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　Why is digital that can communicate accurately than analog?
　Analog data contains the noise in the waveform itself.Namely Noise is that it becomes difficult to remove.Digital data contains the noise in the waveform itself at one and zero."1" is become to "0.8" or "0.9" but that if "1"."0" is become to "0.1" or "0.2" but that if "0".And digital signals are not affected by noise that it can convey the correct information.
　Is Analog technology needed?

　In today's analog technique industry is very important.But it seems unnecessary.Vehicle control and various things, there are many things that cann't processed digitally.Some of the benefits of converting to digital should to go digital.It can not move, but not all digital.
　Why is the degradation of analogue?
　Analog will deteriorate and so susceptible to external noise.When recording music pick up sounds from fluorescent lamps and power.So it go in noise and would lead to degradation.
　Benefits only to a digital?
　It is advantage nearly.But the digital signal is limited when dealing with standards of quantization precision,it can not reduce the errorand digital signal processing circuit is complicated are disadvantage.
　Are there any advantages to analog?
　You can reduce the error in giving an accurate analog signal handling equipment.And circuit analog signal handling is simple.