[¦ȯd·ə¦mad·ik ¦vid·ē·ȯ ′nȯiz ‚lev·əl·iŋ] (electronics) Constant false-alarm rate scheme in which the video noise level at the output of the receiver is sampled at the end of each range sweep and the receiver gain is readjusted accordingly to maintain a constant video noise level at the output.