CSE3213_04_AnalogDigitalSignalsW2012 part 7

CSE3213_04_AnalogDigitalSignalsW2012 part 7 - is the...

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31 Digital Signals (cont.) Example [ approximation of digital signal’s spectrum using 1 st harmonic ] Assume our computer generates 6 bps. Possibilities (periodic combinations) : 000000, 111111, 110011, 101010 etc. 1. Best case: min # of changes min freq. of substitute analog signal 2. Worst case – max # of changes max freq. of substitute analog signal bit rate: n = 6 [bps] frequency: B = 3 [Hz] 2 n B
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32 Exercise 1. Before data can be transmitted, they must be transformed to _______________. (a) periodic signals (b) electromagnetic signals (c) aperiodic signals (d) low-frequency sinewaves 2. In a frequency-domain plot, the vertical axis measures the _______________. (a) peak amplitude (b) frequency (c) phase (d) slope 3. In a time-domain plot, the vertical axis measures the _______________. (a) peak amplitude (b) amplitude (c) frequency (d) time 4. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what
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Unformatted text preview: is the highest frequency _______________. (a) 5 KHz (b) 10 KHz (c) 47 KHz (d) 57 KHz 33 Exercise 5. If one of the components of a signal has a frequency of zero, the average amplitude of the signal _______________. (a) is greater than zero (b) is less than zero (c) is zero (d) (a) or (b) 6. Give two sinewaves A and B, if the frequency of A is twice that of B, then the period of B is ________________ that of A. (a) one-half (b) twice (c) the same as (d) indeterminate from 7. A device is sending out data at the rate of 1000 bps. (a) How long does it take to send out 10 bits? (b) How long does it take to send out a single character (8 bits)? (c) How long does it take to send a file of 100,000 characters? 34 Power over Ethernet http://www.chippc.com/support/downloads/files/PoE_and_IEEE802_3af.pdf...
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CSE3213_04_AnalogDigitalSignalsW2012 part 7 - is the...

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