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Unformatted text preview: 1 CHAPTER 3 Data and Signals Solutions to Review Questions and Exercises Review Questions 1. Frequency and period are the inverse of each other. T = 1/ f and f = 1/T. 2. The amplitude of a signal measures the value of the signal at any point. The fre- quency of a signal refers to the number of periods in one second. The phase describes the position of the waveform relative to time zero. 3. Using Fourier analysis. Fourier series gives the frequency domain of a periodic signal; Fourier analysis gives the frequency domain of a nonperiodic signal. 4. Three types of transmission impairment are attenuation , distortion , and noise . 5. Baseband transmission means sending a digital or an analog signal without modu- lation using a low-pass channel. Broadband transmission means modulating a digital or an analog signal using a band-pass channel. 6. A low-pass channel has a bandwidth starting from zero; a band-pass channel has a bandwidth that does not start from zero. 7. The Nyquist theorem defines the maximum bit rate of a noiseless channel. 8. The Shannon capacity determines the theoretical maximum bit rate of a noisy channel. 9. Optical signals have very high frequencies. A high frequency means a short wave length because the wave length is inversely proportional to the frequency ( λ = v/f), where v is the propagation speed in the media. 10. A signal is periodic if its frequency domain plot is discrete ; a signal is nonperi- odic if its frequency domain plot is continuous . 11. The frequency domain of a voice signal is normally continuous because voice is a nonperiodic signal....
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- Spring '08
- Hertz, Wavelength, Bit rate