The profile of the 演变 of the 强度 and/or 频谱 of a 声波 during its 时值 Other uses of the 术语 concern 频率 and 滤器 演变 in 时间 primarily on 合成器

EARS2
The 形状 of a 声波 over 时间 It can be 描述 by using the 术语 起衰延消 起(始) 衰(减) 延(续) 消(去)/释放


包络 The profile of the 演变 of the 强度 and/or 频谱 of a 声波 during its 时值 [EARS] Those who 用 合成器 or software-based 系统 will be acquainted with the 术语 that are often 相关 to an envelope's 设计 起(始) 衰(减) 延(续) 消(去)/释放 or 起衰延消