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== 在电子信号与信息系统中 == *在[[数字电路|-{zh-tw:數位;zh-hk:數碼;zh-cn:数字;}-電路]]中,不使用[[精确]]的[[电压]]值来代表[[信号 (信息论)|信号]]的值,只使用0和1两个值。1表示高于预先规定的[[阈值]]电压,被称为[[高电平]]或者[[布尔逻辑#.E7.9C.9F.E5.80.BC.E8.A1.A8|逻辑1]]。与之对应,[[0]]表示低于预先规定的阈值[[电压]],被称为[[低电平]]或者[[布尔逻辑#.E7.9C.9F.E5.80.BC.E8.A1.A8|逻辑0]]。 *於[[JavaScript]]裡,1代表[[布林值]]<code>true</code>。 *在[[雙音多頻]]信號的電話系統中,按鍵1是由1209[[赫茲]]([[高頻]])和697赫茲([[低頻]])的[[正弦信號]]所組成。
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