The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( )
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- 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
- When a digital signal is transmitted in an analog transmission system, what are required at the transmitting and the receiving ends respectively? A: Modulator and Demodulator B: Demodulator and Modulator C: Encoder and decoder D: Decoder and encoder
- The transmission of 3.6 Tbit/s signal on 120km fiber lines has been successfully achieved in the laboratory.
- what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
- Among the following four transmission media, which has the widest bandwidth, the smallest signal transmission attenuation and the strongest anti-interference capability? A: Twisted pair B: Coaxial cable C: Optical fiber D: Microwave