An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Information transmitted by means of a modulated current or an electromagnetic wave and received by telephone, radio, television, etc.

→ electromagnetic; → signal.

A signal in the → radio frequency region of the → electromagnetic spectrum.

→ radio; → signal.

In radar, a signal whose amplitude is greater than the dynamic range of the receiving system.

→ saturation; → signal.

1) Useful part of the received information that can be distinguished from noise.
2) Information transmitted by means of a modulated current or an electromagnetic wave and received by telephone, radio, television, etc.

M.E., from O.Fr. signal, from M.L. signale "a signal," from L.L. signalis (adj.) "used as a signal, pertaining to a sign," from L. signum "signal, sign."

Nešâl, from neš- base of nešân meaning → sign + -âl, → -al.

Concept used to quantify the effects of noise. It is the ratio of a signal to the standard deviation of the signal.

→ signal; → noise; → ratio.

The minimum intensity of a signal that can be detected and recognized.

→ threshold; → signal.