In 樂/乐 this 术语 提及 to an 效果（效应） 产生 by having an 电子 or 模拟 电路 in which an 输出 信号 is somehow 连接 to the 输入 信号 For 例如 this can take place when a 声筒（麦克风） feeds back through 扬声器 in its 近 when a 信号 played back on an 模拟 磁带 is used as part of the 输入 for the newly 录制 声波 In 人工 智能 回授（反馈） can also refer to 行为 修正 in which 信息 接收 can influence 未来 决定