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Questions and Answers
What is the purpose of using two copies of the carrier signals, each shifted by 90°, in a combination of ASK and PSK?
What is the purpose of using two copies of the carrier signals, each shifted by 90°, in a combination of ASK and PSK?
- To send two different signals simultaneously on the same carrier frequency (correct)
- To decrease the signal strength of the transmitted signal
- To make the demodulation process simpler
- To increase the bandwidth of the composite signal
In digitizing analog data, what is the function of a codec (coder-decoder)?
In digitizing analog data, what is the function of a codec (coder-decoder)?
- To increase the bandwidth of the signal
- To convert analog samples into binary codes (correct)
- To sample the analog data at regular intervals
- To shift the analog signal by 90°
What is the significance of sampling at a rate higher than twice the highest signal frequency according to the Sampling Theorem?
What is the significance of sampling at a rate higher than twice the highest signal frequency according to the Sampling Theorem?
- Samples distort the original signal
- Samples reduce the quality of the analog signal
- Samples contain all the information of the original signal (correct)
- Samples become irrelevant for conversion
In Pulse Code Modulation (PCM), what does the term '8000 samples per second' refer to?
In Pulse Code Modulation (PCM), what does the term '8000 samples per second' refer to?
What is the key difference between ASK and PSK in terms of modulating a carrier signal?
What is the key difference between ASK and PSK in terms of modulating a carrier signal?
What is required to convert digital data into an analog signal?
What is required to convert digital data into an analog signal?
Which technique is used for converting analog data into digital signals?
Which technique is used for converting analog data into digital signals?
Which type of modulation involves changing the amplitude of a carrier signal?
Which type of modulation involves changing the amplitude of a carrier signal?
What is the process of sending multiple signals over a single complex signal called?
What is the process of sending multiple signals over a single complex signal called?
Which of the following is not a basic technique for modulating analog data with a carrier frequency?
Which of the following is not a basic technique for modulating analog data with a carrier frequency?
Which type of signal can be represented using sine waves?
Which type of signal can be represented using sine waves?
What is the process of recovering separate signals from a single complex signal called?
What is the process of recovering separate signals from a single complex signal called?
What type of signals are used in optical systems and unguided media?
What type of signals are used in optical systems and unguided media?
Which encoding method is used to transmit binary data?
Which encoding method is used to transmit binary data?
What is the main advantage of converting analog data into digital form?
What is the main advantage of converting analog data into digital form?
Which modulation technique is used to transmit voice signals over telephone lines?
Which modulation technique is used to transmit voice signals over telephone lines?
What is the bandwidth of a composite signal composed of two signals with bandwidths B1 and B2?
What is the bandwidth of a composite signal composed of two signals with bandwidths B1 and B2?
What is the main difference between periodic and nonperiodic signals?
What is the main difference between periodic and nonperiodic signals?
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