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 声波 represents the changes in air 压力 振幅 that are caused by excitation of the air by for 例如 a 樂/乐 乐器

It should be understood that this is 不 the only way in which a 声波 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 声波 can also be represented in the 'frequency domain' this is known as the 频谱 of the 声波 giving a picture of the 音色 of the 声波 A 数 of sophisticated 分析 技术 have been 发展 many requiring the 用 of a 算機/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 声波 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 字典 of 电子 and 算機/计算机 樂/乐 技术 牛津 University Press