在串列存儲延遲線中，計算機字通過某指定點的一種時間度量。該字的所有位必須通過輸入控制門，拍則是所有位時間之和。A time measurement for a given computer word to pass a given point as in serial storage delay-lines. All of the bits of a word must pass through the input control gate; the beat is then the sum of all the bits times.