31 Digital Signals (cont.) Example [ approximation of digital signal’s spectrum using 1stharmonic ] 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] 2nB
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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 _______________. 3. In a time-domain plot, the vertical axis measures the _______________. 4. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what