical engineering subfield that focuses on analyzing, modifying and synthesizing signals, such as sound, images, potential...

Signal averaging is a signal processing technique applied in the time domain, intended to increase the strength of a signal relative to noise that is...

In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal. A common example is the conversion of a sound wave...

A distress signal, also known as a distress call, is an internationally recognized means for obtaining help. Distress signals are communicated by transmitting...

Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB) in the UK, is a railroad communications system...

Signal handlers should be written in a way that does not result in any unwanted side-effects, e.g. errno alteration, signal mask alteration, signal disposition...

Level crossing signals are electronic warning devices for road vehicles at railroad level crossings. Level crossings can be operated in various ways....

many signal transduction processes, such as Immunoglobulin E signalling, T cell antigen receptor signalling, B cell antigen receptor signalling, EGF receptor...

Railway semaphore signals are an early form of fixed railway signals. The semaphore system involves signals that display their different indications to...

Traffic signal-controlled intersections next to level crossings on at least one of the roads in the intersection usually feature traffic signal preemption...

Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track...