1. Audio waves can be converted to digital form by an ADC (Analog Digital Converter). An ADC takes an electrical voltage as input and generates a binary number as output. 
   声波可以通过adc（模拟数字转换器）转换到数字形式，adc采用电压作为输入并产生二进制数作为输出。
2. An audio(sound)　wave is a one-dimensional acoustic(pressure) wave. When an acoustic wave enters the ear， the eardrum vibrates， causing the tiny bones of the inner ear to vibrate along with it， and sending nerve pulses to the brain. These pluses are perceived as sound by the listener. Audio waves can be converted to digital form by an ADC (Analog Digital Converter). An ADC takes an electrical voltage as input and generates a binary number as output. Music， of course，is just a special case of general audio，but an important one. The representation， processing，storage, and transmission of such audio signals are a major part of the study of multimedia systems. 
   声波是一维的声学(气压)波，当声波进入人的耳朵时，耳膜振动，引起耳朵内部的一些小骨头振动，并向大脑发出神经脉冲，这些脉冲被听者作为声音听到了。声波可以通过adc(模拟数字转换器)转换到数字形式，adc采用电压作为输入并产生二进制数作为输出。当然，音乐是声波的一种特殊情况，但却是重要的一种。这些音频信号的表达、处理、存储和转换是多媒体系统研究的主要部分。

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