Which is the modulation and demodulation technology mainly used among the following communication modes? A: Analog channel transmits digital data B: Analog channel transmit analog data C: Digital channel transmit digital data D: Digital channel transmit analog data

Generally speaking, digital transmission can get higher signal quality than analog transmission, because? A: The repeater can regenerate digital pulses to remove signal distortion, and the amplifier amplifies the analog signal as well as the analog signal distorted B: Digital signals are smaller than analog signals and are not prone to distortion C: Analog signals are continuous and are not prone to distortion D: Digital signal is easier to sample than analog signal

The bilinear transformation that directly maps the analog low-pass filter to a digital high-pass filter is [img=102x47]17de859f621abed.png[/img].

数字模拟转换器的英语全称是( ). A: Central Processing Unit B: Analog Digital Converter C: Basic Revolution Unit D: Digital Analog Converter

To design a digital low-pass filter using the bilinear transformation method and analog low-pass filter, assuming that the cut-off frequency of the analog low-pass filter is [img=134x25]1803a1d911e6cbe.png[/img] and the bilinear transformation parameter [img=82x19]1803a1d91a05bd3.png[/img] is selected, the cut-off frequency [img=17x17]1803a1d922ed622.png[/img] of the resulting digital filter is ( ). A: [img=109x25]1803a1d92a87228.png[/img] B: [img=85x25]1803a1d9330f7ad.png[/img] C: [img=74x25]1803a1d93bdee3e.png[/img] D: [img=98x25]1803a1d9443158c.png[/img]