The 过程 of producing an 增加 in the 能量 of a 声音 or an 音频 信号 This may be accomplished by 手段(意味着) of an 电子 放大器 or by 手段(意味着) of an acoustic resonator such as the 声音 box of a 音乐 乐器 an ear-trumpet etc Attaching i e coupling a 颤 对象 to another 表面 such as a soundboard wall or floor will result in a more efficient 转移 of 能量 and hence this 过程 may also be termed 扩声 扩声 or 增益 may be 测量 in 分贝 源 Barry Truax - Handbook for Acoustic 生态学 CD-ROM Edition Cambridge Street 出版 1999 - CSR-CDR 9901