12 Questions
What is the primary focus of digital modulation in electronic communications?
Varying carrier parameters based on information signal
Which type of modulation is used when both amplitude and phase are varied proportional to the information signal?
QAM
What does a high information capacity indicate in a communications system?
Efficient use of bandwidth
In digital communications, what is a bit rate a measure of?
Number of bits transmitted per second
Which law states that information capacity is directly proportional to bandwidth and transmission time?
Hartley’s Law
What is the Shannon limit for information capacity dependent on in a communications system?
Signal-to-noise power ratio
What does M-ary encoding in digital modulation represent?
Number of conditions or combinations possible for a given number of binary variables
What does the term 'Baud' refer to in digital modulation?
Rate of change of a signal on the transmission medium after encoding and modulation
In digital modulation, what is a signaling element typically represented by?
A symbol encoded as a change in amplitude, frequency, or phase
What does the Nyquist Formula for Channel Capacity state?
The highest theoretical bit rate for a given bandwidth is 2B
How does the capacity to propagate data change when more than two levels are used for signaling in digital modulation?
It is possible to propagate a bit rate exceeding 2B
Which statement about Baud and bits per second relationship in higher-level systems is true?
bps is always greater than baud
Test your knowledge about digital communication, digital modulation, and electronic communications. Explore topics such as transmission, reception, processing of information, and digital radio.
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