几乎所有的扬声器的相移，传播失真和瞬态响应不佳都是可以测量到和听到的。
Phase shifts, propagation distortion and poor transient response were measurable and audible with virtually all loudspeakers.
他们的主要问题是传输过程中会产生噪声和失真的积累，由电波多径传播会产生衰落，会严重影响音频的传输质量。
Their main problem is the transmission will be the accumulation of noise and distortion from the spread of multi-path waves will decline would adversely affect the quality of audio transmission.
为了克服由多径传播造成的相移失真难题(特别是在HF链路里)，调制采用差分相移键控(DPSK)来完成。
To cope with the problem of phase shifts caused by different propagation paths (especially in HF links), the modulation is done in differential phase shift keying (DPSK).
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