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

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

数字量输出信号是（ ） A: Digital Input B: Digital Output C: Analog Output

为了获取数字传感器的信号，应将“创建通道”函数设置为（ ）。 A: Digital Input B: Digital Output C: Analog Input D: Analog Output

Data can be generally divided into analog data and digital data.

4. What are the advantages of digital signals, comparedwith analog signals?

The A/D converter is used to convert the analog signals to digital signals. For an 8-bit A/D converter with a conversion speed of 1 ms and an analog input range of 0-5V, if a 3.3V analog signal is inputted, the digital signal output should be: A: 168 B: 3.3 C: 168.9 D: 3

An optical cable is used to transmit：（） A: digital audio from a component to a receiver. B: analog video from a component to a receiver. C: analog audio from a component to a receiver. D: digital video from a component to a receiver.

为了获取数字传感器的信号，应将“创建通道”函数[img=31x34]1802e9381b245e8.jpg[/img]设置为( )。 A: Digital Input B: Digital Output C: Analog Input D: Analog Output