简述对话音信号采用均匀量化时存在的缺点和解决方法。
(1)均匀量化时,无论信号大小,量化噪声功率总是不变,故小信号时量化信噪比也小,达不到电话传输标准。电话信号动态范围大,若要保证话音质量,需要12位量化编码,从而导致带宽增加,编码设备复杂。(2)解决方案是:采用非均匀量化。
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如图所示,质量为m、的均质等边三角形薄板,可绕垂直于板面的光滑水平轴O作定轴转动。已知三角板对过其质心C且垂直于板面的轴的回转半径为The following passage is incomplete with one body paragraph missing. Study the passage carefully and write the missing paragraph in about 100 words. Make sure that your tone and diction are in unity with the passage provided.