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(2)量化噪声是在量化过程中产生的,为了减小量化噪声,可增加量化电平的数目,减小量化间隔。模拟信号数字化的最后一步是编码,编码就是把取样、量化后的离散脉冲信号按照一定的对应关系转换成一系列数字编码脉冲的过程。量化后的离散脉冲电平是用十进制表示的,必须变换成二进制量化电平。即把信号波形变为一组一组的电脉冲(每个脉冲只有两个电平,即0和1)。4.数字信号的主要参数数字信号的主要参数如下。
(2) quantization noise is generated in the quantization process, in order to reduce the quantization noise, you can increase the number of quantization levels, reducing the quantization interval. The last step of digitalization of analog signal is coding. The coding is the process of converting a sampled and quantized discrete pulse signal into a series of digitally coded pulses according to a certain correspondence. The quantized discrete pulse level is expressed in decimal and must be converted to a binary quantization level. That the signal waveform into a group of electrical pulses (each pulse has only two levels, that is, 0 and 1). 4. The main parameters of digital signals The main parameters of digital signals are as follows.