名词解释题modulation调制
名词解释题
modulation调制
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多选题Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）AThe three required steps in the analog to digital conversion are sampling，encoding，and compression.BThe three required steps in the analog to digital conversion are sampling，quantization，and compression.CThe three required steps in the analog to digital conversion are sampling，quantization，and encoding.DThe output of the sampling process is a pulse code modulation （PCM） signal.EThe output of the sampling process is a pulse amplitude modulation （PAM） signal.
单选题下列关于MTF（调制传递函数）的概念理解，错误的是（）AMTF指输入信息量与记录信息量之比BMTF的英文全称为modulation-transfer-functionCMTF把以时间为自变量的函数通过傅立叶变换为以空间频率为变量的函数DMTF是国际上通用的X线影像质量评价方法EMTF能够客观评价信息传递时信息失真的情况
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