CPE12 - Midterm Exam

What is the primary goal of digital communications?

• To reduce the bandwidth of the signal

• To transmit analog signals over long distances

• To convert information into a digital signal for transmission

• To modulate signals for noise reduction

In digital communication, the data to be transmitted is typically represented by:

• Analog waveforms

• Discrete signals

• Continuous signals

• None of the above

Which of the following is an example of a baseband signal?

• A high-frequency sine wave

• A pulse code modulated signal

• A frequency-modulated signal

• A continuous sinusoidal wave

In the context of digital communications, what is a codec used for?

• Amplifying the signal

• Encoding and decoding digital data

• Modulating signals for transmission

• Filtering the signal for noise removal

What does the term 'bitrate' refer to in digital communications?

• The frequency of the transmitted signal

• The amount of information transmitted per second

• The number of bits required for error correction

• The modulation type used in transmission

The sampling theorem in digital communication is important for:

• Analog signal generation

• Decoding digital data

• Converting analog signals to digital form

• Modulating a digital signal

Which of the following is true for digital communication systems?

• They require higher power than analog systems

• They are immune to noise

• They offer higher efficiency in transmission over long distances

• They only support voice signals

Which of the following is NOT a characteristic of digital transmission?

• Discrete signals

• High susceptibility to noise

• Error correction techniques

• Reduced distortion in the transmitted signal

The process of converting digital data into signals suitable for transmission is called:

• Sampling

• Modulation

• Quantization

• Encoding

In digital modulation, what does the term 'modulation' refer to?

• Changing the carrier frequency

• Changing the amplitude, frequency, or phase of the carrier signal

• Converting analog signals to digital

• Encoding the message in binary format