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
A: Analog channel transmits digital data
B: Analog channel transmit analog data
C: Digital channel transmit digital data
D: Digital channel transmit analog data
举一反三
- Data can be generally divided into analog data and digital data.
- Modem is only used to convert digital signals into analog signals and transmit them on the line.
- 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.
- Modem is only used to convert digital signals into analog signals and transmit them on the line. A: 正确 B: 错误
- 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