A 波形 is a 图表 表示法 of the 变动 of some continuous 信号 with respect to 时间 The 波形 of a 声 represents the changes in air 压力 振幅 that are caused by excitation of the air by for 例如 a 音乐 乐器

It should be understood that this is 不 the only way in which a 声 may be 定义 A 波形 represents the 信号 as it changes with 时间 - it is a 'time-domain' 表示法 The 声 can also be represented in the 'frequency domain' this is known as the 频谱 of the 声 giving a picture of the 音色 of the 声 A 数 of sophisticated 分析 技术 have been 发展 many requiring the 使用 of a 计算机 which can convert 'transform' the 表示法 of a 信号 from the 时间 域（范围） to the 频率 域（范围） and vice versa the 'inverse transform' 音乐家 interested in 声 合成 need to 理解 both representations as they need to know the 细节 of the 频谱 of the 波形 that are being used in the 合成 过程 源 - Richard Dobson 1992 A 词典 of 电子 and 计算机 音乐 技术 牛津 University Press