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名词解释题
modulation调制
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单选题目前被广泛采用的ADSL调制技术有3种:QAM(quadature ampli-tude modulation)、CAP(carrierless amplitude-phase modulation)、DMT(discrete multitone),其中()调制技术被ANSI标准化小组T1E1.4制订的国家标准所采用。A
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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.
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单选题下列关于MTF(调制传递函数)的概念理解,错误的是()A
MTF指输入信息量与记录信息量之比B
MTF的英文全称为modulation-transfer-functionC
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MTF是国际上通用的X线影像质量评价方法E
MTF能够客观评价信息传递时信息失真的情况
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单选题广义的调制分为()。A
基带调制和带通调制B
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基带调制和通带调制
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