Chapter 9 Communications Circuits 9.9. 4 Attenuation distortion Attenuation distortion occurs because the signal does not attenuate evenly across its frequency rangee 9.9.5 Envelop Delay distortion Envelop delay distortion is an electrical henomenon that occurs when not all frequencies propagate down a communications circuit at exactly the same speed. www.gxmu.edu.cn9.9.4 Attenuation Distortion Attenuation distortion occurs because the signal does not attenuate evenly across its frequency range. 9.9.5 Envelop Delay Distortion Envelop delay distortion is an electrical phenomenon that occurs when not all frequencies propagate down a communications circuit at exactly the same speed. www.gxmu.edu.cn Chapter 9 Communications Circuits