A voltage comparator can convert analog signals into digital signals. A: Correct B: Wrong

For nonuniform quantizer, such as μ-law and A-law, the SNR for low-level signals increases at the expense of the SNR for high-level signals.

A sensor is a kind of device which can convert electrical signals into excitation signals. A: Correct B: Wrong

There are many ways to receive television signals. What is the latest way to receive television signals in the passage A: Cable network. B: Satellite dish antennas. C: Electrons. D: Wires.

The following statements about the sampling is incorrect. （ ） A: Sampling is a bridge between continuous-time signals and discrete-time signals. B: Sampling is a bridge between continuous-time system and discrete-time system. C: Sampling is a bridge between discrete-time signals and discrete-time system. D: Sampling is a bridge between the various analytical tools of the continuous-time version and discrete-time version.

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

what is a digital signal? () A: discrete signals B: continuous signals C: both of a and b D: signals exist in the world

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

87. what-does the acronym "EOS" indicate in the received message? A: Error of sequence. B: End of sequence. C: End of signals. D: Equal operating signals.

Even a mighty express train can be _____ by signals.