error box错误框errorn.错误；过失；误差；谬误error of fall points落点偏差error-sum function误差和函数error signal decoder误差信号解码器error-control code误差控制码error in observation观测误差Error - correction误差修正error-rate damping[电] 差率阻尼error discretization误差离散性error-free control无差错控制error data direction差错数据流向