分谐波与音质

Sub-harmonies and Sound Quality

我们对乐器进行频谱分析发现,分谐波现象是一个普遍的现象,特别是在音头部分。扬声器中分谐波失真早已是人们已知的事。本文首先描述了这种非线性现象,利用计算机合成含有这种分谐波的信号和对实际乐器的演奏进行主观试听。我们的结论是:对扬声器而言,分谐波是一种失真,它的影响甚至比高次谐波要严重,破坏了重放声的音质;对乐器而言,分谐波的出现在大部分情况下表现了乐器本身的音色,并在动态中加强了乐器的某些表现能力。

After spectrum analyses of some musical instruments it is discovered that the subharmonics is a general phenomenon in musical instruments especially at the beginnings of tones. It has been already known that subharmonics does exist in loudspeakers. This kind of non-linear phenomenon and listening tests with tones possessing subharmonics both synthesized by a computer and played by actual instruments are described in the paper. It is concluded that to loudspeakers, subharmonics is a kind of distortion which can affect even destroy the sound quality more seriously than harmonics whereas to musical instruments, in most cases subharmonics re-flects the timbre of the instruments themselves and reinforces their acting ability in dynamic state.