论坛站务软件水平考试华为认证计算机等级PMP认证思科认证Photoshop3DMAX编程语言移动开发系统运维产品运营淘宝营销办公软件Ps修图云计算大数据摄影就业

<p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　为帮助考生备考2022年软考<span style="margin: 0px; padding: 0px; box-sizing: border-box; color: rgb(255, 0, 0);"><span style="margin: 0px; padding: 0px; box-sizing: border-box; font-weight: 700;"><a href="http://www.kokojia.com/package-203.html" target="_blank" style="margin: 0px; padding: 0px; box-sizing: border-box; cursor: pointer; text-decoration-line: none; color: rgb(51, 122, 183); background-color: transparent;"><span style="margin: 0px; padding: 0px; box-sizing: border-box; color: rgb(255, 0, 0);">网络工程师考试</span></a></span></span>，课课家小编为大家整理了2022年网络工程师考试知识点(十八)：PCM。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　很多考生在备考2022年网络工程师考试，课课家小编为大家整理了2022年网络工程师考试知识点(十八)：PCM，供考生备考复习。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　模拟数据必须转变为数字信号，才能在数字信道上传送，这个过程称为“数字化”。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　取样：尼奎斯特取样定理：如果取样速率大于模拟信号最高频率的2倍，则可以用得到的样本中恢复原来的模拟信号。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　量化：量化，就是把经过抽样得到的瞬时值将其幅度离散，离散值的个数决定了量化的精度。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　编码：将量化后的离散值变成相应的二进制代码</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">　　例如对声音数字化的时候，由于话音的最高频率为4kHz，所以取样频率是8kHz。对话音样本量化用128个等级，因而每个样本用7位二进制数字来表示。在数字信道传送这种数字化的话音信号的速率为7*8000=56Kbps。</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; line-height: 26px; color: rgb(51, 51, 51); white-space: normal; box-sizing: border-box; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255);">　　&gt;&gt;&gt;&gt;&gt;&gt;点击进入<span style="margin: 0px; padding: 0px; box-sizing: border-box; color: rgb(255, 0, 0);"><span style="margin: 0px; padding: 0px; box-sizing: border-box; font-weight: 700;"><a href="http://www.kokojia.com/activity-ruankao.html" target="_blank" style="margin: 0px; padding: 0px; cursor: pointer; text-decoration-line: none; color: rgb(51, 122, 183); box-sizing: border-box; background-color: transparent;"><span style="margin: 0px; padding: 0px; box-sizing: border-box; color: rgb(255, 0, 0);">软考报名专题</span></a></span></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; line-height: 26px; color: rgb(51, 51, 51); white-space: normal; box-sizing: border-box; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255);">&nbsp;</p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; line-height: 26px; color: rgb(51, 51, 51); white-space: normal; box-sizing: border-box; font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; box-sizing: border-box; color: rgb(255, 0, 0);"><span style="margin: 0px; padding: 0px; box-sizing: border-box; font-weight: 700;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="margin: 0px; padding: 0px; box-sizing: border-box;">　　相关推荐：<a href="http://bbs.kokojia.com/ruankao/89368/" target="_blank" style="margin: 0px; padding: 0px; cursor: pointer; color: rgb(0, 174, 239);">2022年网络工程师考试知识点汇总</a></span></span></span></span></span></span></span></span></span></span></span></span></p><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><br/></p>

论坛站务软件水平考试华为认证计算机等级PMP认证思科认证Photoshop3DMAX编程语言移动开发系统运维产品运营淘宝营销办公软件Ps修图云计算大数据摄影就业