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
A: Modulator and Demodulator
B: Demodulator and Modulator
C: Encoder and decoder
D: Decoder and encoder
举一反三
- The 74138 decoder can also be used as ( ). A: an encoder B: a DEMUX C: a MUX D: none of the above
- 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
- （）是Modulator(调制器)与Demodulator(解调器)的简称，中文称为调制解调器(港台称之为数据机)，根据Modem的谐音，亲昵地称之为"（）"。
- 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
- Video encoder is also called video server, or DVS (Digital Video Server) for short. It is mainly used to encode and compress analog video signals and provide network transmission function. The difference with DVR products is that DVS focuses on the "video recording" function. ( )