The 声音 事件 like the 声音 对象 is 定义 by the 人类 耳 as the smallest self-contained particle of a 声音景观(声景) It differs from the 声音 对象 in that the latter is an 抽象 声学 对象 for 研究 while the 声音 事件 is a symbolic 语义 or 结构 对象 for 研究 and is therefore a nonabstractable point of reference 相关 to a whole of greater magnitude than itself 源 R Murray Schafer 1977 The 调音系统 of the World New York Knopf