In Schaeffer's description of his 听觉训练 the first stage of the programme of 音乐 研究 类型学 is a procedure to identify and classify 声音 对象 which should be able to encompass the whole 范围（排列） of 可能 声音 识别 is a procedure which consists in isolating cutting out 声音 对象 from every 可能 声音 语义（上下文） 分类法 is a procedure which consists of arranging them in families in different 种类 In his Traité des objets musicaux he defines about thirty 种类 of 对象 Paraphrase of Michel Chion 1983 Guide des Objets Sonores Eds Buchet/Chastel Paris 1995 translation by John Dack/Christine North