signal means
21signal — A means of communication. An incitement to action or to the avoidance of danger. An indication of an act to follow. A demonstration by a motorist, with hand, light, or mechanical device, to warn other users of his intended movement, such as… …
22traffic signal — Red light Red light 1. an electrically operated set of lights at a road intersection which has different lights visible to traffic from different directions, designed to control vehicle traffic through the intersection. Each set of lights… …
23Sampling (signal processing) — Signal sampling representation. The continuous signal is represented with a green color whereas the discrete samples are in blue. In signal processing, sampling is the reduction of a continuous signal to a discrete signal. A common example is the …
24Citation signal — Introductory signals are used in legal citations to present authorities and show how the authorities relate to propositions in textual statements. A legal writer uses an introductory signal to tell readers how her citation to legal authority… …
25Analog signal processing — is any signal processing conducted on analog signals by analog means. Analog indicates something that is mathematically represented as a set of continuous values. This differs from digital which uses a series of discrete quantities to represent… …
26Radar signal characteristics — A Radar System uses a Radio Frequency electromagnetic signal reflected from a target to determine information about that target. In any radar system, the signal transmitted and received will exhibit many of the characteristics described below.The …
27Railway semaphore signal — One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted arm . Semaphore signals were patented in the early 1840s by… …
28International maritime signal flags — The set of signal flags on the bridge of the Liberty ship SS Jeremiah O Brien The system of international maritime signal flags is one system of flag signals representing individual letters of the alphabet in signals to or from ships. It is a… …
29Digital signal — Main article: Signal (electronics) A digital signal is a physical signal that is a representation of a sequence of discrete values (a quantified discrete time signal), for example of an arbitrary bit stream, or of a digitized (sampled and analog… …
30Time signal — These automatic signal clocks were synchronized by telegraphy in 1905 before the widespread use of radio A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Contents 1 Audible… …
